Hot rolling wire rod for 60 kg-stage high-strength welding wire and production method thereof

Abstract

The invention discloses a hot rolling wire rod for a 60 kg-stage high-strength welding wire and a production method thereof. The hot rolling wire rod comprises the following chemical components including, by mass, 0.06% to 0.12% of C, 0.40% to 0.80% of Si, 1.50% to 2.00% of Mn, 0.020% or less of P, 0.020% or less of S, 0.040% to 0.060% of V, 0.050% to 0.090% of Ti, 0.20% to 0.45% of Cr and the balance Fe and unavoidable impurities. The production method comprises steel making, continuous casting, heating, rolling, spinning and cooling procedures. According to the hot rolling wire rod for the 60 kg-stage high-strength welding wire and the production method thereof, the hot rolling wire rod for high-strength welding is produced through vanadium and titanium alloying, microstructures of equiaxial ferrite and pearlite are obtainedin cooperation with control over the finish rolling temperature, spinning temperature, cooling temperature and winding temperature, the hot rolling wire rod is processed into a gas shielded welding rod, the deposited metal tensile strength is 600 MPa to 700 MPa, and the wire rod is low in cost and good in performance stability.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a hot-rolled wire rod for a 60 kg-class high-strength welding wire and a production method thereof. Background technique [0002] my country is the world's largest producer of welding materials and the country that uses the largest amount of welding materials. With the increasing strength of steel materials used in various manufacturing industries such as pressure vessels, automobiles, and construction machinery, higher requirements have been placed on the strength of the deposited metal in welding, and the matching 60 kg The demand for high-quality welding wire of grade and above has greatly increased, and non-alloy steel wire rod and even low-alloy steel wire rod can no longer fully meet the demand. [0003] Welding wire (application patent number: 89105436.7) and a gas shielded welding wire (application patent number: 95108258.2). The welding wire uses expensive Ni and...

AI Technical Summary

Problems solved by technology

As the steel materials used in various manufacturing industries such as pressure vessels, automobiles, and construction machinery tend to be more and more high-strength, higher requirements are placed on the strength of the deposited metal in welding, and the matching 60 kg The demand for high-quality welding wire at and above grades has increased significantly, and non-alloy steel wire rods and even low-alloy steel wire rods can no longer fully meet the demand

[0003] Welding wire (patent application number: 89105436.7) and a gas shielded welding wire (patent application number: 95108258.2) said welding wire uses expensive Ni and Mo elements; micro-titanium boron high toughness gas shielded welding wire (patent application number: 01128326.2) High-toughness gas shielded welding wire for low-alloy high-strength steel (patent application number: 01133651.X) does not contain Mo element and uses B element. Although B element can improve the strength of deposited metal, it is easy to form BN and the absorption rate is unstable. phenomenon, resulting in an increase in smelting costs

The alloy steel wire rod for welding specified in GB / T 3429, and the 60 kg grade welding wire specified in GB / T 8110 are all made of Mn, Si, Ni, Mo, V, Ti, B, Zr, Al, rare earth, etc. The production process of complex alloying of multiple elements, due to the addition of many types of alloys, on the one hand, it causes complicated steelmaking and rolling process, and has high requirements for rolling equipment, which leads to an increase in process costs. On the other hand, multi-element alloying causes performance fluctuations Large, affecting the stability of product quality

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