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Control Method of Inclusions in Cold Work Die Steel

A technology of cold-work die steel and control method, which is applied in the field of iron and steel metallurgy, can solve the problems of lack of control methods for cold-work die steel inclusions, and achieve good economic and social benefits

Active Publication Date: 2021-03-23
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: there is a lack of a control method for cold-work die steel inclusions in the existing market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 Adopting the method of the present invention to control cold working die steel inclusions

[0034] The type of steel produced is Cr12MoV, and the specific inclusion control methods are as follows:

[0035] It is produced by electric furnace smelting, LF furnace refining, VD furnace refining, die casting, forging and rolling;

[0036] When refining in the VD furnace, control the soft blowing time to 35 minutes. After the soft blowing is completed, break the space. 2 minutes before breaking the space, adjust the blowing Ar flow rate to 30L / min. It is 150L / min, and rare earth is added after breaking through; the addition amount is 20kg per furnace (each furnace contains 40 tons of molten steel).

[0037] Measure the temperature of molten steel and take [H] samples in time after breaking the void, [H] is 1.2ppm.

[0038] In the step of controlling the pouring temperature, before hanging the ladle, clean up the residue around the ladle, so that no residue fall...

Embodiment 2

[0042] Embodiment 2 Adopting the method of the present invention to control cold working die steel inclusions

[0043] The type of steel produced is Cr12MoV, and the specific inclusion control methods are as follows:

[0044] It is produced by electric furnace smelting, LF furnace refining, VD furnace refining, die casting, forging and rolling;

[0045] During refining in the VD furnace, the soft blowing time is controlled to be 40 minutes. After the soft blowing is completed, break the space. 2 minutes before breaking the space, adjust the blowing Ar flow rate to 25L / min. It is 140L / min, and rare earth is added after breaking through; the addition amount is 20kg per furnace (each furnace contains 40 tons of molten steel).

[0046] Measure the temperature of the molten steel and take a [H] sample in time after breaking the void, and the [H] is 1.1ppm.

[0047] In the step of controlling the pouring temperature, before hanging the ladle, clean up the residue around the ladle,...

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PUM

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a cold-work die steel impurity control method. In order to solve the problem that a special control method for cold-work die steel impurities is absent on the market, the invention provides a cold-work die steel impurity control method. The cold-work die steel impurity control method comprises the following steps of: electric furnace smelting, LF furnace refining, VD furnace refining, die-casting, forging and rolling, wherein in the VD furnace refining process, rare earth of (0.5 kg+ / -0.05 kg) / ton of steel is added after VD vacuum-breaking, and soft-blowing time is controlled to be 30-50 minutes; and in the die-casting process, a casting temperature is controlled to be 1450-1470 DEG C. Rare earth is added during VD furnace refining, the soft-blowing time is precisely controlled, and the casting temperature is precisely controlled at a die-casting stage, so that impurity content in the cold-work die steel is reduced, and meets A-process inspection and rating of the national standards GB / T10561-2005; and the cold-work die steel impurity control method is especially suitable for controllingCr12-series steel impurity, and is suitable for being popularized and used.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for controlling inclusions in cold-work die steel. Background technique [0002] The most widely used cold work die steel materials on the existing market are mainly high-carbon and high-chromium cold work die steels Cr12, Crl2MoV, etc., which have high hardenability, hardenability, wear resistance, and good high-temperature oxidation resistance. Therefore, as a general-purpose cold work die steel material, it is widely used in the manufacture of cold work dies for various purposes, such as punching dies with complex shapes, cold extrusion dies, rolling thread wheels, cold shear knives and precision measuring tools. [0003] Inclusions in cold work die steel have a great influence on its properties. The high content of inclusions in cold work die steel can easily cause quality problems such as pits and fatigue fractures in cold work die ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C5/52C21C7/10C21C7/072C21C7/00
CPCC21C5/52C21C7/0006C21C7/072C21C7/10C22C33/04Y02P10/20
Inventor 杜思敏吴铖川林发驹赵中清
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD