Welding wire for 630 MPa grade high Nb steel double submerged arc welding

A technology of submerged arc welding and welding wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems that the strength and toughness of the weld seam are difficult to meet the requirements, and achieve the improvement of insufficient strength and toughness and high weld toughness , excellent economic and social benefits

Active Publication Date: 2018-04-13
武汉钢铁有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] For the traditional TMCP process 630MPa grade steel, the submerged arc welding wire used is mainly Mn-Mo series; from the composition point of view, if the Mn-Mo series welding wire is used for welding X80 steel with high Nb and low alloy content, the weld strength and toughness will be difficult. fulfil requirements
Existing welding materials

Method used

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  • Welding wire for 630 MPa grade high Nb steel double submerged arc welding
  • Welding wire for 630 MPa grade high Nb steel double submerged arc welding
  • Welding wire for 630 MPa grade high Nb steel double submerged arc welding

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Example

[0032] Examples 1 to 5

[0033] The chemical compositions of the welding wires used in the double-pass submerged arc welding of 630MPa grade high Nb steel described in Examples 1 to 5 are shown in Table 1, respectively. The main preparation steps are as follows:

[0034] 1) Use a vacuum smelting furnace for steel smelting, carry out refining in an 1F furnace or an Ar station, so that the chemical composition of the steel meets the composition design requirements, and then continuously cast into a billet, and try to increase the equiaxed crystal ratio of the billet;

[0035] 2) Roll the billet into a wire rod, and pay attention to heating the billet slowly; the obtained wire rod is made into a finished wire through the processes of pickling, cleaning, drying, wire drawing, cleaning, and copper plating, and the diameter of the wire is 4.0mm.

[0036] Table 1 Chemical composition (wt%) of the welding wires obtained in Examples 1-5

[0037]

[0038] Note: Als≤0.02wt%.

[0039] ...

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Abstract

The invention discloses a welding wire for 630 MPa grade high Nb steel double submerged arc welding. The welding wire comprises, by mass, 0.04-0.10% of C, no more than 0.15% of Si, 1.50-2.00% of Mn, no more than 0.018% of P, no more than 0.01% of S, 0.20-0.50% of Ni, 0.30-0.50% of Mo+Cr, 0.02-0.10% of Ti, no more than 0.03% of Nb, no more than 80 ppm of O, no more than 0.02% of Als, and the balance Fe. According to the welding wire for 630 MPa grade high Nb steel double submerged arc welding, a Mn-Ni-Mo-Cr alloy system is adopted and combined with means such as Ti and Nb micro-alloying, weaklyalkaline sintered flux is matched, mechanical properties of deposited metal and strength and toughness of a high Nb steel double submerged arc welding joint can be taken into account simultaneously,and the problems such as poor strength and toughness of an existing high Nb steel double submerged arc welding joint are effectively relieved.

Description

technical field [0001] The invention belongs to the technical field of welding processing of metal materials, and in particular relates to a welding wire for double-pass submerged arc welding of 630MPa high-Nb steel. Background technique [0002] With the continuous improvement of steel rolling process, steel with higher Nb content has been continuously applied in consideration of reducing alloy cost. In the case of reducing the content of more expensive alloys (such as Ni, Mo, Cu) and adding 0.04-0.10% Nb, the recrystallization temperature of austenite can be increased, the rolling temperature can be increased, the cooling rate can be increased, and tempering can be carried out after rolling. Precipitation hardening such as NbC occurs in the steel, and the steel reaches the same strength and higher toughness as traditional steel. With the continuous development of the welding process, in many cases, the double-pass submerged arc welding process that penetrates the root (bl...

Claims

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Application Information

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IPC IPC(8): B23K35/30
CPCB23K35/3066
Inventor 黄治军徐进桥方要治牟文广王辉缪凯郑绍鹏何嘉
Owner 武汉钢铁有限公司
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