Alloy structural steel for welding wire, wire rod and manufacturing method thereof

Abstract

Alloy structural steel for welding wire, among which: C: 0.08~0.13; Mn: 1.20~1.70; Si: 0.65~0.90; Cr: ≤0.10; Al: ≤0.015; Mo: ≤0.10; 0.02; S: ≤0.008; Cu: ≤0.10; P: ≤0.012; B: ≤0.005; Ti: ≤0.020; N: 0.0040~0.0150; O: ≤0.0015; ≤0.015; Ca: ≤0.0004; the balance is Fe and unavoidable impurities. The manufacturing method includes: a. electric arc furnace smelting, tapping conditions: [C]≥0.04%; [P]≤0.006%; tapping temperature: 1620-1660°C; b. Deoxidation of powder and C powder slag surface; c. pouring; d. rolling, soaking temperature 1070-1200°C, holding time 100-160min, furnace temperature 1050-1180°C, inlet temperature 780-850°C; e. cooling, on-line Slow cooling, cooling rate 40 ~ 80 ℃ / h. The structural steel has high purity, good drawing performance and toughness.

Description

technical field [0001] The invention relates to the field of structural steel, in particular to a composition design and a manufacturing method of an alloy structural steel for welding wire. In addition, the present invention also relates to a welding wire made of the alloy structural steel for welding wire. Background technique [0002] Welding wire is a wire welding material used as a filler metal during welding or as a conductive wire at the same time. In gas welding and gas tungsten arc welding, the wire is used as the filler metal; in submerged arc welding, electroslag welding, and other gas-tungsten arc welding, the wire is both the filler metal and the conductive electrode. Welding wire can be divided into 3 categories: the first is rolling welding wire, including carbon steel welding wire, low alloy structural steel welding wire, alloy structural steel welding wire, stainless steel welding wire and non-ferrous metal welding wire, etc.; the second is casting welding ...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application CN94101322.7 discloses a carbon dioxide gas shielded welding ultra-fine welding wire, which contains lower Mn and Si, so it has excellent toughness and is suitable for drawing, but the strength is difficult to meet the technical requirements; Chinese patent applications CN01128326.2, CN01133651 .X, CN02119591.9, CN00114334.4, and CN01106520.6 relate to alloy steel welding wires added with trace alloy elements such as titanium and boron. The technical purpose of adding Ti is to ensure that the Ti content in the weld can achieve the best promotion and fineness The technical effect of acicular ferrite, the technical purpose of adding B is to inhibit the transformation of proeutectoid ferrite, reduce the transformation temperature, refine the structure and solid solution strengthening to improve the strength; CN00110787.9 belongs to the pure steel series, its S, P, Sn, As and other residual elements are limited, but their strength and toughness are poor; Cu is added to CN0410025569.X, and its technical purpose is to improve corrosion resistance

[0005] (1) poor toughness;

[0006] (2) Microalloying such as Ti and B is used to improve strength and toughness, but the actual welding performance is poor;

[0007] (3) Most patents do not limit the harmful residual elements, and the purity is poor

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