Steel SHKH15SG
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ШХ15СГ |
| Designation GOST Latin |
ShX15CG |
| Transliteration |
ShH15SG |
| The chemical elements |
- |
Description
SHKH15SG steel is used: for the manufacture of seamless hot-deformed pipes, intended for the manufacture of rings, ball and roller bearings; large-size forged rings, ball and roller bearings with a wall thickness of 20−30 mm; balls with a diameter more than 50 mm; rollers with a diameter greater than 35 mm; bearings for railway transport.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В23 |
GOST 103-2006 |
| Sectional and shaped rolling |
В22 |
GOST 2590-2006, GOST 2591-2006 |
| Pipes steel and connecting parts to them |
В62 |
GOST 800-78 |
| Sectional and shaped rolling |
В32 |
GOST 801-78, GOST 7417-75, GOST 14955-77, TU 14-1-3494-82, TU 1-83-77-90, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-1213-75, TU 14-1-3680-83, TU 14-1-3911-85 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 801-78 |
0.95-1.05 |
≤0.02 |
≤0.027 |
0.9-1.2 |
1.3-1.65 |
0.4-0.65 |
≤0.3 |
The rest |
≤0.25 |
Fe is the basis.
According to GOST 801-78 and TU 14-1-3911-85 the chemical composition is given for steel grade SHH15SG. The total content of Ni + Cu≤ 0.50%. In steel, obtained by the method of electroslag remelting, the mass fraction of sulfur should not exceed 0.01%, and phosphorus 0.025%. When steel is smelted in acid open-hearth furnaces, the mass fraction of copper is allowed up to 0.30%, while maintaining the norm of the total share of copper and nickel is not more than 0.050%. For steel ШХ15СГ-Ш with a cross section of more than 140 mm intended for the manufacture of large-sized bearings, restricted limits are established: the mass fraction of manganese is 1.00-1.20%, chromium is 1.40-1.65%, silicon is 0.45- 0.65%.
Mechanical characteristics
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
HRC |
| Rolled steel. Quenching in oil from 810-840 °C to + Leave at 150 °C, air cooling |
| ≤25 |
- |
- |
1960-2350 |
- |
- |
290-690 |
- |
61-65 |
| Rolled steel. Quenching in oil from 820 °C to + Vacation |
| - |
160 |
2250-2370 |
1960-2350 |
- |
- |
- |
- |
62-65 |
| Rolled steel. Annealing at 790-810 °C, cooled with the furnace to 730 °C, from 730 to 650 °C cooling at a speed of 10-20 °C/h, then in air (isothermal annealing) |
| ≤50 |
- |
370-410 |
590-730 |
15-25 |
35-55 |
≥432 |
179-217 |
- |
| Rolled steel. Quenching in oil from 820 °C to + Vacation |
| - |
200 |
2130-2280 |
2160-2550 |
- |
- |
- |
- |
60-62 |
| - |
250 |
2120-2200 |
- |
- |
- |
- |
- |
59-61 |
| - |
300 |
1860-2040 |
- |
- |
- |
- |
- |
58-59 |
| - |
330 |
1850-1950 |
- |
- |
- |
- |
- |
56-57 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
r, кг/м3 |
a, 10-6 1/°С |
| 0 |
211 |
79 |
7650 |
- |
| 20 |
211 |
- |
7650 |
- |
| 200 |
- |
- |
- |
134 |
| 300 |
- |
- |
- |
134 |
| 500 |
- |
- |
- |
136 |
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 |
The method of welding the CCC. |
| Propensity to temper brittleness |
Inclined. |
| Forging temperature |
Start - 1150 °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 |
Sensitive. |
| Workability by cutting |
In hot-rolled condition, when blower SB 202 HB=740 MPa Kn TV.SPL.=0,90 Kn b.St.=0,36. |
