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Manufacturing method for large section forgings of high-speed tool steel

A high-speed tool steel and a manufacturing method technology, applied in the field of steel forging, can solve the problems of deterioration of carbide segregation, serious inhomogeneity of eutectic carbides in large-section forging materials, increase of internal cracks and surface cracking defects, etc., so as to reduce the structure The effect of segregation

Inactive Publication Date: 2016-04-27
FUSHUN SPECIAL STEEL SHARES
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention discloses a method for manufacturing high-speed tool steel large-section forgings, aiming at solving the deterioration of carbide segregation in the as-cast structure of large steel ingots, causing serious unevenness of eutectic carbides in large-section forgings and internal cracks in the forging process and the problem of increased surface crack defects

Method used

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  • Manufacturing method for large section forgings of high-speed tool steel
  • Manufacturing method for large section forgings of high-speed tool steel
  • Manufacturing method for large section forgings of high-speed tool steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Production of M2 round steel with a size of Φ179mm;

[0058] 1. The smelting branch produces M 2 Steel type, finished product specification Φ179mm (dimension tolerance -0mm, +2mm), chemical composition of electroslag ingot is shown in Table 1;

[0059] Table 1 Chemical composition of electroslag ingot

[0060]

[0061] 2. EAF+LF+VD+ESR method is used for smelting, VD tapping temperature is 1510℃, pouring Φ250mm

[0062] Electrode, casting electrode carbon saturation Ac=0.79, electroslag remelting casting Φ480mm electroslag ingot;

[0063] 3. Heat the steel ingot to 800°C for 3 hours, then raise the temperature to 1180°C for 5 hours, and then take it out of the furnace for forging;

[0064] 4. The 1st and 2nd fires of forging adopt symmetrical forging, the reduction amount of each pass is not more than 20mm, the deformation amount of this process is 4%, and the final forging temperature is 960°C; the 3rd to 8th fires adopt asymmetric forging, and the forging Flip 18...

Embodiment 2

[0066] Production of 1.3343 round steel with a size of Φ202mm;

[0067] 1. The smelting branch produces 1.3343 steel grades, the finished product specification is Φ202mm (dimensional tolerance -0mm, +3mm), and the chemical composition of the electroslag ingot is shown in Table 2;

[0068] Table 2 Chemical composition of electroslag ingot

[0069]

[0070] 2. EAF+LF+VD+ESR method is used for smelting, VD tapping temperature is 1515℃, pouring Φ250mm

[0071] Electrode, casting electrode carbon saturation Ac=0.78, electroslag remelting casting Φ480mm electroslag ingot;

[0072] 3. Heat the steel ingot to 800°C for 3 hours, then raise the temperature to 1180°C for 5 hours, and then take it out of the furnace for forging;

[0073] 4. The 1st and 2nd fires of forging adopt symmetrical forging, the reduction amount of each pass is not more than 20mm, the deformation amount of this process is 3%, and the final forging temperature is 990°C; the 3rd to 8th fires adopt asymmetric fo...

Embodiment 3

[0075] Production of 1.3343ESR round steel with a size of Φ303mm;

[0076] 1. The smelting branch produces 1.3343ESR steel grade, the finished product specification is Φ303mm (dimensional tolerance -0mm, +3mm), and the chemical composition of the electroslag ingot is shown in Table 3;

[0077] Table 3 Chemical composition of electroslag ingot

[0078]

[0079] 2. EAF+LF+VD+ESR method is used for smelting, VD tapping temperature is 1510℃, pouring Φ250mm

[0080] Electrode, casting electrode carbon saturation Ac=0.76, electroslag remelting casting Φ610mm electroslag ingot;

[0081] 3. Heat the steel ingot to 800°C for 3 hours, then raise the temperature to 1180°C for 6 hours, and then take it out of the furnace for forging;

[0082] 4. The 1st and 2nd fires of forging adopt symmetrical forging, the reduction amount of each pass does not exceed 20mm, the deformation amount of this process is 5%, and the final forging temperature is 970°C; the 3rd to 8th fires adopt asymmetri...

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Abstract

The invention discloses a manufacturing method for large section forgings of high-speed tool steel, and aims to solve the problem that internal cracks and surface cracks in the forgings are increased. According to the technical scheme adopted by the invention, the cleanliness of the molten steel is improved by steel-making processes such as LF refining, VD degassing, aluminum wire feeding and the like, and eutectic carbide segregation and steel hot-working plasticity are improved by controlling electroslag remelting output power and carrying out homogenization treatment before forging; large-particle carbides are crushed and unevenness of the eutectic carbides is improved by controlling forging times and different deformation amount of steel ingots of large high-speed tool steel; according to ASTMA388 standards, the ultrasonic flaw detection does not reach the level of a flat-bottom hole not greater than phi 3. The manufacturing method has the following advantages: carbon saturation is reasonably controlled, cleanliness of molten steel is controlled, segregation of components and carbides is reduced, the inner part of steel is sufficiently deformed, and the carbides of the steel internal structure are guaranteed to be crushed.

Description

technical field [0001] The invention belongs to a steel material forging method, in particular to a method for manufacturing a high-speed steel large-section forging material, which is the smelting and forging of a Φ160mm-Φ350mm forging material. Background technique [0002] High-speed tool steel, referred to as high-speed steel, is a special steel that can obtain extremely high hardness (HRC) 63-70 through special heat treatment, and can still maintain high hardness (HRC) above 60 and high wear resistance at 550 ° C ~ 600 ° C. Heat-resistant and wear-resistant steels are mainly used to manufacture cutting tools for various machine tools, and are also partially used in high-load molds, aviation high-temperature bearings and special heat-resistant and wear-resistant parts. [0003] High-speed steel belongs to high-carbon and high-alloy ledeburite steel. One of the main structural characteristics is that it contains a large number of carbides, which include a large number of ...

Claims

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Application Information

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IPC IPC(8): B21J5/00C21C7/10C21C7/076C21C7/072C22B9/18
CPCB21J5/00C21C7/072C21C7/076C21C7/10C22B9/18Y02P10/20
Inventor 杨天亮王琳刘振天刘玉芬谷强于宗洋巴俊波刘宝石马野刘明刘晓牟风于海鹏孙国元
Owner FUSHUN SPECIAL STEEL SHARES
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