Related Clues:
- Iron-carbon alloy
- Shade of blue or gray
- It's often forged
- Type of wool
- With 66-Across, a utility fitting
- Iron alloy
- Cookware material
- Nerve material?
- "Buns of ___"
- Metal
- Inflexible, as some rules
- 'Buns of ___' (5)
- Eleventh anniversary gift
- Anniversary gift between tin and silk
- Pittsburgh product, once