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Low temperature tenacity excellent low yield ratio high intensity steel plate for welding heat influenced part and mother plate, and manufacturing method thereof

A steel plate and quality technology, applied in the field of low yield ratio and high tension steel plate, can solve the problems of inability to achieve safety and parallelism, and achieve the effect of excellent low temperature toughness and excellent toughness

Inactive Publication Date: 2011-03-16
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of Nb, Mo, etc. does not achieve the same toughness as the HAZ, and the toughness of the base material cannot be achieved at a level that can further ensure safety (-90°C or less in terms of fracture transition temperature vTrs)

Method used

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  • Low temperature tenacity excellent low yield ratio high intensity steel plate for welding heat influenced part and mother plate, and manufacturing method thereof
  • Low temperature tenacity excellent low yield ratio high intensity steel plate for welding heat influenced part and mother plate, and manufacturing method thereof
  • Low temperature tenacity excellent low yield ratio high intensity steel plate for welding heat influenced part and mother plate, and manufacturing method thereof

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Embodiment Construction

[0020] The inventors of the present invention have conducted studies from various angles in order to realize a high-tensile steel sheet excellent in low-temperature toughness of the HAZ and the base material. As a result, it was found that in order to ensure the toughness of the HAZ, if the C is set to be less than 0.09% and the Si is set to be less than 0.25%, and the chemical composition is adjusted, the bands composed of TiN and BN can be produced to the maximum extent. The effect of refining the grains in the austenite grains, and allowing a specified amount of solid solution N to exist in the island martensite (MA), can stabilize the retained austenite (retained γ), and in MA By ensuring a predetermined amount of residual γ in the steel sheet, the strength and toughness of the steel plate (base material) can be balanced, and the present invention has been completed.

[0021] In the high-tensile steel sheet of the present invention, in the microstructure at the t / 4 (t: pla...

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Abstract

The invention discloses a high-tension steel plate with a low tensile ratio, which satisfies the specified chemical composition component, and is composed of following mixed organization: in a microscopic constitution at a position of t / 4 (t: thickness of the plate), ferrolity percent in the whole organization is 60-85 surface percent; island shaped martensite percent is 1-5 surface percent; the excess is bainite constitution. Besides, remnant austenite in the island shaped martensite has over 60 surface percent. Based on the composition, low-temperature flexibility of HAZ is still excellent even when welding is carried out through high heat energy input; besides, the low-temperature flexibility of parent metal (steel plate) is also excellent.

Description

technical field [0001] The present invention relates to a low-yield-ratio high-strength steel sheet excellent in low-temperature toughness of the welded heat-affected zone and the base material, and is used in applications exposed to low temperatures, such as a multifunctional container that can carry liquefied ammonia and liquefied propane gas together. Low-yield-ratio high-tensile steel plate with excellent low-temperature toughness of welded heat-affected zone and base material. In addition, the present invention is not limited to the welding method of the above-mentioned high-tensile steel plate, but can be applied to submerged arc welding, gas-electric welding, etc., and the following is only a single-sided submerged submerged welding method that ensures the toughness of the weld-affected part, which is particularly difficult to input high heat energy. The implementation of arc welding will be described as an example. Background technique [0002] In recent years, in o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
CPCY02P10/20C21D8/0226C21D8/0263C21D9/46C21D2211/002C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/14
Inventor 高桥祐二
Owner KOBE STEEL LTD
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