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: Steel Sheets, long product.
Chemical composition of 20 steel, according DSTU 7809%
| | Si | Mn | P | S | Cr | Cu | Ni |
| | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.040 | ≤0.25 | ≤0.30 | ≤0.30 |
Mechanical properties of 20 steel after normalization
| Minimum yield strength, N/mm2, not less | Ultimate tensile strength, N/mm2, not less | Minimum elongation ratio, %, not less | Contraction ratio, %, not less |
| 245 | 410 | 25 | 55 |
Analogues to steel 20
| US | 1020, 1023, 1024, G10200, G10230, H10200, M1020, M1023 |
| Japan | S20C, S20CK, S22C, STB410, STKM12A, STKM12A-S, STKM13B, STKM13B-W |
| EU | 1.1151, 2C22, C20E2C, C22, C22E |
| China | 20, 20G, 20R, 20Z |
| Sweden | 1450 |
| 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.
