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鑄鐵材質標準 Gray lron 灰鑄鐵 Standard-Spec.No.&Class 標 準 T.S. σb≥ N/mm 2 Hardness HB≤ Note:(1)Test Bar θ=30mm(2)Chemieal composition and other requirement can be established upon written agreement between manufacturer and purchaser.(3)The hardness values are for castings of 15~30mm thickness. 注: (1)試棒直徑 =30mm;(2) 化學成分和其它要求可與 客戶商定; (3)硬度值適用于 15-30mm 壁厚鑄件 GB China/ISO JIS JAPAN ASTM U.S.A. HT20