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A kind of production method of cold working die steel

A technology of cold-working die steel and production methods, which is applied in temperature control, metal rolling, etc., can solve problems such as complex process, high production cost, and low billet rate, and achieve simplified production process, good physical and chemical properties, and improved cost. The effect of billet rate

Active Publication Date: 2017-01-18
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of complex process, high production cost and low billet forming rate in the method for producing cold work die steel in the prior art, and provide a kind of mold steel with simple process, low production cost, good physical and chemical properties and high billet forming rate. Production method of cold work die steel

Method used

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  • A kind of production method of cold working die steel
  • A kind of production method of cold working die steel
  • A kind of production method of cold working die steel

Examples

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preparation example Construction

[0018] In the present invention, the preparation method of the electric furnace steel ingot can adopt conventional methods in the art. For example, the preparation method of the electric furnace steel ingot may include: primary smelting raw and auxiliary materials such as scrap steel and alloys in an electric furnace to obtain molten steel, tapping the molten steel into a ladle, and performing pre-deoxidation on the molten steel during the tapping process Alloying and carburizing, followed by alloy fine-tuning and temperature adjustment in the LF refining furnace, and then vacuum refining, and the resulting molten steel is cast into shape.

[0019] In the present invention, in the electric furnace steel ingot, the content of carbon may be 1.47-1.70% by weight, and the content of chromium may be 11.00-12.50% by weight. The content of carbon and chromium in the electric furnace steel ingot can be adjusted by controlling the addition amount of carburizer and alloy in the step of ...

Embodiment approach

[0034]According to an embodiment of the present invention, when the cold working die steel is Cr12MoV steel, and the section size is: square billet≤150mm, slab thickness≤90mm and width≤630mm, the method may also include step (2) The obtained steel slab is subjected to slow cooling treatment. During the slow cooling treatment, the temperature at which the steel slab is put into the pit and into the hood can be ≥ 650°C.

[0035] According to one embodiment of the present invention, when the cold working die steel is Cr12 steel, Cr12MoV steel or Cr12Mo1V1 steel, and the section size is: billet>150mm, slab thickness>90mm and width>630mm, the method can also be It includes annealing the steel slab obtained in step (2), the holding temperature of the annealing treatment can be 870±10°C, and the holding time can be 6h; preferably, the method can also include annealing the steel slab before the annealing treatment Slow cooling treatment is carried out. During the slow cooling treatmen...

Embodiment 1

[0040] This embodiment is used to illustrate the method for producing cold work die steel provided by the present invention

[0041] The electric furnace steel ingot prepared by the VOD refining furnace is sent with a mold and a cap. The steel ingot is a Cr12 steel ingot, and then the electric furnace steel ingot is sequentially removed from the cap and demoulding, furnace-loaded and heated, and the total time of controlling the cap-removal and furnace-loading process is 35 minutes, after the implementation of the furnace and before the implementation of the heating, the surface temperature of the steel ingot is 850-880 ° C, the steel ingot is heated in the soaking furnace, and the heating is performed for a period of time, and the heating rate is 400 ° C / h; The heating temperature is 1180°C, and the holding time is 90 minutes; the second heating stage, the heating rate is 450°C / h; the second holding stage, the holding temperature is 1210°C, and the holding time is 120 minute...

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Abstract

The invention discloses a production method of cold work die steel. The method includes the following steps: (1) subjecting electric furnace steel ingots to mould capped hot charging prior to uncapping, stripping, charging and heating in sequence; (2) subjecting the heated steel ingot to blooming and cogging, wherein porous multi-pass reversing rolling is adopted in the blooming and cogging process. By the production method of the cold work die steel, the production process can be simplified, production cost is lowered, and physical and chemical properties and product billet yield of the cold work die steel are heightened.

Description

technical field [0001] The invention relates to a production method of cold working die steel. Background technique [0002] Since the content of carbon and chromium in Cr12 cold work die steel is very high, and it also contains a small amount of molybdenum and vanadium, it has a large deformation resistance and a narrow deformation temperature range when producing billets. The above raw material characteristics make the blanking method subject to certain restrictions. At present, the commonly used domestic cold work die steel blanking method is mostly to send the annealed steel ingot to the forging plant for forging blanking. This method generally needs to go through Multi-fire forging can be completed. However, the multi-fire forging method will often cause uneven temperature of the steel ingot, resulting in cracks on the surface of the steel ingot and a reduction in the billet rate. Therefore, it can be seen that the production of cold-work die steel by forging method has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B37/74
CPCB21B1/46B21B37/74
Inventor 段丕荣段辉春罗定祥韩逊陈攀全江胜利
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL