07Х21Н9С2М steel (WFW-4)

Designation

Name The value
Designation GOST Cyrillic 07Х21Н9С2М
Designation GOST Latin 07X21H9C2M
Transliteration 07H21N9S2M
By chemical elements 07Cr21Н9С2Mo
Name The value
Designation GOST Cyrillic ВНЛ-4
Designation GOST Latin BHL-4
Transliteration VNL-4
By chemical elements WНBe-4

Description

07Х21Н9С2М steel is used: for the manufacture of cast billets and bars; shaped castings for the aviation industry.

Standards

Name Code Standards
Castings with special properties (iron and steel) В83 OST 1 90090-79
Bars and shapes В32 TU 14-1-861-74

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N Al V Ti Mo W
OST 1 90090-79 ≤0.07 ≤0.03 ≤0.03 0.5-0.9 20.5-22.5 2-2.5 8-9 Rest ≤0.3 ≤0.05 ≤0.1 0.2-0.7 ≤0.05 0.8-1.3 ≤0.2
Fe is the basis.
According to OST 1 90090-79 the chemical composition is given for steel grade 07Х21Н9С2МЛ (VNL-4). In the case when the steel 07Х21Н9С2МЛ (VNL-4) is intended for parts working in corrosive environments, the presence of vanadium in it is not allowed. In steel, the nitrogen content is up to 0.070%.

Mechanical properties

sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2 HB, MPa
The casting and the ceramic mold. Quenching in water with 1000-1120 °C + aging at 500 °C for 8 hours, air cooling
≥392 ≥638 ≥30 ≥40 ≥980 179-229

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number