Prehardening plastic die steel plate and manufacture method thereof

A technology of plastic mold steel and steel plate, which is applied in the field of pre-hardened plastic mold steel and steel plate and its manufacture, and can solve the problems affecting the quality of polishing and uneven surface hardness of steel plate

Active Publication Date: 2012-01-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the pre-hardening treatment of the existing pre-hardened plastic mold steel plates, the surface hardness of the steel plates often appears uneven, and the hardness difference between the same plates even exceeds 30

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The percentage by weight of the composition of this pre-hardened plastic mold steel steel plate embodiment is:

[0023] C 0.35%; Si 0.52; Mn 0.92; Cr 1.45; Mo 0.33;

[0024] P 0.012; S 0.003; Al 0.030; Ti 0.02; B 0.0025.

[0025] The rest is Fe and unavoidable impurities. The specification of the steel plate is 200×1000×4300mm, and the maximum hardness value minus the minimum hardness value on the surface of the steel plate is 20HB.

Embodiment 2

[0027] The percentage by weight of the composition of this pre-hardened plastic mold steel steel plate embodiment is:

[0028] C 0.32%; Si 0.30; Mn 0.65; Cr 1.74; Mo 0.37;

[0029] P 0.009; S 0.001; Al 0.040; Ti 0.015; B 0.0015.

[0030] The rest is Fe and unavoidable impurities. The specification of the steel plate is 200×1000×4300mm, and the maximum hardness value minus the minimum hardness value of the steel plate surface is 18HB.

Embodiment 3

[0032] The percentage by weight of the composition of this pre-hardened plastic mold steel steel plate embodiment is:

[0033] C 0.38%; Si 0.68; Mn 0.83; Cr 2.0; Mo 0.45;

[0034] P 0.015; S 0.001; Al 0.020; Ti 0.04; B 0.0038.

[0035] The rest is Fe and unavoidable impurities. The specification of the steel plate is 200×1000×4300mm, and the maximum hardness value minus the minimum hardness value of the steel plate surface is 15HB.

[0036] Steel plate manufacturing method embodiment one

[0037] What this embodiment made was the pre-hardened plastic mold steel steel plate of the above-mentioned embodiment, and the steps of this embodiment are as follows:

[0038] The first step of smelting

[0039] 60 tons of molten steel smelted by 50 tons of EBT (electric furnace) are sequentially smelted by 60 tons of LF (ladle refining) and 60 tons of VD (vacuum degassing).

[0040] C 0.35%; Si 0.52; Mn 0.92; Cr 1.74; Mo 0.37;

[0041] P 0.012; S 0.003; Al 0.036; Ti 0.02; B 0.0025. ...

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PUM

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Abstract

The invention relates to a prehardening plastic die steel plate and a manufacture method thereof. The steel plate comprises, by weight, C 0.28 to 0.40, Si 0.20 to 0.80, Mn 0.60 to 1.0, Cr 1.40 to 2.2, Mo 0.30 to 0.50, P no more than 0.030, S no more than 0.030, Al 0.01 to 0.08, Ti 0.01 to 0.05 and B 0.0010 to 0.0050, with the balance being Fe and unavoidable impurities. The manufacture method comprises a first step of smelting, that is, carrying out tapping and casting when components in liquid steel meet requirements so as to obtain steel ingots, a second step of hot rolling, that is, rolling the steel ingots into steel plates with a thickness of 60 to 200 mm, a width of 300 to 1500 and a length of 2000 to 8000 mm, a third step of cooling, that is, cooling the steel plates to a temperature below 550 DEG C, wherein, slow cooling time is no less than 24 hours, and a fourth step of tempering, that is, arranging the steel plates in a tempering furnace for tempering at a temperature of 400 to 600 DEG C, carrying out insulation for 4 to 12 hours, taking the steel plates out of the tempering furnace and cooling the steel plates to room temperature in the air. The difference of surface hardness of prehardening plastic die steel plates manufactured in the invention is within 20 HB.

Description

technical field [0001] The invention relates to a pre-hardened plastic mold steel plate and a manufacturing method thereof. Background technique [0002] The existing pre-hardened plastic mold steel plates often have uneven surface hardness after pre-hardening treatment, and the hardness difference between the same plates even exceeds 30HB, which has a certain impact on the quality stability of the product and the use of end users, especially It has a great influence on the stability of the polishing performance of the mold and affects the quality of polishing. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing pre-hardened plastic mold steel plate, the present invention provides a pre-hardened plastic mold steel plate with a surface hardness difference within 20HB, and also provides a manufacturing method of the steel plate. [0004] The technical idea of ​​the present invention is that in the process of producing pre...

Claims

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Application Information

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IPC IPC(8): C22C38/32C21D8/02C21D1/18
Inventor 陈建礼张晓琨田培凤王之香
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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