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Gas-protection welding wire with low alloy and high strength

A gas shielded welding wire, low-alloy high-strength technology, applied in welding medium, welding equipment, metal processing equipment and other directions, can solve the problem of high cost and achieve the effect of low cost, stable wire rod rolling process and good toughness

Inactive Publication Date: 2010-12-08
WUHAN IRON & STEEL (GROUP) CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the Mo metal element has the effect of resisting temper brittleness in the weld, the existing low-alloy high-strength welding wire often contains a certain amount of Mo metal element, and the cost is relatively high

Method used

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  • Gas-protection welding wire with low alloy and high strength

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Embodiment Construction

[0029] Further illustrate the present invention according to specific embodiment below:

[0030] A 50kg intermediate frequency induction furnace is used for smelting, and low S and P scrap steel (P≤0.025%, S≤0.015%) is selected to smelt welding wire steel according to conventional methods. When the C content is lower than 0.05%, deoxidize, Ni, Cu and W are added during charging, Cr is added during refining, and Re is added by ingot hanging in the mold. Smelting uses Si iron and Mn iron for deoxidation, and strictly controls the content of trace elements and gases. The tapping temperature is 1630-1640°C, and it is best to cast into ingots. The contents of the above elements are shown in Table 1. Put the above-mentioned steel ingot into the furnace or into the hot furnace (furnace temperature <1000°C), heat it up to 1180°C and keep it warm for half an hour. The rolling start temperature is ≥1100°C, the final rolling temperature is 900°C, rolled into a billet, and air-cooled af...

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Abstract

The invention provides a gas-protection welding wire with low alloy and high strength, comprising the following chemical components in percentage by weight: 0.06%-0.12% of C, 0.30%-0.60% of Si, 1.40%-2.00% of Mn, not more than 0.025% of P, not more than 0.015% of S, 0.30%-0.70% of Cr, 1.0%-1.6% of Ni, 0.28%-0.5% of W, 0.25%-0.50% of Cu, 0.05%-0.15% of Re and the balance of Fe and inevitable impurities. The welding wire has the advantages of favorable welding state of the obtained welding line and thermal-treated toughness, lower cost than that of the traditional welding wire in the same strength level, higher cost performance and strong practicality.

Description

technical field [0001] The invention relates to a gas-shielded welding wire, in particular to a low-alloy, high-strength gas-shielded welding wire. Background technique [0002] Gas-shielded welding wire has high welding quality, is easy to automate, and is suitable for welding high-strength and high-toughness steels, so it is widely used in the steel industry. For low-alloy high-strength steel welds, in order to ensure the strength of the weld, it is necessary to add a sufficient amount of alloying elements to the welding wire to strengthen the weld. The existing low-alloy high-strength welding wire generally uses more expensive alloying elements such as Mo to strengthen the weld. seam, and some use Cr element. [0003] As the strength of the weld increases, the toughness of the weld tends to decrease. The weld is easy to produce hardened structure and the crack resistance is reduced. In the case that the toughness of high-strength welds is difficult to improve, it is cr...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 黄治军刘吉斌王玉涛缪凯胡家国鲜于小红钟如涛
Owner WUHAN IRON & STEEL (GROUP) CORP
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