Steel 38KHS

Designation

Name The value
Designation GOST Cyrillic 38ХС
Designation GOST Latin 38XC
Transliteration 38HS
By chemical elements 38CrС

Description

38KHS steel is used: for the manufacture of shafts, gears, clutches, fingers and improve other parts of small dimensions, which are requirements of high strength, elasticity, and durability; solid-rolled rings for different purposes.

Note

Structural steel high-quality chromium-silicon.

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, OST 1 92049-76, TU 14-1-1611-76, TU 14-1-2118-77, TU 14-1-908-74, 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 1133-71, GOST 5267.0-90, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings В03 GOST 8479-70, ST ЦКБА 010-2004
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Steel pipes and fittings to them В62 TU 14-3-642-77

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.34-0.42 ≤0.035 ≤0.035 0.3-0.6 1.3-1.6 1-1.4 ≤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%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Forgings. Hardening + Vacation
≤100 - ≥540 ≥685 ≥15 ≥45 ≥579 223-262
≤100 - ≥590 ≥735 ≥14 ≥45 ≥579 235-277
Quenching in water or oil from 900 °C + Vacation at 630 °C, cooling in water or oil
≤100 - ≥540 ≥685 ≥15 ≥45 ≥590 -
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-120 - ≥720 ≥950 ≥17 ≥60 ≥746 -
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
- 200 ≥1670 ≥1960 ≥10 ≥40 ≥590 -
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
- - - - - - - ≤255
Quenching in water or oil from 900 °C + Vacation at 630 °C, cooling in water or oil
25 - ≥735 ≥930 ≥12 ≥50 ≥690 -
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
30-50 - ≥870 ≥1030 ≥18 ≥58 ≥1383 -
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
- 300 ≥1580 ≥1760 ≥10 ≥42 ≥490 -
Ring forged in OST 1 92049-76. Quenching in oil with 885-915 °C + Vacation at 600-660 °C, cooling in oil
25 - ≥695 ≥880 ≥9 ≥40 ≥510 -
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
50-80 - ≥790 ≥980 ≥16 ≥56 ≥1040 -
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
- 400 ≥1370 ≥1570 ≥10 ≥45 ≥590 -
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-120 - ≥620 ≥890 ≥20 ≥58 ≥618 -
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
- 500 ≥1080 ≥1270 ≥12 ≥50 ≥690 -
Rolled steel. Quenching in oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-120 - ≥680 ≥910 ≥16 ≥57 ≥657 -
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
- 600 ≥880 ≥980 ≥18 ≥55 ≥780 -
Rolled steel. Quenching in oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
≤30 - ≥770 ≥960 ≥15 ≥59 ≥942 -
30-50 - ≥810 ≥1000 ≥16 ≥56 ≥824 -
50-80 - ≥720 ≥920 ≥17 ≥53 ≥647 -
80-120 - ≥500 ≥840 ≥22 ≥60 ≥765 -

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) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
20 211 84 7640 38 284 - -
100 203 80 - 38 329 123 466
200 194 78 - 37 413 131 508
300 184 72 - 35 563 136 529
400 174 68 - 34 725 138 563
500 166 65 - 33 902 142 592
600 157 62 - 31 1060 145 621
700 139 55 - 29 1280 147 634
800 127 48 - 28 - 147 634
1000 - - - - - 125 663

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. Welding methods: RDS - necessary heating and subsequent heat treatment. CCC - a necessary subsequent heat treatment.
Склонность к отпускной хрупкости Inclined.
The temperature of forging Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 250 mm are cooled in air, 251-350 mm - in the pit.
Flock-sensitive sensitivity not sensitive.
Machinability At 250 to 300 HB[100] blower SB=780-880 MPa Kn TV.SPL.=0.8 Kn b.St.=0,72.