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Thick plate for ultra-high strength hull structure and production method thereof

A technology of ultra-high strength and production method, applied in the direction of temperature control, etc., can solve problems such as insufficient strength and toughness, complicated production process, etc., and achieve good effect of cold bending performance

Inactive Publication Date: 2011-12-21
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of complex production process and insufficient strength and toughness existing in the existing ferrite + pearlite structure ship plate steel

Method used

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  • Thick plate for ultra-high strength hull structure and production method thereof
  • Thick plate for ultra-high strength hull structure and production method thereof

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Embodiment Construction

[0022] A thick plate for ultra-high-strength hull structure of the present invention, the composition designed by weight percentage is: C: 0.06%, Si: 0.20%, Mn: 1.5%, P: 0.009%, S: 0.002%, Als : 0.03%, Nb: 0.027%, Ti: 0.015%, Cr+Mo+Ni+Cu=0.95, and the rest are Fe and unavoidable impurities.

[0023] Under the condition of 3500-steel rolling mill, slab continuous casting and TMCP process are used for production. The specific process measures of the production method are as follows:

[0024] In terms of production process, it includes smelting, heating, rough rolling, finishing rolling and ACC process.

[0025] Smelt and cast a 220mm thick slab according to the above ingredients; send the slab into the heating furnace, the tapping temperature of the heating furnace is 1200°C, and the heating time is 232min; the rough rolling start temperature is 1150°C, and the rough rolling finish rolling temperature is 1046°C; The thickness of the billet at temperature is 90mm; the start temp...

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Abstract

The invention discloses a thick plate for an ultra-high-strength hull structure. The mass percentage of the chemical composition of the thick plate is: C: 0.05-0.10%, Si: 0.1-0.55%, Mn: 1.0-1.6%, Nb: 0.02-0.05 %, Ti: 0.007-0.02%, Als: 0.020-0.050%, the balance is Fe and unavoidable impurities; among them, P<0.015%, S<0.005%, O<0.0020%, N<0.0045% in unavoidable impurities , H<0.0002%. The present invention produces ultra-high-strength hull structure thick plates through low-carbon, low-phosphorus, ultra-low-sulfur and TMCP processes under the condition of a 3500-steel rolling mill. It has good comprehensive performance and good cold-bending performance, and is a high-quality hull Structural steel.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel production, in particular to a TMCP type ultra-high-strength hull structure thick plate based on a steckel mill and a production method thereof. Background technique [0002] With the development of large and light ships and the advancement of shipbuilding technology, the shipbuilding industry has a potentially huge demand for high-quality hull structural steel. At the same time, the production status of hull structural steel is not as good as this demand trend. Many gaps emerged. [0003] Judging from the production situation of steel varieties for hull structure, the current domestic marine steel plate commonly used specifications are 10-32mm×1400-3500mm×6000-12000mm. More than 60% of the varieties are A and B ordinary strength grades, and high-strength steels are used from AH32 to FH40, but the largest proportion is still AH grade. For some wide and thin steel plates, such as 6-10...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50B21B37/74
Inventor 朱爱玲武会宾余伟许俊贻
Owner NANJING IRON & STEEL CO LTD
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