Steel plate adapting to large-linear energy welding and manufacturing method thereof

A large input energy welding and manufacturing method technology, applied in the field of iron and steel materials, can solve problems such as relatively difficult production, strict nitrogen content requirements, nozzle blockage, etc., and achieve the effects of excellent joint toughness, good low temperature toughness, and high joint toughness

Active Publication Date: 2010-03-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat input corresponding to this welding heat simulation process is only 40,000-60,00J / cm, which is not considered a large heat input, and the literature does not provide actual welding data, so it is impossible to evaluate the joint of steel under the high heat input welding condition toughness
[0011] CN200510023216.0 relates to a thick steel plate that can be welded with large heat input and its manufacturing method. It proposes to add rare earth elements and form rare earth oxides to obtain improved steel resistance Radial energy welding characteristics, but rare earth elements are active elements, and it is easy to cause nozzle blockage in the process of pouring steel, so there are many restrictions in practical applications
U.S. Patent 124759 and CN200710052132.9 provide a kind of large input energy welding high-strength ship plate steel, they all use boron, utilize wherein BN to pin the growth of austenite grain, but this method is harmful to the steel Boron content (5-15ppm) and nitrogen content are demanding, making production more difficult

Method used

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  • Steel plate adapting to large-linear energy welding and manufacturing method thereof
  • Steel plate adapting to large-linear energy welding and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The molten steel is smelted according to the chemical composition shown in Table 1. The ladle top slag is reduced during the tapping stage of the converter, the oxygen level is controlled during the refining stage, and different deoxidizers are added in order to carry out deoxidation step by step. In the continuous casting process, the continuous casting slab will be subjected to strong cooling, and its smelting and continuous casting process conditions are shown in Table 2. The steel billet is heated to 1120°C before hot rolling, the rolling temperature in the recrystallization stage is higher than 960°C, the deformation of each pass is 15-35%, the rolling temperature in the non-recrystallization stage is 800°C, the cumulative deformation is ≥ 45%, and the final rolling temperature is 760 After rolling, wait until the temperature reaches 750°C, then water-cool to 550°C at 26°C / s, and then air-cool.

Embodiment 2

[0043] Except that the billet is heated to 1150°C before hot rolling, the rolling temperature is 780°C in the non-recrystallization stage, the final rolling temperature is 770°C, and the temperature is 760°C after rolling, and then water cooled to 450°C at 18°C / s. The rest of the implementation methods are the same example 1.

Embodiment 3

[0045] Except that the billet is heated to 1100°C before hot rolling, the rolling temperature is 820°C in the non-recrystallization stage, the final rolling temperature is 760°C, and the temperature is 760°C after rolling, and then water-cooled to 490°C at 30°C / s. The rest of the implementation methods are the same. example 1.

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Abstract

The invention provides a steel plate adapting to large-linear energy welding and a manufacturing method thereof. The steel plate comprises the following chemical components: 0.05-0.12wt% of C, 1.2-1.6wt% of Mn, 0.12-0.35wt% of Si, less than or equal to 0.015wt% of P, less than or equal to 0.006wt% of S, 0.015wt% of Al, 0.005-0.02wt% of Ti, 0.008-0.05wt% of Nb, 0.0001-0.006wt% of N, less than or equal to 0.5wt% of Ni, less than or equal to 0.5wt% of Mo, 0.001-0.004wt% of Ca, the balance Fe and unavoidable impurities, wherein the equivalent carbon content is 0.32-0.43. By carrying out morphogenetic control on inclusions in a billet and adopting a rolling technology of rolling and cooling control, the invention manufactures a steel plate adapting to the large-linear energy welding. The steelplate has favorable low-temperature toughness and excellent joint toughness especially after large-linear energy welding.

Description

technical field [0001] The invention relates to the field of iron and steel materials, in particular, the invention relates to a steel plate with high welding heat-affected zone toughness under large heat input welding conditions and a manufacturing method thereof. Background technique [0002] High-strength low-alloy steel plate is an important engineering material, which is widely used in industrial fields such as shipbuilding, offshore platforms, oil and gas pipelines, bridges, high-rise buildings, pressure vessels, and machinery manufacturing. Its performance indicators include mechanical performance requirements, There are also welding performance requirements, among which the welding performance, especially the toughness of the welding heat-affected zone (HAZ), has become an important indicator related to the safety of the component. However, after the welding thermal cycle, the coarsening of HAZ grains will lead to local low toughness of the steel. Since the toughness...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21C7/06C21D8/02
Inventor 郑庆沈建国马志刚吴扣根刘自立胡会军曹能
Owner BAOSHAN IRON & STEEL CO LTD
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