High-manganese ultralow temperature steel welding wire and welding process thereof

A welding process and ultra-low temperature technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of high welding material cost, achieve the effect of reducing Ni content, reducing cost and expense, and good toughness

Active Publication Date: 2017-09-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the cost of existing ultra-low temperature steel welding consumables is high. In view of the above shortcomings in the prior art, a welding wire and its welding process suitable for high manganese ultra-low temperature steel are proposed

Method used

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  • High-manganese ultralow temperature steel welding wire and welding process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high manganese ultra-low temperature steel welding wire, its chemical composition and mass percentage content are as follows: C is 0.33%, Mn is 24.4%, Si is 0.05%, S is 0.002%, P is 0.013%, Ni is 1.6%, Cr is 3.1% %, Cu is 0.2%, N is 0.035%, and the balance is Fe and the residual elements usually present in steelmaking.

[0023] Use this welding wire to weld high-manganese ultra-low temperature steel, adopt tungsten argon arc welding, the groove type is "V", the heat input is 4KJ, and the shielding gas is high-purity argon.

[0024] as attached figure 1 Shown is a photograph of the metallographic structure of the weld metal, the microstructure type is austenitic. Measured specified non-proportional elongation strength R of the weld metal p0.2 =551MPa, tensile strength R m =813MPa, elongation A=44%, impact test impact absorption energy KV at -196°C 2 =50J.

Embodiment 2

[0026] A high manganese ultra-low temperature steel welding wire, its chemical composition and mass percentage content are as follows: C is 0.2%, Mn is 27.0%, Si is 0.15%, S is 0.001%, P is 0.02%, Ni is 1.0%, Cr is 4.5% %, Cu is 0.33%, N is 0.06%, and the balance is Fe and the residual elements usually present in steelmaking.

[0027] Use this welding wire to weld high-manganese ultra-low temperature steel, adopt tungsten argon arc welding, the groove type is "V", the heat input is 15KJ, and the shielding gas is high-purity argon.

[0028] The microstructure type of the weld metal is austenitic, and the specified non-proportional elongation strength R p0.2 =420MPa, tensile strength R m =680MPa, elongation A=51%, impact test impact absorption energy KV at -196°C 2 =92J.

Embodiment 3

[0030] A high manganese ultra-low temperature steel welding wire, its chemical composition and mass percentage content are as follows: C is 0.4%, Mn is 18.0%, Si is 0.07%, S is 0.001%, P is 0.007%, Ni is 3.0%, Cr is 2.0% %, Cu is 0.5%, N is 0.01%, and the balance is Fe and the residual elements usually present in steelmaking.

[0031] Use this welding wire to weld high-manganese ultra-low temperature steel, adopt argon tungsten arc welding, the groove type is "V", the heat input is 21KJ, and the shielding gas is high-purity argon.

[0032] The microstructure type of the weld metal is austenitic, and the specified non-proportional elongation strength R p0.2 =486MPa, tensile strength R m =741MPa, elongation A=40%, impact test impact absorption energy KV at -196°C 2 =64J.

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Abstract

The invention discloses a high-manganese ultralow temperature steel welding wire. The high-manganese ultralow temperature steel welding wire comprises the chemical components, by mass, of 0.2%-0.4% of C, 18.0%-27.0% of Mn, less than or equal to 0.15% of Si, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 1.0%-3.0% of Ni, 2.0%-4.5% of Cr, 0.2%-0.5% of Cu, 0.01%-0.06% of N and the balance Fe and residual elements commonly existing in steelmaking. A welding process of the high-manganese ultralow temperature steel welding wire adopts tungsten pole argon arc welding, the groove is in a V shape, the heat input amount is 4-21KJ, and protective gas adopts high-purity argon. The high-manganese ultralow temperature steel welding wire is made of an alloy with the high Mn content, the Ni content is decreased by a large margin, and accordingly the material cost is reduced significantly. According to the welding process, preheating before welding and heat treatment after welding are not needed, the process is simple and easy to implement. The strength, plasticity and toughness of the formed weld metal are well matched, and the formed weld metal has good toughness especially in the ultralow temperature environment of -196 DEG C.

Description

technical field [0001] The invention belongs to the technical field of low-temperature steel welding materials and welding processes, and in particular relates to a high-manganese ultra-low-temperature steel welding wire and its welding process. Background technique [0002] As a clean and efficient energy source, liquefied natural gas (LNG) has received more and more attention in its industrial development. The LNG ship is a special ship used to transport LNG. Since LNG is natural gas cooled to -163°C liquid state, the LNG ship must keep it at -163°C during transportation. Therefore, the working environment of the LNG ship requires the manufacture of LNG The material of the boat has excellent low temperature properties. 9% Ni steel has excellent toughness and high strength at extremely low temperature, and compared with austenitic stainless steel and aluminum alloy, it has low thermal expansion coefficient, good economy, and the lowest service temperature can reach -196 °C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/3073
Inventor 孙超李丽田浩单以刚李强
Owner NANJING IRON & STEEL CO LTD
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