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Preparation method of low-alloy-cost large-thickness high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel

A large thickness, high and low temperature technology, applied in the direction of manufacturing converters, etc., can solve the problem of high alloy cost, achieve the effects of low alloy cost, uniform steel plate structure and broad application prospects

Inactive Publication Date: 2021-06-22
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The publication number is CN 111270149 A, an ultra-low temperature high core impact large thickness 13MnNi6-3 container steel production method, which adopts a reasonable production process including quenching + tempering heat treatment to produce 80mm thick steel plates, and adopts the alloy composition of Nb+V+Ni Design, alloy cost is high, thickness only reaches 80mm, and only for this thickness specification, -80℃ impact temperature Akv≥135J

Method used

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  • Preparation method of low-alloy-cost large-thickness high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel
  • Preparation method of low-alloy-cost large-thickness high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel
  • Preparation method of low-alloy-cost large-thickness high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The 13MnNi6-3 steel plate used for the low-temperature pressure vessel of this embodiment has a thickness of 12 mm. The steel is smelted from the following components by mass percentage: C: 0.09%, Si: 0.26%, Mn: 1.50%, P: 0.005%, S : 0.002%, Ni: 0.35%, Nb: 0.030%, Al: 0.037%, Ti: 0.015%, and the balance is Fe and unavoidable impurities.

[0032] (1) Smelting: The molten steel is first desulfurized by KR, then smelted in the converter, sent to the LF refining furnace for refining, and the temperature of the molten steel reaches 1640°C and then transferred to the RH furnace for vacuum degassing treatment; it reaches below 200pa within 10 minutes, and the pressure holding time is ≥ 15 minutes. Add calcium-aluminum wire after vacuum degassing treatment, blow softly for 5 minutes to make the liquid steel composition uniform, and then hang the ladle to pour;

[0033] (2) Continuous casting: it is produced by a slab continuous casting machine with a section of 300mm;

[0034]...

Embodiment 2

[0044] The 13MnNi6-3 steel plate used for the low-temperature pressure vessel of this embodiment has a thickness of 50 mm. The steel is smelted from the following components in mass percentage: C: 0.08%, Si: 0.20%, Mn: 1.55%, P: 0.010%, S : 0.003%, Ni: 0.40%, Nb: 0.020%, Al: 0.050%, Ti: 0.010%, and the balance is Fe and unavoidable impurities.

[0045] (1) Smelting: The molten steel is first desulfurized by KR, then smelted in the converter, sent to the LF refining furnace for refining, and the temperature of the molten steel reaches 1640°C and then transferred to the RH furnace for vacuum degassing treatment; it reaches below 200pa within 10 minutes, and the pressure holding time is ≥ 15 minutes. Add calcium-aluminum wire after vacuum degassing treatment, blow softly for 5 minutes to make the liquid steel composition uniform, and then hang the ladle to pour;

[0046] (2) Continuous casting: it is produced by a slab continuous casting machine with a section of 300mm;

[0047]...

Embodiment 3

[0057] The 13MnNi6-3 steel plate used for the low-temperature pressure vessel of this embodiment has a thickness of 90 mm. The steel is smelted from the following components in mass percentage: C: 0.10%, Si: 0.40%, Mn: 1.40%, P: 0.008%, S : 0.001%, Ni: 0.55%, Nb: 0.025%, Al: 0.050%, Ti: 0.025%, and the balance is Fe and unavoidable impurities.

[0058] (1) Smelting: The molten steel is first desulfurized by KR, then smelted in the converter, sent to the LF refining furnace for refining, and the temperature of the molten steel reaches 1640°C and then transferred to the RH furnace for vacuum degassing treatment; it reaches below 200pa within 10 minutes, and the pressure holding time is ≥ 15 minutes. Add calcium-aluminum wire after vacuum degassing treatment, blow softly for 5 minutes to make the liquid steel composition uniform, and then hang the ladle to pour;

[0059] (2) Continuous casting: it is produced by a slab continuous casting machine with a section of 300mm;

[0060]...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of low-alloy-cost large-thickness-specification high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel. Through the alloying component design of low carbon, low manganese, 0.5% of Ni and 0.030% of Nb, casting blank production is adopted, and the reasonable controlled rolling and controlled cooling, quenching and tempering processes are utilized, so that the low-alloy-cost large-thickness-specification high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel is produced. The thickness specification of the product produced through the method covers 12-90 mm, and the low-temperature impact absorption energy KV2 of the position where the thickness is 1 / 4 and the core portion (the position where the thickness is 1 / 2) at the temperature of minus 70 DEG C is larger than or equal to 260 J. The preparation method is reasonable in component design, low in alloy cost and simple and easy in process control, the obtained steel has ultrahigh low-temperature toughness, and the preparation method has guiding significance for development of the low-temperature pressure container steel market of large-thickness-specification, low-temperature ultrahigh-impact-toughness and high-welding-performance products produced at low alloy cost.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a preparation method of 13MnNi6-3 quenched and tempered container steel with low alloy cost, large thickness, high and low temperature toughness. Background technique [0002] The rapid development of modern industrial technology has increased people's demand for energy, while the long-term use of traditional energy has caused serious environmental pollution, which is not conducive to human survival. With the enhancement of people's awareness of environmental protection, the voice of clean energy and renewable energy is getting louder and louder. As one of the most important clean energy sources, liquefied petroleum gas (LPG) has attracted more and more attention. In recent years, the petrochemical industry at home and abroad has developed rapidly, and steel plates for low-temperature and ultra-low temperature pressure vessels have been widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/30C21C7/064C21C7/10C21D8/02C21D1/18C22C38/14C22C38/12C22C38/08C22C38/04C22C38/02
CPCC22C33/04C21C5/30C21C7/064C21C7/10C21D8/0226C21D1/18C22C38/14C22C38/12C22C38/08C22C38/04C22C38/02C21D2211/002C21D2211/005
Inventor 房振业韩力强车金锋韩启彪孔雅朱士鹏汪鹏飞
Owner SD STEEL RIZHAO CO LTD
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