Steel 27ХГСНМЛ

Designation

Name The value
Designation GOST Cyrillic 27ХГСНМЛ
Designation GOST Latin 27XGCHML
Transliteration 27HGSNML
By chemical elements 27CrMnСНMo

Description

27ХГСНМЛ steel is used: for the manufacture of casting parts of aviation, accurate methods of casting in ceramic form of constant models.

Note

High-strength structural alloy steel.

Standards

Name Code Standards
Classification, nomenclature and General rules В20 OST 1 90005-91
Steel castings В82 OST 1 90093-82

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N Al Mo W
OST 1 90093-82 0.24-0.3 ≤0.02 ≤0.02 0.9-1.2 0.7-1 0.5-0.8 1.4-1.8 Rest ≤0.3 ≤0.015 ≤0.08 0.2-0.35 ≤0.2
Fe is the basis.

Mechanical properties

sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- 1270-1470 - - - 363-478 39-45
- 1470-670 - - - 385-515 45-52
Casting. Normalization at 890-910 °C with following tempering at 670-690 °C, air cooling or partial annealing at 780 °C, cooling with the furnace to 670 °C, air cooling + Tempering in oil at 880-900 °C + Vacation at 200-240 °C
≥1175 ≥1470 ≥7 ≥20 ≥294 415-515 -
Casting. Normalization at 890-910 °C with following tempering at 670-690 °C, air cooling or partial annealing at 780 °C, cooling with the furnace to 670 °C, air cooling + Tempering in saltpeter with 880-900 °C to 280-320 °C + Vacation at 250 °C
≥980 ≥1270 ≥8 ≥25 ≥294 363-478 -

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
HRC Rockwell hardness (indenter diamond spheroconical)