Ti-Zr composite deoxidized steel used for ultrahigh-strength hull structure, and production process thereof

A technology of structural steel and ultra-high strength, which is applied in the field of low-alloy high-strength steel production, which can solve the problems of reducing the high-temperature strength of steel and achieve good cold-bending performance

Active Publication Date: 2011-09-28
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction products of aluminum deoxidation and the aluminum remaining in the steel often cause creep brittleness of the heat-resistant steel and reduce the high-temperature strength of the steel.

Method used

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  • Ti-Zr composite deoxidized steel used for ultrahigh-strength hull structure, and production process thereof
  • Ti-Zr composite deoxidized steel used for ultrahigh-strength hull structure, and production process thereof

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Embodiment Construction

[0026] A kind of Ti, Zr compound deoxidation of the present invention super-high-strength hull structure steel, design composition by weight percentage is: C: 0.09%, Si: 0.28%, Mn: 1.5%, P: 0.008%, S: 0.001%, Als: 0.006%, Nb: 0.024%, Ti: 0.012%, Zr: 0.008%, Cr+Mo+Ni+Cu=2.0%, the rest is Fe and unavoidable impurities.

[0027] The thickness specification of the finished product produced by the TMCP+RQ+T process adopted in the present invention is: 60mm, including smelting, heating, rough rolling, finish rolling, ACC, quenching, tempering processes, and the specific process steps are:

[0028] 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 1180°C, and the heating time is 266min; the rough rolling start temperature is 1100°C, and the rough rolling finish rolling temperature is 1000°C; The thickness of billet to be warmed is 90mm; the starting temperature of finish roll...

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Abstract

The invention discloses Ti-Zr composite deoxidized steel used for an ultrahigh-strength hull structure, and a production process thereof. The Ti-Zr composite deoxidized steel comprises the following chemical components in percentage by weight: 0.05-0.14% of C, 0.10-0.35% of Si, 1.0-1.6% of Mn, 0.02-0.05% of Nb, 0.007-0.02% of Ti, 0.002-0.010% of Zr, 0.001-0.020% of Als, 0.15-0.5% of Mo, 0.2-0.6% of Cr, 0.2-0.8% of Ni, 0.2-0.8% of Cu and the balance of Fe and trace impurities. The production process provided by the invention comprises the following processes of smelting, heating, rough rolling, finish rolling, ACC (accelerated controlled cooling), quenching and tempering, and the obtained ultrahigh-strength ship plate has excellent comprehensive mechanical performance.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel production, and in particular relates to an ultra-high-strength hull structure steel and a production process using Ti and Zr composite deoxidation. Background technique [0002] Hull structural materials and their performance are related to the advanced degree, service life and safety and reliability of the ship. Steel for hull structure occupies an extremely important position in shipbuilding materials. With the development of shipbuilding technology, large-scale and high-speed ships require the ability to provide steel for hull structures with high strength, good low-temperature impact toughness, and excellent welding performance. [0003] In the traditional smelting process of ship plate steel, aluminum is widely used as a deoxidizing element due to its strong affinity with oxygen. Under the conditions of induction smelting, the deoxidation rate of aluminum is very fast. After a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50
Inventor 朱爱玲武会宾张杰余伟唐荻许俊贻
Owner NANJING IRON & STEEL CO LTD
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