Steel 34ХН3М

Designation

Name The value
Designation GOST Cyrillic 34ХН3М
Designation GOST Latin 34XH3M
Transliteration 34HN3M
By chemical elements 34CrН3Mo

Description

34ХН3М steel is used: for the manufacture of forgings of various parts of General engineering; major critical components with high requirements to mechanical properties.

Note

The steel alloy of high quality.

Standards

Name Code Standards
Processing of metals by pressure. Forgings В03 GOST 8479-70, TU 0306.018-80, TU 108.11.917-87, ST ЦКБА 010-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Mo
TU 108.11.917-87 0.3-0.4 ≤0.035 ≤0.03 0.5-0.8 0.7-1.1 0.17-0.37 2.75-3.25 Rest ≤0.3 0.25-0.4
Fe is the basis.
According to TU 108.11.917-87, after processing the steel on the OSRV, a limitation on the sulfur content ≤ 0.015% and phosphorus ≤ 0.015% is introduced. The total content of sulfur and phosphorus after OSRV ≤ 0.020%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Forgings. Hardening + Vacation
300-500 ≥640 ≥785 ≥11 ≥33 ≥440 248-293
500-800 ≥640 ≥785 ≥10 ≥30 ≥390 248-293
500-800 ≥685 ≥835 ≥10 ≥30 ≥390 262-311
300-500 ≥735 ≥880 ≥11 ≥30 ≥390 277-321
500-800 ≥735 ≥880 ≥1 ≥30 ≥370 277-321
Forgings. Normalization
100-300 ≥640 ≥785 ≥12 ≥38 ≥490 248-293
100-300 ≥685 ≥835 ≥12 ≥38 ≥490 262-311
300-500 ≥685 ≥835 ≥11 ≥33 ≥390 262-311
100 ≥685 ≥835 ≥13 ≥42 ≥590 262-311
100-300 ≥735 ≥880 ≥12 ≥35 ≥490 277-321
100 ≥735 ≥880 ≥13 ≥40 ≥590 277-321
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
- ≥87 ≥145 ≥62 ≥98 - -
- ≥51 ≥91 ≥67 ≥98 - -
- ≥36 ≥66 ≥72 ≥100 - -
Rod. Quenching in oil with 850-870 °C + Vacation 690 °C (maintained for 5 h) + Quenching in oil with 850-870 °C + Vacation 630-650 °C, (extract 1.5-2 h), air cooling
- ≥860 ≥960 ≥19 ≥49 - -
- ≥760 ≥900 ≥16 ≥60 - -
- ≥720 ≥910 ≥17 ≥56 - -
- ≥700 ≥860 ≥21 ≥70 - -
- ≥540 ≥610 ≥18 ≥75 - -
- ≥460 ≥480 ≥25 ≥89 - -
- ≥160 ≥180 ≥47 ≥96 - -
Rod. Quenching in oil with 850-870 °C + Vacation at 690 °C (maintained for 5 h), air cooling
- ≥530 ≥850 ≥17 ≥49 - -
- ≥500 ≥720 ≥22 ≥68 - -
- ≥470 ≥600 ≥24 ≥76 - -
- ≥320 ≥350 ≥32 ≥91 - -

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

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) a, 10-6 1/°C
0 207 79 7830 - -
20 207 - 7830 - -
100 203 79 7810 36 108
200 198 - 7780 37 116
300 192 - - 37 125
400 182 69 7710 37 133
500 173 59 - 35 135
600 - - 7650 31 135
700 - - - 28 -
900 - - - 27 -
800 - - - - 137

A description of the physical symbols

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

Technological properties

Name The value
Weldability Limited weldability. Method of welding: SMAW, ESW. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости Malosolone.
The temperature of forging Start - 1240 °C, the end - 780 °C. the cross Sections up to 100 mm are cooled in air, 101-350 mm - in the pit.
Flock-sensitive sensitivity Excessively sensitive.
Machinability In the annealed condition at 210-230 HB blower SB=640 MPa Kn TV.SPL.=0,8.