A kind of continuous casting slab to produce low compression ratio high performance extra-thick steel plate and its manufacturing method

A low compression ratio, extra-thick steel plate technology, applied in the field of steel plate manufacturing, can solve the problems of small product thickness, low production cost, and inconspicuous advantages of comprehensive mechanical properties, to improve internal quality, improve purity, and unique production methods. Effect

Active Publication Date: 2017-10-24
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above existing processes all adopt the direct rolling process of continuous casting slabs to produce extra-thick steel plates, the compression ratio has not exceeded 2.0, the product thickness is small, and the advantages of comprehensive mechanical properties are not obvious
[0005] Based on the above existing technologies, the applicant proposes a continuous casting slab to produce low-compression ratio high-performance extra-thick steel plates and its manufacturing method. Under the condition that the compression ratio is lower than 2.0, the steel plate still has good internal quality and excellent comprehensive mechanical properties. , lower production cost, suitable for mass production, no patents related to this process were found after searching

Method used

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  • A kind of continuous casting slab to produce low compression ratio high performance extra-thick steel plate and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The thickness of the P355NL2 steel plate of this embodiment is 250mm, and its chemical composition is calculated by weight percentage: C: 0.12%, Si: 0.25%, Mn: 1.50%, P: 0.005%, S: 0.001%, Nb: 0.03%, V: 0.03%, Alt: 0.030%, Ni: 0.45%, H: 0.00006%, O: 0.0015%, N: 0.0035%, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq≤0.45%, 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] 450mm thick continuous casting slab is produced by two-fire process, production process route: KR pretreatment→converter smelting→LF refining→RH refining→slab continuous casting→slab slow cooling→slab heating→slab rolling →Slow cooling of the intermediate billet→Heating of the intermediate billet→Rolling of the finished steel plate→Slow cooling of the steel plate→Flaw detection→Normalizing→Finishing→Inspection→Storage.

[0044] 1) Smelting process

[0045] Improving the purity of mol...

Embodiment 2

[0058] The thickness of the pressure vessel steel plate in this embodiment is 250mm, and its chemical composition is calculated by weight percentage: C: 0.13%, Si: 0.28%, Mn: 1.52%, P: 0.006%, S: 0.001%, Nb: 0.025% , V: 0.03%, Alt: 0.035%, Ni: 0.43%, H: 0.00010%, O: 0.0012%, N: 0.0036%, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq≤0.45%, calculated The formula is: Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. .

[0059] The manufacturing process of the steel plate is as follows:

[0060] 450mm thick continuous casting slab is produced by two-fire process, production process route: KR pretreatment→converter smelting→LF refining→RH refining→slab continuous casting→slab slow cooling→slab heating→slab rolling →Slow cooling of the intermediate billet→Heating of the intermediate billet→Rolling of the finished steel plate→Slow cooling of the steel plate→Flaw detection→Normalizing→Finishing→Inspection→Storage.

[0061] 1) Smelting process

[0062] Improving the ...

Embodiment 3

[0075] The thickness of the pressure vessel steel plate in this embodiment is 250mm, and its chemical composition is calculated by weight percentage: C: 0.12%, Si: 0.26%, Mn: 1.55%, P: 0.006%, S: 0.001%, Nb: 0.032% , V: 0.028%, Alt: 0.032%, Ni: 0.45%, H: 0.00011%, O: 0.0012%, N: 0.0035%, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq≤0.45%, calculated The formula is: Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15.

[0076] The manufacturing process of the steel plate is as follows:

[0077] 450mm thick continuous casting slab is produced by two-fire process, production process route: KR pretreatment→converter smelting→LF refining→RH refining→slab continuous casting→slab slow cooling→slab heating→slab rolling →Slow cooling of the intermediate billet→Heating of the intermediate billet→Rolling of the finished steel plate→Slow cooling of the steel plate→Flaw detection→Normalizing→Finishing→Inspection→Storage.

[0078] 1) Smelting process

[0079] Improving the pu...

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Abstract

A low compression ratio, high-performance, and super-thick steel plate produced using continuous cast billet. The chemical composition of the steel plate, by mass percentage, is: C: 0.08-0.15%; Si: 0.15-0.35%; Mn: 1.40-1.60%; P: ≤ 0.008%; S: ≤ 0.002%; Al: 0.02-0.05%; Nb: 0.02-0.05%; V: 0.02-0.05%; Ni: 0.20-0.50%; and the remainder of Fe and unavoidable impurities. The production technique comprises: KR pre-treatment → Converter smelting → LF refining → RH refining → Continuous slab casting → Slow-cooling of slab → Slab heating → Billet rolling → Slow-cooling of central inner region of billet → Heating of central inner region of billet → Rolling of finished steel slab → Slow cooling of steel slab → Defect testing → Annealing → Finishing → Inspection → Warehousing.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to an extra-thick steel plate with a thickness of 250 mm for a high-performance pressure vessel and a manufacturing method thereof. Background technique [0002] Extra-thick steel plates generally refer to steel plates with a thickness greater than 100mm, which are mostly used in important military and civilian structures, and have strict requirements on the internal quality, welding performance, low-temperature impact performance and lamellar tear resistance of the product. With the increase of my country's infrastructure construction projects, the market demand for extra-thick steel plates is increasing, and it is developing in the direction of large thickness, large unit weight, and high-quality performance. At present, the billets for the production of extra-thick steel plates generally include forging billets, blooming billets, continuous casting billets, di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/08C22C33/04B22D11/00C21D8/02
CPCC21D8/02C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 刘海宽李经涛高助忠张建张军恽鹏程
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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