mild steel 
noun [mass noun]
Steel which contains only a small percentage of carbon and is strong and easily worked but not readily tempered or hardened.The high-melting-point solders are suitable for soldering mild steel, stainless steel, nickel, copper, brass, zinc, and silver directly to aluminum....
- The company plans to produce mild steel, stainless steel, aluminium, copper and brass on the site.
- These are made of mild steel, stainless steel, or copper, and are placed under the joint and subsequently removed when the weld has been completed.
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