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high heat effects

high heat effects

high heat effects

(OP)
Can someone give me an idea or reference for infomation on the effects of high heat on A36 steel properties. What happens to Fy and E at temperatures around 1500 deg C (2730 deg F)

THANKS

RE: high heat effects

I imagine you meant 1500 F.  Even that temp is way beyond what A36 should be used at.

RE: high heat effects

(OP)
Thanks.

The steel in question is part of a burner lance in a cement kiln...1500 deg C. The lance is encased in a refractery, but I was curious what effects temperature has on the steel alone. I suppose it is not a valid question, the refractery must be there or the steel will melt.

Forgeting the high temperature of the kiln, is there a rule of what happens to yield stress and modulus at high temeratures?

RE: high heat effects

the rule is they both go down. Modulus varies linearly as temperature. and If I remember correctly Yield remains relatively stable until the strengthening mechanism for the material is exceeded. Then it falls off rapidly.

I think its MIL-HDBK-5J that has the graphs of modulus vs temp.

RE: high heat effects

YS can actually drop so fast you wouldn't believe it.  I've measured something like a 30% drop at 500 deg F. in both A36 and some low alloy steels.  It varies greatly even with diff. heats-never could figure out why.

You'd expect this w/alum. alloys but it happens with steel too.

RE: high heat effects

Metalguy,
When I was in the steel making business, A-36 was next to the bottom of the barrel; only steel "lower" being continuous butt welded "Fence Post". A-36 was a dumping ground for high strength materials that didn't meet chemical requirements. The permitted chemistry variations and melting practices of A-36 gaurantee substantive changes in mechanical properties with temperature from heat to heat.  

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