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Preparation method of surface nanocrystallization low-alloy steel mold

A low-alloy steel and nano-technology, which is applied in the field of preparation of low-alloy steel moulds, which can solve the problems of shallow compound layer depth, inability to withstand high-speed loads, and inability to withstand heavy loads, so as to reduce types and heat resistance and the effect of improving corrosion resistance and increasing thickness

Inactive Publication Date: 2015-10-28
SHANGHAI HAN MOLDING SHAPE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing ordinary nitriding technology has great limitations in application, the reason is that the depth of the compound layer is too shallow to bear heavy loads, high-speed loads, and large wear

Method used

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  • Preparation method of surface nanocrystallization low-alloy steel mold
  • Preparation method of surface nanocrystallization low-alloy steel mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the surface nanometerization low-alloy steel mold of embodiment 1 according to the following steps:

[0033] (1) In terms of weight percentage, prepare low alloy steel with the following components: C 0.09, Cr 1.45, Si 0.40, Mn 0.33, Mo 0.17, Ni 0.15, Nb 0.05, Pd 0.15, P 0.002, S 0.002, The balance is Fe and unavoidable impurities;

[0034] (11) Smelting and pouring: Carry out the electric arc furnace primary smelting, ladle RH treatment and LF treatment in sequence, and control the molten steel to meet the defined chemical composition before pouring. During the ladle refining, argon blowing is carried out at a pressure above 3 atm for at least 5 minutes to effectively Facilitate the floating and removal of impurities;

[0035](12) Rolling: including soaking treatment, rolling and cooling, wherein soaking treatment is soaking in a heating furnace at 1150°C for about 5 hours, the starting temperature of rolling is 1000°C, the final rolling temperature is 850°C, ...

Embodiment 2

[0047] According to the method described in Example 1, but the base salt described in the step (32) is the following components by weight: 100 parts of potassium cyanate, Ce 2 CO 3 3 parts, ZrO 2 3 copies. Obtain the surface nanometerized low-alloy steel mold of embodiment 2.

Embodiment 3

[0049] According to the method described in Example 1, but the base salt described in the step (32) is the following components by weight: 100 parts of potassium cyanate, Ce 2 CO 3 3 parts, CeO 2 3 copies. Obtain the surface nanometerized low-alloy steel mold of embodiment 3.

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Abstract

The present invention relates to a preparation method of a surface nanocrystallization low-alloy steel mold. The method comprises the steps of: (1) preparing low-alloy steel from the following components in weight percent: 0.08-0.12% of C, 1.20-1.45% of Cr, 0.40-0.45% of Si, 0.33-0.38% of Mn, 0.17-0.24% of Mo, 0.05-0.15% of Ni, 0.05-0.08% of Nb, 0.15-0.35% of Pd, no more than 0.010% of P, no more than 0.010% of S, and the balance of Fe and unavoidable impurities; (2) processing the low-alloy steel obtained in the step (1) into desired size and shape, so as to prepare the low-alloy steel mold; and (3) codcnuting to surface nanocrystallization on the low-alloy steel mold prepared in step (2). The surface nanocrystallization low-alloy steel mold provided by the present invention has improved heat resistance and corrosion resistance, reduces the species of alloy, and realizes simple and easily controlled impurities and significantly increased thickness of effective permeability layer of nitride.

Description

technical field [0001] The invention relates to a method for preparing an alloy mold, in particular to a method for preparing a low-alloy steel mold with nanometer surface. Background technique [0002] Under high temperature conditions (usually 0.3 to 0.5 times the melting point of the material), the steel with oxidation resistance, sufficient high temperature strength and good heat resistance is called heat-resistant steel, and the most representative of heat-resistant steel One is low-alloy steel. For example, 15CrMo in my country is a typical low-alloy steel. 15CrMo is widely used in boilers, petrochemicals, coal conversion, and steam turbines because of its good heat resistance, mechanical properties, and corrosion resistance. Pipelines, containers, parts, etc. of large-scale equipment with harsh service conditions and complex corrosive media such as wheel cylinders, thermal power plants, and nuclear power plants. [0003] General 15CrMo chemical composition (mass fracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48
Inventor 陈斌张荣福印玲赵亚红陆一鸣
Owner SHANGHAI HAN MOLDING SHAPE CO LTD
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