Special niobium and vanadium containing chilled cast iron roll for splitting rack and production technology

Abstract

The invention relates to a chilled cast iron roll manufacturing method, in particular to a manufacturing method for a special niobium and vanadium containing chilled cast iron roll for a splitting rack. An outer layer and a core part of the roll are prepared through double chemical components. The outer layer components comprise 2.9%-3.2% of C, 0.25%-0.60% of Si, 0.2%-0.5% of Mn, smaller than or equal to 0.05% of P, smaller than or equal to 0.03% of S, 0.5%-0.8% of Cr, 3.5%-4.0% of Ni, 0.3%-0.6% of Mo, 0.1%-0.3% of V, 0.1%-0.3% of Nb and the balance Fe. The core part components comprise 3.2%-3.5% of C, 2.2%-2.4% of Si, 0.3%-0.5% of Mn, smaller than or equal to 0.05% of P, smaller than or equal to 0.03% of S, 0.15% of Cr, smaller than or equal to 0.04 of Mg and the balance Fe. When molten iron is smelted, 1-3 kg of yttrium-based heavy rare earth modificator is added for each ton; the chemical property of rare earth elements is active, and stable compounds can be formed by the rare earthelements and S, O, H and N in molten steel; the affinity of the yttrium and S is high, after the rare earth modificator is added, the S content in the steel can be further reduced, and hot shortnessof the roll is prevented; and the yttrium-based heavy rare earth modificator can also refine grains and improve the tensile strength and impact toughness.

Description

technical field [0001] The invention relates to a roll and a production process, in particular to a chilled cast iron roll and a production process for a split frame containing niobium and vanadium. Background technique [0002] Segmented rolling is to use the function of the pass shape to roll a rolled piece into two or more parallel rolled pieces with the same shape during the rolling process. ~Φ12mm) output, the split rolling process has been widely used, that is, the rolled flat square steel piece is pre-cut in the pre-slitting frame and the slitting frame at the same time through the processing of the roll hole tip of the arc-shaped knife tip. Cut and cut into 2-4 steel bars with the same specifications, and then guide them into the finished pass and roll them into steel bars that meet the size requirements. [0003] The running speed of the whole pre-slitting and slitting rolling is fast, and the cutting ability and wear performance of the slitting knife tip have to w...

AI Technical Summary

Problems solved by technology

Once there is an abnormality at the tip of the knife, quality problems such as folds and burrs will often occur in the rolling pass of the finished product, resulting in batches of defective products

Now many manufacturers use bainite ductile iron and high-speed steel rolls for splitting racks. Their respective characteristics are: bainite balls have poor wear resistance, and the holes need to be changed for a pass of 500 tons. High-speed steel rolls have a pass Cutting between 1500 and 2000 tons, using a lot of precious alloys, high price, difficult to turn

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