晶粒大小对0Cr18Ni10Ti不锈钢管力学性能的影响

Effect of Crystal Grain Size on Tensile Properties of 0Cr18Ni10Ti Stainless Steel Tubes

研究了晶粒大小对0Cr18Ni10Ti不锈钢管室温和高温(320℃)拉伸性能的影响。结果表明:在相同程度的冷变形加工下,当不锈钢管晶粒度由12.0降低为7.5级时,随着晶粒尺寸增加,钢管的室温抗拉强度由760 MPa降低为614 MPa,屈服强度由525 MPa降低为456 MPa,而伸长率由31%增加为40.5%。高温抗拉强度和屈服强度分别由565和490 MP降低为477和400 MP,其伸长率由6.5%增加为18%。因此,为提高不锈钢管综合力学性能应对其晶粒尺寸进行合理控制。

The effect of crystal grain size on the tensile properties of 0Crl8Nil0Ti steel tubes was investigated at room temperature and 320 ℃. The results show that, when the grain size decreases from 12.0 to 7.5, the ultimate tensile strength and yield strength at room temperature decreases from 760 and 525 MPa to 614 and 456 MPa, respectively, while the elongation increases fi＇om 31.0% to 40.5%; the ultimate tensile strength and yield strength at 320 ℃ decrease from 565 and 490 MPa to 477 and 400 MPa, respectively, the elongation increases from 6.5% to 18.0%. Therefore, the grain size should be reasonably control to improve the mechanical properties of the stainless steel tubes.