Steel 40KHN

Designation

Name The value
Designation GOST Cyrillic 40ХН
Designation GOST Latin 40XH
Transliteration 40HN
By chemical elements 40CrН

Description

40KHN steel is used: for the production of forgings and stampings, axles, shafts, connecting rods, gear wheels, shafts, excavators, couplings, shaft gear, spindles, bolts, levers, rods, cylinders and other critical loaded parts subjected to vibration and dynamic loads, which are requirements of high strength and toughness; rail and structural steel mill rolls and heavy section mill for hot rolling metal.

Note

Structural steel high-quality stainless.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Bars and shapes В32 GOST 4543-71, GOST 7417-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, TU 108.11-927-87, 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
Processing of metals by pressure. Forgings В03 GOST 8479-70, OST 5Р.9125-84, ST ЦКБА 010-2004
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 1-1-0711-80, TU 14-1-4944-90
Sheets and strips В33 TU 14-1-1930-77

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.36-0.44 ≤0.035 ≤0.035 0.5-0.8 0.45-0.75 0.17-0.37 1-1.4 Rest ≤0.3 ≤0.05 ≤0.03 ≤0.15 ≤0.2
GOST 10702-78 0.36-0.44 ≤0.035 ≤0.035 0.5-0.8 0.45-0.75 ≤0.2 1-1.4 Rest ≤0.3 ≤0.05 ≤0.03 ≤0.15 ≤0.2
Fe is the basis.
According to GOST 4543-71, the content of 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
- - - - - - - ≤179
Steel calibrated and calibrated with special surface finish
- - - - - - - ≤207
Quenching in water or oil from 820 °C to + leave at 500 °C, cooling in water or oil
≤25 - 785 980 11 45 677 -
Normalization at 870-925 °C + quenched in oil from 790 °C to + vacation at 540 °C
120 - 710 910 - 50 - 300
Quenching + tempering (forgings)
300-500 - 345 590 14 38 481 174-217
Quenching in oil with 820 °C
- 400 1220 1370 10 41 314 387
Normalization at 850 °C
- - - 790 18 48 - -
Normalization at 870-925 °C + quenched in oil from 790 °C to + vacation at 540 °C
40 - 780 960 18 58 - 325
Quenching + tempering (forgings)
≤100 - 395 615 17 45 579 187-229
Quenching in oil with 820 °C
- 500 1080 1160 14 51 451 302
Normalization at 850 °C
- - - 750 - 50 - -
Normalization at 870-925 °C + quenched in oil from 790 °C to + vacation at 540 °C
80 - 730 920 20 54 - 302
Quenching + tempering (forgings)
100-300 - 395 615 15 40 530 187-229
Quenching in oil with 820 °C
- 600 760 910 20 60 814 241
Normalization at 850 °C
- - - 690 20 - - -
Quenching + tempering (forgings)
300-500 - 395 615 13 35 481 187-229
Normalization at 850 °C
- - - 540 25 65 - -
Quenching + tempering (forgings)
500-800 - 395 615 11 30 383 187-229
Normalization at 850 °C
- - - 480 25 79 - -
Quenching + tempering (forgings)
≤100 - 440 635 16 45 579 197-235
Normalization at 850 °C
- - - 350 27 85 - -
Quenching + tempering (forgings)
100-300 - 440 635 14 40 530 197-235
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 50 mm/min strain rate of 0.03 1/s.
- - - 225 36 92 - -
Quenching + tempering (forgings)
300-500 - 440 635 13 35 481 197-235
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 50 mm/min strain rate of 0.03 1/s.
- - - 130 57 96 - -
Quenching + tempering (forgings)
500-800 - 440 635 11 30 383 197-235
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 50 mm/min strain rate of 0.03 1/s.
- - - 91 71 100 - -
Quenching + tempering (forgings)
≤100 - 490 655 16 45 579 212-248
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 50 mm/min strain rate of 0.03 1/s.
- - - 62 75 100 - -
Quenching + tempering (forgings)
100-300 - 490 655 13 40 530 212-248
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 50 mm/min strain rate of 0.03 1/s.
- - - 45 76 100 - -
Quenching + tempering (forgings)
≤100 - 540 685 15 45 579 223-262
A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 50 mm/min strain rate of 0.03 1/s.
- - - 31 - 100 - -
Quenching + tempering (forgings)
100-300 - 540 685 13 40 481 223-262
≤100 - 590 735 14 45 579 235-277
100-300 - 590 735 13 40 481 235-277
Normalization (forgings)
100-300 - 315 570 14 35 334 167-207
300-500 - 315 570 12 30 285 167-207
500-800 - 315 570 11 30 285 167-207

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 r, kg/m3 l, W/(m · °C) a, 10-6 1/°C
0 200 7820 - -
20 200 7820 - -
100 - 7800 44 118
200 - 7710 43 123
300 - 7840 41 134
400 - 7700 39 134
500 - - 37 -
600 - - - 14

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 difficult weldability. RDS, ADS submerged arc, electroslag welding. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1250 °C, end - 830 °C. the cross Sections up to 50 mm are cooled in air, 50-200 mm - mulde, 201-300 mm - with oven.
Flock-sensitive sensitivity highly sensitive
Machinability In hot-rolled condition in NV 166-170 blower SB=690 MPa Kn TV.SPL.=1.0 Kn b.St.=0.9