Steel 35KH

Designation

Name The value
Designation GOST Cyrillic 35Х
Designation GOST Latin 35X
Transliteration 35H
By chemical elements 35Cr

Description

Steel 35KH used: for the manufacture of axles, shafts, gears, ring rails, and other upgradable parts, rings of turbogenerators for the production of parts of pipeline fittings from rolled, forged blanks and forgings required heat treatment: quenching in oil and tempering in water or oil.

Note

Structural steel high-quality chrome.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, TU 14-1-5414-2001, TU 3-1053-86, TU 14-1-1577-76, TU 14-1-1974-77, 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
Bars and shapes В22 GOST 8319.0-75, GOST 8319.13-75, GOST 8319.4-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings В03 GOST 8479-70, OST 5Р.9125-84, TU 3-896-78, ST ЦКБА 010-2004
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
Sheets and strips В33 TU 14-1-4118-86, TU 14-1-4118-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.31-0.39 ≤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 0.31-0.39 ≤0.035 ≤0.035 0.5-0.8 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% can be established.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % 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
- - - ≥690 ≥5 ≥40 - -
- - - - - - - ≤197
- - - - - - - ≤197
Forgings. Hardening + Vacation
100-300 - 395 615 15 40 540 187-229
100 - 490 655 16 45 590 212-248
Quenching in oil from 840-870 °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
120 500-550 440 635 14 40 539 197-235
Normalization at 850 °C + vacation at 660 °C, air cooling + tempering in water from 850 °C + vacation at 570 °C, cooling in water or oil
30 - 760 880 15 50 780 262
Hardening in water from 850 °C
- 500 880 980 15 53 980 -
Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential)
- - 294 491 16 30 294 -
Quenching in oil from 840 °C to + vacation at 580 °C
- - 460 690 28 - - -
Quenching in oil from 840-870 °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
80 500-550 590 685 14 45 588 235-277
Normalization at 850 °C + vacation at 660 °C, air cooling + tempering in water from 850 °C + vacation at 570 °C, cooling in water or oil
50 - 650 820 15 50 780 248
Hardening in water from 850 °C
- 600 680 830 19 61 1270 -
Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential)
- - 392 589 16 30 491 -
Quenching in oil from 840 °C to + vacation at 580 °C
- - 390 700 22 - - -
Quenching in oil from 840-870 °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
60 500-550 640 785 13 45 588 248-293
Normalization at 850 °C + vacation at 660 °C, air cooling + tempering in water from 850 °C + vacation at 610 °C, cooling in water or oil
120 - 490 700 15 50 590 207
Hardening in water from 850 °C
- 700 540 710 24 68 1660 -
Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential)
- - 491 687 16 30 392 -
Quenching in oil from 840 °C to + vacation at 580 °C
- - 360 670 22 - - -
Quenching in oil from 860 °C to + leave at 500 °C, cooling in water or oil
25 - 735 910 11 45 690 -
Normalization at 850 °C + vacation at 660 °C, air cooling + tempering in water from 850 °C + vacation at 610 °C, cooling in water or oil
160 - 450 670 15 50 590 197
Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential)
- - 589 765 16 35 491 -
Quenching in oil from 840 °C to + vacation at 580 °C
- - 310 540 24 - - -
Normalization at 850 °C + vacation at 660 °C, air cooling + tempering in water from 850 °C + vacation at 610 °C, cooling in water or oil
240 - 390 630 15 50 590 187
Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential)
- - 687 834 14 35 491 -
Normalization at 850 °C + vacation at 660 °C, air cooling + tempering in water from 850 °C + vacation at 610 °C, cooling in water or oil
80 - 550 740 15 50 780 217
Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential)
- - 785 932 13 35 392 -
- - 883 1010 12 30 392 -
- - 981 1079 11 30 294 -

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 l, W/(m · °C) a, 10-6 1/°C
0 214 83 - -
20 214 - - -
300 207 74 40 129
500 176 65 - 142
100 - - 47 113
200 - - 43 12
400 - - 36 137
600 - - - 142
800 - - - 146

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. Welding methods: SMAW, ESW. Recommended heating and subsequent heat treatment. The CCC - recommended subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1250 °C, the end - of 800 °C.
Flock-sensitive sensitivity insensitive