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Low-narrow-hardenability belt 20CrMnTiH gear steel, bar and manufacturing method of low-narrow-hardenability belt 20CrMnTiH gear steel

A technology of hardenability belt and manufacturing method, which is applied in the field of steel, bar and its manufacturing, can solve the problems such as the difficulty of hardenability belt, achieve good promotion prospects and practical value, stable heat treatment quality, and long service life Effect

Pending Publication Date: 2022-03-18
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because 20CrMnTiH steel has its own special steel characteristics, the control of its hardenability bandwidth is more difficult than other gear steels

Method used

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  • Low-narrow-hardenability belt 20CrMnTiH gear steel, bar and manufacturing method of low-narrow-hardenability belt 20CrMnTiH gear steel
  • Low-narrow-hardenability belt 20CrMnTiH gear steel, bar and manufacturing method of low-narrow-hardenability belt 20CrMnTiH gear steel
  • Low-narrow-hardenability belt 20CrMnTiH gear steel, bar and manufacturing method of low-narrow-hardenability belt 20CrMnTiH gear steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1-6 and comparative example 1

[0059] The bar of embodiment 1-6 all adopts following steps to make:

[0060] (1) Smelting and casting according to the chemical composition shown in Table 1: use electric furnace or converter for smelting, and cast into continuous casting slabs or steel ingots; in the casting process, die casting or continuous casting can be used.

[0061] (2) Heating: Control the heating temperature to 1050-1250°C.

[0062] (3) Forging or rolling: Control the final rolling or final forging temperature to ≥800°C. Among them, if forging is performed, the final dimensions such as forging can be directly forged during the forging process. If rolled, during the rolling process, the billet can be rolled directly to the final specification, or the billet can be rolled to the specified intermediate billet size, and then heated and rolled to the final finished product size.

[0063] (4) Quenching + tempering: The austenitizing temperature for quenching is 840-1050°C, and oil quenching is used after...

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Abstract

The invention discloses low-narrow hardenability band 20CrMnTiH gear steel which comprises the following chemical elements in percentage by mass besides Fe: 0.17%-0.20% of C, 0.17%-0.25% of Si, 0.8%-0.85% of Mn, 1%-1.1% of Cr, 0.02%-0.03% of Al, 0.04%-0.05% of Ti, 0.009%-0.014% of N, less than or equal to 0.02% of Mo, less than or equal to 0.03% of Ni, less than or equal to 0.05% of Cu, less than or equal to 0.02% of Nb, less than or equal to 0.01% of V, less than or equal to 0.004% of Ca and less than or equal to 0.0003% of B. In addition, the invention further discloses a bar material prepared from the low narrow hardenability belt 20CrMnTiH gear steel. In addition, the invention also discloses a manufacturing method of the bar, which comprises the following steps: (1) smelting and casting; (2) heating; (3) forging or rolling; (4) quenching and tempering, wherein the austenitizing temperature of quenching is 840-1050 DEG C, and oil quenching is adopted after austenitizing; the tempering temperature is 180-220 DEG C, and air cooling or water cooling is carried out after tempering.

Description

technical field [0001] The invention relates to a steel material, a rod and a manufacturing method thereof, in particular to a 20CrMnTiH gear steel, a rod and a manufacturing method thereof. Background technique [0002] Gears are very important transmission parts in automobiles, engineering machinery and machinery manufacturing. During the operation of transmitting power and changing speed, there is both rolling and sliding between the meshing tooth surfaces of the gears, and the roots of the gear teeth are also subjected to alternating bending stress. [0003] In recent years, with the development of gear steel application fields towards high speed, heavy load, precision and low noise, the market requires gears not only to have good strength, toughness and wear resistance, but also to withstand impact, bending and contact stress well. It also needs to have excellent properties such as small heat treatment deformation and high dimensional accuracy. This puts forward highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C33/04C21D8/06C21D1/18
CPCC22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C33/04C21D8/065C21D1/185C21D2211/001C21D2211/002C21D2211/008
Inventor 王维赵四新高加强章军
Owner BAOSHAN IRON & STEEL CO LTD
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