A kind of high-strength and high-toughness marine low-temperature steel and its manufacturing method

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: 2016-01-13
ANGANG STEEL CO LTD
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  • Description
  • Claims
  • Application Information

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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

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  • A kind of high-strength and high-toughness marine low-temperature steel and its manufacturing method
  • A kind of high-strength and high-toughness marine low-temperature steel and its manufacturing method
  • A kind of high-strength and high-toughness marine low-temperature steel and its manufacturing method

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Embodiment Construction

[0032] Below in conjunction with specific embodiment the present invention is further described:

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

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

[0035] The chemical compositions of the steel of the present invention and the conventional EH36 steel are shown in Table 1.

[0036] Table 1 Invention Steel and Comparative Steel Chemical Composition (wt%)

[0037]

[0038] The cast slabs with the above compositions were subjected to two-stage rolling. Invention steels 1, 2, and 3 were subjected to low-temperature heating + controlled rolling, and comparative steels 1 and 2 were subjected to conventional hot rolling. Th...

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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 for ships or ocean platforms used in polar environments, 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 higher and higher requirements for the performance of ship plates. 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 ship plates of different specifications and grades. High strength, excellent weldability and surface quality, especially excellent low-temperature impact toughness have become the key technical requirements for advanced high-strength toughness ship plates, while ordinary A, B, D, and E ship plates have...

Claims

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Application Information

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Patent Type & Authority Patents(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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