GOST for bearing steel
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GOST 801-78, general provisions
GOST 801-78 establishes: methods of production of bearing steel. It can be produced by hot rolling methods with diameter or thickness up to and including 250 mm, with subsequent calibration or special surface finish (with or without drawing). Steel alloys must be melted in electric arc furnaces with vacuum degassing, without vacuum degassing (by agreement with the customer), acid open-hearth furnaces or electroslag remelting. The standards for chemical composition also apply to ingots, slabs, tubes, sheets, forgings, rolled products and wire;
Marking .
Bearings are made of steel grades ShKh15, ShKh4, ShKh15SG and ShKh20SG. In the designation of steel grades, letters and numbers mean: SH at the beginning of the grade - bearing;X - alloyed with chromium;4, 15, 20 - mass fraction of chromium (0.4%; 1.5%; 2.0%); SG - alloyed with silicon andSG - alloyed with silicon, manganese; S at the end of the grade - produced by electroslag remelting; B at the end of the grade - produced by vacuum degassing.
Unified range of bearing steel
| State of steel | Bar diameter, mm |
| Hot-rolled steel | 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 33; 35; 38; 40; 42; 45; 48; 50; 55; 60; 65; 70; 75; 80; 85; 90; 95; 100; 105; 110; 115; 120; 130; 140; 150; 160; 170; 180; 190; 200; 210; 220; 230; 240; 250 |
| Steel calibrated and with special surface finish | 4,0; 4,5; 5,0; 5,5; 6,0; 6,5; 7,0; 8,0; 9,0; 10,0; 11,0; 12,0; 13,0; 14,0; 15,0; 16,0; 17,0; 18,0; 19,0; 20,0; 21,0; 22,0; 23,0; 24,0; 25,0; 26,0; 27,0; 28,0; 29,0; 30,0; 31,0; 32,0; 33,0; 34,0; 35,0; 36,0; 37,0; 38,0; 39,0; 40,0; 41,0; 42,0; 44,0; 45,0; 46,0; 48,0; 49,0; 50,0 |
Evek GmbH offers to buy bearing steel,
Alloying
For steel ShKh15SG-Sh with a cross section of more than 140 mm, designed for the manufacture of large bearings, set the narrowed limits: the mass fraction of manganese - 1.00% - 1.20%, chromium - 1.40% - 1.65%, silicon - 0.45% - 0.65%. When melting steel in the acid open-hearth furnaces allowed the mass fraction of copper up to 0,30% while maintaining the norm of the total mass fraction of copper and nickel not more than 0,50%.Mass fraction of oxygen in the composition should not be more than 0,0015%. Mass fraction of titanium in composition shall be not more than 0,01%.
Additional processing
Hot-rolled steel shall be made annealed or not annealed, and calibrated and with special surface finish shall be annealed. Steel products with special surface finish and calibrated must not be hardfaced as a result of machining.
Quality requirements
The surface of hot-rolled bars and strips intended for hot work by pressure and for cold forming is not allowed to have rolled cracks, rolls, rolled contamination and bubbles, rolled stains and rips. On the surface of hot-rolled bars and strips intended for cold machining (turning, milling, etc.) are allowed surface defects if their depth does not exceed half of the limit deviation from size, counting from the actual.
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