Large-thickness high-performance SA302GrC steel plate and production method thereof

A production method and large-thickness technology, applied in the field of iron and steel smelting technology, can solve problems such as production difficulties, and achieve the effects of simple production and manufacturing procedures, increased supercooling, and improved strength

Active Publication Date: 2013-09-18
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the very strict requirements on the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The actual composition (by weight percentage) of the SA302GrC steel of the present invention is: C 0.16%, Si 0.24%, Mn 1.33%, P 0.012%, S 0.002%, Al 0.028%, V 0.006%, Ni 0.46%, Cr 0.04% , Mo 0.52%, Cu 0.07%, Ti 0.002%, Ceq 0.53%, rolled into 135mm steel plate. Its mechanical properties: yield strength: 452MPa, tensile strength: 595MPa, yield strength ratio: 0.76, A%: 28%, -10°C impact energy AKV (transverse direction): 131, 143, 151J, Z direction: 45%.

Embodiment 2

[0023] The actual composition (by weight percentage) of the SA302GrC steel of the present invention is: C 0.11%, Si 0.20%, Mn 1.30%, P 0.010%, S 0.002%, Al 0.025%, V 0.004%, Ni 0.42%, Cr 0.05% , Mo 0.50%, Cu 0.07%, Ti 0.002%, Ceq 0.47%, rolled into 135mm steel plate. Its mechanical properties: yield strength: 435MPa, tensile strength: 575MPa, yield strength ratio: 0.76, A%: 28%, -10°C impact energy AKV (transverse direction): 135, 142, 155J, Z direction: 50%.

Embodiment 3

[0025] The actual composition (by weight percentage) of the SA302GrC steel of the present invention is: C 0.17%, Si 0.35%, Mn 1.40%, P 0.011%, S 0.002%, Al 0.028%, V 0.006%, Ni 0.50%, Cr 0.04% , Mo 0.57%, Cu 0.07%, Ti 0.002%, Ceq 0.56%, rolled into 135mm steel plate. Its mechanical properties: yield strength: 445MPa, tensile strength: 582MPa, yield strength ratio: 0.76, A%: 29%, -10°C impact energy AKV (transverse direction): 125, 128, 118J, Z direction: 45%.

[0026] The processing steps of each embodiment are as follows:

[0027] ① Smelting process: The mass percentages of the chemical components of molten steel are as follows: C 0.10-0.18%, Si 0.15-0.40%, Mn 1.20-1.45%, P ≤0.015%, S ≤0.010%, Ni 0.40-0.55%, Mo 0.45-0.60 %, the rest is Fe and unavoidable impurities. The molten steel is first smelted in an electric furnace. When P≤0.012%, the ladle temperature is ≥1570℃, the steel is tapped, and the LF furnace is refined. The white slag retention time is ≥25 minutes, and the ...

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Abstract

The invention relates to a large-thickness high-performance SA302GrC steel plate and a production method thereof, belonging to the technical field of steel smelting processes. According to the technical scheme, the production method comprises procedures of smelting, casting, heating, rolling, cooling after rolling, normalizing, accelerated cooling and tempering; and the steel plate is prepared from the following chemical ingredients in percentage by mass: 0.10-0.18% of C, 0.15-0.40% of Si, 1.20-1.45% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.40-0.55% of Ni, 0.45-0.60% of Mo, and the balance of Fe and inevitable impurities. The steel plate has the following advantages that the obdurability matching is good, the yield strength Re is greater than or equal to 345Mpa, the transverse Charpy impact in the position which is 1/4 of the plate thickness at minus 10 DEG C is less than 41J, the steel quality is purer, the lamellar tearing resisting property is good, the through thickness direction Z is greater than or equal to 35%, the welding property is good, and the thickness of the steel plate is 135mm. The steel plate which is produced by using the production method provided by the invention has the characteristics of high purity, uniformity in component and internal compactness, and has good obdurability matching.

Description

technical field [0001] The invention relates to a large-thickness high-performance SA302GrC steel plate and a production method thereof, in particular to a large-thickness high-performance SA302GrC steel plate of 135mm, belonging to the technical field of iron and steel smelting technology. Background technique [0002] In recent years, the development of the petrochemical industry is mainly centered on the secondary deep processing of the coal chemical industry and the large-scale installation, marked by the application of high temperature and high pressure technology. The service conditions of the steel plate are harsh, and the material has been exposed to high temperature, high pressure and hydrogen for a long time. In addition to meeting the basic mechanical properties at room temperature, the material also needs to meet the requirements of strength at high temperature, resistance to temper embrittlement and hydrogen corrosion. Because of the very strict requirements on ...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04C21D8/02
Inventor 袁锦程韦明刘生张萌吴艳阳牛红星高雅尹卫江王全胜秦红新
Owner WUYANG IRON & STEEL
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