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High-die-welded low-temperature container steel plate with medium thickness and high toughness and production method thereof

A low-temperature container and production method technology, applied in the field of iron and steel smelting, can solve the problems of unstable weldability, unstable impact performance, poor production performance, etc., achieve simple production process, good strength and toughness, and reduce the complexity of impact component design problem effect

Active Publication Date: 2020-06-12
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of poor production performance of medium-thickness, high-toughness, high-mold welded low-temperature container steel plates in the prior art, and intends to provide a medium-thickness, high-toughness, high-mold welded low-temperature container steel plate and its production method. The steel plate of the present invention The mechanical properties meet the requirements of technical standards, and its actual level reaches: 1 / 4 thickness and 1 / 2 thickness tensile strength ≥ 550MPa, at the same time - 45 ℃, 1 / 4 thickness and 1 / 2 thickness transverse impact energy Akv ≥ 100J, the sample After 630°C, the holding time reaches 560min to simulate welding heat treatment, the tensile strength of 1 / 4 thickness and 1 / 2 thickness is ≥510MPa, and at the same time -45°C, the transverse impact energy Akv of 1 / 4 thickness and 1 / 2 thickness is ≥100J, with Good strength and toughness performance; the production method of the present invention is based on the ASMESA-516 / SA-516 standard, through reasonable alloying composition design, and adopts cast slabs to produce medium-thickness, high-toughness, high-mode welded low-temperature container steel, and successfully solves the problem of medium-thickness steel plates. The application of the project requires high-mode welding technology requirements, and the technical difficulties in the production of low-temperature high-strength container steel at 1 / 2 thickness position are unstable in impact performance and weldability

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  • High-die-welded low-temperature container steel plate with medium thickness and high toughness and production method thereof
  • High-die-welded low-temperature container steel plate with medium thickness and high toughness and production method thereof
  • High-die-welded low-temperature container steel plate with medium thickness and high toughness and production method thereof

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Embodiment 1

[0032] A medium-thickness, high-toughness, high-form welding low-temperature container steel plate in this embodiment, the chemical composition of the steel plate, in terms of weight percentage, includes C: 0.15%, Si: 0.35%, Mn: 1.28%, P: 0.007%, S: 0.0009%, Ni: 0.30%, Nb: 0.015%, Alt: 0.055%, Ceq: 0.38%, the balance is Fe and unavoidable impurities. The microstructure of the steel plate is ferrite + pearlite + shellfish Tensitic structure, the grain size is controlled at 10μm-12μm, and the grain size is controlled at level 9.

[0033] The production method of this container steel plate in the present embodiment is as follows:

[0034] S1. Converter steelmaking: the chemical composition of molten steel is calculated by weight percentage, including C: 0.15%, Si: 0.35%, Mn: 1.28%, P: 0.007%, S: 0.0009%, Ni: 0.30%, and Nb: 0.015%, Alt: 0.055%, Ceq: 0.38%, and the balance is Fe and unavoidable impurities.

[0035]S2. Out of the furnace and rolling: In this embodiment, a slab wit...

Embodiment 2

[0044] A medium-thickness, high-toughness, high-mode welded low-temperature container steel plate in this embodiment, the chemical composition of the steel plate, in terms of weight percentage, includes C: 0.15%, Si: 0.35%, Mn: 1.29%, P: 0.007%, S: 0.0009%, Ni: 0.31%, Nb: 0.016%, Alt: 0.057%, Ceq: 0.39%, and the balance is Fe and unavoidable impurities.

[0045] The production method of this container steel plate in the present embodiment is as follows:

[0046] S1. Converter steelmaking: the chemical composition of molten steel is calculated by weight percentage, including C: 0.15%, Si: 0.35%, Mn: 1.29%, P: 0.007%, S: 0.0009%, Ni: 0.31%, and Nb: 0.016%, Alt: 0.057%, Ceq: 0.39%, and the balance is Fe and unavoidable impurities.

[0047] S2, out of the furnace and rolling: In this embodiment, a slab with a thickness of 260mm is used, the temperature of the billet heating section is 1220-1240°C, the soaking temperature is 1209°C, the time of the soaking section is 56min, the bi...

Embodiment 3

[0053] A medium-thickness, high-toughness, high-mode welded low-temperature container steel plate in this embodiment, the chemical composition of the steel plate, in terms of weight percentage, includes C: 0.17%, Si: 0.35%, Mn: 1.35%, P: 0.006%, S: 0.0007%, Ni: 0.28%, Nb: 0.019%, Alt: 0.063%, Ceq: 0.41%, and the balance is Fe and unavoidable impurities.

[0054] The production method of this container steel plate in the present embodiment is as follows:

[0055] S1. Converter steelmaking: the chemical composition of molten steel is calculated by weight percentage, including C: 0.17%, Si: 0.35%, Mn: 1.35%, P: 0.006%, S: 0.0007%, Ni: 0.28%, and Nb: 0.019%, Alt: 0.063%, Ceq: 0.41%, and the balance is Fe and unavoidable impurities.

[0056] S2. Out of the furnace and rolling: In this embodiment, a slab with a thickness of 260mm is used. The temperature of the billet heating section is 1220-1240°C, the soaking temperature is 1211°C, the soaking section time is 57min, the billet is...

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Abstract

The invention discloses a high-die-welded low-temperature container steel plate with medium thickness and high toughness and a production method thereof, and belongs to the field of steel making. Thesteel plate is prepared from, by weight percentage, 0.15-0.17% of C, 0.30-0.40% of Si, 1.25-1.35% of Mn, 0-0.008% of P, 0-0.002% of S, 0.28-0.32% of Ni, 0.013-0.019% of Nb, 0.035-0.065% of Alt, 0-0.42% of C+Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15, and the balance Fe and inevitable impurities. The steel plate can achieve the performance that the tensile strength at the 1 / 4 thickness and 1 / 2 thickness is largerthan or equal to 550 MPa, besides, the transverse impact work Akv at minus 45 DEG C and the 1 / 4 thickness and 1 / 2 thickness is larger than or equal to 100 J, and the toughness is high. According to the production method, on the basis of the ASMESA-516 / SA-516 standard and the reasonable alloying component design, casting blanks are adopted for producing high-die-welded low-temperature container steel with medium thickness and high toughness, and the technological difficulty that the impact property and weldability of the produced low-temperature high-strength container steel at the 1 / 2 thickness are unstable under the technical requirements of high die welding for steel plates with medium thickness in project application is successfully overcome.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, more specifically, to a medium-thick, high-toughness, high-mode welded low-temperature container steel plate and a production method thereof. Background technique [0002] A medium-thick, high-mold welded low-temperature container steel plate has become an important metal material for the manufacture of petrochemical low-temperature container equipment such as gas absorption towers, large gas condensers, and chemical pipelines. There is no report on the production method of low-temperature container steel plate with high core impact toughness. [0003] At present, many domestic steel mills are researching the production process of high-strength, medium-thickness, high-mold welded low-temperature container steel, but there is no report on the production and manufacturing methods of medium-thickness, high-mold welded and low-temperature core impact of slab production. The actual en...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/06C21D8/02C21D1/28
CPCC22C38/02C22C38/04C22C38/08C22C38/12C22C38/06C21D8/0226C21D8/0263C21D1/28C21D2211/005C21D2211/009C21D2211/002
Inventor 李长宏王维君孙小雨张束宏李文军
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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