Steel 3KH3M3F (ЭИ76)

Designation

Name The value
Designation GOST Cyrillic 3Х3М3Ф
Designation GOST Latin 3X3M3F
Transliteration 3H3M3F
By chemical elements 3Cr3Mo3V
Name The value
Designation GOST Cyrillic ЭИ76
Designation GOST Latin EI76
Transliteration EhI76
By chemical elements -

Description

3KH3M3 °F steel is used: for the manufacture of tool hot deformation at crank presses and horizontal forging machines exposed in the process of intensive cooling (usually small tools); moulds pressure casting of copper alloys.

Standards

Name Code Standards
Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and strips В33 GOST 4405-75, TU 14-131-971-2001
Bars and shapes В32 GOST 5950-2000, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88
Blanks. Of the workpiece. Slabs В31 OST 24.952.01-89

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 5950-2000 0.27-0.34 ≤0.03 ≤0.03 0.2-0.5 2.8-3.5 0.1-0.4 ≤0.4 Rest ≤0.3 0.4-0.6 ≤0.03 2.5-3 ≤0.2
Fe is the basis.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HRC
Rolled steel. Quenching in oil with 1040 °C + Vacation at 600 °C (exposure 2 hours)
- ≥1470 ≥1670 - ≥50 ≥220 -
Long products (samples). Quenching in oil from 1040 °C to + Leave (exposure 2 hours)
- 500 ≥1320 - ≥14 ≥45 ≥490 ≥49
Long products (samples). Quenching in oil from 1040 °C to + Vacation at 600 °C (exposure 2 hours)
- - ≥1470 ≥1670 ≥10 ≥50 ≥220 ≥49
Long products (samples). Quenching in oil from 1040 °C to + Leave (exposure 2 hours)
- 550 ≥1310 - ≥13 ≥51 ≥290 ≥49
Long products (samples). Quenching in oil from 1040 °C to + Vacation at 600 °C (exposure 2 hours)
- - ≥1270 ≥1450 ≥10 ≥50 ≥610 ≥48
Long products (samples). Quenching in oil from 1040 °C to + Leave (exposure 2 hours)
- 600 ≥1290 ≥1670 ≥10 ≥51 ≥220 ≥48
Long products (samples). Quenching in oil from 1040 °C to + Vacation at 600 °C (exposure 2 hours)
- - ≥1210 ≥1370 ≥10 ≥50 ≥610 ≥48
Long products (samples). Quenching in oil from 1040 °C to + Leave (exposure 2 hours)
- 650 ≥1270 ≥1460 ≥10 ≥47 ≥480 ≥44
Long products (samples). Quenching in oil from 1040 °C to + Vacation at 600 °C (exposure 2 hours)
- - ≥1140 ≥1270 ≥10 ≥51 ≥550 ≥44
- - ≥980 ≥1130 ≥12 ≥54 ≥500 ≥35

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
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m
0 207 7828 32 314
300 177 7754 36 515
100 - 7808 34 365
200 - 7783 36 430
400 - 7721 36 600
500 - 7684 36 710
600 - 7642 34 835
700 - 7597 34 965
800 - 7565 33 1118
900 - 7525 34 1151

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
The temperature of forging Start - 1180 °C, the end - 850 °C slow Cooling in the wells.