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 relative

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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Example Embodiment

[0036] Example 1:

[0037] The design components of the full bainitic structure plastic mold steel in this embodiment are: 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 inevitable impurities.

[0038] Using converter smelting according to the above components, continuous casting into 220*1600mm billets, and heating in a heating furnace at a heating temperature of 1220°C; rolling by a hot rolling process with an opening 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; after the hot-rolled steel plate is air-cooled to the surface 350°C, the stacking is slowly cooled for more than 48 hours. The final hardness range of the steel plate is 32-34HRC, and the microstructure is full bainite. organization, see figure 1 and figure 2 shown.

Example Embodiment

[0039] Embodiment 2:

[0040] The design components of the full bainite structure plastic mold steel in this embodiment are: 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 inevitable impurities.

[0041]Using converter smelting according to the above components, continuous casting into 220*1600mm billets, and heating in a heating furnace at a heating temperature of 1240°C; rolling by a hot rolling process with an opening 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, the stacking is slowly cooled for more than 48 hours. The final hardness range of the steel plate is 30-32HRC, and the microstructure is full shell. Steretic structure, see details 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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