Stainless steel grades according to AISI, GOST. Table of compliance with DIN, SMS, ISO, GOST. Chemical composition of stainless steel EN, AISI, ASTM

The most common steel grades according to AISI and their scope of application

AISI 304

The most common brand of steel in everyday life. It is used in the manufacture of furniture, structures, interior items, decor, in equipment for the food and pharmaceutical industries, in mechanical engineering and construction.

AISI 321

This brand is most often used in pipelines working under pressure: pipes, pipeline parts, tees, bends, flanges, transitions, shut-off valves, heat exchangers, collectors.

AISI316

Elements and details of pipelines and structures operating in environments with a high content of alkalis, solutions of salts and acids. All installations and units located in highly aggressive environments.

08X18H10

It is recommended for the manufacture of welded products operating in environments of less high aggressiveness than steel grades 12X18N10T and 12X18N12T. Steel has a reduced resistance to intercrystalline corrosion compared to steel 12X18N10T and 12X18N12T. Pipes, pipeline parts and fittings, heat exchangers, muffles, retorts, pipes, exhaust manifolds, welded apparatuses and vessels of chemical engineering

10X17H13M2T

It is recommended for the manufacture of welded structures operating in boiling phosphoric, sulfuric, 10% acetic acid and sulfuric acid environments. Devices and vessels operating in environments of increased aggressiveness. The blades of the gas blower, stamped from sheet steel, rivets made by the method of hot landing, forging discs, tires, shafts and other parts of compressor machines, turbine parts.

12X18H10T

Details and components of the main equipment and pipelines of the AEU with a water coolant. Blades, pipes and other parts of power engineering, operating at temperatures up to +600 °C. Welded apparatuses and vessels operating in dilute solutions of nitric, acetic, phosphoric acids, solutions of alkalis and salts; adsorber bottoms, regenerators, heat exchangers, etc. Housings and other parts working under pressure at temperatures from -196 °C to +600 °C, and in the presence of aggressive media up to+350 °C.

Stainless steel is a corrosion-resistant steel, a type of alloy steel, resistant to corrosion in the atmosphere and aggressive environments due to the chromium content of 12% or more. There are various brands of stainless steels on the market. The most common steel grades are AISI 304, AISI316 and AISI 321.

AISI304 (08X18H10)
The most common and most popular brand of steel. Steel of this brand is used in many industries.This brand is also used in the food, chemical and pharmaceutical industries. It is well processed and has good corrosion resistance indicators.

AISI316 (10X17H13M2)
Stainless steel of this brand has higher corrosion resistance to aggressive environments. This brand is used in those industries where the use of AISI 304 is not possible. This brand is more often used in chemical industry enterprises where alkalis and acids are used.

AISI321 (12X18H10T)
The steel of this brand also has good corrosion resistance indicators. It is also well processed and weldable, like the previous two. Most often, this brand of steel is used in products that have higher requirements for mechanical properties and heat resistance.

Compliance table DIN, SMS, ISO, GOST
Standard DIN SMS ISO GOST
Nominal diameter, inch Nominal diameter (DN, DN), mm Outer diameter, mm Outer diameter, mm Outer diameter, mm Outer diameter, mm
1 / 8" 5     10.3 6
1 / 4" 8   6.35 13.7 8
3 / 8" 10 12 (13) 9.54 17.1 10
1 / 2" 15 18 (19) 12.7 21.3 14
3 / 4" 20 22 (23) 19.05 26.9 18
1" 25 28 (29) 25 33.7 25
1 1 / 4" 32 34 (35) 31.75 42.4 38
1 1 / 2" 40 40 (43) 38 48.3 45
2" 50 52 (53) 50.8 60.3 57
2 1 / 2" 65 70 63.5 76.1 76
3" 80 85 (84) 76.1 88.9 89
4" 100 104 101.6 114.3 108
5" 125 129 129 139.7 133
6" 150 154 154 168.3 159
8" 200 204 204 219.1 219
10" 250 254 254 273 273
12" 300     323.9 325
14" 350     355.6 377
16" 400     406.4 426
20" 500     508 530
24" 600     609.6 630
28" 700     711.2 730
32" 800     812 820
Type of steel Steel grade according to EN Steel grade according to AISI/ASTM Designation Chemical composition of steel
steel C Si Mn P max S N Cr Mo Ni
Austenitic
steel
1.4301 304 X5CrNi18-10 ≤0,07 ≤1,00 ≤2,00 0.045 ≤0,015(2) ≤0,11 17,50 - 19,50   8,00 - 10,50
Austenitic
steel
1.4541 321 X6CrNiTi18-10 ≤0,08 ≤1,00 ≤2,00 0.045 ≤0,015(2)   17,00 - 19,00   9,00 - 12,0
Austenitic
steel
1.4401 316 X5CrNiMo17-12-2 ≤0,07 ≤1,00 ≤2,00 0.045 ≤0,015(2) ≤0,11 16,50 - 18,50 2,00 - 2,50 10,00 - 13,00