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Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof

A technology for stress corrosion cracking and sulfide resistance, which is applied in the field of steel plate manufacturing for pressure vessels to achieve the effects of favorable construction and manufacturing, stable performance and good anti-lamellar tearing performance

Inactive Publication Date: 2014-06-18
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a 500MPa-class steel plate for pressure vessels resistant to sulfide stress corrosion cracking and its production method, the clean steel control technology of the present invention, the intelligent soft reduction technology of casting slabs, and the two slow cooling of continuous casting slabs and steel plates The combination of technology and other processes solves the problem of a small amount of secondary phases in the shape of short strips along the rolling direction caused by the composition segregation of the continuous casting slab crystallization process during rolling

Method used

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  • Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof
  • Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof
  • Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The 500MPa steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is prepared from the following components by mass percentage: C: 0.17%, Si: 0.37%, Mn: 1.29%, P: 0.010%, S : 0.001%, Nb+V+Ti: ≤0.060%, Alt: 0.035%, the rest is Fe and unavoidable impurities, of which O, N, and H contents are 0.0018%, 0.0035% and 0.00015%, respectively.

[0033] The thickness of the finished steel plate is 16mm.

[0034] The preparation method of described steel plate, comprises the following steps:

[0035] (1) Hot metal pretreatment: raw material hot metal P=0.080%, S=0.024%, As=0.0020%. After KR hot metal pretreatment and deep desulfurization treatment, the S content of hot metal is 0.0006%.

[0036](2) Converter smelting: In the final composition: C=0.09%, P=0.0080%, S=0.0078%, when tapping the steel, use the slag blocking rod and the slag blocking plug to tap the steel, the tapping time is 5 minutes, and the tapping time is 5 minutes. The pro...

Embodiment 2

[0045] The 500MPa steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is prepared from the following components by mass percentage: C: 0.18%, Si: 0.36%, Mn: 1.33%, P: 0.009%, S : 0.001%, Nb+V+Ti: ≤0.090%, Alt: 0.032%, the rest is Fe and unavoidable impurities, of which O, N, and H contents are 0.0023%, 0.0020% and 0.00013%, respectively.

[0046] The thickness of the finished steel plate is 42mm.

[0047] The production and preparation method of the 500MPa grade steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is the same as in Example 1, the difference is that the S content after the molten iron pretreatment is 0.0010%, and the P and S contents in the converter end point components are respectively 0.0078% and 0.0075%, the RH furnace vacuum time is 15 minutes, the soft argon blowing and weak stirring time after the RH station feeds the line is 16 minutes, the continuous casting slab exi...

Embodiment 3

[0049] The mass percent and components of the 500 MPa grade sulfide stress corrosion cracking-resistant steel plate for pressure vessels in this embodiment are the same as those in Embodiment 2.

[0050] The thickness of the finished steel plate is 70mm.

[0051] The production and preparation method of the 500MPa grade steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is the same as in Example 1, the difference is that the S content after the molten iron pretreatment is 0.0010%, and the P and S contents in the converter end point components are respectively 0.0078% and 0.0075%, the RH furnace vacuum time is 15 minutes, the soft argon blowing and weak stirring time after the RH station feeds the line is 16 minutes, the continuous casting slab exits the heating furnace temperature 1160°C, the rough rolling start rolling temperature is 1145°C, and the thickness of the intermediate billet is 140mm , the finishing rolling temperature i...

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Abstract

The invention relates to the field of manufacturing of a steel plate for a pressure container, and particularly relates to a steel plate for a 500MPa-level pressure container for resisting sulfide stress corrosion cracking and a production method thereof. The steel plate is prepared from the following components by mass percent: no more than 0.20% of C, 0.15-0.50% of Si, no more than 1.35% of Mn, no more than 0.012% of P, no more than 0.002% of S, no more than 0.10% of Nb, V and Ti, 0.020-0.050% of Alt, and the balance of Fe and inevitable impurities. The steel plate has the beneficial effects that each component is accurately controlled in the smelting process, the content of harmful elements such as P, S and the like in steel is strictly controlled, the cleanliness of molten steel is improved, a continuous casting blank is heated after being slowly cooled by a burial pit or a slow cooling cover, and the steel plate for the pressure container having the advantages of resisting sulfide stress corrosion cracking, hydrogen-induced cracking and lamellar tearing, high temperature resistance, being easy to weld, and the like is obtained by reasonably controlling slowly cooling and normalizing heat treatment processes of rolled and steel plates.

Description

technical field [0001] The invention relates to the field of manufacturing steel plates for pressure vessels, in particular to a 500MPa-class steel plate for pressure vessels resistant to sulfide stress corrosion cracking and a production method thereof. Background technique [0002] Corrosion is one of the main forms of threats to the safety of steel plates for transportation and storage of oil (gas) containers. It is often the root cause of steel plate fractures and catastrophic accidents, while sulfide stress corrosion cracking (SSCC) (HIC) Two different types of corrosion cracking are the main forms of corrosion damage in sour natural gas and oil (gas). In today's world, on the one hand, with the increasing demand for natural gas and oil (gas) in human society, many natural gas and oil (gas) containing hydrogen sulfide (H2S) are exploited, transported and processed; On the other hand, with the increase of pipeline delivery pressure and pressure vessel storage pressure, ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 邵正伟成小龙孙风晓刘金泉刘晓东刘建伟谢晖孔冠宏董连委胡根荣
Owner JIGANG GRP
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