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Ⅱ、ⅡS和36r。C钢管坯,即使化学成份在OCT1421—77标准范围内,钢的强度和塑性值指标仍然很分散。研究指出,采用微合金化和化学成份最佳化的方法可使之稳定,性能分散程度可减少1/2～3/4,钢管一级品增加,废品和修整费用降低。 试验用钢的含碳量,凰B钢取0.41～0.48％,36r,C钢取0.32～0.40％。试验得出,只B钢机械性能与化学成份关系的回归方程是:
Ⅱ, Ⅱ S and 36r. C steel billet, even though the chemical composition of the OCT1421-77 standard range, the strength and plasticity of steel is still very scattered indicators. Research shows that the use of micro-alloying and chemical composition optimization method can make it stable, the degree of dispersion can be reduced by 1/2 ~ 3/4, a steel pipe increased waste and trim costs reduced. The carbon content of the test steel, Huang B steel take 0.41 to 0.48%, 36r, C 0.32 to 0.40% steel. The test shows that only the relationship between the mechanical properties of B steel and the chemical composition of the regression equation is: