GCr15 steel is an alloy content of less good performance, the most widely used high-carbon chromium bearing steel. After quenching and tempering of high and uniform hardness, good wear resistance, high contact fatigue performance. The cold steel, plastic medium, generally cutting, welding performance is poor, sensitive to the formation of white spots, and have a temper brittleness.


Chemical / element content (%)


C :0.95-1 .05 Mn :0.20-0 .40 Si :0.15-0 .35 S: <= 0.020 P: <= 0.027 Cr :1.30-1 .65


The heat treatment system as: annealed steel bar, wire annealing, or 830-840 degrees oil quenching.


Heat treatment process parameters:


1 annealed :790-810-degree heat, furnace cooling to 650 degrees, the air-cooled - HB170-207


(2) :790-810 isothermal annealing heating degree ,710-720 degree temperature, air-cooled - HB207-229


3 normalizing :900-920-degree heat, air-cooled - HB270-390


4 high-temperature tempering :650-700-degree heat, air-cooled - HB229-285


5 Quenching: 860 degree heat, oil quenching - HRC62-66


6 :150-170-degree low-temperature tempering tempering, air-cooled - HRC61-66


7 carbonitriding :820-830 degrees permeation 1.5-3 hours, oil quenched, -60 degrees to -70 degrees to +150 degrees cryogenic treatment to +160 tempering, air-cooled - HRC ≈ 67


(1) manufacturing method: Bearing steel smelting of high quality requirements, the need for strict control of sulfur, phosphorus and non-metallic inclusions content and distribution, because the non-metallic inclusions content and distribution of life on the great influence of bearing steel . The higher the amount of inclusions, the shorter life expectancy. In order to improve the quality of smelting, smelting furnace and has recently been adopted by the ESR, we can use a vacuum smelting, vacuum consumable refining new techniques to improve the quality of bearing steel. (2) Uses: In addition to doing ball, bearing ring endures, and sometimes also used to make tools such as dies, measuring tools. 6 Chemical composition of the national standard, rule standard, Japanese standard, the main chemical composition of steel shown in Table 6-7-24. Table 6-7-24 on standard steel chemical composition of the main indicators of the standard number of steel chemical composition% C Si Mn PS 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 <0.025 0.90-1.20 <0.25 name China United States Japan Germany United Kingdom France Soviet Union International Organization for Standardization GB AST JIS DIN, DINEN BS, BSEN NP, NPEN Grade Grade Grade Grade TOCL ISO630 Grade Grade Grade Grade bearing steel GCr9 51100 SUJ1 GCr15 52100 SUJ2 100Cr6 100Cr6 wx15 1 9Cr18Mo 440C SUS440C Z100CD17


Features: integrated performance is good. Spheroidizing after a good cutting performance after quenching and tempering the high and uniform hardness, wear resistance and contact fatigue


High labor intensity. Thermal processing performance. Contains more alloying elements, the price is cheaper. GCR15 steel is high carbon chromium bearing steel use and production in the most


More grades, are widely used in the world, but the white point of sensitivity, poor welding performance.


Uses: used for the production of bearing rings and rolling elements, such as: production of internal combustion engine, motor vehicles, automobiles, tractors, machine tools, rolling mills, drill


Exploration machine, mining machinery, general machinery, and high-speed rotation of the mechanical transmission of high load bearing steel ball, roller and ring.


High and uniform hardness, good wear resistance. To bear the load for the production of large pieces of small cross-section conditioning large normalizing and stress smaller parts.


The wear resistance of the bearing with service, but also to strengthen the top is steel.


Note:


A steel pipe bearing the residual copper content (melting analysis) should not exceed 0.20%.


2 oxygen content was determined in billet or steel.


3 of the sulfur content of steel (melting analysis) should not exceed 0.020%