YB／T 4339—2013和YB／T4340—2013二项连铸坯低倍枝晶组织缺陷评级图行业标准制定情况介绍

An introduction to the drafting of two standard rating diagrams YB/T 4339-2013 and YB/T 4340-2013 for macrostructure dendritic and defect in continuous casting slab

介绍了连铸钢板坯低倍枝晶组织缺陷评级图YB／T4339—2013和连铸钢方坯低倍枝晶组织缺陷评级图YB／T4340—2013制定的原则及其主要技术内容。

The principle and the main technical content of the standard drafting on dendritic defect rating diagrams YB/T 4339-2013 of continuous casting slab macrostructure and YB/T 4340-2013 of continuous casting billet macrostructure is introduced.