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Q345R steel plate with excellent performance under high-temperature simulated post-weld heat treatment conditions and manufacturing method of steel plate

A post-weld heat treatment and manufacturing method technology, applied in the field of steel plate manufacturing, can solve the problems of small steel plate thickness and poor performance matching, and achieve the effect of preventing grain coarsening, high strength and impact toughness

Active Publication Date: 2019-08-30
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] None of the above-mentioned patents involves steel plate products that can meet the high-temperature simulated post-weld heat treatment requirements of 690°C or 705°C, and there are disadvantages such as small steel plate thickness and poor performance matching, which cannot fully meet the needs of the development of the petrochemical industry

Method used

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  • Q345R steel plate with excellent performance under high-temperature simulated post-weld heat treatment conditions and manufacturing method of steel plate
  • Q345R steel plate with excellent performance under high-temperature simulated post-weld heat treatment conditions and manufacturing method of steel plate

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Effect test

Embodiment 1

[0041] The thickness of the steel plate in this embodiment is 20mm, and its chemical composition is calculated by weight percentage: its chemical composition is calculated by weight percentage: C: 0.165%, Si: 0.41%, Mn: 1.42%, P: 0.006%, S: 0.001 %, Al: 0.032%, Nb: 0.030%, Ti: 0.015%, Ni: 0.22%, Cu: 0.20%%, the balance is Fe and inevitable impurity elements, carbon equivalent Ceq: 0.435%, carbon equivalent calculation formula It is: Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15.

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

[0043] The 370mm section continuous casting slab is used as the blank. The specific operations of the main process are as follows:

[0044] 1) Smelting process

[0045] The raw materials for smelting are sequentially processed by KR hot metal pretreatment, converter smelting, LF refining, RH vacuum degassing treatment and slab continuous casting. After converter smelting, slag removal treatment, calcium treatment after LF refining, the ultimate vacuu...

Embodiment 2

[0054] The thickness of the steel plate in this embodiment is 50mm, and its chemical composition is calculated by weight percentage: C: 0.16%, Si: 0.42%, Mn: 1.42%, P: 0.005%, S: 0.0008%, Al: 0.034%, Nb: 0.032%, Ti: 0.016%, Ni: 0.25%, Cu: 0.21%%, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq: 0.44%, carbon equivalent calculation formula is: Ceq=C+Mn / 6 +(Cr+Mo+V) / 5+(Ni+Cu) / 15.

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

[0056] The 450mm cross-section continuous casting slab is used as the blank. The specific operations of the main process are as follows:

[0057] 1) Smelting process

[0058] The raw materials for smelting are sequentially processed by KR hot metal pretreatment, converter smelting, LF refining, RH vacuum degassing treatment and slab continuous casting. After converter smelting, slag removal treatment, calcium treatment after LF refining, the ultimate vacuum of RH vacuum treatment is 60Pa, the vacuum holding time ...

Embodiment 3

[0067] The thickness of the steel plate of this embodiment is 100mm, and its chemical composition is calculated by weight percentage: C: 0.17%, Si: 0.45%, Mn: 1.45%, P: 0.005%, S: 0.0005%, Al: 0.035%, Nb: 0.035%, Ti: 0.014%, Ni: 0.23%, Cu: 0.22%, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq: 0.445%, the carbon equivalent calculation formula is: Ceq=C+Mn / 6+ (Cr+Mo+V) / 5+(Ni+Cu) / 15.

[0068] The manufacturing process of the steel plate is as follows:

[0069] The 450mm cross-section continuous casting slab is used as the blank. The specific operations of the main process are as follows:

[0070] 1) Smelting process

[0071] The raw materials for smelting are sequentially processed by KR hot metal pretreatment, converter smelting, LF refining, RH vacuum degassing treatment and slab continuous casting. After converter smelting, slag removal treatment, calcium treatment after LF refining, the ultimate vacuum of RH vacuum treatment is 60Pa, the vacuum holding ...

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Abstract

The invention relates to a Q345R steel plate with excellent performance under high-temperature simulated post-weld heat treatment conditions. The steel plate comprises 0.16-0.20% of C, 0.25-0.45% of Si, 1.40-1.60% of Mn, 0-0.008% of P, 0-0.002% of S, 0.02-0.05% of Al, 0.02-0.05% of Nb, 0.01-0.05% of Ti, 0.10-0.30% of Ni, 0.10-0.30% of Cu and balance Fe and inevitable impurity elements, wherein thecarbon equivalent ceq is less than or equal to 0.45%. A large compression ratio design is adopted, and the main working procedures comprise smelting, two-stage rolling and normalizing heat treatment.The steel plate is in a normalizing delivery state, the delivery state surface Brinell hardness is less than or equal to 170 HB, the transverse impact energy on the 1 / 2 thickness portion of the steelplate obtained after high-temperature simulated post-weld heat treatment at -30 DEG C is larger than or equal to 100 J, the yield strength is larger than or equal to 325 Mpa, the tensile strength islarger than or equal to 500 Mpa, the elongation percentage after fracture A is larger than or equal to 25.0%, and the flaw detection of the steel plate can meet the requirements of I-grade NB / T47013.3standards.

Description

Technical field [0001] The invention belongs to the field of steel plate manufacturing, and specifically relates to a Q345R boiler and pressure vessel steel plate with a thickness of 20-100 mm and excellent performance under high-temperature simulated post-weld heat treatment conditions and a manufacturing method thereof. Background technique [0002] Q345R is the largest and most widely used boiler and pressure vessel steel plate in China. With the rapid development of economic construction and petrochemical industry manufacturing, the demand for Q345R steel plate in the market is increasing. At the same time, the design simulates the steel plate after welding. The requirements for heat treatment performance are getting higher and higher. The heat preservation temperature of simulated post-weld heat treatment is increased from 580-635℃ to 650℃. In recent years, due to the design of the same container equipment using both Q345R and hydrogen chromium molybdenum steel materials, th...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0247C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 刘海宽钱刚李经涛苗丕峰高助忠张建徐伟恽鹏程
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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