Steel 30KH

Designation

Name The value
Designation GOST Cyrillic 30Х
Designation GOST Latin 30X
Transliteration 30H
By chemical elements 30Cr

Description

30X steel is used: for the manufacture of hot rolled plates; solid-rolled rings for different purposes, axles, rollers, levers, bolts, nuts and other small parts; fasteners operating at temperatures above +400 °C; details of pipe fittings from rolled steel; forged blanks and forgings (requires heat treatment: quenching in oil and tempering in water or oil).

Note

Structural steel high-quality chrome.

Standards

Name Code Standards
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Sheets and strips В33 GOST 1577-93, TU 14-1-1409-75, TU 14-1-4118-86, TU 14-1-4118-2004
Sheets and strips В23 GOST 82-70, GOST 19903-74, GOST 103-2006, GOST 19903-90
Bars and shapes В22 GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 8319.13-75, GOST 9234-74, GOST 11474-76, GOST 8319.4-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Thermal and thermochemical treatment of metals В04 ST ЦКБА 026-2005

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.24-0.32 ≤0.035 ≤0.035 0.5-0.8 0.8-1.1 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 ≤0.03 ≤0.15 ≤0.2
GOST 10702-78 0.24-0.32 ≤0.035 ≤0.035 ≤0.6 0.8-1.1 ≤0.2 ≤0.3 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%. In accordance with the order, the content of Si = 0.10-0.37%, Mn = 0.4-0.8% can be established.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2 HB, MPa
Hot-rolled steel and hot rolled with special surface finish
- - - - - - - - ≤170
Steel calibrated and calibrated with special surface finish
- - - - - - - - ≤207
- - - - - - - - ≤187
- - - - - - - - ≤187
Quenching in oil from 850-870 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) with the following tempering in water or oil
150 470-530 395 615 15 - 40 539 187-229
Hardening in water from 850 °C + vacation at 550 °C
120 - 520 720 - 21 65 - -
Quenching in water from 800 °C
- 300 540 900 11 - 53 200 -
A rod with a diameter of 40 mm. Quenching in oil from 860 °C to + leave at 500 °C
- - 570 790 25 - 65 1270 -
Quenching in oil from 850-870 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) with the following tempering in water or oil
60 470-530 440 635 16 - 45 588 197-235
Hardening in water from 850 °C + vacation at 550 °C
160 - 410 720 - 18 64 - -
Quenching in water from 800 °C
- 400 560 860 13 - 54 390 -
A rod with a diameter of 40 mm. Quenching in oil from 860 °C to + leave at 500 °C
- - 510 650 21 - 74 980 -
Quenching in oil with 850-870 °C + vacation at 500-600 °C, air cooling
40 - 670 850 17 - 65 1000 -
Hardening in water from 850 °C + vacation at 550 °C
40 - 510 720 - 22 66 - -
Quenching in water from 800 °C
- 500 440 690 18 - 70 390 -
A rod with a diameter of 40 mm. Quenching in oil from 860 °C to + leave at 500 °C
- - 450 500 14 - 75 830 -
Quenching in oil from 860 °C to + leave at 500 °C, cooling in water or oil
100 - 395 615 17 - 45 590 187-229
Hardening in water from 850 °C + vacation at 550 °C
80 - 520 720 - 21 66 - -
Quenching in water from 800 °C
- 600 490 670 17 - 74 540 -
Quenching in oil from 860 °C to + leave at 500 °C, cooling in water or oil
25 - 690 880 12 - 45 690 -
Hardening in water from 850 °C + vacation at 550 °C
120 - 420 680 - 28 60 - -
160 - 420 670 - 27 61 - -
40 - 490 680 - 27 65 - -
80 - 480 680 - 28 62 - -

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
d4 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) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
0 208 83 7820 - 210 - -
20 208 - 7820 - 210 - -
100 211 - 7800 47 259 124 482
300 197 - 7740 42 417 134 513
500 175 - 7670 36 636 142 555
200 - - 7770 44 330 13 496
400 - - 7700 39 517 138 532
600 - - 7630 32 778 146 583
700 - - 7590 29 934 148 620
800 - - 7610 26 1106 12 703
900 - - 7506 27 1145 - 687
1100 - - 7470 - 1205 - 670
1200 - - 7430 - 1230 138 678
1000 - - - - - 128 687

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
a The coefficient of linear expansion

Technological properties

Name The value
Weldability welded is limited. RDS, electroslag welding heating and subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1250 °C, the end - of 800 °C. slow Cooling.
Flock-sensitive sensitivity sensitive