Re: bending cast iron

Posted by T_Bone on February 05, 2001 at 10:20:21 from (207.254.52.202):

In Reply to: bending cast iron posted by David Saville on February 04, 2001 at 20:51:33:

Hi David, what you have is cast steel. No problem about heating the part and straighting. It would be best to heat the part to a dull red then apply a small amount of pressure to bend while continuing to heat the piece until it bends. A piece of pipe slipped over the piece will work great as a bender. If you put too much pressure and too little heat the metal will tear and will need to be welded. Keep your working tools off the bores and try not to apply pressure at a bore without first putting a support pin in the bore. The inside of the bend will have more heat applied than the outside so it can stretch.

When the part is straighten, let it cool, then reheat to a dull red and quinch in oil. This adds a small amount of temper to the steel. If you try and quinch without the cool down the part will become brittle and crack.

Take your time and let the metal tell you what it needs. Place the pipe edge at the spot that needs to bend and the part will bend in that spot. If it doesn't bend easy then you need more heat or a different leverage point.

Sometimes the part will tear because it fractured when it bent. In this case just continue to straighten the parts and weld back together, then temper.

T_Bone

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