sandvik 20AP是什么材料？相当于中国的什么牌号？

Sandvik Bioline 20AP is a hardenable, free-cutting carbon steel combining excellent machining properties, high hardness and dimensional stability during hardening. Very suitable for long narrow components with tight tolerances such as shafts, dental burrs and other fine mechanical components.
Service temperature -50 to +100 ℃. Prolonged service at elevated temperatures causes decreased hardness when used in the hardened and tempered condition.
瑞典山特维克Sandvik Bioline 20AP
化学成分：
C0.95~1.05; Si≤0.30; Mn0.25~0.50; S0.035~0.055; P≤0.035; Pb0.15~0.25.
Sandvik Bioline 20AP是一种含铅高腾碳易切削钢，是制造精度手表零件的重要材料之一。
Sandvik Bioline 20AP高精密研磨棒广泛用于轴件,特别对热处理后要求较高表面硬度的细长小轴件等。
Sandvik Bioline 20AP成品钢中，铅颗粒细小（＜3μm），分布均匀，其显微组织为3-4级粒状珠光体，具有良好的被切削性能。经手表厂坚定，被切削性能比从日本进口的同类钢好。

Sandvik 20AP是高碳易切钢，为瑞士的牌号，也就是国内的高碳钢

因其优越的切削与机械性能及高耐磨性，加工精度高，热处理变形小而被使用在精密零件、手表零件及汽车ABS系统中

材料牌号: Bioline 20AP
标准： PROPRIETARY
钢组： 结构钢
Producer: Sandvik

化学成分 (%)
C ≤ 1.0000
Mn ≤ 0.4000
P ≤ 0.0300
S ≤ 0.0500
Si ≤ 0.2000
Cr ≤ 0.1000
Ni ≤ 0.1000
Mo ≤ 0.0300
Pb ≤ 0.2000

与我国材料无对照