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when no material standard exists for the metal in question, or when non-metallic materials are used the values of yield strength or proof strength shall be approved by the competent authority.
如某种金属没有材料标准或在使用非金属材料时,所用屈服强度或弹限强度值应经主管当局核准。
when austenitic steels are used, the specified minimum values of yield strength and proof strength according to the material standards may be increased by up to 15% when greater values are attested in the material inspection certificate.
使用奥氏体钢时,根据材料标准规定的屈服强度或弹限强度的最低数值可最多提高15%,但需在材料检查证书中写明。
the quality assurance programme should include a record of proper pre-sorting and verification that each batch or recycled plastics material has the proper melt flow rate, density, and tensile yield strength, consistent with that of the design type manufactured from such recycled material.
质量保证方案应包括记录正确的预先分类并核实每批回收塑料具有恰当的熔体流率、密度和拉伸强度,与用这类回收材料制造的设计型号相符。