Alloy 20ХГСН2МФА (ДИ107)

Designation

Name The value
Designation GOST Cyrillic 20ХГСН2МФА
Designation GOST Latin 20XGCH2MFA
Transliteration 20HGSN2MFA
By chemical elements 20CrGePbNi2CuP
Name The value
Designation GOST Cyrillic ДИ107
Designation GOST Latin DI107
Transliteration DI107
By chemical elements ДIr107

Description

Alloy 20ХГСН2МФА used: for the manufacture of long products and forgings; loaded and the most critical parts of the aircraft.

Note

High-strength steel, structural, high quality, bromocinnamaldehyde.

Standards

Name Code Standards
Classification, nomenclature and General rules В20 OST 1 90005-91
Blanks. Of the workpiece. Slabs В31 TU 1-92-156-90

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Forgings. Quenching in oil with 890-910 °C + Vacation at 200-250 °C (extract 3 hours), air cooling
≥1080 1320 ≥10 ≥50 ≥735 - -
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - 1230-1420 - - - 353-401 38-43
- - 1230-1470 - - - - 38-43.5
- - 1320-1520 - - - 376-429 40-44

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)