A.30~35HRC B.40~50HRC C.62~72HRC D.80~90HRC
A.0.2~0.16 B.0.33~0.25 C.0.77~0.42 D.2.3~0.83
A.純銅 B.硬性金屬 C.薄壁管子 D.厚壁管子