Rolling method capable of reducing as-rolled hardness of 42CrMo steel

A hardness, steel rolling technology, applied in the field of steel rolling, can solve problems such as easy occurrence of shear cracks, and achieve the effect of grain refinement and improvement of organizational uniformity

Active Publication Date: 2017-02-22
XINING SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to improve the processing efficiency, most of the 42CrMo steel is changed from band saw blanking t...

Method used

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  • Rolling method capable of reducing as-rolled hardness of 42CrMo steel
  • Rolling method capable of reducing as-rolled hardness of 42CrMo steel
  • Rolling method capable of reducing as-rolled hardness of 42CrMo steel

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0027] A kind of rolling method that reduces 42CrMo steel as-rolled hardness, comprises the following steps:

[0028] (1) Heat treatment of the blank of 42CrMo steel

[0029] (11) The billet of 42CrMo steel (250×280mm continuous casting billet) was heated from room temperature to 1180°C at a rate of 600°C / h and kept for 1.5h;

[0030] (12) The blank of 42CrMo steel in the step (1) is adjusted to 1160 DEG C with the speed of 150 DEG C / h, and after uniform temperature 1h, it is released from the furnace to obtain the blank of 42CrMo steel after treatment;

[0031] (2) Rolled billet

[0032] (21) Rough rolling

[0033] like figure 1 Shown, the billet of the processed 42CrMo steel that step (12) obtains is passed through seven stands of two-roll rolling mill continuous rolling ( figure 1 Each figure in the figure represents the cross-sectional schematic diagram of the billet after passing through a two-roll mill), the rolled 42CrMo steel material is a rough rolling prepara...

specific Embodiment 2

[0042] A kind of rolling method that reduces 42CrMo steel as-rolled hardness, comprises the following steps:

[0043] (1) Heat treatment of the blank of 42CrMo steel

[0044] (11) Heat the blank of 42CrMo steel from room temperature to 1160°C at a rate of 600°C / h and keep it warm for 2h;

[0045] (12) adjusting the temperature of the blank of 42CrMo steel in the step (1) to 1150° C. at a speed of 150° C. / h, taking out the furnace after 1 hour of uniform temperature, and obtaining the blank of 42CrMo steel after treatment;

[0046] (2) Rolled billet

[0047] (21) Rough rolling

[0048] The billet of the processed 42CrMo steel that step (12) obtains is adopted two-roller continuous rolling rolling, and the 42CrMo steel stock of rolling is rough rolling preparatory round, will be the billet of rough rolling preparatory round 42CrMo steel through standing in 20 seconds After rewarming, the temperature is controlled at 1000°C;

[0049] (22) Intermediate rolling

[0050] Th...

specific Embodiment 3

[0057] A kind of rolling method that reduces 42CrMo steel as-rolled hardness, comprises the following steps:

[0058] (1) Heat treatment of the blank of 42CrMo steel

[0059] (11) Heat the blank of 42CrMo steel from room temperature to 1200°C at a rate of 600°C / h and keep it warm for 1h;

[0060] (12) The blank of 42CrMo steel in the step (1) is adjusted to 1180 DEG C with the speed of 150 DEG C / h, and after uniform temperature 1h, it is released from the furnace, so as to obtain the blank of 42CrMo steel after treatment;

[0061] (2) Rolled billet

[0062] (21) Rough rolling

[0063] The billet of the processed 42CrMo steel that step (12) obtains is adopted two-roller continuous rolling rolling, and the 42CrMo steel stock of rolling is rough rolling preparatory round, will be the billet of rough rolling preparatory round 42CrMo steel through 40 seconds standstill After rewarming, the temperature is controlled at 1050°C;

[0064] (22) Intermediate rolling

[0065]The ...

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Abstract

The invention relates to a rolling method capable of reducing an as-rolled hardness of 42CrMo steel. The rolling method comprises the following steps: (1) carrying out heating treatment on a blank of the 42CrMo steel; and (2) sequentially carrying out rough rolling, medium rolling and finish rolling on the treated blank of the 42CrMo steel to obtain the 42CrMo steel with a low as-rolled hardness. The rolling method capable of reducing the as-rolled hardness of the 42CrMo steel, which is disclosed by the invention, has the following beneficial effects: 1. a low finish rolling temperature is controlled, a high pressure stress on the core part of the steel is achieved during a rolling process, structure uniformity is greatly improved, and grains are further refined; and 2. the finish rolling temperature is lowered to be approximate to an actual critical phase change point (Ar3), thus phase change of the 42CrMo steel from phase gamma to phase alpha is promoted, finally an as-rolled structure is a balanced ferrite and pearlite structure, and then the as-rolled hardness is reduced to HB230-250 from HB300.

Description

technical field [0001] The invention relates to a rolling method of steel, in particular to a rolling method for reducing the hardness of 42CrMo steel as rolled. Background technique [0002] 42CrMo steel is a medium carbon alloy steel widely used in auto parts, with high strength, high hardenability and good toughness. At present, in order to improve the processing efficiency, most of the 42CrMo steels are cut by band sawing instead of cutting by shearing, but the high hardness in the as-rolled state makes shear cracks prone to occur during the shearing process. Therefore, how to reduce the as-rolled hardness of 42CrMo steel has become an urgent problem to be solved. Contents of the invention [0003] Purpose of the invention: the present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the present invention discloses a rolling method for reducing the hardness of 42CrMo steel as-rolled. [0004] Technical solution: a rolli...

Claims

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Application Information

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IPC IPC(8): B21B37/74C21D8/06
CPCB21B37/74B21B2261/22C21D8/065C21D2211/005C21D2211/009
Inventor 肖磊磊陈列高建鹏付君张贵成金启邦姚英航
Owner XINING SPECIAL STEEL
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