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Nickel-added high-polishing pre-hardened plastic mold steel plate and production method thereof

A technology of plastic mold and production method, applied in the field of plastic mold steel, can solve the problems of difficulty in meeting the hardness requirements of plastic mold steel, reduced polishing performance of mold steel, large difference in surface hardness, etc., and achieve excellent polishing performance of products and improve polishability. , the effect of hardness

Inactive Publication Date: 2019-03-15
TANGSHAN HEAVY PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the hardenability of plastic mold steel with low alloy composition such as 42CrMo is weaker than that of SM3Cr2Mo, there are quality problems such as low hardness in the core and large difference in hardness from the surface after quenching. It is difficult to meet the target that the hardness deviation of the entire steel plate does not exceed 3HRC. The greater the thickness, the more obvious the uneven hardness. When the thickness exceeds 50mm, the original 42CrMo composition is difficult to meet the hardness requirements for plastic mold steel.
In addition, after the alloy elements are reduced, the polishing performance of the mold steel is reduced, and it cannot meet the technical requirements of the polished mirror surface of plastic mold steel such as P20 (SM3Cr2Mo) reaching more than 2000 mesh.

Method used

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  • Nickel-added high-polishing pre-hardened plastic mold steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The thickness of the nickel-added high-polishing pre-hardened plastic mold steel plate in this embodiment is 80 mm, and its chemical composition and mass percentage are shown in Table 1.

[0020] The production method of nickel-added high-polish pre-hardened plastic mold steel plate in this embodiment includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and controlled cooling, and high-temperature tempering heat treatment processes. The specific process steps are as follows. Said:

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

[0022] (2) LF furnace refining and RH vacuum refining process: after LF furnace refining and RH vacuum refining, qualified molten steel is obtained, with Ni element content of 0.40% and H content of 1.2ppm;

[0023] (3) Continuous casting slab process: the thickness of the continuous casting slab is 220mm, and the specif...

Embodiment 2

[0028] The thickness of the nickel-added high-polishing pre-hardened plastic mold steel plate in this embodiment is 150mm, and its chemical composition and mass percentage are shown in Table 1.

[0029] The production method of nickel-added high-polish pre-hardened plastic mold steel plate in this embodiment includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and controlled cooling, and high-temperature tempering heat treatment processes. The specific process steps are as follows. Said:

[0030] (1) Converter smelting process: the molten iron entering the converter has a sulfur content of 0.042%;

[0031] (2) LF furnace refining and RH vacuum refining process: After LF furnace refining and RH vacuum refining, qualified molten steel is obtained, with Ni element content of 0.60% and H content of 1.5ppm;

[0032] (3) Continuous casting slab process: the thickness of the continuous casting slab is 400mm, and the specif...

Embodiment 3

[0037] In this embodiment, the nickel-added high-polish pre-hardened plastic mold steel plate has a thickness of 120mm, and its chemical composition and mass percentage are shown in Table 1.

[0038] The production method of nickel-added high-polish pre-hardened plastic mold steel plate in this embodiment includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and controlled cooling, and high-temperature tempering heat treatment processes. The specific process steps are as follows. Said:

[0039] (1) Converter smelting process: the molten iron entering the converter has a sulfur content of 0.046%;

[0040] (2) LF furnace refining and RH vacuum refining process: After LF furnace refining and RH vacuum refining, qualified molten steel is obtained, with Ni element content of 0.50% and H content of 1.0ppm;

[0041] (3) Continuous casting slab process: the thickness of the continuous casting slab is 280mm, and the specifica...

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Abstract

The invention discloses a nickel-added high-polishing pre-hardened plastic mold steel plate and a production method thereof. The steel plate is prepared from the chemical components of, by mass, 0.39-0.45% of C, 0.80-1.00% of Mn, 0.20-0.40% of Si, less than or equal to 0.015% of S, less than or equal to 0.020% of P, 0.90-1.10% of Cr, 0.15-0.25% of Mo, 0.40-0.60% of Ni, 0.005-0.030% of Al, and thebalance being iron and unavoidable impurities. The production method includes the processes of converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rollingand controlled cooling and high temperature tempering heat treatment. Through the component design of adding nickel and the processes of controlled rolling and controlled cooling and high temperaturetempering heat treatment, pre-hardened plastic mold steel is obtained, and the steel has the characteristics of excellent polishing performance and simple production processes.

Description

technical field [0001] The invention belongs to the technical field of plastic mold steel, and in particular relates to a nickel-added high-polishing pre-hardened plastic mold steel plate and a production method thereof. Background technique [0002] As an industrial raw material for the manufacture of plastic and rubber products, plastic mold steel is widely used in various industries such as household appliances, electronic communication equipment, living utensils, and vehicles. This type of die steel is generally delivered in a pre-hardened state, and the hardness is controlled between 28 and 36HRC. From the perspective of raw material cost, domestic 42CrMo, Japanese SCM440, American AISI 4140 and other brands are gradually introduced into the field of plastic mold steel due to their good economy. The mold steel plate standard YB / T 107 is low in SM3Cr2Mo, and its hardness is close to the use requirements of plastic mold steel. [0003] Since the hardenability of plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/06C22C38/04C22C38/02C22C33/04C21D1/18C21D8/02C21D6/00
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 任树洋秦坤李行刘志勇张阔斌尹绍江张锦兴侯蕾万焱
Owner TANGSHAN HEAVY PLATE CO LTD
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