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Boron microalloyed die steel and preparation process thereof

A technology of boron microalloying and preparation process, which is applied in the field of alloyed mold steel, can solve the problems of strict polishing process requirements, many mold manufacturing processes, and increased manufacturing costs, and achieve high polishing performance, low alloy cost, and improved hardenability sexual effect

Inactive Publication Date: 2016-11-09
RUGAO HONGMAO HEAVY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Boron microalloyed die steel and preparation process thereof
  • Boron microalloyed die steel and preparation process thereof
  • Boron microalloyed die steel and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, the alloy composition and weight percentage of the boron microalloyed die steel are as follows:

[0030] C: 0.10%, Si: 0.10%, Mn: 1.20%, Cr: 1.10%, Ni: 0.10%, Mo: 0.20%, V: 0.08%, P: 0.015%, S: 0.002%, B: 0.005%, Fe is the balance.

[0031] In this embodiment, the specific steps of the preparation process of boron microalloyed die steel are as follows:

[0032] (1) Electric furnace smelting: smelting in an electric arc furnace according to the above alloy element ratio, then refining outside the furnace and vacuum degassing, casting into steel ingots and sending them to the forging heating furnace;

[0033] (2) High-temperature diffusion heat treatment: the heating temperature is 1180-1250°C, and the holding time is 10-20 hours after reaching the uniform temperature;

[0034] (3) Forging hot processing: the steel ingot that has undergone high-temperature diffusion heat treatment is cooled to a temperature range of 900-1200 ° C for multi-directional fo...

Embodiment 2

[0039] In this example, the alloy composition and weight percentage of the boron microalloyed die steel are as follows:

[0040] C: 0.20%, Si: 0.20%, Mn: 1.60%, Cr: 1.50%, Ni: 0.30%, Mo: 0.35%, V: 0.10%, P: 0.010%, S: 0.005%, B: 0.01%, Fe is the balance.

[0041] In this embodiment, the specific steps of the preparation process of boron microalloyed die steel are as follows:

[0042] (1) Electric furnace smelting: smelting in an electric arc furnace according to the above alloy element ratio, then refining outside the furnace and vacuum degassing, casting into steel ingots and sending them to the forging heating furnace;

[0043] (2) High-temperature diffusion heat treatment: the heating temperature is 1180-1250°C, and the holding time is 10-20 hours after reaching the uniform temperature;

[0044] (3) Forging hot processing: the steel ingot that has undergone high-temperature diffusion heat treatment is cooled to a temperature range of 900-1200 ° C for multi-directional for...

Embodiment 3

[0049] In this example, the alloy composition and weight percentage of the boron microalloyed die steel are as follows:

[0050] C: 0.15%, Si: 0.15%, Mn: 1.40%, Cr: 1.20%, Ni: 0.20%, Mo: 0.30%, V: 0.09%, P: 0.012%, S: 0.003%, B: 0.006%, Fe is the balance.

[0051] In this embodiment, the specific steps of the preparation process of boron microalloyed die steel are as follows:

[0052] (1) Electric furnace smelting: smelting in an electric arc furnace according to the above alloy element ratio, then refining outside the furnace and vacuum degassing, casting into steel ingots and sending them to the forging heating furnace;

[0053] (2) High-temperature diffusion heat treatment: the heating temperature is 1180-1250°C, and the holding time is 10-20 hours after reaching the uniform temperature;

[0054] (3) Forging hot processing: the steel ingot that has undergone high-temperature diffusion heat treatment is cooled to a temperature range of 900-1200 ° C for multi-directional fo...

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Abstract

The invention relates to boron microalloyed die steel and a preparation process thereof and belongs to the technical field of alloy steel preparation processes. The main alloy elements in alloy chemical components of the die steel comprise, by mass, 0-0.20% of C, 0-0.20% of Si, 1.20-1.60 of Mn, 1.10-1.50% of Cr, 0-0.30% of Ni, 0.20-0.35% of Mo, 0-0.10% of V, less than 0.015% of P, less than 0.005% of S, 0.005-0.01% of B, and the balance Fe. The preparation process of the steel includes the following steps of conducting burdening, smelting, casting and hot delivery; conducting high temperature diffusion heat treatment, multi-directional forging hot working and post-forging hydrogen diffusion tempering treatment; and finally conducting quenching-and-tempering heat treatment so as to obtain a tempered martensite structure with the hardness being 32-38 HRC. The boron microalloyed die steel and the preparation process thereof have the advantages that the prepared die steel has low cost, high hardenability, high hardness, high polishing performance and high skin grain etching performance.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and relates to an alloyed die steel, in particular to [0002] A boron microalloyed die steel and a preparation process thereof. Background technique [0003] 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/04C22C38/02C22C38/08C22C38/12C21D1/25C21D1/26C21D6/00
CPCC22C38/32C21D1/25C21D1/26C21D6/005C21D2211/008C22C38/02C22C38/04C22C38/08C22C38/12
Inventor 周青春徐卫明顾金才葛建辉钱强赵博伟丁勇王小飞宋小亮
Owner RUGAO HONGMAO HEAVY FORGING
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