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Thick-gauge steel plate with excellent low-temperature aging performance, and manufacturing method thereof

A low-temperature aging and manufacturing method technology, applied in the field of metallurgy, can solve the problems of increasing the yield strength of steel plates and decreasing low-temperature impact toughness, and achieve the effects of excellent low-temperature aging performance, reducing low-temperature brittleness, and reducing low-temperature brittleness.

Active Publication Date: 2014-01-08
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the steel plate undergoes strain aging, the C and N in the steel will be dislocated due to the longitudinal tensile strain, so that the yield strength of the steel plate will increase and the low temperature impact toughness will decrease.

Method used

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  • Thick-gauge steel plate with excellent low-temperature aging performance, and manufacturing method thereof
  • Thick-gauge steel plate with excellent low-temperature aging performance, and manufacturing method thereof
  • Thick-gauge steel plate with excellent low-temperature aging performance, and manufacturing method thereof

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Effect test

Embodiment 1

[0042] A thick-gauge steel plate excellent in low-temperature aging performance of Example 1 having the chemical composition shown in Table 3 below was produced. Among them, No. 1 represents a steel plate with a thickness of 63.5 mm, and No. 2 represents a steel plate with a thickness of 75 mm.

[0043] Table 3 Chemical composition (wt%) of thick-gauge steel plate with excellent low-temperature aging performance in Example 1

[0044]

[0045] The thick-gauge steel plate excellent in low-temperature aging performance of Example 1 was manufactured by the following method. Specifically, the molten iron pretreatment process is carried out first, the molten iron is desulfurized, the sulfur content in the molten iron is controlled at 0.012wt%, the temperature is controlled at about 1270°C, and the slag on the surface of the molten iron is removed after desulfurization.

[0046] In the steelmaking process, the top-bottom double blowing converter is used for smelting. The pretreat...

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Abstract

The invention provides a thick-gauge steel plate with excellent low-temperature aging performance, and a manufacturing method thereof. The thick-gauge steel plate with excellent low-temperature aging performance is composed of the chemical components of, by weight: no more than 0.20wt% of C, no more than 0.50wt% of Si, no more than 1.60wt% of Mn, 0.020-0.050wt% of Nb, 0.010-0.050wt% of Ti, 0.015-0.050wt% of Als, no more than 0.015wt% of P, no more than 0.012wt% of S, and balance of Fe and unavoidable impurities. Through low-carbon micro-alloying, and through the controlling over rolling, cooling, and normalizing treatment, the steel plate has good low-temperature aging impact performance. The thick-gauge steel plate provided by the invention satisfies -50 DEG C impact work requirements before and after aging, and has uniform tissue and excellent properties. With the steel plate, an ultrasonic flaw detection requirement is satisfied, and the requirement for a structural steel plate for an offshore oil platform is satisfied.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a thick-gauge steel plate with excellent low-temperature aging performance and a manufacturing method thereof. Background technique [0002] Structural steel plates for offshore platforms generally have a specification of 60mm to 80mm. During the processing process, they must undergo cold plastic deformation including cold straightening, roll bending, molding, curling and edge bending. During the cold working process, due to the strain Aging will increase the strength of the steel plate, while the plasticity and toughness will decrease. Studies have shown that during accelerated aging, the ductile-brittle transition temperature of the steel plate will increase by 5°C for every 1% increase in work hardening. Therefore, in order to ensure the stability and safety of the steel plate during use, the low-temperature aging impact toughness is An indispensable inspection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 高立福周平王建景李灿明杨建勋李艳李新东
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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