June 3, 201214 yr I have acquired some 1.5" round bars of 7120 from my work and was wondering if anyone had any experience forging this steel. It is a tungsten chromium steel with 1% tungsten and 20 points of carbon. I think it will be hard to forge but will hold up well as hot work tooling. Any information would be helpfull. Daniel
June 3, 201214 yr What was the round bar used for ? sounds like a shaft for an electric motor.tungsten is one of the hardest steels. i believe your bar would fall into the high speed steel category. From my exp.welding with tungsten and any other steel with high chromium.over heating is a big issue.Also with steel of this kind at high temps the metal will release what is called( hexavalent crome).Whitch is very toxic too the body.This is from a Welding stand point.When forging I am not sure. Also tungten and high chromium.Will (suger) or get crusty at over heated temps.
June 4, 201214 yr Pretty sure the chrome needs to melt to release toxic gas- even forge welding does not come close to those temps.
June 4, 201214 yr That stuff will be tough to move under the hammer. I can't think of anything that it would make that would be usefull around my shop. It wouldn't get hard enough for most tooling, although it might make a good hot punches, chisles and such. Give it a go, it might be worth the effort.
June 4, 201214 yr Dunno if this helps you much, http://www.thefabricator.com/article/metalsmaterials/carbon-content-steel-classifications-and-alloy-steels http://en.wikipedia.org/wiki/SAE_steel_grades Major classifications of steel[1] SAE designation Type 1xxx Carbon steels 2xxx Nickel steels 3xxx Nickel-chromium steels 4xxx Molybdenum steels 5xxx Chromium steels 6xxx Chromium-vanadium steels 7xxx Tungsten steels 8xxx Nickel-chromium-vanadium steels 9xxx Silicon-manganese steels Maybe with a press could could save some work.
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