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High ductility buried arc welding wire for low-alloy super-strength steel

A technology of ultra-high-strength steel and submerged arc welding wire, which is applied in arc welding equipment, welding medium, welding equipment and other directions to achieve the effect of suitable alloy system, low cost and easy drawing process

Inactive Publication Date: 2007-02-28
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

WISCO Technology Center developed WCF-80 steel submerged arc welding wire in 1990. The strength of the deposited metal of the welding wire is greater than 800MPa, but the impact toughness at -20°C can only reach 50J

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The welding wire steel of the present invention is smelted in an electric furnace, and the welding wire steel is drawn into a welding wire with a specification of φ4mm after smelting, and the finished welding wire is formed after the surface is copper-plated. Its chemical composition is calculated by weight percentage: C 0.065, Si 0.10, Mn 1.75, Cr 0.52, Ni 2.39, Mo 0.36, Cu 0.14, Ti 0.089, B 0.0063, P0.009, S0.0036, and the balance is Fe.

[0038] The welding wire is welded with CHF105 flux, the welding current is ~500A, the arc voltage is ~30V, the welding speed is ~36cm / min, and the welding line energy is ~25KJ / cm. The mechanical properties of the deposited metal are R el =620MPa,R m =825MPa, A=20%, Z=65%, impact energy A KV (-20°C) = 108J,A KV (-40°C) = 77J,A KV (-50°C) = 48J.

Embodiment 2

[0040] The composition of this welding wire is with embodiment 1. Used in conjunction with CHF105 flux to weld low-alloy high-strength steel HG785. The thickness of the test plate is 30mm, and the X-shaped bevel with an opening angle of 70°. The welding line energy is 34KJ / cm, and the specific specifications are: welding current ~ 630A, arc voltage ~ 31V, welding speed ~ 36cm / min. The tensile strength of the joint reaches 850MPa, and the cold bending performance is qualified. Weld metal series temperature impact energy A KV (-20°C) = 111J,A KV (-40°C) = 109J.

Embodiment 3

[0042] The making of this welding wire is the same as embodiment 1. Its chemical composition is calculated by weight percentage: C 0.10, Si 0.15, Mn 1.9, Cr 0.53, Ni 1.44, Mo 0.17, Cu 0.42, Ti 0.20, B 0.008, P0.009, S0.0034, and the balance is Fe.

[0043] This welding wire is used in conjunction with CHF101 flux, and the welding specifications are the same as in Example 1. The mechanical properties of the deposited metal are R el =625MPa, R m =840MPa, A=18%, Z=63%, impact energy A KV (-20°C) = 77J,A KV (-40°C) = 50J.

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Abstract

The invention discloses a low-alloy super-strength steel high-flexible buried arc solder wire, which comprises the following parts: 0.06-0.12% C, 0.03-0.20% Si, 1.50-2.00% Mn, 0.20-0.60% Cr, 1.40-2.60% Ni, 0.10-0.50% Mo, 0.10-0.60% Cu, 0.06-0.20% Ti, 0.002-0.010% B and Fe and impurity. The solder wire mates the alkaline sintered welding agent with tensile strength of welding seam not less than 800Mpa, which possesses impacting flexibility AKV not less than 47J at -40 deg.c.

Description

technical field [0001] The invention relates to a high-toughness submerged arc welding wire for low-alloy ultra-high-strength steel, matched with alkaline sintering flux, the tensile strength of the weld metal is ≥800MPa, and the impact toughness at -40°C is A KV ≥47J, wide range of adaptability to line energy. Background technique [0002] In recent years, WISCO has successively developed high-strength steel plates such as DB685, HG785, and WCF-80. These steel types have filled the blank of ultra-high-strength low-alloy steel in my country and met domestic needs. But at the same time, due to the lack of corresponding welding materials in the market, the promotion and application of steel types is limited, especially the submerged arc welding materials, which are not yet matched, and there is a big gap with the development level of foreign countries. Welding these high-strength steel grades with submerged arc welding wires currently on the domestic market often leads to low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/18
Inventor 刘吉斌缪凯胡因洪王玉涛黄治军曹修悌张小枫余酒泉胡家国牟文广陈浮
Owner 武钢集团有限公司
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