Soldering boat deck steel in high intensity by large line energy, and manufacturing method

A large input energy welding and manufacturing method technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of reducing HAZ toughness, not easy to control, containing expensive metal vanadium, etc., and achieve low welding crack sensitivity , Reduce welding construction strength, save resources and energy

Inactive Publication Date: 2007-10-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) There is no clear regulation on the content of oxygen
Such as "Large input energy and low welding crack sensitivity series steel and its production method" (ZL 02115877.0), "High-performance fire-resistant and weather-resistant construction steel and its production method" (ZL01133562.9), "Non-quenched and tempered Tough low-temperature steel and its production method" (ZL 01128316.5), steel for high-toughness and corrosion-resistant zinc solution for high heat input welding and its production method (01128476.5), "a thick steel plate capable of high heat input welding and its manufacturing method" (CN 200510023216.0), "St

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] A large heat input welding high-strength ship plate steel and a manufacturing method thereof. The molten iron undergoes steelmaking and refining, followed by continuous casting and hot rolling; the chemical composition of the continuous casting slab is: C is 0.04~0.08wt%, Si is 0.2~0.4wt%, Mn is 1.3~1.7wt%, Als 0.02~0.06wt%, Nb is 0.05~0.07wt%, Ti is 0.01~0.05wt%, N is 0.002~0.012wt%, B is 0.0010~0.0030wt%, Ca is 0.001~0.0030wt%, P<0.010 wt%, S<0.008wt%, the rest is Fe and unavoidable impurities.

[0021] The steelmaking and refining process of this example 1 is: smelting into molten steel with a converter; measuring the oxygen content in molten steel with a rapid oxygen probe to keep the oxygen content in molten steel at 500ppm; using Fe-Ti alloy for deoxidation, and then The chemical composition of the slab is deoxidized and Ca is added; then the Al wire is used for final deoxidation, and then B is added after the final deoxidation; after the compositio...

Example Embodiment

[0024] Example 2

[0025]A large heat input welding high-strength ship plate steel and a manufacturing method thereof. The scrap steel is made and refined, then continuous casting and hot rolling; the chemical composition of the continuous casting billet is: C is 0.03~0.07wt%, Si is 0.2~0.4wt%, Mn is 1.2~1.4wt%, Als 0.03~0.06wt%, Nb is 0.03~0.06wt%, Ti is 0.02~0.05wt%, N is 0.004~0.008wt%, B is 0.0010~0.0030wt%, Mg is 0.004~0.008wt%, P<0.010 wt%, S<0.008wt%, the rest is Fe and unavoidable impurities.

[0026] The process of steelmaking and refining is: using a converter to smelt molten steel. Use a fast oxygen probe to measure the oxygen content of the steel, and keep the oxygen content in the molten steel at 300ppm; deoxidize with metal Ti, and then add Mg after deoxidation according to the chemical composition of the cast slab; then use A1 line for final deoxidation and final deoxidation Then add B; after the molten steel composition reaches the requirements, adjust the molten s...

Example Embodiment

[0029] Example 3

[0030] A large heat input welding non-quenched and tempered low-alloy high-strength ship plate steel and a manufacturing method thereof. The scrap steel is made and refined, then continuous casting and hot rolling; the chemical composition of the continuous casting billet is: C is 0.02~0.06wt%, Si is 0.1~0.3wt%, Mn is 1.3~1.7wt%, Als 0.01~0.05wt%, Nb is 0.02~0.06wt%, Ti is 0.01~0.05wt%, N is 0.006~0.0080wt%, B is 0.0016~0.0022wt%, Zr is 0.01~0.03wt%, P<0.010 wt%, S<0.008wt%, the rest is Fe and unavoidable impurities.

[0031] The steelmaking and refining process of this embodiment 3 is: smelting into molten steel with electric arc furnace; measuring the oxygen content in molten steel with a rapid oxygen probe to keep the oxygen content in molten steel at 400ppm; deoxidizing with Fe-Ti alloy, and then according to For the chemical composition of the cast slab, Zr is added after deoxidation; then the Al wire is used for final deoxidation, and B is added after the ...

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Abstract

This invention relates to a method for producing high-strength ship plate steel suitable for high heat input welding. The chemical compositions of the ship plate steel are: C 0.01-0.18 wt.%, Si 0.05-0.4 wt.%, Mn 1.0-1.8 wt.%, Als 0.001-0.06 wt.%, Nb 0.01-0.08 wt.%, Ti 0.01-0.08 wt.%, N 0.002-0.012 wt.%, B 0.0001-0.0030 wt.%, one or more of Ca, Mg and Zr 0.0001-0.030 wt.%, P less than 0.015 wt.%, S less than 0.010 wt.%, Fe and impurities. The method comprises: keeping the oxygen content in the molten steel at 10-600 ppm, performing deoxidation with Fe-Ti alloy or metal Ti after steelmaking, adding one or more of Ca, Mg and Zr, performing final deoxidation with Al wire, adding B, casting, homogenizing, rolling, relaxing, and cooling online. The obtained ship plate steel has such advantages as simple chemical compositions, simple process, and high heat input welding, and is suitable for producing ships.

Description

Technical field: [0001] The invention belongs to the technical field of high-strength steel. In particular, it relates to a high-strength ship plate steel capable of welding against large heat input (150-600kJ / cm) and a manufacturing method thereof. Background technique [0002] In recent years, with the growth of long-distance transportation in the shipbuilding industry, the large-scale container shipping has developed rapidly, from the original 6000TEU (converted by volume per 20 feet) to 8000TEU, and is currently moving to 10000TEU super Large ship development. The steel used in large container ships requires higher strength and thickness than traditional ship plates. The maximum thickness of steel plates with a yield strength (Ys) of 390MPa has reached more than 65mm, while thick plates need to be welded by traditional welding methods. For multi-layer welding, the construction efficiency is significantly reduced. The actual welding line energy of gas-electric vertical ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/14C21C7/06C21D8/02B21B37/00
Inventor 吴开明
Owner WUHAN UNIV OF SCI & TECH
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