Steel 50S

Designation

Name The value
Designation GOST Cyrillic 50Х
Designation GOST Latin 50X
Transliteration 50H
By chemical elements 50Cr

Description

50X steel is used: for the production of shafts, spindles, screws, large gear wheels, gear shafts, thrust washers, rolls for hot rolling and other upgradable parts, which are requirements of high hardness, wear resistance, strength, running minor impact loads.

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 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, 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

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.46-0.54 ≤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
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, % d10 y, % KCU, kJ/m2 HB, MPa HRC
Quenching in oil from 820 °C to + vacation at 650 °C
≤25 - 760 980 10 - 45 590 - -
Hardening + Vacation
500-800 - 345 590 12 - 38 390 174-217 -
A rod with a diameter of 25 mm. Quenching in oil from 820 °C [118]
- 300 1670 1810 10 - 30 - 520 -
Sample diameter 10 mm, length 100 mm Quenching in oil from 820-840 °C + vacation at 600-650 °C, air cooling
- - - 87 - 21 37 - - -
Hardened in oil from 830 °C to + vacation at 190 °C
≤25 - 1270 1470 6 - 22 290 - 46
Hardening + Vacation
100-300 - 540 685 13 - 40 490 223-262 -
A rod with a diameter of 25 mm. Quenching in oil from 820 °C [118]
- 400 1520 1670 13 - 40 - 470 -
Sample diameter 10 mm, length 100 mm Quenching in oil from 820-840 °C + vacation at 600-650 °C, air cooling
- - - 43 - 14 23 - - -
Hardened in oil from 830 °C to + vacation at 520 °C, cooling in water
≤25 - 885 1080 9 - 40 390 - -
Hardening + Vacation
100-300 - 590 735 13 - 40 490 235-277 -
A rod with a diameter of 25 mm. Quenching in oil from 820 °C [118]
- 500 1270 1420 17 - 52 - 400 -
Sample diameter 10 mm, length 100 mm Quenching in oil from 820-840 °C + vacation at 600-650 °C, air cooling
- - - 25 - 16 20 - - -
Hardening + Vacation
≤100 - 640 785 13 - 42 590 248-293 -
A rod with a diameter of 25 mm. Quenching in oil from 820 °C [118]
- 600 1030 1180 21 - 60 - 320 -
Sample diameter 10 mm, length 100 mm Quenching in oil from 820-840 °C + vacation at 600-650 °C, air cooling
- - - 21 - 35 61 - - -
Normalization
≤100 - 345 590 18 - 45 590 174-217 -
A rod with a diameter of 50 mm. Quenching in oil from 820 °C to + vacation, cooling in oil [84]
- 400 1520 1620 - 4 39 49 - -
Normalization
100-300 - 345 590 17 - 40 540 174-217 -
A rod with a diameter of 50 mm. Quenching in oil from 820 °C to + vacation, cooling in oil [84]
- 500 1180 1270 - 9 50 147 - -
Normalization
300-500 - 345 590 14 - 38 490 174-217 -
A rod with a diameter of 50 mm. Quenching in oil from 820 °C to + vacation, cooling in oil [84]
- 600 540 850 - 17 61 - - -

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
d10 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 a, 10-6 1/°C
0 207 78 7820 -
20 207 - 7820 -
100 - - - 128
200 - - - 13
300 - - - 13
500 - - - 138

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 Start - 1250 °C, the end - 770 °C. the cross Sections up to 100 mm are cooled in air, section 101-300 mm - mulde.
Flock-sensitive sensitivity sensitive
Machinability In hot-rolled state when HB 207 and blower SB=630 MPa Kn TV.SPL.=0.85 Kn b.St.=0.80