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High-toughness steel plate with high-temperature PWHT softening resistance and low welding crack sensitivity coefficient for crude oil storage tank and manufacturing method of high-toughness steel plate

A technology with low welding crack sensitivity coefficient, which is applied in the steel plate for large crude oil storage tanks with low welding crack sensitivity coefficient and high toughness and its preparation field, can solve the problems that the strength of the steel plate cannot be guaranteed, and achieve low reheat crack sensitivity coefficient and low welding Effect of Crack Sensitivity Factor

Active Publication Date: 2016-06-15
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the defect that the strength of the steel plate after thermal insulation simulated post-weld heat treatment cannot be guaranteed, and through reasonable chemical composition design, it adopts controlled rolling and on-line controlled cooling and quenching+tempering process to produce steel plates for the construction of 100,000 m 3 -150,000m 3 High-strength and toughness steel plate with low welding crack sensitivity coefficient and high-temperature PWHT softening resistance for large crude oil storage tanks

Method used

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  • High-toughness steel plate with high-temperature PWHT softening resistance and low welding crack sensitivity coefficient for crude oil storage tank and manufacturing method of high-toughness steel plate
  • High-toughness steel plate with high-temperature PWHT softening resistance and low welding crack sensitivity coefficient for crude oil storage tank and manufacturing method of high-toughness steel plate
  • High-toughness steel plate with high-temperature PWHT softening resistance and low welding crack sensitivity coefficient for crude oil storage tank and manufacturing method of high-toughness steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The chemical composition and weight percentage of the steel plate are:

[0047] C: 0.10%, Si: 0.21%, Mn: 1.53%, S: 0.007%, P: 0.013%, Mo: 0.07%, Ni: 0.24%, Nb: 0.023%, V: 0.051%, Ti: 0.016%, Alt: 0.021%, O: 0.0023%, N: 0.0038%, H: 0.00015%, and the rest are Fe and trace impurities. P cm 0.20%, P SR was -1.11%. in

[0048] P cm =C+Si / 30+(Mn+Cu+Cr) / 20+Ni / 60+Mo / 15+V / 10+5B

[0049] P SR =Cr+Cu+2Mo+10V+7Nb+5Ti-2

[0050] The manufacturing method of the high-strength toughness steel plate for large crude oil storage tank with low welding crack sensitivity coefficient softening at high temperature and PWHT is as follows:

[0051] (1) Smelting: The molten iron is processed by KR pretreatment, 120-ton top-bottom combined blowing converter smelting, 120-ton LF ladle furnace refining, 120-ton RH vacuum degassing refining and slab continuous casting machine to obtain a section size of 300mm× The 2200mm continuous casting slab is heated by a walking beam heating furnace.

...

Embodiment 2

[0059] The chemical composition and weight percentage content of the steel plate produced by the method of the present invention are:

[0060] C: 0.09%, Si: 0.22%, Mn: 1.50%, S: 0.005%, P: 0.012%, Mo: 0.08%, Ni: 0.22%, Nb: 0.024%, V: 0.050%, Ti: 0.016%, Alt: 0.025%, O: 0.0024%, N: 0.0036%, H: 0.00015%, and the rest are Fe and trace impurities. P cm 0.19%, P SR was -1.09%. Among them, P cm =C+Si / 30+(Mn+Cu+Cr) / 20+Ni / 60+Mo / 15+V / 10+5B, P SR =Cr+Cu+2Mo+10V+7Nb+5Ti-2.

[0061] The production and preparation method process of the present embodiment and the cross-sectional size of the continuous casting slab are the same as in the embodiment 1, the difference is that:

[0062] (1) The final rolling thickness of the steel plate is 27mm, the finish rolling start temperature of the billet is 880°C, and the finish rolling start thickness of the billet is 3.0 times the thickness of the finished steel plate.

[0063] (2) Rolling conditions: the starting cooling temperature is 800°C, ...

Embodiment 3

[0068] The chemical composition and weight percentage content of the steel plate produced according to the method of the present invention are:

[0069] C: 0.08%, Si: 0.21%, Mn: 1.55%, S: 0.002%, P: 0.010%, Mo: 0.10%, Ni: 0.25%, Nb: 0.026%, V: 0.050%, Ti: 0.017%, Alt: 0.027%, O: 0.0020%, N: 0.0033%, H: 0.00015%, and the rest are Fe and trace impurities. P cm 0.18%, P SR was -1.03%. Among them, P cm =C+Si / 30+(Mn+Cu+Cr) / 20+Ni / 60+Mo / 15+V / 10+5B, P SR =Cr+Cu+2Mo+10V+7Nb+5Ti-2.

[0070] The production and preparation method process of the present embodiment and the cross-sectional size of the continuous casting slab are the same as in the embodiment 1, the difference is that:

[0071] (1) The final rolling thickness of the steel plate is 32mm, the finish rolling start temperature of the billet is 870°C, and the finish rolling start thickness of the billet is 3.0 times the thickness of the finished steel plate.

[0072] (2) Rolling conditions: the starting cooling temperature ...

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Abstract

The invention discloses a high-toughness steel plate with high-temperature PWHT softening resistance and a low welding crack sensitivity coefficient for a crude oil storage tank and a manufacturing method of the high-toughness steel plate. The steel plate comprises the following chemical components in percentage by mass: 0.07-0.12% of C, 0.15-0.30% of Si, 1.40-1.60% of Mn, less than or equal to 0.010% of S, less than or equal to 0.015% of P, 0.05-0.15% of Mo, 0.20-0.35% of Ni, 0.015-0.035% of Nb, 0.030-0.060% of V, 0.010-0.030% of Ti, 0.015-0.045% of Alt, less than or equal to 0.0030% of O, 0.0020-0.0045% of N, less than or equal to 0.00015% of H and the balance Fe and unavoidable trace impurities. The steel plate for the crude oil storage tank also has a relatively low welding crack sensitivity coefficient and a relatively low reheating crack sensitivity coefficient while having high toughness and high-temperature PWHT softening resistance and is suitable for constructing 100000-150000m<3> large crude oil storage tanks.

Description

technical field [0001] The present invention belongs to 100,000 m 3 -150,000m 3 The invention relates to the field of high-strength and toughness steel plate manufacturing for large crude oil storage tanks, in particular to a high-strength and toughness steel plate for large crude oil storage tanks that is resistant to high temperature simulated post-weld heat treatment (PWHT) softening and has a low welding crack sensitivity coefficient and high strength and toughness. Background technique [0002] High-strength toughness steel plates for large crude oil storage tanks generally require yield strength ≥ 490MPa, tensile strength 610-730MPa, elongation after fracture ≥ 17%, 20 transverse impact energy ≥ 80J, steel plates are delivered in a quenched and tempered state. In order to ensure that the steel plate has both high strength and toughness and good welding quality, low-carbon composition design is generally adopted, and various alloying elements such as Mn, Si, Ni, Mo, Nb...

Claims

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Application Information

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IPC IPC(8): C22C38/08C22C38/12C22C38/14C22C38/04C22C38/02C22C38/06C21D8/02
CPCC21D8/0231C21D8/0247C21D2211/002C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 黄少文马光亭周平杜显彬张长宏霍孝新王月香陈永南孙雪娇高海军王晶庄严
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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