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類似于AISI302/304但隨著鉬的加入提高了耐腐蝕性，尤其對硫酸化合物。這些球廣泛應用在接觸油墨，感光化學品，漂白劑，染料和硝酸的地方。這是唯 一的奧氏體鋼用于制造球，可以是非磁性的。

Similar to AISI 302/304 but,with the addition of molybdenum improves corrosion resistance particularly to sulphuric acid compounds. These balls are used extensively in applications where contact is made with inks,photographic chemicals,bleaches,dyes and nitric acids. This is the only austenitic steel for ball manufacture and can be non magnetic.