SANS 357-17
SANS 357-17 (Heat-treated steels, alloy steels and free-cutting steels Part 17: Ball and roller bearing steels)· SANS (南アフリカ) · 33 材料
SANS 357-17 (Heat-treated steels, alloy steels and free-cutting steels Part 17: Ball and roller bearing steels)· SANS (南アフリカ) · 33 材料