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Process for forging round steel by using superfine chromium-molybdenum hot-work die steel

A hot work die steel, ultra-fine technology, applied in the field of hot work die steel forging

Active Publication Date: 2021-02-19
东莞市正一金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the size of chromium-molybdenum series hot work die steel forged round steel in the domestic and foreign die steel market has increased to Ф600mm~Ф800mm. With the increase of forged round steel size, only larger steel ingots and more Large forging and pressing ratio

Method used

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  • Process for forging round steel by using superfine chromium-molybdenum hot-work die steel
  • Process for forging round steel by using superfine chromium-molybdenum hot-work die steel
  • Process for forging round steel by using superfine chromium-molybdenum hot-work die steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The size and shape of the finished product is round steel Ф635mm.

[0039]⑴Adopt EAF+LF+VD+ESR method to smelt, LF furnace adopts white slag time for 32min; VD vacuum degree is not more than 0.67mbar, keep for 10min, pouring φ700mm round electrode rod, pouring temperature is 1537℃, electrode rod is sent for annealing in red. Using binary slag system CaF when electroslag remelting2:Al2O3= 70: 30, the constant fuse electric slag heavy melt voltage is controlled at 62V to 74V, and the weight is controlled at 15000A to 20000A, and the remelted fusion is controlled at 13.5 kg / min, and the electric slag melted ingot is φ1100mm electric slag. Ingots, the temperature of the electric slag ingot will be sent. The analysis results of the chemical composition of the electric slag ingot are shown in Table 1.

[0040]Table 1 Analysis of chemical composition analysis

[0041]

[0042](2) φ1100mm electroslastic preoperative high temperature diffusion treatment, diffusion temperature 1240 ° C ~ 1250 ° C...

Embodiment 2

[0053]The production of finished products is a round steel ф685mm.

[0054](1) EAF + LF + VD + ESR method smelting, the LF furnace is 31min; VD vacuum is not more than 0.67 mbar, remains 10 min, pouring φ700mm round electric pole, the casting temperature is 1541 ° C, the electrode rod is red to retreat. Electroslags use binary slag to use CAF2: Al2O3= 70: 30, the constant fuse electric slag heavy melt voltage is controlled at 62V to 74V, and the weight is controlled at 15000A to 20000A, and the remelted fusion is controlled at 13.5 kg / min, and the electric slag melted ingot is φ1100mm electric slag. Ingots, the temperature of the electric slag ingot will be sent. The results of the analysis of the chemical composition of the electric slag ingot are shown in Table 4.

[0055]Table 4 Chemical composition analysis results

[0056]

[0057](2) φ1100mm electroslastic preoperative high temperature diffusion treatment, diffusion temperature 1240 ° C ~ 1250 ° C diffusion time 45 h.

[0058](3) φ1100mm e...

Embodiment 3

[0068]The production of finished products is a round steel ф785 mm.

[0069](1) EAF + LF + VD + ESR method smelting, the LF furnace is 34min; VD vacuum is not greater than 0.67 mbar, remains 10 min, cast φ700mm round electric pole, the casting temperature is 1533 ° C, the electrode rod is red and retreat. Electroslags use binary slag to use CAF2: Al2O3= 70: 30, the constant fuse electric slag heavy melt voltage is controlled at 62V to 74V, and the weight is controlled at 15000A to 20000A, and the remelted fusion is controlled at 13.5 kg / min, and the electric slag melted ingot is φ1100mm electric slag. Ingots, the temperature of the electric slag ingot will be sent. The analysis results of the chemical composition analysis of the electric slag ingot are shown in Table 7.

[0070]Table 7 Analysis of chemical composition analysis

[0071]

[0072](2) φ1100mm electroslastic preoperative high temperature diffusion treatment, diffusion temperature 1240 ° C ~ 1250 ° C diffusion time 45 h.

[0073](3) φ...

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Abstract

The invention discloses a process for forging round steel by using superfine chromium-molybdenum hot-work die steel, and aims to solve the problem that the core structure and impact toughness of large-forged round steel meet the technical requirements by adopting a special superfine control technology. The purity of molten steel is improved by adopting an LF furnace white slag method and a VD degassing steelmaking process; the casting-state structure segregation of a large steel ingot and the hot working plasticity of steel are improved by controlling the electroslag remelting melting rate andperforming diffusion homogenization treatment before forging; carbide is crushed and the uniformity of the core microstructure is improved by adopting a multi-heating-number and multi-direction three-dimensional forging method for the large electroslag ingot; and after the finished product is subjected to heat treatment forging, water-air alternate quenching and isothermal spheroidizing annealingare directly carried out by utilizing waste heat, and the microstructure of the steel is uniformly refined. The manufactured phi 600 to phi 800mm superfine chromium-molybdenum hot-work die steel forged round steel reaches the NADCA#207 standard superior-quality technical level.

Description

Technical field[0001]The invention belongs to the field of hot work die steel forging, and specifically relates to a process for forging round steel of ultra-fine chromium-molybdenum series hot work die steel. The diameter of the round steel is Ф600mm~Ф800mm.Background technique[0002]Die steel is a special alloy steel. Commonly used die steels are generally divided into three categories according to their use and working conditions, namely cold work die steel, hot work die steel and plastic die steel. Hot work die steel is mainly used to manufacture dies for hot forming of high-temperature metal, such as hot forging dies and hot extrusion dies. The carbon content of this type of steel is generally 0.3% to 0.6%. The addition of alloy elements such as tungsten, molybdenum, chromium, vanadium to improve performance can be divided into chromium-molybdenum hot work die steel 4Cr5MoSiV1, etc., chromium tungsten hot work die steel 3Cr2W8V, 5Cr4W5Mo2V, etc. Chrome-molybdenum hot work die st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24B21J5/00C21D1/18C21D1/32C21D8/00C22B9/18C22C33/04
CPCB21J5/002C21D1/18C21D1/32C21D8/005C22B9/18C22C33/04C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 林国忠
Owner 东莞市正一金属制品有限公司
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