The density and specific heat capacity of bearing steel. Physical and mechanical properties
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The chemical composition of the steels of the group under consideration
GOST 801−80 sets the requirements for the composition of these steels, which are given in the table:
|ШХ15||0.95… 1.05||0.17… 0.37||0.20… 0.40||1.30… 1.65||0.027||0.020||0.30||0.25||-|
|SHKh4||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||-|
|SHX20SG||0.90… 1.0||0.55… 0.85||1.4−1.7||1.4… 1.7||0.027||0.020||0.30||0.25||-|
|95Х18-Ш||0.9… 1.0||Up to 0.8||≤0.70||17.0… 19.0||0.030||0.025||0.30||0.25||-|
|11X18M-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 to 0.80|
Note. 1. The percentage content of metallurgical impurities — phosphorus and sulfur, as well as copper and nickel are indicated by the allowable upper limit. 2. The last two grades of steel are produced according to the norms of the branch technical specifications.
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Physical and mechanical properties
At 20 ° C, steel data has the following characteristics:
Thickness of rolled metal,
|Limit of fluidity, MPa)||The limit of temporary resistance. MPa||Relative extension, %||Relative narrowing of the cross-sectional area,%||
KJ / m 2
|Brin-glu hardness, HB||Rockwell, HRC|
|Up to 30||≥1670||≥490||62−65|
|Up to 50||370… 410||590… 730||15−25||35−55||≥432||179−207|
|50 and more||370… 410||590−730||≥20||≥45||≥432|
The technological properties of steels of this group are given in the table:
|Machining by cutting||In the hot-rolled state at НВ up to 202, at a value of the temporary resistance limit of 740 MPa: when using a hard alloy tool K n tv.spl. = 0.90, when using a tool from high-speed steels K nb.st. = 0.36.|
|Weldability||Welding method — CTS|
|Propensity to temper brittleness||Prone|
|Forging temperature||The beginning of forging at 1150 ° C, the end of forging — 800 ° C. Forgings cross-section up to 250 mm are cooled in air, more than 250 mm — in the well|
|Sensitivity to flock formation||Sensitive|
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