Abstract: R4 circular cross-section and full thickness specimen tensile tests of 10CrNi3MoV steel with thickness of 16mm, 24mm and 35mm were carried out.Results indicate that yield strength and tensile strength remain the same between full thickness specimen and R4 specimen, showing no obvious variation with width-thickness ratio. Ductility of full thickness specimen decreases with increasing width-thickness ratio, showing lower values than that of R4 specimen.