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本文对钢管断面收缩率进行了测量,发现有三种情况: (1)断口面呈圆形,并与原截面平行,可用公式ψ=F_0-F_1/F_0×100%米求其断面收缩率。 (2)断口面呈椭圆形,并与原截面平行,断面收缩率ψ与断口椭圆长短轴之差成线性关系,为负相关,应求出其影响值,对理论值进行修正。 (3)断口面呈斜向或曲面状,应作剖条试验测其断面收缩率。只有在均匀退火的情况下,才能反映整支管材性能。
In this paper, the reduction of the section of steel pipe was measured and found that there are three cases: (1) The fracture surface is circular and parallel with the original cross-section, available formula ψ = F_0-F_1 / F_0 × 100% (2) The fracture surface is elliptical and parallel to the original cross-section. The cross-sectional shrinkage ψ is linearly related to the difference between the long and short axes of the fracture oval, and is negatively correlated. The theoretical value should be corrected. (3) fracture surface was oblique or curved shape, should be sectioned test section measured the rate of contraction. Only in the case of uniform annealing, to reflect the entire pipe performance.