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A kind of easy welding pre-hardened plastic mold steel plate and production method thereof

A technology of a plastic mold and a production method, applied in the field of steel production, can solve problems such as poor weldability and difficult repair, and achieve the effects of reducing production costs, facilitating welding, and ensuring welding performance.

Active Publication Date: 2019-10-25
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the plastic mold is used, it is inevitable that the mold will be partially damaged and needs to be repaired. However, the carbon content of the existing plastic mold steel is generally between 0.35 and 0.45%. The weldability is poor and it is not easy to repair.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The thickness specification of the easy-to-weld pre-hardened plastic mold steel plate in this embodiment is 15mm, and its chemical composition and mass percentage are: C: 0.20%, Mn: 0.20%, Si: 0.27%, S: 0.015%, P: 0.020% , Cr: 1.00%, Mo: 0.15%, Ni: 0.80%, Al: 0.005%, and the rest are iron and unavoidable impurities.

[0020] Its production process includes converter smelting, LF furnace refining, RH furnace vacuum refining, continuous casting, heating, controlled rolling and controlled cold rolling and high temperature tempering heat treatment process. The specific steps of each process are as follows:

[0021] (1) Converter smelting process: the molten iron entering the converter has an S content of 0.050%;

[0022] (2) Refining in LF furnace and vacuum refining in RH furnace: After refining in LF furnace and refining in RH vacuum furnace, qualified molten steel is obtained, and the C element content is 0.20%;

[0023] (3) Continuous casting process: the thickness of...

Embodiment 2

[0029] The thickness specification of the easy-to-weld pre-hardened plastic mold steel plate in this embodiment is 200mm, and its chemical composition and mass percentage are: C: 0.24%, Mn: 0.25%, Si: 0.40%, S: 0.005%, P: 0.015% , Cr: 1.60%, Mo: 0.23%, Ni: 1.05%, Al: 0.030%, and the rest are iron and unavoidable impurities.

[0030] Its production process includes converter smelting, LF furnace refining, RH furnace vacuum refining, continuous casting, heating, controlled rolling and controlled cold rolling and high temperature tempering heat treatment process. The specific steps of each process are as follows:

[0031] (1) Converter smelting process: the molten iron entering the converter has an S content of 0.050%;

[0032] (2) Refining in LF furnace and vacuum refining in RH furnace: After refining in LF furnace and refining in RH vacuum furnace, qualified molten steel is obtained, and the C element content is 0.30%;

[0033] (3) Continuous casting process: the thickness o...

Embodiment 3

[0039] The thickness specification of the easy-to-weld pre-hardened plastic mold steel plate in this embodiment is 100mm, and its chemical composition and mass percentage are: C: 0.25%, Mn: 0.30%, Si: 0.30%, S: 0.005%, P: 0.015% , Cr: 1.30%, Mo: 0.22%, Ni: 1.00%, Al: 0.020%, and the rest are iron and unavoidable impurities.

[0040] Its production process includes converter smelting, LF furnace refining, RH furnace vacuum refining, continuous casting, heating, controlled rolling and controlled cold rolling and high temperature tempering heat treatment process. The specific steps of each process are as follows:

[0041] (1) Converter smelting process: the molten iron entering the converter has an S content of 0.050%;

[0042] (2) Refining in LF furnace and vacuum refining in RH furnace: After refining in LF furnace and refining in RH vacuum furnace, qualified molten steel is obtained, and the C element content is 0.25%;

[0043] (3) Continuous casting process: the thickness o...

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Abstract

The invention discloses an easy-welded pre-hardened plastic die steel plate and a production method thereof, and belongs to the technical field of steel production. The steel plate is prepared from, by weight, 0.20-0.30% of carbon, 0.20-0.40% of manganese, 0.20-0.40% of silicon, less than or equal to 0.015% of sulfur, less than or equal to 0.020% of phosphorus, 1.00-1.60% of chromium, 0.15-0.25% of molybdenum, 0.80-1.10% of nickel, 0.005-0.030% of aluminum, balance ferrum and inevitable impurities. The production method comprises the treatment processes of bessemerizing, LF furnace refining, RH furnace vacuum refining, continuous casting, heating, controlled-rolling and controlled-cooling rolling and high temperature tempering thermal treatment. The easy-welded pre-hardened plastic die steel plate and the production method thereof have the advantages that the hardness of the obtained steel plate is 28-36 HRC, the hardness deviation of a same steel plate is less than or equal to 3 HRC,the welding sensibility index Pcm is less than or equal to 0.40, and the welding is easy.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to an easy-to-weld pre-hardened plastic mold steel plate and a production method thereof. Background technique [0002] As a raw material for the manufacture of plastic and rubber products, plastic mold steel is used in various industries such as vehicles, electronic communication equipment, and household appliances. After the plastic mold is used, it is inevitable that the mold will be partially damaged and needs to be repaired. However, the carbon content of the existing plastic mold steel is generally between 0.35% and 0.45%. The weldability is poor and it is not easy to repair. For example, the plastic mold steel plate standard YB / T 107 of the Ministry of Metallurgy generally adopts high C, Cr, and Mo components, such as SM3Cr2Mo, SM3Cr2Ni1Mo steel plates, etc., and the welding crack sensitivity index Pcm of this type of mold steel (calculation form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C21D8/02C22C33/04
CPCC21D8/0221C21D8/0247C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 任树洋秦坤李行尹绍江王云阁石晓伟刘志勇张锦兴侯蕾
Owner TANGSHAN IRON & STEEL GROUP
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