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A method for preparing a nano-sized low-alloy heat-resistant high-strength steel mold

A low-alloy steel, nano-technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem of thin infiltration layer, etc., and achieve the effect of clean working environment, low cost and beautiful appearance

Inactive Publication Date: 2017-10-03
SHANGHAI HAN MOLDING SHAPE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional QPQ treatment technology has a thin permeated layer, which cannot meet the needs of workpieces that are subject to friction and wear and require good corrosion resistance.

Method used

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  • A method for preparing a nano-sized low-alloy heat-resistant high-strength steel mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing a nano-sized low-alloy heat-resistant high-strength steel mold, comprising the following steps:

[0042] (1) Smelting, pouring and rolling the mold raw materials in sequence to obtain low-alloy steel;

[0043] a. Smelting and pouring: The mold raw materials are firstly smelted in an electric arc furnace, and then the ladle RH treatment and LF treatment are carried out. During the ladle refining, argon blowing is carried out at a pressure of 4 atm for 10 minutes to facilitate the floating and removal of impurities;

[0044] b. Rolling: including soaking treatment, rolling and cooling, wherein soaking treatment is soaking in a heating furnace at 1100°C for 5 hours, the rolling start temperature is 1000°C, the final rolling temperature is 860°C, the rolling speed is 4m / s, the cooling rate is 6°C / s, and the final temperature after cooling is 660°C.

[0045] (2) processing the low-alloy steel obtained in step (1) into a block low-alloy steel mold of 4...

Embodiment 2

[0056] Substantially the same as Example 1, the difference is only: the adjustment salt of nitriding treatment in the described step (3) is made up of the raw material of following weight portion: CO(NH 2 ) 2 20 parts, Na 2 CO 3 12 copies, K 2 CO 3 10 copies, Li 2 CO 3 5 parts, KCl 15 parts, KCNO 35 parts, La 2 (CO 3 ) 3 3 parts, Nd 2 (CO 3 ) 3 3 copies. Obtain the preparation method of the nano-sized low-alloy heat-resistant high-strength steel mold of embodiment 2.

Embodiment 3

[0058] Substantially the same as Example 1, the difference is only: the adjustment salt of nitriding treatment in the described step (3) is made up of the raw material of following weight portion: CO(NH 2 ) 2 20 parts, Na 2 CO 3 12 copies, K 2 CO 3 10 copies, Li 2 CO 3 5 parts, KCl 15 parts, KCNO 35 parts, La 2 (CO 3 ) 3 3 copies, Sm 2 (CO 3 ) 3 3 copies. Obtain the preparation method of the nano-sized low-alloy heat-resistant high-strength steel mold of embodiment 3.

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Abstract

The invention discloses a preparation method of a nanocrystallized low-alloy steel mould with heat resistance and high strength. The preparation method comprises the following steps of (1) sequentially smelting, pouring and rolling a mould raw material to obtain low-alloy steel; (2) processing the low-alloy steel to obtain a low-alloy steel mould; and (3) sequentially carrying out nanocrystallization treatment, nitridation treatment, oxidization treatment and oil impregnation treatment on the low-alloy steel mould to obtain the surface-nanocrystallized low-alloy steel mould. The mould raw material in the step (1) is prepared from the following raw materials in percentage by mass: 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, 0.002-0.008% of P, 0.002-0.008% of S and the balance of Fe. The preparation method has the characteristics of simple process, low cost, energy saving, environmental protection, no pollution, clean working environment, attractive appearance and the like; and determined by the environmental protection department, all environmental protection indexes meet the national standard, and meanwhile all the wear resistance, corrosion resistance and mechanical properties including hardness and strength on a metal surface are greatly improved.

Description

technical field [0001] The invention relates to the technical field of alloy steel moulds, in particular to a method for preparing a nano-sized low-alloy heat-resistant high-strength steel mould. Background technique [0002] The social needs and technological development in the 20th century formed the current high-strength low-alloy steel, alloy structural steel, ultra-high-strength steel, stainless corrosion-resistant steel, heat-resistant steel, tool steel, mold steel, bearing steel and other alloy steel varieties . After entering the 21st century, high-rise buildings, deep underground and marine facilities, long-span heavy-duty bridges, light energy-saving vehicles, oil exploration and long-distance oil and gas transmission pipelines, military ships, aerospace vehicles, high-speed railway facilities, energy facilities, etc. Various sectors require new alloy steels with high performance, long service life and low cost. The development status of alloy steel can be descri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/08C22C38/12C21D7/04C23C8/58
CPCC21D7/04C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18C23C8/58
Inventor 陈斌张荣福印玲赵亚红陆一鸣
Owner SHANGHAI HAN MOLDING SHAPE CO LTD