High temperature low it is low production manner null of the alloy where cycle fatigue property and tenacity are superior

摘要

PURPOSE:To produce low-alloy heat resistant steel having satisfactory fatigue characteristics at high temp. and low cycle and superior strength at high temp. CONSTITUTION:Steel consisting of 0.03-0.12% C, 0.01-0.15% Si, 0.2-1.6% Mn, 0.15-0.45% Mo, 0.005-0.05% Al, 0.001-0.01% N and the balance essentially Fe is heated to 1,000-1,280 deg.C and finish-rolled at 700-850 deg.C finish rolling termination temp. and 30-75% total draft in the temp. range from the termination temp. +30 deg.C to the termination temp. The rolled steel is tempered at 600-720 deg.C after cooling from a temp. range above the termination temp. -30 deg.C to =300 deg.C at 1-60 deg.C/sec average cooling rate.