
Heat-treatable steels, alloy steels and free-cutting steels; part 14: hot-rolled steels for quenched and tempered springs
出版:International Organization for Standardization

专家解读视频
Heat-treatable steels, alloy steels and free-cutting steels; part 14: hot-rolled steels for quenched and tempered springs
出版:International Organization for Standardization
专家解读视频