The yield strength, tensile ratio and toughness are major quality indexes of steel pipe ( board ).

屈服强度 、 屈强比、韧性等是钢管 ( 板 ) 的主要质量指标,合理确定这些指标的数值有相当难度.

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But the tensile strength will be reduced a little, and the yield ratio increased.

但抗拉强度将随卷曲温度的降低而有少量损失, 而屈强比提高.

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