Steel 30KHNML

Designation

Name The value
Designation GOST Cyrillic 30ХНМЛ
Designation GOST Latin 30XHML
Transliteration 30HNML
By chemical elements 30CrНMo

Description

30KHNML steel is used: for the manufacture of castings for critical loaded parts, which are requirements of high strength and sufficient toughness, working under static and dynamic loads at temperatures up to +400 °C.

Standards

Name Code Standards
Steel castings В82 GOST 977-88, OST 3-4365-79, TU 108.11.352-87

Chemical composition

Standard C S P Mn Cr Si Ni Fe Mo
GOST 977-88 0.25-0.35 ≤0.04 ≤0.04 0.4-0.9 1.3-1.6 0.2-0.4 1.3-1.6 Rest 0.2-0.3
Fe is the basis.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Hardening in air, 860-870 °C + vacation at 600-650 °C, air cooling
100 ≥638 ≥785 ≥10 ≥20 ≥392 206-255
Normalization at 860-880 °C + vacation at 600-650 °C, air cooling
100 ≥540 ≥687 ≥12 ≥20 ≥294 -

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
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number