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Highly-polished prehardened die steel, and preparation method thereof

A preparation process and pre-hardening technology, which is applied in the field of alloy steel, can solve the problems of strict polishing process requirements, many mold manufacturing processes, and increased manufacturing costs, and achieve high polishing performance, good polishing performance, and the effect of improving grain refinement

Inactive Publication Date: 2018-01-16
ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, NAK80 steel has poor plasticity, is not suitable for molds with complex or deep cavities, and has strict requirements on the polishing process
However, 1.2343 steel is difficult to machine, and the mold manufacturing process is multi-cycle and long, which will greatly increase the manufacturing cost of these automotive products

Method used

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  • Highly-polished prehardened die steel, and preparation method thereof
  • Highly-polished prehardened die steel, and preparation method thereof
  • Highly-polished prehardened die steel, and preparation method thereof

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Embodiment

[0026] In this embodiment, the components and mass percentages of the highly polished pre-hardened mold steel are as follows: C0.25%, Si 0.15%, Mn 1.60%, Cr 1.70%, Ni 0.90%, Mo 0.50%, V 0.07%, P 0.012%, S 0.002%, Nb 0.03%, Fe balance.

[0027] Adopt the material in this embodiment to produce the technological process and the step of high polished pre-hardened die steel as follows:

[0028] (1) Smelting: According to the composition and mass percentage of high-polished pre-hardened mold steel, batching, electric arc furnace smelting and refining, then vacuum degassing and casting, and finally demoulding and hot delivery to forging heating furnace;

[0029] (2) High-temperature diffusion heat treatment: the steel ingot is heated in stages in the forging furnace, that is, isothermal at 600°C, 800°C, and 1100°C respectively, and finally heated to 1180-1250°C, and the holding time is 10-20 hours after reaching the uniform temperature ;

[0030] (3) Forging hot processing: Cool th...

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Abstract

The invention relates to a highly-polished prehardened die steel, and a preparation method thereof. The highly-polished prehardened die steel is composed of, by mass, 0.21 to 0.25% of C, Si<=0.30%, 1.40 to 2.00% of Mn, 1.30 to 1.70% of Cr, 0.60 to 1.00% of Ni, 0.40 to 0.60% of Mo, V<=0.10%, P<0.015%, S<0.005%, 0.02 to 0.04% of Nb, and the balance Fe. The preparation method comprises following steps: material blending, smelting, casting, and hot charging; high temperature diffusion heat treatment, multi-directional forging heat processing, after-forging heat treatment, and sawing; and hardeningand tempering heat treatment. The hardness of the obtained tempered martensite structure ranges from 38 to 42HRC. The advantages of the highly-polished prehardened die steel are that: cost is low, hardenability and hardness are high, and polishing properties and cleavage line etching performance are excellent.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, relates to a plastic mold steel, in particular to a highly polished pre-hardened mold steel and a preparation process thereof. Background technique [0002] With the rapid development of my country's manufacturing industry, the amount of mold used is increasing, and the performance requirements of mold materials are also getting higher and higher, especially high polishing performance and machining performance. Molds are used in the production of automobile manufacturing, home appliances, electronic communications, etc. These molds require high polishing performance and processing performance. At present, most of them are made of Japanese Datong NAK80 steel or 1.2343 steel and other materials to manufacture these molds. However, NAK80 steel has poor plasticity, is not suitable for molds with complex or deep cavities, and has strict requirements on the polishing process. However, 1.2343 stee...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/44C22C38/46C22C38/48C22C38/02C22C38/04B23P15/24
Inventor 周青春徐卫明顾金才钱强葛建辉罗小芳赵博伟丁勇宋小亮
Owner ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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