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A kind of 9ni marine cryogenic container steel plate with high flaw detection quality and its manufacturing method

A low-temperature container and steel plate technology, which is applied in the field of container steel plates, can solve the problems of long process time and high cost, and achieve the effects of good surface quality, excellent tensile properties, and excellent mechanical properties

Active Publication Date: 2019-06-07
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when producing such steel plates, major domestic steel mills basically choose the route of billet surface spraying + billet surface spraying, which is expensive and takes a long time, while the lower-cost milling process after billeting has not yet See reports of commercial manufacture

Method used

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  • A kind of 9ni marine cryogenic container steel plate with high flaw detection quality and its manufacturing method
  • A kind of 9ni marine cryogenic container steel plate with high flaw detection quality and its manufacturing method
  • A kind of 9ni marine cryogenic container steel plate with high flaw detection quality and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The thickness of the 9Ni marine low-temperature container steel plate involved in this embodiment is 42 mm, and the components and their mass percentages are: C: 0.04%, Si: 0.13%, Mn: 0.75%, P: 005%, S: 0.001%, Cr : 0.12%, Mo: 0.05%, Ni: 9.2%, Cu: 0.25%, Alt: 0.029%, Nb: 0.013%, N: 40ppm, the balance is iron and unavoidable impurity elements, carbon equivalent CEV (=C +Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15))=0.78.

[0041] The production process of the marine cryogenic container steel plate is as follows:

[0042] According to the chemical composition of the above-mentioned 9Ni marine low-temperature container steel plate, the smelting raw materials are arranged in order to carry out BOF smelting-RH refining-LF refining-RH refining-slab continuous casting-slow cooling pit slow cooling-slab heating-high pressure water descaling-slab rolling System-heating-controlled rolling-straightening-slow cooling-twice quenching-tempering.

[0043] Select high-quality pig iron and steel plat...

Embodiment 2

[0053] The thickness of the 9Ni marine low-temperature container steel plate involved in this embodiment is 26mm, and the components and their mass percentages are: C: 0.035%, Si: 0.12%, Mn: 0.77%, P: 005%, S: 0.001%, Cr : 0.12%, Mo: 0.05%, Ni: 9.2%, Cu: 0.25%, Alt: 0.029%, Nb: 0.013%, N: 40ppm, the balance is iron and unavoidable impurity elements, carbon equivalent CEV (=C +Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15))=0.77.

[0054] The production process of the marine cryogenic container steel plate is as follows:

[0055] According to the chemical composition of the above-mentioned 9Ni marine low-temperature container steel plate, the smelting raw materials are arranged in order to carry out BOF smelting-RH refining-LF refining-RH refining-slab continuous casting-slow cooling pit slow cooling-slab heating-high pressure water descaling-slab rolling System-heating-controlled rolling-straightening-slow cooling-twice quenching-tempering.

[0056] Select high-quality pig iron and steel plat...

Embodiment 3

[0067] The thickness of the 9Ni marine low-temperature container steel plate involved in this embodiment is 8mm, and the components and their mass percentages are: C: 0.034%, Si: 0.13%, Mn: 0.74%, P: 005%, S: 0.001%, Cr : 0.12%, Mo: 0.06%, Ni: 9.1%, Cu: 0.25%, Alt: 0.024%, Nb: 0.013%, N: 40ppm, the balance is iron and unavoidable impurity elements, carbon equivalent CEV (=C +Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15))=0.75.

[0068] The production process of the marine cryogenic container steel plate is as follows:

[0069] According to the chemical composition of the above-mentioned 9Ni marine low-temperature container steel plate, the smelting raw materials are arranged in order to carry out BOF smelting-RH refining-LF refining-RH refining-slab continuous casting-slow cooling pit slow cooling-slab heating-high pressure water descaling-slab rolling System-heating-controlled rolling-straightening-slow cooling-twice quenching-tempering.

[0070] Select high-quality pig iron and steel plate s...

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Abstract

The invention relates to a low-temperature container steel plate with high flaw detection quality and used for a 9Ni ship. The low-temperature container steel plate takes Fe as the basic element and comprises the following chemical components in percentage by mass: 0.03-0.05% of C, 0.10-0.14% of Si, 0.50-0.80% of Mn, 8.7-9.7% of Ni, equal to or less than 0.008% of P, equal to or less than 0.002% of S, equal to or less than 0.25% of Cr, equal to or less than 0.08% of Mo, equal to or less than 0.35% of Cu, 0.020-0.035% of Alt, 0.01-0.02% of Nb, equal to or less than 60 ppm of N, equal to or lessthan 1.2 ppm of H and the balance of unavoidable impurity elements, wherein the carbon equivalent CEV[pound sign] is 0.80. The low-temperature container steel plate has high low temperature toughness, tensile property, strength and the like; and compared with the existing steel plate of the same kind, the low-temperature container steel plate has higher surface and heart flaw detection quality and facilitates follow-up processing of the steel plate.

Description

technical field [0001] The invention relates to a container steel plate, in particular to a container steel plate that can be used in an ultra-low temperature environment and a manufacturing method thereof. Background technique [0002] With the development of the national economy and the increase of my country's steel production, the research and development and application of low-temperature steel have attracted much attention. The completion of projects such as the West-East Gas Pipeline and the Qinghai-Tibet Railway has improved my country's technical level in the field of low-temperature steel, and people have a new understanding of low-temperature steel, which has increased the use of low-temperature steel, which has also increased the research and development of low-temperature steel. intensity. Improving the performance of low-temperature steel at extreme temperatures and providing high-quality low-temperature steel for my country's economic construction has attracte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/04C22C38/02C22C38/12C22C38/16C22C38/06C22C38/44C22C38/42C22C38/48C21D8/02C21D1/18
Inventor 宁康康方寿玉袁伽利周东辉
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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