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Self-tempering full-bainite structure plastic die steel and preparation method thereof

A technology of plastic mold steel and bainite, applied in the field of iron and steel, can solve the problems of low production efficiency, high manufacturing cost of plastic mold steel, inapplicability, etc., and achieve the effects of low cost, reduced process and good economy.

Pending Publication Date: 2019-12-03
福建三钢闽光股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this solution has the following disadvantages: First, although this solution does not require high-temperature tempering, it adds precious alloying elements such as Ni and Zr, and adopts a low-C composition design, so the manufacturing cost of plastic mold steel is still relatively high; Second, this solution is only suitable for single blank die casting to produce steel plates with a thickness specification of 500mm-800mm, and the production efficiency is low, and it is not suitable for large-scale industrial continuous casting production, which has certain limitations

Method used

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  • Self-tempering full-bainite structure plastic die steel and preparation method thereof
  • Self-tempering full-bainite structure plastic die steel and preparation method thereof
  • Self-tempering full-bainite structure plastic die steel and preparation method thereof

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Embodiment 1

[0037] The design composition of the plastic mold steel with full bainitic structure in this embodiment is: C: 0.27%, Si: 0.43%, Mn: 0.79%, Cr: 1.62%, Mo: 0.19%, Ti: 0.025%. , B: 0.0017%, Alt: 0.032%, S: 0.0017%, P: 0.0013%, H: 0.00024%, N: 0.004%, and the rest are Fe and unavoidable impurities.

[0038] According to the above ingredients, it is smelted in a converter, continuously cast into a billet of 220*1600mm, and heated in a heating furnace at a heating temperature of 1220°C; it is rolled by a hot rolling process with a starting temperature of 1120°C and a single-pass reduction of 12%. The thickness of the steel plate is 31mm, and the final rolling temperature is 880°C; the hot-rolled steel plate is air-cooled to 350°C on the surface, and then stacked and slowly cooled for more than 48 hours. The steel plate with a final hardness range of 32-34HRC has a microstructure of full bainite organization, see figure 1 and figure 2 shown.

Embodiment 2

[0040] The design composition of the plastic mold steel with full bainitic structure in this embodiment is: C: 0.29%, Si: 0.44%, Mn: 0.79%, Cr: 1.64%, Mo: 0.20%, Ti: 0.020% , B: 0.0017%, Alt: 0.035%, S: 0.001%, P: 0.0015%, H: 0.00021%, N: 0.0032%, and the rest are Fe and unavoidable impurities.

[0041]According to the above composition, it is smelted in a converter, cast continuously into a billet of 220*1600mm, and heated in a heating furnace at a heating temperature of 1240°C; it is rolled by a hot rolling process, with a starting temperature of 1180°C and a single-pass reduction of 11%. The thickness of the steel plate is 46mm, and the final rolling temperature is 860°C; after the hot-rolled steel plate is air-cooled to a surface temperature of 450°C, and then stacked and slowly cooled for more than 48 hours, the steel plate with a final hardness range of 30-32HRC has a microstructure of full shell body structure, see image 3 and Figure 4 shown.

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Abstract

The invention discloses self-tempering full bainite structure plastic die steel and a preparation method thereof, relating to the technical field of steel, the steel comprises the following componentsin percentage by mass: C:0.20-0.35%, Si:0.25-0.45%, Mn:0.50-0.8%, Cr:1.4-2.0%, 0.15%-0.25% of Mo, 0.020%-0.035% of Ti, 0.0015%-0.0030% of B, 0.02%-0.04% of Alt, S<=0.003%, P<=0.015%, H <= 0.0003%, N<= 0.005% and the balance Fe and inevitable impurities. According to the invention, precious alloy elements such as Ni and Zr are not added; by optimizing the component design and reasonably controlling the adding amount of alloy elements such as Si, Mn, Cr and Alt, all the elements cooperate with one another to achieve a synergistic effect, finally, the plastic die steel with excellent mechanical properties such as strength and toughness is obtained, the production cost is effectively reduced, and good economical efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a self-tempered full bainite plastic mold steel and a preparation method thereof. Background technique [0002] With the promotion and application of plastic products in industry and daily life, the demand for mold steel in the plastic mold industry is also increasing. In plastic molding processing, the quality of the mold is self-evident for the guarantee of product quality. Plastic molds have been developing in the direction of precision, large-scale and multi-cavity, and the requirements for the performance of plastic mold steel are getting higher and higher. Due to the quenching and tempering treatment of traditional quenched and tempered plastic mold steel, there will be a lot of internal stress inside, and for plastic mold steel with large cross-section, the influence of this internal stress is quite huge, rather than Quenched and tempered plastic mold steel has re...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/28C22C38/32C22C38/06C21D7/13
CPCC21D7/13C21D2211/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/28C22C38/32
Inventor 黄标彩陈玉叶武会宾魏勇詹光曹王明娣严晓敏张鹏程
Owner 福建三钢闽光股份有限公司
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