While a majority of the stem may be made from a titanium-based powder material, its tip may be made of a high strength hardenedmaterial, such as a steel alloy.
而杆的大部分可由钛基粉末材料制成，其杆头可由高强度硬化材料，例如钢合金制成。
2
We can imagine that a lump of wet clay somehow ended up in the fire, dried out, hardened and formed a hollow shape; a shape that could hold things, in a tough material.
Where austenitic bolting materials have been carbide solution treated and strain hardened, they are designated Class 2 in ASTM A193. ASTM A194 nuts of corresponding material are recommended.