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High-strength high-toughness low temperature steel for ship and manufacture method thereof

A manufacturing method and high-toughness technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems that affect the comprehensive performance of the ship plate, cannot be completely eliminated, and lamellar tearing, etc., to promote the formation of multi-phase structure and refinement, promoting the denaturation of inclusions, and the full effect of phase change

Active Publication Date: 2013-01-02
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ship plates produced by ordinary hot rolling often have some defects, such as pearlite bands, uneven structure in the thickness direction, element segregation and lamellar tearing caused by inclusions, etc. These defects cannot be completely eliminated even after normalizing. Elimination, thus affecting the improvement of the overall performance of the ship plate

Method used

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  • High-strength high-toughness low temperature steel for ship and manufacture method thereof
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  • High-strength high-toughness low temperature steel for ship and manufacture method thereof

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with specific embodiments:

[0033] The production process route of the high-strength and high-toughness marine low-temperature steel of the present invention is as follows:

[0034] Deep desulfurization of molten iron-converter smelting-refining outside the furnace (alloying or feeding silicon-calcium wire)-continuous casting of medium and thin slabs-heating-rough rolling-finishing rolling-laminar cooling-finished product off-line.

[0035] The chemical composition of the steel of the present invention and the traditional EH36 two comparative steels is shown in Table 1.

[0036] Table 1 Chemical composition of invention steel and comparative steel (wt%)

[0037]

[0038] The cast slabs with the above composition are rolled in two stages. The invention steels 1, 2, and 3 adopt low temperature heating + controlled rolling, and the comparative steels 1 and 2 adopt conventional hot rolling. The preparation process ...

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Abstract

The invention discloses high-strength high-toughness low temperature steel for ship and manufacture method thereof. The steel is composed of (by wt%) C 0.04-0.12, Si 0.20-0.55, Mn 0.8-1.4, P 0.005-0.015, S less than or equal to 0.005, Als 0.02-0.07, N less than or equal to 0.005, Cu 0.05-0.40, Ni 0.05-0.50, and Fe and unavoidable impurity in balance, with Ni / Cu of 1.2-1.5; and one or more than two of Nb 0.005-0.03, Ti 0.005-0.02, Ca 0.001-0.006, and Mg 0.0005-0.002. The steel has advantages of low compression ratio, high strength, good low temperature impact energy, good texture uniformity, and good elongation, to ensure low hardenability and cold crack resistance of repair welding heat-affected zone even if under polar climate condition.

Description

Technical field [0001] The invention relates to a structural steel used for ships or offshore platforms under polar environment use conditions, in particular to a high-strength and high-toughness low-temperature steel for ships and a manufacturing method thereof. Background technique [0002] The rapid development of my country's shipbuilding industry has not only accelerated the demand for the number of ship plates, but also has increasingly higher requirements for ship plate performance. In order to ensure the safety and reliability of ships, classification societies of various countries have made strict regulations on the chemical composition, mechanical properties and delivery status of different specifications and brands of ship plates. High strength, excellent weldability and surface quality, especially excellent low-temperature impact toughness have become the key technical requirements of current advanced high-strength and toughness ship plates, but ordinary A, B, D, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C21D8/02C21C1/02C21C7/06C21C7/076B21B37/00
CPCY02P10/20
Inventor 严玲叶其斌郝森周成杨玉张朝锋
Owner ANGANG STEEL CO LTD
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