Patent ID: 9120136
Filing Date: 2015-09-01
Classification: B21C,C10M,C10N,C22C,C22F

Abstract:
1. A drawing method of a metallic tube which includes: filling a high-pressure container with a lubricating oil, the container having a mother tube inserted thereinto; thereafter increasing the pressure of the lubricating oil by means of a pressure booster; and drawing the mother tube, with inner and outer surfaces thereof forcedly lubricated, wherein the lubricating oil to be used has a kinetic viscosity in the range of 100 to 2000 mm wherein a chemical composition of the mother tube consists of, by mass %, C: not more than 0.15%, Si: not more than 1.00%, Mn: not more than 2.0%, P: not more than 0.030%, S: not more than 0.030%, Cr: 10.0 to 40.0%, Ni: 8.0 to 80.0%, Ti: not more than 0.5%, Cu: not more than 0.6%, Al: not more than 0.5% and N: not more than 0.20%, the balance being Fe and impurities.