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A kind of steel plate for large heat input welding and preparation method thereof

A technology for high-energy-input welding and steel plates, which is applied in the field of steel plates for high-energy-input welding and its preparation, can solve problems such as low-temperature toughness, strength, and weldability that are difficult to meet, and achieve excellent low-temperature toughness, improve yield strength, and produce The effect of simple process

Active Publication Date: 2020-05-22
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing steels are difficult to meet the comprehensive properties such as low temperature toughness, strength, and weldability that must be possessed by polar ship steel

Method used

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  • A kind of steel plate for large heat input welding and preparation method thereof
  • A kind of steel plate for large heat input welding and preparation method thereof
  • A kind of steel plate for large heat input welding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Heat the slab to 1100°C, holding time 0.5h, the first stage rough rolling start temperature is 1050°C, after 3 passes of rough rolling, the first stage rough rolling finish rolling temperature is 950°C, the second stage finish The rolling start temperature is 820°C, after 2 passes of finish rolling, the finishing rolling temperature of the second stage is 800°C, and the start rolling temperature of the third stage two-phase zone is 780°C, after 2 passes of rolling, the thickness of the steel plate is rolled to 12mm, the final rolling temperature is 760°C, and then air-cooled to room temperature.

Embodiment 2

[0060] Example 2: Heating the cast slab to 1100°C, holding time for 0.5h, the first stage rough rolling start temperature is 1058°C, after 3 passes of rough rolling, the first stage rough rolling finish rolling temperature is 965°C, the second stage finish The rolling start temperature is 816°C, after 2 passes of finish rolling, the finish rolling temperature of the second stage is 796°C, and the start rolling temperature of the third stage two-phase zone is 776°C, after 2 passes of rolling, the thickness of the steel plate is rolled to 12mm, the final rolling temperature is 757°C, and then air-cooled to room temperature.

Embodiment 3

[0061] Example 3: Heating the cast slab to 1100°C, holding time for 0.5h, the first stage rough rolling start temperature is 1065°C, after 3 passes of rough rolling, the first stage rough rolling finish rolling temperature is 960°C, the second stage finish The rolling start temperature is 800°C, after 2 passes of finish rolling, the finish rolling temperature of the second stage is 795°C, and the start rolling temperature of the third stage two-phase zone is 773°C, after 2 passes of rolling, the thickness of the steel plate is rolled to 12mm, the final rolling temperature is 754°C, and then air-cooled to room temperature.

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Abstract

The invention discloses a large-linear-energy steel plate for welding and a preparation method thereof, and belongs to the technical field of steel for polar low-temperature ships. Low-carbon V-N-Ti microalloying and B microalloying techniques are adopted, V, N, Ti and B are matched reasonably, the content of alloy elements is optimized, preparation is conducted through a three-stage rolling technology, thus the grain size of a steel plate ferrite is refined, low-temperature toughness and strength of the steel plate are improved, and the low-temperature toughness of a welding joint is improved. The compositions of the large-linear-energy steel plate comprise, by mass, 0.07-0.10% of C, 0.10-0.30% of Si, 0.5-2.0% of Mn, 0.001% or the less of S, 0.005% or the less of P, 0.02-0.06% of Als, 0.008-0.015% of Ti, 0.0008-0.0015% of B, 0.007-0.009% of N, 0.04-0.1% of V and the balance Fe and inevitable impurity elements. The solid solution nitrogen content is equal to N-0.28Ti-1.27B-0.03V, and is smaller than 0.03%, wherein N, Ti, B and V are the mass percent content of all elements. The large-linear-energy steel plate for welding can be used for building of the polar ships.

Description

technical field [0001] The invention belongs to the technical field of polar low-temperature ship steel, and in particular relates to a steel plate for high-energy-input welding and a preparation method thereof. Background technique [0002] With the gradual depletion of conventional recoverable oil and gas resources, the rich energy reserves in the Arctic region have attracted more and more attention. According to a survey completed by the US Geological Survey in 2008, the reserves of oil, natural gas and liquefied natural gas in the Arctic Circle reached 90 billion barrels, 47 trillion cubic meters and 4.4 billion barrels respectively, accounting for about 22% of the world's total undiscovered energy. At the same time, the global warming effect has intensified the warming of the Arctic, and the area covered by sea ice has continued to decrease rapidly, which is more and more conducive to resource development and ship navigation. Therefore, in recent years, polar ships hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 师仲然柴锋杨才福罗小兵王瑞珍李丽陈雪慧柴希阳
Owner CENT IRON & STEEL RES INST
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