wide variety of special alloys for corrosion resistance of stainless steels have been developed to call Among the excellent properties of these alloys excellent ductility, high toughness at room temperature and low temperature and good resistance to oxidation and creep at high temperatures is scaling up to high temperatures retain their properties Stainless steels, alloy steels contain significant quantities of cream are among the categories Conventional creams least element in this category is 11% for the ferrous alloys of steel have stainless properties of the cream should not be less than this amount

Stainless steel

Wide variety of special alloys for corrosion resistance

of stainless steels have been developed to call Among the excellent properties of these alloys excellent ductility, high toughness at room temperature and low temperature and good resistance to oxidation and creep at high temperatures is scaling up to high temperatures retain their properties Stainless steels, alloy steels contain significant quantities of cream are among the categories Conventional creams least element in this category is 11% for the ferrous alloys of steel have stainless properties of the cream should

not be less than this amount

chromium element is causing a stainless steel property have meaning that resistance to corrosion in the improved. So chromium element of improving resistance to corrosion alloy steels don't call that the improvement of resistance to corrosion in terms of forming a protective oxide layer of chromium on the surface of the stainless steel plate , the film is under conditions of the steel in times of and corrosive environment protection complaints In addition to the chromium, other chemicals are used in combination stainless steel and nickel, among which we can mention Nickel is mainly to provide flexibility in the form of stainless steel makes .Stainless steel hardware-based group of rolling is said to contain at least 11% chromium (Cr) .Chromium is an essential element that formed a chromium oxide film on the surface of stainless steel it makes. When stainless steel is cut or scratched, chromium oxide and oxide film on the surface immediately repair the damaged area. Because of this self-healing properties (Self healing), which is rust-free steel (Stainless) called The first stainless steel alloyed, martensitic Fe-Cr-C by the English scientist named Harry Brrly (Harry Brearley) was prepared in 1912. The first commercial stainless steel casting was produced in 1913 in Sheffield, England and the US patent for this invention in 1916 was awarded to Mr. Harry Brrly

Is stainless steel rings

Indeed, the fact that stainless steel does not rust is a misconception. This erroneous interpretation and even prosecute some cases leading to disputes between the employers and contractors. Stainless steels and uncontaminated environment only in special circumstances, such as fresh water or sea water (for now) remain without alarm. In moist air, sea or in standing water (stagnant) type 304 stainless steel rings, and is often pitting developed locally. In general, the nature and chemical composition of stainless steel and corrosion pitting both in stainless steel have a decisive role

What is the clear layer of chromium heat treatment

Heat treatment or welding, stainless steel temperature to about 850-550 ºC. Chrome and carbon react with each other, and do Chromium (Chromium Carbide) is produced which is precipitated along grain boundaries. That's why chromium in the area around the boundary (border zone) is discharged. Border area of depleted chromium (chromium than the poor) than other healthy areas of the surface of the evacuation zones are not chrome it is less resistant to corrosion

Stainless steel ring in the crystal structure of chromium there should be "sensitized (Sensitized) call. Sensitized steels are more susceptible to corrosion, welding corruption

All types of stainless steel are

  Stainless steel Austenitic 300

   Stainless steel Ferritic 400

   Stainless Steel Austenitic-Ferritic Duplex

 stainless steel Martensitic

Martensitic stainless steel*

  For a lot of application that requires not only corrosion resistance but also require high strength, high hardness, resistance to wear and maintain sharp edges and angles in pieces, martensitic steels used steels can be forged first and then with austenitic and rapid cooling (martensite formation) and annealing heat treatment giving a martensitic stainless steel magnetism and ability to achieve variable range of hardness. For the manufacture of steam turbines of this type of steel is used

Austenitic stainless steel - ferritic*

These stainless steels both metallurgical structure of ferrite and austenite phases at the same time on your own so they have also named duplex stainless steels These steels contain nickel element for stabilizing the austenite phase and obtain properties flexibility quantities of chromium in order to stabilize the ferrite phase and gain of strength and good toughness properties are in steel

Application

Petrochemical industry - paper - sugar and sugar cane as well as shipbuilding

Stainless steel ferritic: Series 400 Ferritic*

These stainless steels are magnetic and have good physical and mechanical properties. The major alloying element in this group chromium enough to stabilize the ferrite phase is complete in order to prevent the formation of phases that are destructive in terms of flexibility and toughness Fast cooling This type of steel that contains a higher percentage of alloying elements are required. Ferritic stainless steels have properties similar to carbon steel with the difference that resistance to corrosion is far better. These steels contain chromium, generally between 12 to 17 percent in its structure, which amounts to about 12% chromium steels for use in the structure and values of approximately 17% chromium steels, boiler - Washing machines - interior decoration and household appliances used

Austenitic stainless steel: Austenitic 300 series*

Most austenitic stainless steel used in other types of stainless steels and accounted for almost 80% of the world market. Its structure, which is at least 7% nickel steel structure fully austenitic steel has caused flexibility and resistance to the use of high oc, non-magnetic and self demonstrate favorable weld ability .The main characteristic of this class of stainless steels, ease of welding and corrosion resistance and non-magnetic cold Awesome soft and flexible to work for them. According to what was mentioned, stainless steels for use in atmospheric environment, water and a variety of chemical environments of their choice. But, depending on the type of environment, should the chemical composition of steel to be used. Except for resistance to certain corrosive environments, austenitic stainless steels metallurgical properties

(A) convert the austenite to martensite by cold working in a variety of 301, 302 and 304

  (B) To exclude the possibility of formation of carbon and chromium alloy element chromium and prevent intergranular corrosion in a variety of 304L, 316L, 321,347

  (C) types of alloys to increase resistance to corrosion hole 316

  (D) the use of higher levels of alloying elements chromium and nickel to increase strength at high temperature (steel products) and resistance to scaling types 309 and 310 as well

Application

Tanks for storage of chemicals - Kitchen - Industrial pipes-External facade of buildings - structure

The main groups

Do not steel (non-magnetic): cast iron - carbon Cr-Ni less than 1.0% (inclusive of 1.4301 / 304, commonly known as 8/18 and 10/18.) The property is not in working nonferrous kidnapping and more than 65% of global steel consumption is accounted for.

Catch steel (magnetic) iron alloy - chrome with a carbon less than 0.1% and magnets.

Martensite steel: iron - chromium high-carbon and 01% are magnetic and hardness.

Duplex stainless steel alloy iron - chromium and nickel construction with a combination of magnetic and non-magnetic and magnetic steel

 

Home Properties

Corrosion-resistant - high performance - heat-resistant - low cost during the service life 100% recyclable - biologically neutral - high strength-to-weight ratio

?Catch a variety of steel (magnetic) What

The most widely used is 1.4016. The use of alloys with low chromium in cases where appearance is not a priority and harsh environmental conditions is not available, it is possible to increase the chromium and molybdenum increase corrosion resistance. Titanium and niobium enhance the weldability also increases property

 

?What duplex

Overall duplex stainless steel in terms of mechanical strength at a higher level than conventional types of Catch steel (magnetic) and do not (non-magnetic) are located. 1.4462 is the most widely used type of steel that is schematically.

 

Introduction of stainless steel and their applications

  In general, stainless steel, metal, durable, low cost for maintenance and hundred percent recyclable and more than 60% of new steel melting scrap stainless steel are provided

The main properties of stainless steel are summarized in the following areas:

* Corrosion resistance

 * Attractive appearance

 * Heat resistance

 * Minimal cost over the useful life

 * Fully recyclable

 * The ability to biologically neutral

 * Simplicity product

 

 ?Stainless steel groups are there

 -2 the non-magnetic steel (non-magnetic) steel 1. Catch (magnetic) 3 - martensite steel of 4 - Duplex steel

 

 1. The group of non-magnetic steel non magnetic

  Alloy of iron, carbon, chromium-nickel less than a tenth of a percent are known as 304 and 304L stainless steel, usually as a 8/18 and 10/18 are also named non-magnetic properties are not in work mode. This group of more than 65% of global steel consumption into account.

 

 2- (Catch steel (magnetic

 Iron alloy - chrome with a carbon less than a tenth of a percent and magnets

3- martensite steel

 Iron alloy - chrome with a higher carbon-tenth of a percent and magnets with high hardness

 

 4- duplex steel

  Iron alloy - nickel chrome and steel construction combined magnetic and non-magnetic and has magnets in temperature are normal.

 

 The main properties of steel

 Corrosion-resistant - high performance - heat-resistant - low cost and lifespan, 100% recyclable - biologically neutral - ease of production, and the cleanliness and also above the resistance-to-weight ratio

 

 (Of non-magnetic steel (non-magnetic

 In this type of alloy 304 stainless steel with chromium and nickel compounds 10.8 percent, 20-18 percent and 80/0 percent maximum carbon steel as the base is known. And by changing the composition of the alloy or stainless steel 304 4301/1 achievement of other alloy steel is possible in this group

According to the desired objective when using stainless steel of the following conditions are expected

 First: If improvement is desired mechanical properties, depending on the method chosen one can be chosen from the following groups

  The first group can be increased by increasing the nitrogen in the alloy composition, especially at lower power, and in this group can be 304N or (4315/1) and 304LN or (4311/1) noted

 Group II: With the increase of carbon in the alloy composition, mechanical properties (including cold treatment) rises that can be made of stainless steel type 301 (4310/1) noted

  group III, with a relative reduction of carbon and nitrogen increased 301 stainless steel alloy composition can increase weldability and corrosion resistance properties of non-fragility and increased the example to type (301LN (438/1 can be noted

 Group IV: Nickel increased by as much as 12 percent in the alloy composition can be shaped expander (pull the harness) boosted the type 305 (4303/1) is one of these types

 Second case: If the goal is to increase corrosion resistance and can be made using the base (304) into two groups achieved

 Group A: If oxidation resistance at elevated temperatures is desired that the alloy composition of stainless steel, chrome and nickel are rising, they are the most suited of all kinds 309 S (4833/1) 310 / 314 (4841/1) and 310S (4845/1) noted

 Group B: to increase corrosion resistance can be combined with an increase in molybdenum alloy steel base increased corrosion resistance. 316 (4401/1) with 2% molybdenum and 316 (4436/1) with 5.2% molybdenum and 3% molybdenum, including 317 with this type of steel are

 Third: If you consider the quality of welding can be a variety of conditions expected in the following groups:

 first group

 The relative increase in titanium with carbon and stainless steel can be improved weldability and corrosion inside the beans after boiling can be prevented

 The group consists of 321 series stainless steel (4541/1) contains titanium or series 304 (L (4307/1 and (4306/1) are low-carbon

 The second group with carbon reduction and increased molybdenum and titanium to improve weldability, corrosion resistance can be increased at the same time. 316 TI 4571/1 and 316 L and 317L steel of these are included

 Group III: In this type of steel with increased chromium, molybdenum and nitrogen in stainless steel base (304) increased corrosion resistance and weldability quality will improve. Steel in 4547/1, 4529/1 with 6% molybdenum these are included

(Catch a variety of steel (non-magnetic

 In this group the most widely used type of stainless steel (AISI 430) or is 4016/1. This type of steel in conditions that keep popping up in priority and harsh environmental conditions is not available, are of great importance. Increased chromium and molybdenum in this type of steel increases corrosion resistance and adding titanium and niobium characteristic weldability increase

 Stainless steel magnetic division (Catch)

 first group

 This group includes 409- 410- 420- 410L stainless steel with chromium of between 10 to 14 per cent and 30 per cent of the total consumption of this type of stainless steel is included. The group with the lowest and cheapest type of stainless steel is chrome. Other corrosive or corrosive environments with little or acceptable where a small amount of surface rust consumed. More indoors (when not in direct contact with water or be permanently dry) and also for major consumer car exhaust muffler

 410 L series for use in container - Buses and minibuses and recently applied to the LCD frame

Group II

 Stainless steel type 430 index of this group is that Chrome is between 14 to 18 percent and most widely used stainless steel magnetic type (Catch) are about 48 percent of global consumption of this type of stainless steel due to high levels of chromium (14-18%) have high resistance to corrosion, and very similar to the non-magnetic stainless steel base that is 304. another use of stainless steel in the manufacture of boilers washing machines and interior panels is usually a good alternative to 430 stainless steel non-magnetic stainless 304 and in household items such as dishwashers items, kitchen utensils (pots and pans) is widely used

The third group consists of steel of the same group (14 to 18% Cr) and stabilization elements though, such as titanium, niobium are also active in the composition of the steel of all kinds (430TI-439- 441) can be cited

Compared with Group 2 Catch the series of stainless better weldability and forming capability of the show and in most cases non-magnetic 304 series will develop better behavior The main purpose of this group making sinks, heat exchanger tubes (the sugar industry, energy, etc.) exhaust system with longer life (type 409) and welded parts in washing machines. In the case of consumption of steel by 304 higher than required and non-economic terms seem to take this type of steel are a good alternative

The fourth group consists of steel by 434 436, 444 (molybdenum in combination) to account for 7% of consumption. This group includes some of molybdenum is added to increase corrosion resistance

A common use in the manufacture of hot water tanks, solar water heaters, the outer parts of the exhaust system, electric kettle, microwave oven parts, external panels and so on. 444 series in terms of corrosion resistance can act similar 316 series

The fifth group consists of steel with 30-18% chromium, which can be categorized in other groups. It can be a variety of types 445, 446 447, etc. can be mentioned. This group accounted for 2% of the total consumption of the day

This series has added chrome and molybdenum to enhance the resistance to corrosion and oxidation (eg Type 316) and mainly the series of coastal environments and corrosion in harsh conditions Note the corrosion resistance of titanium metal is equivalent to JIS 447 series

(Magnets advantage of magnetic steel (Catch

  It is expected that the steel has a magnetic hold, so as not real stainless and carbon steel rusts like. This impression is totally wrong It should be noted that only the difference between the atomic structure of some magnetic steel (Catch) and a number of non-magnetic (non-magnetic) are

(Anti-corrosion properties of magnetic steel (Catch

  Stainless steel corrosion-resistant metal because of chromium is sent

All metals against corrosion in a different ratio has dramatically weakness, although stainless steel is corrosion resistant than carbon steels

Metal chromium in stainless steel (not nickel is sometimes imagined) is the main cause of corrosion resistance of the metal. For this reason, magnetic steel (Catch) than chromium in their good resistance to corrosion of the show

Topical resistance to corrosion in steel magnetic

Corrosion resistance of stainless steel depends on its chemical composition and atomic structure type or do not take it. Molybdenum in stainless steel 436 and 444 due to the corrosion resistance of 304 is at a higher level though non-magnetic stainless steel Catch exceeding 304 Series 441, 439, 430 is

Physical and mechanical properties of magnetic steel Catch

  Catch steel is suitable for many different products and applications are broad

Catch steel mechanical properties compared to steel and do not have a proper and acceptable middle position. Do not take the higher yield strength of steel while elongation and ductility properties are similar to carbon steel. These two superior characteristics compared to steel and non-magnetic stainless steel thermal expansion and thermal conductivity it is

(The physical properties of magnetic steel (Catch

   In general, the physical properties of a metallic alloy metal reflects the ability to transfer heat, electricity transmission,

  Expansion and contraction, and so on

Catch steel is magnetized and yet has numerous advantages over the non-magnetic steel are. For example, heat transfer and significantly in their applications, such as electric irons, or pipe or plate heat exchangers are ideal

Catch coefficient of thermal expansion similar to steel, carbon steel and much lower non-magnetic steel and steel Catch resulting in less heat deformation of the day

Magnetic shielding gases for welding steel

  In the case of high chromium stainless steel melting due to high oxidation capability f you are not protected from air during melting of the metal chromium in the metal become oxidized and reduced resistance to corrosion in welds To prevent this, the shielding gas used protective gases argon or helium can be a combination of factors

Catch steel shielding gases should be pure argon direction or argon and helium are combined.

  The most common protective gas argon and nitrogen gas behind the work is not intended to be used in steel Catch

Pickling, neutralization and disinfection

  Slight discoloration resulting from welding should be mechanical or chemical methods (called pickling) will be destroyed. Floedric and nitric acid pickling or by a combination of dough is special

  Neutralization and disinfection operations and release to refresh the surface layer of metallic deposits by immersing the piece in cold water containing 20 to 25 percent nitric acid is obtained

Categories for short magnetic steel (Catch) will be as follows

  First group: Cr 14-10 percent (409-410-420

  Group II: Chrome 18 14% 430

  The third group 18- 14% chrome and titanium metals such as stabilizers such as niobium and 430TI, 439, 441

  The fourth group contains 5% Molybdenum added such as 434, 436 and 444

  Group 5: 30- 18% chromium containing not like that in other groups of 445,446,447

?What duplex

  Duplex stainless steel is generally at a higher level of resistance than conventional types of steel and do not take and that is the most popular form of 4462/1 EN

Types of duplex steel

      ASTM EN

      32101S 4162/1

      32304S 4362/1

      32205S 4462/1

      31803S

      32760S 4501/1

     32750S 4410/1

Special Specifications

1. Power up 2 high resistance against corrosion hair 3 hole and high resistance to stress cracking and fatigue leads to both high resistance to corrosion caused by corrosion 4. Integrated 5. Good resistance to fatigue 6. high energy absorption in 7. low thermal expansion 8. good weldability

applications

  1. Heat Exchangers

2. The water heater

3. The chamber pressure

4. tankers

5. Brands parts rotating shaft and pull-crusher retaining walls on offshore platforms6. tankers materials and piping systems for chemical tankers

7. digest the pulp and paper industry and other devices

8. ducts gas treatment

9. seawater system

10 desalination plants

General coordinates

  Duplex stainless steel as Catch- do not-magnetic (magnetic - non-magnetic) also known that a large number of beneficial properties of both paid and non-magnetic stainless steel is capable of

Due to the high percentage of chromium and nitrogen in most cases Molybdenum has a high resistance to corrosion of the spot and are uniform. Microscopic structure of duplex steel for increased capacity (power) and resistance to stress corrosion cracking in it. Duplex steel with good weldability are the resort property

Corrosion resistance

  Due to a high percentage of chromium duplex steel for excellent corrosion resistance in many environments as well

  ( Uniform corrosion )

  This type of corrosion occurs when a corrosive environment in the vicinity of the steel surface and corrosion can be uniformly exposed

Generally, when the rate of corrosion in steel is less than 0.1 mm per year, with good resistance to corrosion of stainless steel is considered

  Due to the high percentage of chromium duplex steel having excellent resistance to corrosion in many environment

2304SAF of 4404 was in many cases and other types of duplex stainless steel with higher alloys more resistant to corrosion of the show. Sulfuric acid or chlorine ions together in an effortless, duplex steel type 2205 of 4404 much better corrosion resistance and resistance shown is equivalent to steel type 904 L

(Pitting and hair (PITTING

  With increasing chromium, molybdenum and nitrogen in stainless steel increases its resistance to pitting corrosion

  Stress corrosion cracking

  Chloride in a high-temperature, non-magnetic steel styles by stress corrosion cracks are exposed. Styles of duplex steel due to the continuation of their magnetic phase are much less sensitive against such corrosion

Sulphides lead to stress corrosion cracks

  HCl solution in the presence of sulfide and hydrocarbons, leading to the possibility of stress corrosion cracks in the temperature is lower. Such a situation could occur in the body of oil and gas wells sharply finds. While a variety of styles in 2205 and 2507SAF show good resistance to such conditions as Stainless steel with 13% chromium have a greater tendency to stress corrosion leading to cracks

(Corrosion fatigue )

  Duplex stainless steel due to high mechanical strength and high resistance to corrosion has high ability against corrosion fatigue resistance of 2205 steel in seawater (artificial) it is more than other types

Corrosion inside the crystal

  Due to certain microscopic structure and low rates of carbon steel type has very good resistance to corrosion inside the crystal are

And in such a way that the emergence of non-magnetic state in a heated area to ensure welding Carbides and nitrides and the emergence of unwanted at grain boundaries in steel case reduced to a minimum

Boil

  Good weldability of stainless and duplex stainless steel welding methods about them is true

  Stainless steel welding methods

  Metal arc welding with protection

  Gas tungsten arc welding

  Metal arc welding, gas

  Arc welding electrodes

  Plasma arc welding

  Submerged arc welding

The following general guidelines can generally be used during welding.

  1. The welding material must be done without preheating.

  2. The material must cool opportunity to lower limit of 150 ° C between stages have different boiling.

  3. In order to ensure the profile is good for the weld metal, filler materials used.

  4. In order to achieve a balance between magnetic and non-magnetic conditions in welding, arc welding power must remain within prescribed limits

5. To ensure non-occurrence of corrosion drilled in GTIM welding and PAW, adding nitrogen in the shielding gas is recommended

Austenitic stainless steel: Austenitic 300 series

 

Most austenitic stainless steel used in other types of stainless steels and accounted for almost 80% of the world market. Its structure, which is at least 7% nickel steel structure fully austenitic and flexibility has caused steel, for use in high-temperature-resistant, non-magnetic and to show good weldability

The main characteristic of this class of stainless steel, ease of welding and excellent corrosion resistance - soft and flexible for cold and they are non-magnetic. According to what was mentioned, stainless steel, for use in atmospheric environment, water and a variety of chemical environments of their choice. But, depending on the type of environment, should the chemical composition of steel to be used. Except for resistance to certain corrosive environments, austenitic stainless steel properties

Metallurgical

(A) convert the austenite to martensite due to cold work types 301, 302 and 304

(B) carbon and alloy element chromium and chromium carbide to remove the possibility of intergranular corrosion prevention in a variety L304 L316, 321, 347

(C) alloyed with molybdenum to increase pitting corrosion resistance in a variety of 316

  (D) the use of higher levels of alloying elements chromium and nickel to increase strength at high temperatures (refractory steel) and resistance to scaling in the types 309 and 310 as well

Application

Tanks for storage of chemicals - Kitchen - Industrial pipes foreign -External Facade of buildings - structure

Ferritic stainless steel Series 400 Ferritic

These stainless steels are magnetic and have good physical and mechanical properties The major alloying element in this group chromium enough to stabilize the ferrite phase is complete in order to prevent the formation of phases that are destructive in terms of flexibility and toughness,Fast cooling This type of steel that contains a higher percentage of alloying elements are required. Ferritic stainless steels have properties similar to carbon steel with the difference that resistance to corrosion is far better These steels typically contain between 12 and 17 Percent of Chrome in their structure With values approximately 12% chromium steels for use in steel structure with approximately 17% chromium values boiler - Washing machines - used for interior decoration and household appliances they are going

Austenitic stainless steel - ferritic: Austenitic-Ferritic Duplex

These stainless steels both metallurgical structure of ferrite and austenite phases at the same time so they have also been called duplex stainless steels These steels contain dozens of Element nickel to stabilizing the austenite phase and gain flexibility properties high quantities of chromium to stabilizing the ferrite phase and gain strength and toughness properties of steel are suitable

Application

Petrochemical industry - paper - sugar and sugar cane as well as shipbuilding

The martensitic stainless steel: Martensitic

For many applications that require not only corrosion resistance but also require high strength, high hardness, resistance to wear and maintain sharp edges and angles in pieces, martensitic steels are steels used can be the first blacksmith

  Then the austenitic and rapid cooling (martensite formation) and reheating the heat treatment was

Martensitic stainless steel magnetism and ability to achieve variable range of hardness. Blade for steam turbines of this type of steel is used

Contrary to what the public thought that stainless steel does not rust, corrode stainless steel due to a combination of electron it is possible

Stainless steel has increased by 5.10% Cr conventional steel comes to stainless steel so it should not be less than 5.10% chromium stainless steel, he said. Other compounds in stainless steel, nickel and other properties increase. For example, Element nickel properties forming capability, transparency and high temperature resistance makes stainless steel

As mentioned by adding 5.10% chromium stainless steel is produced The compound in the presence of oxygen in the air to chromium oxide Cr2O3 turns thickness of the coating is 130 Å Angstroms. (One angstrom is equal to one hundred millionth of a centimeter) and taken immediately to prevent rusting of the iron The hard ceramic coating, although such is vulnerable but And a single scratch if there is enough oxygen in the environment to form new layers and gradually rust is not found Why is it that when a gasket made of stainless steel with a rubber gasket to our extremely strong Over time, rust will suffer from lack of oxygen. It is worth noting that due to bending and other forming operations, the cover is removed and be held regularly Stainless steel is a lot of salt in the sea water and well water with high chlorine deficits is Because chlorine has an impact on the external surface of stainless steel and if the scratches on the surface of stainless steel it will not be possible to repair and of the vale, water with high salt or high chlorine every day can not start the destruction of stainless steel What about steel and its derivatives should be taken into consideration is that Stainless steel should be in contact with the air and if as a result of cold working, such as bending, cutting, shaping, etc. covering its surface is damaged and there is oxygen in the vicinity, who will rust Due to the unknown and uncertain elements on stainless steel Production and import sources often enter the country without proper technical knowledge Do not be solely relied on to comment seller For the detection of resistant or fire resistant stainless steel is not possible for any vendor to provide it with documents

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