GH3625 alloy with carbon content of 0. 031%

0. 048% and 0. 055% is forged from 4>480 mm ingot to 0155 mm bar and rolled into 090 mm bar and heating at 1 000 °C for 1 h

air cooling. Tlie 0.023% C alloy is forged from Φ480 mm to Φ180 mm

Φ155mm and Φ 135 mm respectively

and the Φ155 mm forging stock is rolled to Φ90 mm and Φ80 mm bar respectively by the 450 horizontal rolling mill. The following solid solution treatment is heated at 950 °C for 1 h

air cooling. The test results show that with increasing the C content from 0. 031% to 0. 055% the yield and tensile strength of GH3625 alloy increase respectively from 419 and 862 MPa to 597 and 938 MPa. But the elongation and reduction of section of alloy have little change. With the increase of deformation from 85. 9% to 97. 2%

the grain size rating of 0.023% C GH3625 alloy changes from 4 to 6

and the mechanical properties are improved.