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A manufacturing process of hot work die steel forgings

A technology of hot work die steel and preparation process, which is applied in the direction of metal processing equipment, etc., can solve the problems of coarse quenched martensite and affect the strength and toughness of modules, and achieve grain refinement, less dendrite segregation, and clean steel Effect

Active Publication Date: 2018-10-19
山西同航特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inheritance of these structures will also cause grain inheritance again during the quenching and austenitization process of the final heat treatment, making the quenched martensite coarse and seriously affecting the strength and toughness of the module

Method used

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  • A manufacturing process of hot work die steel forgings
  • A manufacturing process of hot work die steel forgings
  • A manufacturing process of hot work die steel forgings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Used steel ingot chemical composition (wt%) is as follows:

[0063] 0.385C; 1.183Si; 0.333Mn; 0.014P; 0.003S; 5.045Cr;

[0064] The process is as follows:

[0065] (1) Smelting

[0066] First use 40t electric arc furnace for smelting, then use 40t submerged arc heating ladle refining furnace to refine and vacuum degassed molten steel to pour ￠300mm consumable electrode, and use ￠300 consumable electrode to melt ￠300mm in electroslag remelting furnace 720 / ￠760mm, electroslag remelting steel ingot weighing about 5t.

[0067] (2) forging

[0068] Raise the electroslag remelted ingot to 650°C at a heating rate of 50°C / h for the first preheating, keep it for 2 hours, then raise the temperature at a rate of 80°C / h to 810°C for the second preheating, and hold it for 2 hours , and then raised to 1210°C at a heating rate of 110°C / h, held for 14 hours for high-temperature diffusion, started forging at 1100°C, three upsetting and three pulling out, upsetting ratio = 2, total f...

Embodiment 2

[0077] Used steel ingot chemical composition (wt%) is as follows:

[0078] 0.401C; 1.137Si; 0.350Mn; 0.012P; 0.003S; 5.104Cr;

[0079] The process is as follows:

[0080] (1) Smelting

[0081] First use 40t electric arc furnace for smelting, then use 40t submerged arc heating ladle refining furnace to refine and vacuum degassed molten steel to pour ￠300mm consumable electrode, and use ￠300 consumable electrode to melt ￠300mm in electroslag remelting furnace 720 / ￠760mm, electroslag remelting steel ingot weighing about 5t.

[0082] (2) forging

[0083] Raise the electroslag remelted ingot to 650°C at a heating rate of 50°C / h for the first preheating, keep it for 2 hours, then raise it to 820°C at a heating rate of 80°C / h for the second preheating, and hold it for 2 hours , and then raised to 1200°C at a heating rate of 100°C / h, held for 15 hours for high-temperature diffusion, started forging at 1100°C, three upsetting and three pulling out, upsetting ratio = 2, total forgin...

Embodiment 3

[0092] Used steel ingot chemical composition (wt%) is as follows:

[0093] 0.394C; 1.077Si; 0.370Mn; 0.010P; 0.002S; 5.207Cr;

[0094] The process is as follows:

[0095] (1) Smelting

[0096] First use 40t electric arc furnace for smelting, then use 40t submerged arc heating ladle refining furnace to refine and vacuum degassed molten steel to pour ￠300mm consumable electrode, and use ￠300 consumable electrode to melt ￠300mm in electroslag remelting furnace 720 / ￠760mm, electroslag remelting steel ingot weighing about 5t.

[0097] (2) forging

[0098] Raise the electroslag remelted ingot to 650°C at a heating rate of 50°C / h for the first preheating, keep it for 2 hours, then raise it to 810°C at a heating rate of 80°C / h for the second preheating, and hold it for 2 hours , and then raised to 1200°C at a heating rate of 100°C / h, held for 15 hours for high-temperature diffusion, started forging at 1100°C, three upsetting and three pulling out, upsetting ratio = 2, total forgin...

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Abstract

The invention relates to a manufacturing technology of a hot work die steel forge piece. The manufacturing technology comprises the steps including forging, high-temperature normalization, high-temperature tempering, ultrafine solution treatment, spheroidizing and sampling inspection. Through the procedures and related heat treatment, chemical components in the hot work die steel forge piece tendto be consistent, the structure inheritance is effectively cut off, and accordingly the purposes of refining grains and homogenizing structures are achieved. After spheroidizing, a spherical pearlitewith fine-particle-shaped carbide evenly distributed on a ferrite base body is obtained. An excellent organization structure is provided for final heat treatment.

Description

technical field [0001] The invention relates to a manufacturing process of a steel forging, in particular to a manufacturing process of a hot die steel forging. Background technique [0002] The hot work die steel of the invention has good thermal strength, red hardness, high toughness, thermal fatigue resistance and thermal crack resistance, and is an air-cooled hardening hot work die steel with both strength and toughness. At present, this steel has become a kind of hot work die steel widely used in China and even in the world. Since the alloy element content in the hot work die steel of the present invention reaches about 8%, the eutectoid point is shifted to the left. Due to the serious segregation of carbon and alloy elements, unbalanced metastable massive eutectic carbides and secondary carbides distributed in chains along the grain boundaries appeared during the solidification process of the steel. At present, some hot work die steel forgings according to the presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C22C38/22C22C38/24C22C38/02C22C38/04B21J1/06B21J5/00
CPCB21J1/06B21J5/002C21D8/00C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 滕文青王志刚逯小强白富荣梁占斌
Owner 山西同航特钢有限公司
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