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Steel 12KHM

Designation

Name The value
Designation GOST Cyrillic 12ХМ
Designation GOST Latin 12XM
Transliteration 12HM
The chemical elements 12CrMo

Description

12KHM steel is used: for the manufacture of hot rolled plates; pipes of superheaters and pipelines and collector installations high pressure; and parts parts of boilers and vessels working under pressure at ambient, elevated and sub-zero temperatures; as the base layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets.

Standards

Name Code Standards
Sheets and stripes В33 GOST 10885-85, TU 108.1263-84, TU 14-1-1409-75, TU 14-1-642-73, TU 05764417-041-95, TU 24-10-003-70, TU 14-1-5093-92
Sheets and stripes В23 GOST 5520-79, GOST 19903-74, GOST 19903-90
Welding and cutting of metals. Soldering, riveting В05 OST 26-17-017-85
Metal forming. Forgings В03 ST ЦКБА 010-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Al Mo
TU 108.1263-84 ≤0.16 ≤0.03 ≤0.035 0.4-0.7 0.8-1.1 0.17-0.35 ≤0.3 The rest ≤0.3 - 0.4-0.55
TU 14-1-5093-92 ≤0.16 ≤0.025 ≤0.025 0.4-0.7 0.8-1.1 0.17-0.37 ≤0.3 The rest ≤0.2 ≤0.02 0.4-0.55
TU 14-1-1409-75 ≤0.16 ≤0.035 ≤0.035 0.4-0.7 0.8-1.1 0.17-0.37 ≤0.3 The rest ≤0.3 - 0.4-0.55
GOST 5520-79 ≤0.16 ≤0.025 ≤0.025 0.4-0.7 0.8-1.1 0.17-0.37 ≤0.3 The rest ≤0.2 ≤0.02 0.4-0.55
Fe is the basis.
According to GOST 5520-79 in the manufacture of steel scrap-process, the mass fraction of copper should not be more than 0.30%.
According to TU 108.1263-84, steel should be smelted in an open-hearth furnace or an electric arc furnace. It is permitted to process steel at the OSRP.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2
Sheet 2, 3, 16, 18-20 categories, treated in the delivery condition
≤5 ≥245 430-550 ≥22 - -
Leaves section 20-160 mm
130-160 ≥195 ≥340 ≥18 ≥32 ≥490
Sheet 2, 3, 16, 18-20 categories, treated in the delivery condition
5-50 ≥245 430-550 ≥22 - ≥588
Leaves section 20-160 mm
130-160 ≥215 ≥390 ≥18 ≥32 ≥490
Sheet 2, 3, 16, 18-20 categories, treated in the delivery condition
51-100 ≥235 ≥430 ≥20 - ≥490
Leaves section 20-160 mm
60-130 ≥215 ≥390 ≥18 ≥32 ≥490
Steel hot-rolled sheet, heat treated in the delivery condition
5-25 ≥235 ≥440 ≥22 - ≥579
Leaves section 20-160 mm
60-130 ≥235 ≥440 ≥18 ≥32 ≥490
20-39 ≥235 ≥440 ≥19 ≥35 ≥490
40-60 ≥235 ≥440 ≥19 ≥35 ≥490
20-39 ≥235 ≥390 ≥19 ≥35 ≥490
40-60 ≥235 ≥390 ≥19 ≥35 ≥490
130-160 ≥295 ≥440 ≥20 ≥50 ≥780
40-130 ≥340 ≥490 ≥20 ≥50 ≥780

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

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