1. Ordinary annealing: 790-810 degrees heating, furnace cooling to 650 degrees, air cooling - HB170-207
2. Isothermal annealing: 790-810 degrees heating, 710-720 degrees isothermal, air cooling - HB207-229
3. HB207-2293. Normalizing: 900-920 degrees heating, air-cooled - HB270-390
4. High temperature tempering: 650-700 degrees heating, air-cooled - HB229-285
5. -HB229-285
5. Hardening: 860 degrees heating, oil quenching - HRC62-66
6. Low temperature tempering: 150-170 degrees tempering, air cooling - HRC61-66
7. HRC61-66
7. Carbon nitrogen **** infiltration: 820-830 degrees **** infiltration 1.5-3 hours, oil quenching, -60 degrees to -70 degrees deep cold treatment +150 degrees to +160 degrees tempering, air cooling - HRC ≈ 67
(1) production and manufacturing methods: the bearing steel Smelting quality requirements are very high, need to strictly control the content and distribution of sulfur, phosphorus and non-metallic inclusions, because the content and distribution of non-metallic inclusions have a great impact on the life of bearing steel. The higher the amount of inclusions, the shorter the life. In order to improve the quality of smelting, recently has been used in electric furnace smelting and remelting by electroslag, can also be used in vacuum smelting, vacuum self-consumption refining and other new processes to improve the quality of bearing steel. (2) Use: In addition to making balls, bearing rings, etc., sometimes also used to make tools, such as punching dies, gauges. 6. Chemical composition of the national standard, metallurgical standards, Japanese standards in the chemical composition of the main steel number is shown in Table 6-7-24. Table 6-7-24 relevant standards in the chemical composition of the main steel number of the chemical composition of the index Standard No. Steel No. Chemical composition % C Si Mn P S Cr Mo Ni GB/T3086 -82 9Cr18 0.90- 1.00 <0.80 <0.80 <0.035 <0.030 17.00- 19.00 GB/T3203 -82 G20 CrMo 0.17- 0.23 0.20- 0.35 0.65- 0.95 <0.030 <0.030 0.35- 0.65 0.08- 0.15 YB(T )1 -91 GCr15 0.95- 1.05 0.15- 0.35 0.25- 0.45 <0.025 <0.025 1.40- 1.65 <0.30 JISG4805 -90(96) SVJI 0.95- 1.10 0.15- 0.35 <0.50 <0.025 <. SUJ2 100Cr6 100Cr6 wx15 1 9Cr18Mo 440C SUS440C Z100CD17
Characteristics: good overall performance. Spheroidal annealed with good cutting performance. High and uniform hardness after quenching and tempering, high wear resistance and contact fatigue
High labor strength. Hot working performance is good. Containing called more alloying elements, the price is relatively cheap. GCR15 steel is a high-carbon chromium bearing steel in the use and production of the most
More grades, is widely used in the world. GCR15 steel is the most widely used and produced grade of high carbon chromium bearing steel, and is widely used in the world. However, it has strong white point sensitivity and poor welding performance.
Use: Used to make all kinds of bearing rings and rolling elements. For example: the production of internal combustion engines, electric locomotives, automobiles, tractors, machine tools, steel mills, drilling
Exploration machine, mining machinery, general-purpose machinery, as well as high-speed rotation of a high load mechanical transmission bearings steel fall, rollers and rings.
High and uniform hardness, good wear resistance. Used in the production of small cross-section tempered parts to withstand large loads and stress less large normalized parts.
With the service of bearing wear resistance, also strengthen the top also steel.