High alloy hot rolling piercing plug

Abstract

The invention provides a high alloy hot rolling piercing plug. The plug is prepared from, by mass, 0.10-0.40% of C, 0.15-1.00% of Si, 0.10-0.50% of Mn, 0-0.030% of P, 0-0.015% of S, 0.50-1.00% of Ni, 0.50-1.50% of Cr, 2.00-6.00% of Mo, 7.50-15.00% of W, 0-0.10% of Cu, 0-0.10% of Nb, 0.20-0.50% of V, 0.005-0.025% of Ti, 0.02-0.20% of Al, 0-100 ppm of residual element N, 0-80 ppm of residual element O, 0-80 ppm of residual element As, 0-80 ppm of residual element S, 0-50 ppm of residual element Pb and the balance Fe. The plug has the advantages that the plug is free of melting, cracking and dead burning during high temperature rolling, piercing and rolling effects are good, rolling defects are avoided, the surface quality and yield of steel pipe products are improved, and meanwhile the service life of pierced holes is prolonged by 5 times or above.

Description

technical field [0001] The invention relates to a seamless stainless steel pipe hot-rolled piercing tool, which is a high-alloy hot-rolled piercing plug. Background technique [0002] With the rapid increase in the production of seamless stainless steel pipes, due to the high thermal deformation resistance of stainless steel materials and the relatively sticky material, the traditional round billet hot rolling technology and process are used in the piercing and rolling of large quantities of stainless steel pipes. Rolling tools such as The steel sticking phenomenon of piercing plugs and guide plates causes a sudden increase in tool consumption, and also causes various defects in the quality of the inner and outer surfaces of the rolled stainless steel pipes, such as tools sticking to steel, so that the cost of rolling stainless steel remains high, and the rolling yield , The production efficiency is low, which has a great impact on the large-scale production of enterprises. ...

AI Technical Summary

Problems solved by technology

Ordinary plug piercing is used, and the service life is generally 3 to 5 piercing and rolling. Frequent tool replacement will seriously affect the normal production order, and also cause defects on the product surface, and the yield is low.

The use of molybdenum-based alloy plugs, due to the existing production process and production line, cannot meet the requirements of molybdenum-based plugs with a preheating temperature of ≥800°C and cannot be splashed by water. The price is high, and it is difficult to popularize and use

[0005] At present, plugs are mainly made of carbon steel pipe piercing materials, and high-alloy molybdenum-based plugs, which do not meet the requirements of existing production lines and products.

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