Characteristics of 20-brand steel
20 steel is a high-grade unalloyed steel used in metal structures and components operating in temperatures of -40°С to +450°С. Hot-rolled and forged long products made from 20 steel conform to the DSTU 7809 and GOST 1050 standards.
Classification: High-grade structural carbon steel.
Products: Rolled products, including shaped.
Chemical composition of 20 steel, %
|
С |
Si |
Mn |
P |
S |
Cr |
Cu |
Ni |
As |
|
0.17-0.24 |
0.17-0.37
|
0.35-0.65
|
<0.04
|
<0.04
|
<0.25
|
<0.25 |
<0.25 |
<0.08 |
Mechanical properties of 20 steel
|
Standard |
Delivery condition |
Minimum yield strength, ReH (MPa) |
Ultimate tensile strength, Rm (MPa) |
Minimum elongation ratio σ, % |
Contraction ratio, % |
Heat treatment |
|
GOST 1050 |
Post-normalisation |
245 |
410 |
25 |
55 |
Post-normalisation |
|
DSTU 7809 |
Post-normalisation |
245 |
410 |
25 |
55 |
Post-normalisation |
Analogues to 20
|
US |
1020, 1023, 1024, G10200, G10230, H10200, M1020, M1023 |
|
Germany |
1.0402, 1.0405, 1.1151, C22, C22E, C22R, Ck22, Cm22, Cq22, St35, St45-8 |
|
Japan |
S20C, S20CK, S22C, STB410, STKM12A, STKM12A-S, STKM13B, STKM13B-W |
|
France |
1C22, 2C22, AF42, AF42C20, C20, C22, C22E, C25E, XC15, XC18, XC25 |
|
UK |
050A20, 055M15, 070M20, 070M26, 1449-22CS, 1449-22HS, 1C22, 22HS, 430, C22, C22E |
|
EU |
1.1151, 2C22, C20E2C, C22, C22E |
|
Italy |
C18, C20, C21, C22, C22E, C22R, C25, C25E |
|
Belgium |
C25-1, C25-2 |
|
Spain |
1C22, C22, C25k, F.112, F.1120 |
|
China |
20, 20G, 20R, 20Z |
|
Sweden |
1450 |
|
Bulgaria |
20, C22, C22E |
|
Hungary |
A45.47, C22E |
|
Poland |
20, K18 |
|
Romania |
OLC20, OLC20X |
|
Czech Republic |
12022, 12024 |
|
Australia |
1020, M1020 |
|
Switzerland |
Ck22 |
|
South Korea |
SM20C, SM20CK, SM22C |
Application
20 steel is used in construction; machine-building; boiler and tank production; and heating elements of various specifications. High-grade unalloyed structural 20 steel in the form of flat and rolled products is used in preparing parts for weld-fabricated structures, pipelines, accumulators, bearing inserts, slings and other products. Thermo-chemical treatment (cementation, nitriding, nitrocarburising etc.) gives the axles, gears, worm screws, friction discs, shafts, spindles, bolts, cogs, pins and other steel components a strong surface hardness and durability, despite a low core strength.
Welding
Any type of welding is applicable, except for components that have been thermo-chemically treated. The standard welding methods are manual-arc, automatic-arc, automatic-arc submerged gas-protected and butt-resistance welding.
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