Steel for economical MPM continuous-rolled core rod and manufacturing method thereof

Abstract

The invention discloses steel for an economical MPM continuous-rolled core rod. The steel comprises, by weight, 0.35%-0.45% of C, 0.8%-1.2% of Si, 0.8%-1% of Mn, 4.8%-5.5% of Cr, 0.3%-0.5% of Mo, 0.1%-0.2% of Ti, 0.02%-0.08% of Nb, 0.002-0.004% of B, 0-0.03% of P, 0-0.02% of S, and the balance Fe and impurities. A manufacturing method of the steel comprises the steps that an electrode rod is smelted; the electrode rod is subjected to electroslag remelting to obtain an electroslag ingot; and the electroslag ingot is heated and forged into a forged blank. According to the steel for the economical MPM continuous-rolled core rod and the manufacturing method thereof, the chemical component proportion of the steel is more economical and cheaper, the Mo content and the V content are decreased, and the alloy cost is greatly reduced; and meanwhile, the mechanical properties of the novel steel are reinforced and ensured by increasing the content of the element Mn and the content of the element Si and adding the microalloy elements of the Ti, the Nb and the B.

Description

technical field [0001] The invention belongs to the field of alloy steel, and mainly relates to a steel material used for an economical MPM continuous rolling mandrel and a manufacturing method thereof. Background technique [0002] The mandrel is one of the important tools in the rolling deformation process of the seamless steel pipe, and it is also one of the main consumable spare parts in the production process. According to the different rolling methods of steel pipes, it can be divided into floating mandrel, semi-limited mandrel and limited mandrel, and the proportion of limited mandrel is the largest. [0003] Due to the strong technicality and difficulty in manufacturing the limited motion mandrel, domestic enterprises producing large-diameter seamless steel pipes have mainly imported mandrels from abroad for many years. For example, in 2007, the import volume of mandrels in my country was about 9,000 tons. At present, the production of mandrels in the world is only ...

AI Technical Summary

Problems solved by technology

At present, the production of mandrels in the world is only in the hands of a few companies, which are in a monopoly position. Not only is the price much higher than that of other similar products of H13 steel, but also its long manufacturing cycle and large inventory cost are easily affected by the international market.

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