Steel 12KHN2

Designation

Name The value
Designation GOST Cyrillic 12ХН2
Designation GOST Latin 12XH2
Transliteration 12HN2
By chemical elements 12CrН2

Description

12KHN2 steel is used: for the manufacture of gears, shafts, worms, dog clutch, piston pins and other case hardening of parts, which are requirements of high strength, ductility and toughness of core and high surface hardness, working under shock loads and at low temperatures.

Note

The structural quality steel chrome-Nickel.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-5.46-72, TU 14-1-1271-75, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Steel pipes and fittings to them В62 GOST 8732-78, GOST 9567-75, GOST 23270-89, GOST 8731-87, GOST Р 53383-2009, TU 14-3-1654-89
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Processing of metals by pressure. Forgings В03 TU 14-1-1530-75
Sheets and strips В33 TU 14-1-546-72
Tape В34 TU 3-126-81

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.09-0.16 ≤0.035 ≤0.035 0.3-0.6 0.6-0.9 0.17-0.37 1.5-1.9 Rest ≤0.3 ≤0.05 ≤0.03 ≤0.15 ≤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%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Seamless hot deformed tubes in the delivery condition heat treated
- ≥392 ≥539 ≥14 - - - -
Long products (wire). Quenching in water or oil from 860 °C + Quenching in water or oil with 760-810 °C + Vacation at 180 °C, cooling in air or in oil
≤15 - ≥590 ≥780 ≥12 ≥50 ≥863 - -
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
- 200 ≥830 ≥1050 ≥13 ≥66 - - ≥27
Long products (wire). Quenching in oil at 880 °C + Vacation at 600 °C, cooling in water
15-30 - ≥420 ≥550 ≥29 ≥79 ≥363 - -
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
- 300 ≥860 ≥980 ≥12 ≥68 - - ≥25
Long products (wire). Cementation at 920-950 °C + Quenching in oil with 790-810 °C + Vacation at 180-200 °C, air cooling
60-100 - ≥590 ≥780 ≥12 ≥45 ≥677 ≥249 57-63
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
- 400 ≥890 ≥950 ≥12 ≥70 - - ≥24
Long products (wire). Cyanidation at 840-860 °C + Quenching in oil 840-860 °C + Vacation at 180-200 °C, air cooling
30-60 - ≥590 ≥780 ≥12 ≥50 ≥863 ≥229 ≥57
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
- 500 ≥780 ≥830 ≥15 ≥72 - ≥216 -
- 600 ≥590 ≥670 ≥22 ≥76 - ≥321 -

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)

Physical characteristics

Temperature Е, HPa G, HPa l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
600 154 60 30 - 136 586
700 141 55 29 - 139 624
800 130 50 29 1050 139 624
900 - - - 1120 - -
1000 - - - - 117 703

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability Limited weldability: RDS, ADS submerged.
Склонность к отпускной хрупкости Inclined.
The temperature of forging Start - 1250 °C, the end - of 800 °C. the cross Sections up to 100 mm are cooled in air, 101-300 mm - mulde.
Flock-sensitive sensitivity not sensitive.
Machinability When HB 156-207 Kn TV.SPL.=0.8 Kn b.St.=0,7.