Density and specific heat of bearing steel. Physical and Mechanical Properties

Density and specific heat of bearing steel
Bearing steel welding
Annealing, hardening of bearing steel
Bearing steel designation
Application of bearing steel

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Chemical composition, GOST 801-80

steel grade C, % Si, % Mn, % Cr, % P, % S, % Ni, % Cu, % Mo, %
SHCR15 0,95...1,05 0,17...0,37 0,20...0,40 1,30...1,65 0,027 0,020 0,30 0,25 -
SHC4 0,95...1,05 0,15...0,30 0,15...0,30 0,35...0,50 0,027 0,020 0,30 0,25 -
ШХ15СГ 0,95...1,05 0,40...0,65 0,9-1,2 1,3...1,65 0,027 0,020 0,30 0,25 -
SHC20CG 0,90...1,0 0,55...0,85 1,4-1,7 1,4...1,7 0,027 0,020 0,30 0,25 -
95CR18-S 0,9...1,0 Up to 0.8 ≤0,70 17,0...19,0 0,030 0,025 0,30 0,25 -
11Х18М-SHD 1,10...1,2 0,53...0,93 0,50...1,0 16,5...18,0 0,025 0,015 0,30 0,3 0,50...0,80

Note. 1. Percentages of metallurgical impurities - phosphorus and sulfur, as well as copper and nickel are given at the permissible upper limit. 2. The last two steel grades are produced in accordance with industry-specific specifications.

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Mechanical properties (temperature 20°C)

Rolled thickness, mm yield strength, MPa) Tensile strength. MPa Relative elongation, % Relative narrowing of section area, %

Tensile strength,

kJ/m2

 Brinell hardness, HB Rockwell hardness, HRC
To 30 ≥1670 ≥490 62-65
Up to 50 370...410 590...730 15-25 35-55 ≥432 179-207
50 and over 370...410 590-730 ≥20 ≥45 ≥432

Technological properties of steels of this group

Machinability In hot-rolled condition (NV up to 202, ultimate tensile strength 740 MPa): when using carbide toolsKn bonds=0,90, when using high-speed steel toolsKn bonds=0,36.
Weldability Welding method - STS
Tendency to temper embrittlement Prone to
Forging temperature Starting forging at 1150 °C, finishing forging - 800 °C. Forgings with cross-section up to 250 mm are cooled in the air, forgings over 250 mm - in the well.
Sensitivity to flaking Sensitive
Grindability Good

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