Re: Re: What's the difference between cast iron and steel ???

Posted by Fred OH on October 22, 2001 at 08:52:54 from (208.32.116.52):

In Reply to: Re: What's the difference between cast iron and steel ??? posted by Steven on October 18, 2001 at 12:04:50:

Malleable iron is cast iron that is heat treated for about a week in a large furnace. This gives it the ability to bend a little before breaking,( called malleability) It is usually identified by looking at a fresh fracture and seeing a thick skin on the outside, which is thicker than the skin on cast iron. It is just some of the sand that fused during the sand molding process, that prevents it from rusting like steel. A common problem with malleable iron is when it is repair welded, it reverts back to cast iron if it goes past a certain temperature. Probably best to braze it and keep the temperature just high enough to flow the brass. Maybe some student of metalurgy will give us an explanation as to why it reverts back to cast, an interesting question. L8R----Fred OH

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