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Special welding wire for martensitic stainless steel welding in continuous rolling unit

A technology of martensitic stainless steel and rolling unit, which is applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc. It can solve the problem of insufficient toughness of martensitic stainless steel welds, failure to meet rolling requirements, and limited martensitic To solve the production efficiency of bulk stainless steel, achieve the effects of excellent weld toughness, coordinated stress distribution, and good matching

Active Publication Date: 2017-09-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structural feature makes the toughness of martensitic stainless steel welds seriously insufficient, unable to meet the rolling requirements, and severely limits the production efficiency of martensitic stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The welding wire used in this embodiment is the existing conventional ER316L austenitic stainless steel welding wire.

[0027] The material to be welded is 2Cr13 martensitic stainless steel plate with a thickness of 4.0mm, and the material composition is: C0.19.wt.%; Cr13.29.wt.%; Si 0.55.wt.%; Mn 0.35.wt.%; Fe 85.62.wt.%.

[0028] The welding process used is laser-arc hybrid welding. Welding process parameters are: laser power 4.0kW, arc current 86A, arc voltage 18.0V, laser focal length 215mm, defocus -2mm, welding speed 2.5m / min, distance between light wires 3mm, dry wire elongation 11.0mm, welding torch inclination is 50 degrees. The welding process is stable, and high-quality welds without cracks and pores can be obtained, but the residual austenite content of the welds is small, and fractures occur along the welds in the cupping test. There are obvious penetrating cracks in the seam.

Embodiment 2

[0030] The welding wire composition used in this embodiment is: Ni 73wt.%; Cr 22wt.%; Mn 3.5wt.%; Fe1.3wt.%; Si 0.15wt.%; C 0.05wt.%.

[0031] The material to be welded is consistent with Example 1.

[0032] The welding process used is laser-arc hybrid welding. Welding process parameters are: laser power 4.0kW, arc current 86A, arc voltage 18.0V, laser focal length 215mm, defocus -2mm, welding speed 2.5m / min, distance between light wires 3mm, dry wire elongation 11.0mm, welding torch inclination is 50 degrees. The welding process is stable, and high-quality welds without defects such as cracks and pores can be obtained, and an austenite structure with sufficient toughness can be formed inside the weld to make it fracture perpendicular to the weld in the cupping test (fracture along the base metal ), and by rolling with a reduction of 60wt.%.

Embodiment 3

[0034] The welding wire composition used in this embodiment is: Ni 60wt.%; Cr 30wt.%; Mn 5wt.%; Fe4.8wt.%; Si 0.15wt.%; C 0.05wt.%.

[0035] The material to be welded is consistent with Example 1.

[0036]The welding process used is fiber laser welding. The process parameters are laser power 5.0kW, laser focal length 215mm, defocus amount -2mm (laser focus is below the sample surface), welding speed 2.5m / min, and wire spacing (the distance between the laser spot and the tip of the welding wire on the sample surface) -2mm, the wire feed angle is 30 degrees. The welding process is stable, and high-quality welds without defects such as cracks and pores can be obtained, and an austenite structure with sufficient toughness can be formed inside the weld to make it fracture perpendicular to the weld in the cupping test (fracture along the base metal ), and by rolling with a reduction of 50wt.%.

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Abstract

The invention discloses a special welding wire for martensitic stainless steel welding in a continuous rolling unit. The welding wire comprises the following components by weight percent: 60 wt.% to 90 wt.% of Ni, 8 wt.% to 30 wt.% of Cr, 1 wt.% to 5 wt.% of Mn, 0 wt.% to 5 wt.% of Fe, 0 wt.% to 0.5 wt.% of Si and 0 wt.% to 0.1 wt.% of C. According to the special welding wire, through reasonable design of the components of the welding wire, distribution of Ni, Cr and Mn elements in a welding molten pool is controlled, formation of austenite in a welding metal is promoted, growing of martensite is inhibited, martensite large-angle orientation difference ratio is increased, toughness of weld joints is finally improved, and the rolling requirement is met; and continuous rolling of martensitic stainless steel can be achieved, production cost of martensitic stainless steel is reduced, and the special welding wire has important meaning for development promotion of the continuous rolling industry of martensitic stainless steel.

Description

technical field [0001] The invention belongs to the field of welding wire for continuous rolling, and more specifically relates to a special welding wire for welding martensitic stainless steel in a continuous rolling unit. Background technique [0002] Compared with traditional rolling, continuous rolling improves the working efficiency, reduces the impact of the rolled piece on the rolling mill, reduces the accidents of process equipment and the consumption of spare parts, and improves the dimensional accuracy of the rolled piece, so it is widely used in strip steel in production. However, the welds between the rolling plates must maintain sufficient strength and toughness during continuous rolling, otherwise it is easy to cause rolling breakage, affect production efficiency and yield, and bring huge economic losses. [0003] Martensitic stainless steel has moderate corrosion resistance and low price, and is widely used in nuclear industry, medical equipment, chemical mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/304
Inventor 高明郝康达曾晓雁
Owner HUAZHONG UNIV OF SCI & TECH
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