光亮钢制品.交货技术条件.第2部分:一般工程用钢 EN 10277-2 - 2008

① Steels with improved machinability as a result of the addition of higher sulphur contents up to around 0,10 % S (including resulphurized steels with controlled inclusion content (e.g. Ca-treatment)) (modern method) or lead may be supplied on request. In the first case the upper limit for the manganese content may be increased by 0,15 %.
②Elements not quoted in this table shall not be added intentionally to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat. All reasonable precautions shall be taken to prevent the addition of such elements from scrap or other material used in the manufacture which affect the hardenability, mechanical properties and applicability.