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Preparation method for nano-crystallization low-alloy heat-resistant high-strength steel mould

A low-alloy steel and nano-technology, which is applied in the field of preparation of nano-alloy low-alloy heat-resistant and high-strength steel molds, can solve the problems of inability to withstand high-speed loads, shallow compound layer depth, and inability to withstand heavy loads, and achieves heat resistance and Improved corrosion resistance, reduced types, and increased thickness

Inactive Publication Date: 2015-09-30
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 for nano-crystallization low-alloy heat-resistant high-strength steel mould
  • Preparation method for nano-crystallization low-alloy heat-resistant high-strength steel mould

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the nano-sized low-alloy heat-resistant high-strength 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 0.30, Mn 0.33, Mo 0.17, Ni 0.15, Nb 0.05, V 0.15, Ti 0.0015, 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 rollin...

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. The nano-sized low-alloy heat-resistant high-strength steel mold of Example 2 was obtained.

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. The nano-sized low-alloy heat-resistant high-strength steel mold of Example 3 was obtained.

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Abstract

The invention relates to a preparation method for a nano-crystallization low-alloy heat-resistant high-strength steel mould. The preparation method comprises the following steps: (1) preparing low-alloy steel from the following components in percentage by weight: 0.09-0.15% of C, 1.35-1.55% of Cr, 0.22-0.28% 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 V, less than or equal to 0.010% of P, less than or equal to 0.010% of S and the balance of Fe and inevitable impurities; (2) processing the low-alloy steel obtained in the step (1) into a required dimension and a required shape, thereby obtaining a low-alloy steel mould; and (3) carrying out surface nanocrystallization treatment on the low-alloy steel mould prepared in the step (2). The nano-crystallization low-alloy heat-resistant high-strength steel mould prepared by the preparation method disclosed by the invention is improved in heat resistance and corrosion resistance; and meanwhile, the varieties of the alloys are reduced, the impurity components are simpler and easy to control, and a nitride effective penetrating layer is remarkably increased in thickness.

Description

technical field [0001] The invention relates to a method for preparing an alloy mould, in particular to a method for preparing a nano-sized low-alloy heat-resistant high-strength steel mould. 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 compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50B23P15/24
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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