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Alloy steel for gear wheel and preparation method thereof

A technology of alloy steel and gear, which is applied in the field of large modulus carburized gear steel, which can solve the problems of affecting structure, heat treatment waste products, white spots easily produced by large tooth billets, etc., and achieves the effect of small internal oxidation tendency and high contact fatigue strength

Inactive Publication Date: 2010-01-27
BAOSTEEL SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of Ni used as an alloying element in this steel type, the material cost is expensive. At the same time, it was found during the processing that the large-tooth billet of this steel type is prone to white spots during forging and is scrapped. In addition, improper pretreatment after forging is easy to cause Mixed crystals affect the structure after heat treatment, directly resulting in heat treatment waste

Method used

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  • Alloy steel for gear wheel and preparation method thereof
  • Alloy steel for gear wheel and preparation method thereof
  • Alloy steel for gear wheel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] See Table 1 and continued Table 1, the weight percent of the alloy steel in Example 1 is: C: 0.16; Si: 0.12; Mn: 0.60; Cr: 1.90; Ni: 1.90; P: 0.011; S: 0.003; Cu: 0.16 ; Als: 0.027; Mo: 0.35; Sn: 0.01; Sb: 0.008; Ti: 0.01; Ca: 0.002; [O]: 0.0020; [H]: 0.00015;

[0065] Adopt the metallurgical method of 100-ton DC electric arc furnace eccentric bottom tapping, 100-ton ladle refining outside the furnace, and 100-ton tank-type vacuum degassing method to obtain the alloy steel with the above composition, pour it into a 13.2-ton polygonal steel ingot, and then hot send it to Furnace in a forge. The large steel ingot is kept at 500°C for 5 hours, heated for 7 hours to 1190°C, and held for 3 hours. The steel ingot is hot-pressed on a 4,000-ton fast forging machine to form a Φ670mm round bar; : keep warm at 400°C for 2 hours, with a heating rate of 100°C / h, keep at 870°C for 8 hours, cool down to 350°C to 400°C and hold for 8 hours, then raise the temperature at a rate of 100°...

Embodiment 2

[0069] The weight percent of the alloy steel in Example 2 is: C: 0.18; Si: 0.10; Mn: 0.54; Cr: 1.86; Ni: 1.83; P: 0.009; ; Sn: 0.01; Sb: 0.005; Ti: 0.01; Ca: 0.001; [O]: 0.0013; [H]: 0.0001;

[0070] Using the metallurgical method of 100-ton DC electric arc furnace eccentric bottom tapping, 100-ton ladle refining outside the furnace, and 100-ton tank-type vacuum degassing method to obtain the alloy steel with the above composition, pour it into a 5.9-ton polygonal steel ingot, and then hot send it to Furnace in a forge. The large steel ingot is kept at 510°C for 5 hours, heated for 7 hours to 1210°C, and held for 3 hours. The steel ingot is hot-pressed on a 2,000-ton fast forging machine to form a Φ250mm round bar; : keep warm at 420°C for 2 hours, the heating rate is 90°C / h, keep at 880°C for 8 hours, cool down to about 350°C-400°C and hold for 8 hours, then raise the temperature at a rate of 90°C / h to 680°C, keep warm After 55 hours, it was cooled to 250°C with the furnace...

Embodiment 3

[0073] The weight percent of the alloy steel in Example 3 is: C: 0.19; Si: 0.09; Mn: 0.50; Cr: 1.75; Ni: 1.75; P: 0.020; S: 0.004; Cu: 0.20; ; Sn: 0.02; Sb: 0.005; Ti: 0.007; Ca: 0.001; [O]: 0.0016; [H]: 0.0001;

[0074] Adopt the metallurgical method of 100-ton DC electric arc furnace eccentric bottom tapping, 100-ton ladle refining outside the furnace, and 100-ton tank-type vacuum degassing method to obtain the alloy steel with the above composition, pour it into a 3.7-ton polygonal steel ingot, and then hot send it to Furnace in a forge. The large steel ingot is kept at 520°C for 5 hours, heated for 7 hours to 1200°C, and held for 3 hours. The steel ingot is processed into a Φ320mm round bar by hot pressing on a 2,000-ton fast forging machine; : Keep warm at 500°C for 2 hours with a heating rate of 80°C / h, heat at 890°C for 8 hours, cool down to 350°C to 400°C and hold for 8 hours, then raise the temperature to 690°C at a rate of 80°C / h. Keep warm for 58 hours, then cool ...

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Abstract

The invention discloses an alloy steel for gears. The weight percentage of the chemical compositions is that: carbon of 0.16 to 0.19 percent; silicon of less than or equal to 0.12 percent; manganese of 0.50 to 0.60 percent; chromium of 1.75 to 1.90 percent; nickel of 1.75 to 1.90 percent; phosphorus of less than or equal to 0.020 percent; sulfur of less than or equal to 0.015; copper of less than or equal to 0.20 percent; aluminum of 0.015 to 0.040 percent; molybdenum of 0.15 to 0.35 percent; tin of less than or equal to 0.020 percent; [oxygen] of less than or equal to 0.002 percent; [nitrogen] of 0.006 to 0.018 percent; [hydrogen] of less than or equal to 0.00015; stibium of less than or equal to 0.008 percent; titanium of less than or equal to 0.01 percent; calcium of less than or equal to 0.0020 percent; and the remainder is iron. The preparation method comprises hydrogen diffusion annealing procedures. The invention is made a carbonization treatment for 16 hours under the same carbonization condition, so the invention has small internal oxidation inclination; the invention has high contact fatigue strength and bending fatigue strength, and is suitable for the gears with the modulus of more than 10.

Description

technical field [0001] The invention relates to an alloy steel for gears, in particular to a large modulus carburized gear steel. Background technique [0002] Gear steel is an alloy structural steel used to make gears. Traction gear, as an important part in the traction drive of electric locomotive and electric drive diesel locomotive, transmits the torque generated by the traction motor, and bears the dynamic load generated by the impact from the line and the vibration of its own shafting. With the increase of motor single-axis power and locomotive speed, the torque and dynamic load transmitted by gears increase, and the service conditions of gears are also more severe. [0003] The load capacity and service life of traction gears are the most important performance parameters of gear steels. The direct indicators that characterize this performance are the contact fatigue strength of the gear tooth surface, the bending fatigue strength of the tooth root, and the ability o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/50C21D1/26C21D9/32C21D11/00C22C33/04C21C7/00F16H55/06
Inventor 黄泽民胡俊辉刘湘江范文杰
Owner BAOSTEEL SPECIAL STEEL CO LTD
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