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Continuous-casting production technology for low-compression-ratio high-flaw-detection-requirement SM4Gr2MnNi mould steel plate

A production process and scaling technology, which is applied in the field of die steel manufacturing, can solve the problems of large differences in the composition of the head and tail of the steel ingot, affecting the processing and use of users, and differences in the overall performance of the material, so as to improve the yield, shorten the production cycle, and reduce the production cost. Effect

Active Publication Date: 2019-01-18
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This material is generally used to make mold cores, so it has high requirements on the density of the material. In the domestic market, the thickness of continuous casting slabs is generally ≤100mm. For materials with a thickness greater than 100mm, steel ingots are usually used, which leads to a significant increase in cost. , and due to the large difference in the composition of the head and tail of the steel ingot, there is a significant difference in the overall performance of the material, which affects the processing and use of the user

Method used

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  • Continuous-casting production technology for low-compression-ratio high-flaw-detection-requirement SM4Gr2MnNi mould steel plate
  • Continuous-casting production technology for low-compression-ratio high-flaw-detection-requirement SM4Gr2MnNi mould steel plate
  • Continuous-casting production technology for low-compression-ratio high-flaw-detection-requirement SM4Gr2MnNi mould steel plate

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Experimental program
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Effect test

Embodiment 1

[0029] The thickness of the SM4Cr2MnNi plastic mold steel plate suitable for low compression ratio and high flaw detection requirements involved in this embodiment is 250 mm, the compression ratio is 1.8, and its chemical composition is calculated by mass percentage: C: 0.43%, Si: 0.25%, Mn: 1.55% , P: 0.013%, S: 0.005%, Cr: 2.00%, Mo: 0.20%, Ni: 1.15%, and the balance is Fe and unavoidable impurity elements.

[0030] The manufacturing process of the steel plate is as follows:

[0031] Production process: converter steelmaking→refining→vacuum degassing→450mm continuous casting slab→hot delivery→heating→slab rolling→heating→secondary rolling→heat treatment→flaw detection→finishing→inspection→warehousing.

[0032] The specific operation of the main process is as follows:

[0033] Refining and vacuum degassing treatment reduce the five harmful elements in steel, and adopt light reduction technology to ensure the internal quality of 450mm continuous casting slab. On the basis of ...

Embodiment 2

[0041] The thickness of the SM4Cr2MnNi plastic mold steel plate suitable for low compression ratio and high flaw detection requirements involved in this embodiment is 200mm, the compression ratio is 2.25, and its chemical composition is calculated by mass percentage: C: 0.43%, Si: 0.25%, Mn: 1.50% , P: 0.012%, S: 0.005%, Cr: 1.95%, Mo: 0.20%, Ni: 1.10%, and the balance is Fe and unavoidable impurity elements.

[0042]The manufacturing process of the steel plate is as follows:

[0043] Production process: converter steelmaking→refining→vacuum degassing→450mm continuous casting slab→hot delivery→heating→slab rolling→heating→secondary rolling→heat treatment→flaw detection→finishing→inspection→warehousing.

[0044] The specific operation of the main process is as follows:

[0045] Refining and vacuum degassing treatment reduce the five harmful elements in steel, and adopt light reduction technology to ensure the internal quality of 450mm continuous casting slab.

[0046] The bil...

Embodiment 3

[0053] The thickness of the SM4Cr2MnNi plastic mold steel plate suitable for low compression ratio and high flaw detection requirements related to this embodiment is 180mm, the compression ratio is 2.5, and its chemical composition is calculated by mass percentage: C: 0.42%, Si: 0.25%, Mn: 1.50% , P: 0.013%, S: 0.004%, Cr: 1.90%, Mo: 0.20%, Ni: 1.10%, and the balance is Fe and unavoidable impurity elements.

[0054] The manufacturing process of the steel plate is as follows:

[0055] Production process: converter steelmaking→refining→vacuum degassing→450mm continuous casting slab→hot delivery→heating→slab rolling→heating→secondary rolling→heat treatment→flaw detection→finishing→inspection→warehousing.

[0056] The specific operation of the main process is as follows:

[0057] Refining and vacuum degassing treatment to reduce the five harmful elements in the steel, and the use of light reduction technology to ensure the internal quality of 450mm continuous casting slab, see th...

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Abstract

The invention relates to a continuous-casting production technology for a low-compression-ratio high-flaw-detection-requirement SM4Gr2MnNi mould steel plate. The technology comprises the following processes: converter steelmaking, refining, vacuum degassing, 450 mm of a continuous casting blank, hot-sending, heating, blooming and rolling, heating, secondary rolling, heat-treatment, flaw detection,finishing, checking and storing. In the blooming and rolling process, through rapidly cooling the surface, strength of the surface is improved, and the situation that a core temperature of a blank material is higher than that of the surface is guaranteed, and deformation rate of a core is improved. A roughing mill single-machine-frame low-velocity high-reduction technology is used. In the blooming and rolling process, low-velocity high-reduction rolling is performed for 4-6 strokes, a single-stroke reduction amount is 30-60 mm, and a total reduction rate reaches 30% or more, and a blooming material is formed. Through a secondary rolling technology, internal quality of the steel plate is effectively improved, and a density of a material is improved. A maximum thickness of the produced SM4Gr2MnNi steel plate reaches 250 mm, a minimum compression ratio is 1.8, and the flow detection meets a NB / T 47013.3 I-level requirement.

Description

technical field [0001] The invention relates to a manufacturing method of die steel, in particular to a production process of SM4Cr2MnNi die steel plate with low compression ratio and high flaw detection requirements. Background technique [0002] SM4Cr2MnNi is a high-mirror pre-hardened plastic mold steel with a large demand in the domestic market. This steel has strong hardenability, and the material has good polishing performance and photoetching. This material is generally used to make mold cores, so it has high requirements on the density of the material. In the domestic market, the thickness of continuous casting slabs is generally ≤100mm. For materials with a thickness greater than 100mm, steel ingots are usually used, which leads to a significant increase in cost. , and due to the large difference in the composition of the head and tail of the steel ingot, there is a significant difference in the overall performance of the material, which affects the processing and u...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21D1/18C21D1/28C21D1/84C21D6/00C21D8/02C21D9/00C22C33/04C22C38/02C22C38/04C22C38/44C22C38/58B21B1/46B21B37/58B21B45/02
CPCB21B1/463B21B37/58B21B45/0203C21C7/10C21D1/18C21D1/28C21D1/84C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/04C22C38/002C22C38/02C22C38/04C22C38/44C22C38/58
Inventor 何广霞黄军苗丕峰吴小林吴扬葛恒贵
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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