A550

A550 (铌铁 (Ferroniobium) 标准规范)· ASTM (美国) · 3 种材料

名称	材料组别
A 550 Alloy and Stainless Steel Grade	铌	chevron_right
A 550 High Purity Grade	铌	chevron_right
A 550 Low Alloy Steel Grade	铌	chevron_right