18CRNIMNMOA

GB/T 3077—1999 Table 1 heat analysis mass fraction wt%; This record is based on the actual 1999 edition and shall not be replaced by the 2015 edition.. Grades marked A in the table are ordered as high-quality steel.; P/S/Cu and residual Mo in Table 2 are according to the corresponding quality grade.; Residual Cr/Ni/Mo limits do not cover alloy compositions already listed in Table 1.. The chemical compositions of this standard are also applicable to steel ingots, blooms, and their products.; Bar product ranges and mechanical properties/surface quality requirements cannot be directly extended as guarantees for wire cold-heading.. If the processing purpose is not specified in the contract, it shall be treated as machining.; Cu ≤ 0.20% during hot working; please select the corresponding condition.. Clause 6.1.1.2: Residual W/V/Ti shall be analyzed and recorded in the quality certificate; where no unified limit is listed, do not fill in 0.; Alloy W/V/Ti ranges in Table 1 are still retained.. Upgrading to A/E quality or specifying separate compositions according to Table 1 Note 2 requires separate order verification; grades shall not be automatically merged, nor shall the C range of this line be rewritten.. Rare earth 0.05% in Table 1 Note 4 is the calculated addition amount; finished product analysis is for reference only and shall not serve as a guaranteed composition range.. Analysis deviations for finished steel or bloom products shall be verified separately according to the referenced GB/T222–1984; heat analysis limits shall not be automatically relaxed..