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Production process of large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plates

A technology for plastic molds and production processes, applied in metal rolling and other directions, can solve the problems of poor quality stability, limited billet thickness, low efficiency, etc., to achieve uniform performance, reduce the hardness difference of the whole plate, and reduce production costs.

Inactive Publication Date: 2019-03-08
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the manufacture of extra-thick slabs, the efficiency is low, the cost is high, and the quality stability is poor by using traditional steel ingots; the slabs made by continuous casting are limited by the thickness of the billet

Method used

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  • Production process of large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plates
  • Production process of large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plates
  • Production process of large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The thickness of the large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plate that this embodiment relates to is 300mm, and its chemical composition is calculated by mass percentage: C: 0.43%, Si: 0.28%, Mn: 1.55%, P: 0.005% , S: 0.002%, Cr: 1.95%, Mo: 0.23%, and the balance is Fe and unavoidable impurity elements.

[0035] The manufacturing process of the steel plate is as follows:

[0036] Production process: converter steelmaking→refining→vacuum degassing→continuous casting of φ900*1450mm ellipse billet→hot delivery→heating in soaking furnace→rolling→heat treatment→flaw detection→finishing→inspection→warehousing.

[0037] The specific operation of the main process is as follows:

[0038] Refining and vacuum degassing treatment reduce five harmful elements in steel; continuous casting with low superheat and constant drawing speed, and adopt electromagnetic stirring and light reduction technology to ensure the internal quality of φ900*1450mm ova...

Embodiment 2

[0044]The thickness of the large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel sheet that this embodiment relates to is 260mm, and its chemical composition is calculated by mass percentage: C: 0.41%, Si: 0.28%, Mn: 1.50%, P: 0.006% , S: 0.002%, Cr: 1.95%, Mo: 0.20%, and the balance is Fe and unavoidable impurity elements.

[0045] The manufacturing process of the steel plate is as follows:

[0046] Production process: converter steelmaking→refining→vacuum degassing→continuous casting of φ900*1450mm ellipse billet→hot delivery→heating in soaking furnace→rolling→heat treatment→flaw detection→finishing→inspection→warehousing.

[0047] The specific operation of the main process is as follows:

[0048] Refining and vacuum degassing treatment reduce five harmful elements in steel; continuous casting with low superheat and constant drawing speed, and adopt electromagnetic stirring and light reduction technology to ensure the internal quality of φ900*1450mm oval...

Embodiment 3

[0054] The thickness of the large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plate that this embodiment relates to is 200mm, and its chemical composition is calculated by mass percentage: C: 0.40%, Si: 0.28%, Mn: 1.50%, P: 0.006% , S: 0.003%, Cr: 1.93%, Mo: 0.21%, and the balance is Fe and unavoidable impurity elements.

[0055] The manufacturing process of the steel plate is as follows:

[0056] Production process: converter steelmaking→refining→vacuum degassing→continuous casting of φ900*1450mm ellipse billet→hot delivery→heating in soaking furnace→rolling→heat treatment→flaw detection→finishing→inspection→warehousing.

[0057] The specific operation of the main process is as follows:

[0058] Refining and vacuum degassing treatment reduce five harmful elements in steel; continuous casting with low superheat and constant drawing speed, and adopt electromagnetic stirring and light reduction technology to ensure the internal quality of φ900*1450mm ova...

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Abstract

The invention relates to a production process of large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plates. The production process comprises the technological steps of continuous casting, hot feeding, soaking pit furnace heating, rolling, heat treatment, flaw detection, finishing, check and warehousing of elliptical billets with the diameter of 900*1450 mm. The temperature rising rate of a soaking pit furnace is set according to characteristics of the steel type during rolling and heating and includes the low-temperature section, the medium-temperature section and the high-temperature section. The heating rate is set in a sectioned mode. Thermal stress formed by the internal and external temperature difference to the elliptical billets can be effectively retarded. The full-longitudinal low-speed high-reduction rolling process is adopted during rolling, and the widths of the steel plates are invariant finally. Scale removing is conducted through high-pressure water for 1-3 times in the rolling process, the quality of the steel plates is ensured, vertical roll rolling is conducted after completion of the high-reduction pass, the edges of the steel plates are protected against bulges, and the yield is increased. The offline quenching and tempering heat treatment process is adopted during heat treatment. The stability of the core performance of this types ofsteel plates can be substantially improved, the hardness difference of the whole plates can be reduced, and the comprehensive performance of the steel plates can be improved.

Description

technical field [0001] The invention relates to a production process of a large-thickness high-performance pre-hardened SM4Cr2Mn plastic mold steel plate. Background technique [0002] The current world economic situation is complex and changeable. Traditional industries led by iron and steel are facing the dual pressure of overcapacity and rising manufacturing costs. The iron and steel industry is facing an era of meager profits. Optimizing production technology, improving product quality, and establishing a brand image can help enhance the market competitiveness of an enterprise, especially the production transformation led by scientific and technological innovation is the core element for an enterprise to last forever. [0003] For the manufacture of extra-thick plates, traditional steel ingots are low in efficiency, high in cost, and poor in quality stability; continuous casting slabs are limited by the thickness of the billet. For the plastic mold industry, which is cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46C21D8/02B29C33/38
Inventor 何广霞黄军苗丕峰李经涛吴扬葛恒贵年博文
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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