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Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding

A technology of high-energy welding and manufacturing method, applied in the field of iron and steel production, can solve the problems of unqualified flaw detection and reduced strength of the welding area, so as to reduce the original austenitized grain size, improve the weldability, and promote the Bain The effect of body generation

Inactive Publication Date: 2021-08-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the calcium treatment process is widely used in steel mills, which is prone to produce calcium aluminate inclusions, and the inclusions continue to expand during the welding process, resulting in a decrease in the strength of the welded area and unqualified flaw detection

Method used

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  • Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding
  • Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding
  • Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding

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Experimental program
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Effect test

Embodiment 1

[0035] This embodiment provides a method for manufacturing thick-walled high-strength ship plate steel for large heat input welding. The chemical composition and mass percentage of the steel plate are as follows:

[0036] C: 0.065%, Si: 0.15%, Mn: 1.55%, P: 0.006%, S: 0.0013%, Nb: 0.023%, V: 0.026%, Ti: 0.013%, Cr: 0.12%, Ni: 0.33%, Mo: 0.03%, Cu: 0.23%, B: 0.00010%, Al: 0.029%, Mg: 0.0016%, N: 0.0031%, H: 0.00012%, As: 0.004%, Sn: 0.002%, Sb: 0.001%, Bi: 0.003%, Pb: 0.0001%, Ca is not added, and the balance is Fe and impurities.

[0037] Above-mentioned steel plate manufacturing method comprises the following steps:

[0038] S1. Use converter or electric furnace for molten steel smelting, LF+RH refining, vacuum deoxidation, and feed magnesium-aluminum wire, magnesium content 0.0031%, static stirring for 15 minutes after magnesium treatment;

[0039]S2. The continuous casting adopts ventilated nozzles to ensure smooth casting, and the superheat meets 23°C. Electromagnetic st...

Embodiment 2

[0044] The difference between the manufacturing method of thick-walled high-strength ship plate steel for large heat input welding provided by this embodiment and that of Embodiment 1 is that the chemical composition and mass percentage of the steel plate are as follows:

[0045] C: 0.066%, Si: 0.19%, Mn: 1.59%, P: 0.007%, S: 0.0012%, Nb: 0.029%, V: 0.027%, Ti: 0.016%, Cr: 0.19%, Ni: 0.37%, Mo: 0.03%, Cu: 0.23%, B: 0.00020%, Al: 0.029%, Mg: 0.0016%, N: 0.0041%, H: 0.00011%, As: 0.002%, Sn: 0.0016%, Sb: 0.0012%, Bi: 0.0001%, Pb: 0.00005%, Ca is not added, and the balance is Fe and impurities.

Embodiment 3

[0047] The difference between the manufacturing method of thick-walled high-strength ship plate steel for large heat input welding provided by this embodiment and that of Embodiment 1 is that the chemical composition and mass percentage of the steel plate are as follows:

[0048] C: 0.079%, Si: 0.28%, Mn: 1.69%, P: 0.005%, S: 0.0011%, Nb: 0.039%, V: 0.039%, Ti: 0.016%, Cr: 0.26%, Ni: 0.38%, Mo: 0.03%, Cu: 0.29%, B: 0.00030%, Al: 0.037%, Mg: 0.0027%, N: 0.0043%, H: 0.00021%, As: 0.0055%, Sn: 0.0022%, Sb: 0.002%, Bi: 0.0001%, Pb: 0.00009%, Ca is not added, and the balance is Fe and impurities.

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Abstract

The invention discloses a manufacturing method of thick-wall high-strength ship plate steel for high heat input welding, and relates to the technical field of steel production. A high-cleanliness smelting blank is obtained through a magnesium metallurgy technology by adopting a converter and RH vacuum treatment, a high-reduction rolling deformation technology is carried out below a recrystallization temperature according to a metallurgical principle technology, by means of magnesium metallurgy, growth of austenite grains is effectively controlled in microalloy, the thick-wall high-strength ship plate with fine grains and excellent performance is obtained in cooperation with the after-rolling rapid cooling process, a yield strength ranges from 400 MPa to 600 MPa, and the requirement for high heat input welding is met.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for manufacturing thick-walled high-strength ship plate steel for large heat input welding. Background technique [0002] With the development of the economy, my country's shipbuilding technology has made rapid progress, and has completely become a major shipbuilding country in the world. At the same time, my country's steel consumption for ship plates also ranks first in the world. While the shipbuilding level of shipbuilding enterprises is developing rapidly, the quality requirements for shipbuilding steel are getting higher and higher, which promotes the rapid development of my country's ship plate manufacturing industry. The development of steel with high technical requirements and high added value is more prominent. Among them, TMCP Thick-walled, high-strength steel plates with excellent welding performance in rolling technology have been developed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06B22D11/12C21C7/00C21C7/10C21D8/02C22C38/00C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C22C38/60
CPCB22D11/1206C21C7/0006C21C7/0056C21C7/10C21D8/0205C21D8/0226C21D8/0263C21D2211/002C21D2211/005C22C33/06C22C38/001C22C38/002C22C38/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C22C38/60
Inventor 吴俊平
Owner NANJING IRON & STEEL CO LTD
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