This Quality Tungsten Ring is Cobalt Free to avoid allergies and it has the Carbide to make it Scratch Resistant.
这个品质钴钨环是免费,以避免过敏,而且有硬质合金,使其耐划痕。
2
This Tungsten Ring is Cobalt Free, to avoid allergies and it has the Carbide to make it Scratch Resistant.
这是钴钨环免费,为了避免过敏,而且有硬质合金,使其耐划痕。
3
The conventional producing process of cemented carbide was applied on the basis of replacing cobalt partly with iron and nickel and the mixed rare earth of different content was added.