A welding wire suitable for submerged arc welding of low-grade pipeline steel below l360/x52

A technology of submerged arc welding and pipeline steel, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of deterioration of steel pipe performance, weld strength, high hardness, increase in steel pipe welding cost, etc., to improve weldability, The effect of reducing welding production cost and reducing welding wire cost input

Active Publication Date: 2019-07-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the welding process of such steel pipes, H08MnMoA welding wire with high alloy content is mostly used, which not only increases the welding cost of steel pipes, but also increases the strength and hardness of weld seams, which seriously deteriorates the performance of steel pipes.

Method used

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  • A welding wire suitable for submerged arc welding of low-grade pipeline steel below l360/x52
  • A welding wire suitable for submerged arc welding of low-grade pipeline steel below l360/x52

Examples

Experimental program
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example 1

[0023] Example 1: Using a vacuum induction furnace, it is necessary to use raw materials with low P, S, and C impurities, and strictly control the S, P content of molten iron. After deoxidation and alloying, the molten steel that meets the composition requirements is smelted and cast into continuous casting. billet, rolled by high-speed twist-free rolling mill Wire rod, The wire rod is made by shelling and derusting-electrolytic pickling-boration treatment-drawing-degreasing-electrolytic alkaline cleaning-electrolytic pickling-electroless copper plating and Finished welding wire. The mass percent content of the welding wire is: C 0.06, Mn 1.05, Si 0.23, P 0.007, S 0.008, Cr 0.26, Cu 0.15; Ti 0.025; the rest is Fe.

[0024] The welding wire of the present invention is matched with SJ301G flux to carry out deposited metal welding. According to the standard requirements of "GB / T12470-2003 Low-alloy Steel Welding Wire and Flux for Submerged Arc Welding", the test plate adop...

example 2

[0028] Example 2: The welding wire produced by the above process, the mass percentage of the welding wire is: C 0.06, Mn 1.05, Si0.23, P 0.007, S 0.008, Cr 0.26, Cu 0.15; Ti 0.025; the rest is Fe.

[0029] The welding wire of the present invention is matched with BG-SJ301G flux to weld Q235B pipeline steel with a thickness of 12.5mm. The composition of Q235B pipeline steel is C 0.15, Si 0.22, Mn 0.22, P 0.014, S 0.01, Cu 0.06, Ni 0.04, Cr0 .02, Al 0.01, B 0.0004, and the rest are iron. The process method is X-type joint form, the inner groove angle is 30°, the outer groove angle is 45°, and the size of the blunt edge is 5-6mm. The welding specification is: internal welding welding current 550-780A, welding voltage 29.5-32V; external welding welding current 1100-1250A, welding voltage 31-33V, welding speed 1.62-1.98m / min, internal and external double-wire submerged arc welding, after welding The weld shape is good, and the transition at the weld toe is good. The mechanical pro...

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Abstract

The invention discloses a welding wire suitable for submerged-arc welding of low-grade pipeline steel of L360 / X52 or below. The welding wire is prepared from, by mass percent, 0.05<=C<=0.10, 0.5<=Mn<=1.8, 0.10<=Si<=0.30, P<=0.015, S<=0.01, 0.20<=Cr<=0.30, 0.10<=Cu<=0.25, 0.01<=Ti<=0.03 and the balance Fe. After the welding wire is matched with SJ301 welding flux to carry out inner face and outer face submerged-arc welding on the low-grade pipeline steel of L360 / X52 or below, the tensile strength of a welding line is larger than 460 MPa, and the impact toughness of a welding joint at the temperature being -10 DEG C is larger than 100 J.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of submerged arc welding wire, and in particular relates to a welding wire suitable for submerged arc welding of low-grade pipeline steel below L360 / X52. [0003] Background technique: [0004] In recent years, with the continuous growth of my country's urban oil, natural gas, hydropower, thermal resources demand and infrastructure such as cities, roads, and transportation, steel pipes are mainly used for urban oil and gas gathering and transportation pipeline networks, water delivery, heating, etc. Municipal pipelines, the steel pipes used in this kind of municipal pipelines generally have the characteristics of small pressure bearing and large transmission capacity. Therefore, the steel grade requirements for steel pipes are relatively low, and the performance and quality requirements for steel pipes are relatively loose. Roads, buildings, etc. mainly play the role of connection, support, and surround...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K9/18
CPCB23K9/18B23K35/3073
Inventor 毕宗岳赵红波牛辉刘海璋刘斌陈长青付宏强杨军席敏敏牛爱军赵勇张鹏黄晓辉包志刚刘刚伟田磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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