Steel 20KHN2M (20ХНМ)

Designation

Name The value
Designation GOST Cyrillic 20ХН2М
Designation GOST Latin 20XH2M
Transliteration 20HN2M
By chemical elements 20CrН2Mo
Name The value
Designation GOST Cyrillic 20ХНМ
Designation GOST Latin 20XHM
Transliteration 20HNM
By chemical elements 20CrНMo

Description

20KHN2M steel is used: for the production of calibrando steel; hot rolled steel bars for cold drawing (rolled) rolled steel intended for the production of parts by hot stamping; manufacturing gears, axle shafts, satellites (gear differential), Cams, hinges and other parts.

Note

Structural steel quality romancelatina.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Bars and shapes В32 GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-1-2622-79, TU 14-11-245-88, TU 14-136-367-2008
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-2622-79 0.16-0.21 ≤0.035 ≤0.035 0.4-0.7 0.4-0.6 0.17-0.37 1.6-2 Rest - - - - -
GOST 4543-71 0.15-0.22 ≤0.035 ≤0.035 0.4-0.7 0.4-0.6 0.17-0.37 1.6-2 Rest ≤0.3 ≤0.05 ≤0.03 0.2-0.3 ≤0.2
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
According to TU 14-1-2622-79, the allowed deviations in chemical composition and the content of residual elements must comply with GOST 4543. At the request of the consumer, the steel is supplied with synthetic slag treatment. The sulfur content of steel treated with synthetic slag should not exceed 0.012%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Hot rolled long products on the other 14-1-2622-79. Quenching in oil from 860±15 °C + Vacation at 200±30 °C, air cooling. Upon receipt of menswallet below the standards permitted povarnya test with heat treatment by mode: the First quenching in oil from 860±15 °With + second quenching in oil with 780±15 °C + Vacation at 200±30 °C, cooling in oil
15 - ≥687 ≥882 ≥11 ≥50 ≥785 415-269 -
Transverse samples. Quenching in oil from 860 °C to + vacation at 200 °C (exposure 2 hours), air cooling
11 - 1210 1420 5 21 373 - -
Transverse samples. Quenching in oil from 860 °C to + leave (exposure 2 hours)
- 200 1210 1420 5 21 373 - -
Quenching in oil from 860 °C + quenching in oil from 780 °C to + vacation at 200 °C, cooling in water or oil
≤15 - 685 880 11 50 765 - -
Transverse samples. Quenching in oil from 860 °C to + vacation at 200 °C (exposure 2 hours), air cooling
8 - 1260 1470 4 21 - - -
Transverse samples. Quenching in oil from 860 °C to + leave (exposure 2 hours)
- 600 970 1010 12 42 510 - -
When carburizing 930-950 °C, air cooling + tempering in oil 810-830 °C + vacation at 180-200 °C, air cooling
15-30 - 930 1180 11 50 765 341 57-63
Transverse samples. Quenching in oil from 860 °C to + vacation at 200 °C (exposure 2 hours), air cooling
8 - 1280 1480 4 21 - - -
When carburizing 930-950 °C, air cooling + tempering in oil 810-830 °C + vacation at 180-200 °C, air cooling
30-50 - 830 1080 10 40 579 250-320 57-63
Transverse samples. Quenching in oil from 860 °C to + vacation at 600 °C (exposure 2 hours), air cooling
11 - 970 1010 12 42 510 - -
8 - 1010 1060 11 27 - - -
8 - 1030 1090 11 23 - - -

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)

Technological properties

Name The value
Weldability RDS heating and subsequent heat treatment.
Склонность к отпускной хрупкости tend not
The temperature of forging Start - 1200 °C, the end - of 800 °C. For workpiece cross-section of more than 60 mm cooling slow.
Flock-sensitive sensitivity sensitive