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

A technology of a plastic mold and a production method, applied in the field of metallurgy, can solve the problems of high production cost, complex process, complicated process, etc., and achieve the effects of excellent product performance, simple production process, and reduced production cost.

Active Publication Date: 2018-12-18
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quenching and tempering process first quenches, and then high-temperature tempering is the most complicated process; compared with the quenching and tempering heat treatment, TMCP+ tempering heat treatment omits the quenching process, and the process is relatively simple, but there are still problems of high production cost, complicated process, and long time. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical composition and mass percentage of the pre-hardened plastic mold steel plate with a thickness specification of 15mm in this embodiment are: C: 0.40%, Mn: 0.80%, S: 0.015%, P: 0.010%, Si: 0.80%, Al : 0.015%, Cr: 0.80%, Mo: 0.10%, the rest is iron and unavoidable impurities; the ratio of Mn / Cr and Si / Cr is 1.

[0022] The production method includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting, rolling and cooling processes, and the specific process steps are as follows:

[0023] (1) Rolling process: The continuous casting slab obtained through converter smelting, LF furnace refining, RH vacuum refining, and continuous casting process is rolled by TMCP. The heating temperature before rolling is 1260°C, descaled by high-pressure water, and rolled to a thickness of 15mm. The final rolling temperature is 850°C;

[0024] (2) Cooling process: adopt air cooling.

[0025] After cooling to room temperature, tempering heat treatment...

Embodiment 2

[0027] The chemical composition and mass percentage of the pre-hardened plastic mold steel plate with a thickness specification of 30 mm in this embodiment are: C: 0.42%, Mn: 0.80%, S: 0.010%, P: 0.020%, Si: 1.10%, Al : 0.015%, Cr: 0.80%, Mo: 0.20%, and the rest are iron and unavoidable impurities; the ratios of Mn / Cr and Si / Cr are 1 and 1.38, respectively.

[0028] The production method includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting, rolling and cooling processes, and the specific process steps are as follows:

[0029] (1) Rolling process: The continuous casting slab obtained through converter smelting, LF furnace refining, RH vacuum refining, and continuous casting process is rolled by TMCP. The heating temperature before rolling is 1240°C, descaled by high-pressure water, and rolled to a thickness of 30mm. The final rolling temperature is 820°C;

[0030] (2) Cooling process: Water cooling is adopted, and the redness temperature aft...

Embodiment 3

[0033] The chemical composition and mass percentage of the pre-hardened plastic mold steel plate with a thickness specification of 50 mm in this embodiment are: C: 0.42%, Mn: 0.90%, S: 0.009%, P: 0.018%, Si: 1.00%, Al : 0.015%, Cr: 0.95%, Mo: 0.20%, the rest is iron and unavoidable impurities; Mn / Cr and Si / Cr ratios are 0.95 and 1.05, respectively.

[0034] The production method includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting, rolling and cooling processes, and the specific process steps are as follows:

[0035] (1) Rolling process: The continuous casting slab obtained through converter smelting, LF furnace refining, RH vacuum refining, and continuous casting process is rolled by TMCP. The heating temperature before rolling is 1220°C, descaled by high-pressure water, and rolled to a thickness of 50mm. The final rolling temperature is 840°C;

[0036] (2) Cooling process: Water cooling is adopted, and the redness temperature after water ...

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Abstract

The invention discloses a precuring plastic mold steel plate and a TMCP production method thereof. The steel plate comprises the chemical components of, by mass, 0.40-0.46% of C, 0.80-1.10% of Mn, 0.80-1.10% of Si, less than or equal to 0.015% of S, less than or equal to 0.020% of P, 0.80-1.10% of Cr, less than or equal to 0.25% of Mo, 0.015-0.040% of Al, and the balance iron and unavoidable impurities. The production method comprises a rolling procedure and a cooling procedure. The Mo content is lower than 0.25%, valuable alloy elements such as Ni, Nb, Ti and V are not added, so that the production cost is effectively lowered. The even hardness between 28-34 HRC can be obtained by controlling the cooling and re-reddening temperature after rolling and no tempering heat treatment is conducted, and the precuring plastic mold steel plate and the TMCP production method thereof have the characteristics of being simple in production technology, reasonable in chemical component design, and good in product property.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a pre-hardened plastic mold steel plate and a TMCP production method thereof. Background technique [0002] As a mold material for the manufacture of plastic and rubber products, plastic mold steel is widely used in various industries such as electronic communication equipment, household appliances, living appliances, automobiles and motorcycles. The chemical composition of SM3Cr2Mo and SM3Cr2Ni1Mo are given in the YB / T 107 Ministry of Metallurgical Plastic Die Steel Standard, which correspond to American ASTM P20 and Swedish 718 plastic mold steel respectively. Generally, they are delivered in a pre-hardened state, and the hardness is controlled between 28-38HRC. [0003] Generally speaking, pre-hardened plastic mold steel is produced by quenching and tempering or TMCP (thermomechanical rolling) rolling and tempering heat treatment. The quenching and tempering p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/02C22C38/04C22C38/06C22C33/04C21D8/02B21C37/02
Inventor 任树洋秦坤尹绍江王云阁李行孟庆勇郑文超王重君侯蕾
Owner TANGSHAN IRON & STEEL GROUP
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