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Structural steel for welding with ultra-great heat input and manufacturing method thereof

A manufacturing method and technology for structural steel, applied in the direction of manufacturing converters, temperature control, etc., can solve the problems of reducing toughness, difficulty in fine dispersion, etc., and achieve the effects of improving toughness, comprehensive mechanical properties at high and normal temperature, and good low-temperature toughness.

Inactive Publication Date: 2011-06-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to finely disperse such Ti oxides in steel, and it is easy to coarsen or form aggregates in metals. If the formation of finely dispersed Ti oxides cannot be controlled, coarse Ti oxides of 5 μm or more will be formed, becoming Source of cracks and lower toughness when structures are destroyed

Method used

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  • Structural steel for welding with ultra-great heat input and manufacturing method thereof
  • Structural steel for welding with ultra-great heat input and manufacturing method thereof
  • Structural steel for welding with ultra-great heat input and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The chemical composition of the steel plate is: C: 0.03-0.10wt%; Si: 0.10-0.25wt%; Mn: 1.2-1.6wt%; P: <0.015wt%; S: <0.008%wt; Al: <0.03wt%; Cr: <0.5wt%; Mo: <0.5wt%; Nb: <0.03wt%; Ti: 0.005-0.012wt%; Ni: 0.01-0.8wt%; Cu: 0.01-0.8wt%; Mg: <0.005wt%; B: <0.002wt%; Ca: 0.0001-0.003wt%; N: 0.002-0.006wt%; O: 0.002-0.005wt%; the rest are Fe and inevitable impurities.

[0040] The carbon equivalent of the steel sheet is Ceq=C+Mn / 6+Si / 24+Ni / 40+Cr / 5+Mo / 4+V / 14(%)=0.39%.

[0041] The manufacturing process is smelting→continuous casting→rolling→cooling. The smelting process is: adding Si, Mn, Al in the converter, adjusting the oxygen content of molten steel to reach the refining stage in the range of 10-300ppm, then adding Ti, Cr, Mo, Cu in turn , Nb, Ni, Mg, B, Ca alloy elements, and control the interval time of adding each element to be 0 ~ 20min, and perform continuous casting after reaching the target chemical composition. The mold adopts weak cooling, the second cooling se...

Embodiment 2

[0047] The chemical composition of the steel plate is: C: 0.08-0.12wt%, Si: 0.18-0.25wt%, Mn: 1.4-2.0wt%, P: <0.015wt%, S: <0.008%wt%, Ti: 0.015-0.03wt%, Al: <0.03wt%, Nb: <0.03wt%, Ni: <0.5wt%, Cu: <0.5wt%, Cr: 0.01-0.5wt%, Mg: <0.003wt%, Ta : 0.0001-0.02wt%, B: <0.003wt%, Ca: 0.0001-0.003wt%; N: <0.006wt%, O: <0.005wt%, and the rest are Fe and inevitable impurities.

[0048] The carbon equivalent of the steel sheet is Ceq=C+Mn / 6+Si / 24+Ni / 40+Cr / 5+Mo / 4+V / 14(%)=0.36%.

[0049] The manufacturing process is smelting→continuous casting→rolling→cooling. The smelting process is: adding Si, Mn, Al in the converter, adjusting the oxygen content of molten steel to reach the refining stage in the range of 10-300ppm, then adding Ti, Cr, Cu, Nb in turn , Ni, Mg, Ta, B, Ca alloy elements, and control the interval time of adding each element to be 0 ~ 20min, and perform continuous casting after reaching the target chemical composition. The continuous casting process is the same as that of...

Embodiment 3

[0055] The chemical composition of the steel plate is: C: 0.05-0.10wt%; Si: 0.10-0.25wt%; Mn: 1.2-1.6wt%; P: <0.015wt%; S: <0.008%wt; Al: <0.03wt%; Cr: <0.3wt%; Mo: <0.2wt%; Nb: <0.03wt%; Ti: 0.01-0.02wt%; Ni: <0.8wt%; B: <0.002wt%; Ca: 0.0001-0.003wt%; Zr: 0.0001-0.02wt%, REM: <0.006wt%, N: 0.002-0.006wt%; O: 0.002-0.005wt%; the rest are Fe and inevitable impurities.

[0056] The carbon equivalent of the steel sheet is Ceq=C+Mn / 6+Si / 24+Ni / 40+Cr / 5+Mo / 4+V / 14=0.38%.

[0057] The manufacturing process is smelting→continuous casting→rolling→cooling. The smelting process is: adding Si, Mn, Al in the converter, adjusting the oxygen content of molten steel to reach the refining stage in the range of 10-300ppm, then adding Ti, Cr, Mo, Nb in turn , Ni, Zr, REM, B, Ca and other elements in two or more, and control the interval time of adding each element is 0 ~ 20min. Continuous casting is carried out after reaching the target chemical composition. The continuous casting process is t...

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Abstract

A structural steel for welding with ultra-great heat input and a manufacturing method thereof. The invention belongs to the technical field of high-strength steel plate for welding. The steel plate comprises, by mass percent, the following chemical compositions: 0.03-0.12 wt% of C, 0.01-0.30 wt% of Si, 1.2-2.0 wt% of Mn, not more than 0.015 wt% of P, not more than 0.008 wt% of S, not more than 0.03 wt% of Al, not more than 0.5 wt% of Cr, not more than 0.5 wt% of Mo, not more than 0.03 wt% of Nb, 0.005-0.03 wt% of Ti, 0.01-1.0 wt% of Ni, 0.01-1.0 wt% of Cu, 0.002-0.007 wt% of N, and 0.001-0.006 wt% of O, and also comprises one or more elements selected from Mg, Ca, B, Zr, Ta, or REM with the balance being Fe and unavoidable impurities, and the carbon equivalent of the steel plate is less than 0.40%. The type, size and quantity of the inclusions are controlled by controlling the alloy addition method during the refining phase, and the steel plate for welding with great heat input is manufactured by controlled rolling and controlled cooling process. The advantages are that the steel plate has high strength and good toughness, can endure a welding heat input of 400-1000 kJ / cm, still has excellent low-temperature toughness after welding, and has an average impact energy value of above 70 J at -20 DEG C.

Description

technical field [0001] The invention belongs to the technical field of high-strength structural steel plates for welding, and particularly relates to a structural steel plate for super-large heat input welding and a manufacturing method thereof. Background technique [0002] In order to improve the construction efficiency and reduce the cost, in the construction of large-scale structures, the welding process of steel plates above 40mm has successively adopted super-large heat input welding technologies such as double-wire gas electric vertical welding and electroslag welding, and the welding heat input reaches 400-1000KJ. / cm. A variety of super large heat input welding steel plates have been developed at home and abroad. [0003] The toughness of the welding heat-affected zone is improved by using the TiN mechanism to inhibit the coarsening of CGHAZ grains. For example, the patent application number is 200610047899.8 "A low-alloy high-strength steel plate capable of large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C21C5/28C21C7/06B21B37/74
Inventor 张朋彦朱伏先王国栋
Owner NORTHEASTERN UNIV
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