Effects of high temp. on welded structure.
Effects of high temp. on welded structure.
(OP)
I have a pallet system that will carry a steel coil into a heated tunnel for conditioning. The temperature will be 750 Celsius. The exposure time can be up to 60 minutes. Is there a source of well documented effects of this temp. on a welded structure? Also what will happen to any bearings or hardened shafts that I have in my assembly? I am worried about warping and material degradation.
Thanks for any reply.
Thanks for any reply.
Ward Holloway, Jr, PE





RE: Effects of high temp. on welded structure.
Based on your post, the temperature effects on the material will depend on the material of construction (MOC). At 750 deg C (1382 deg F), all carbon and most low alloy steels will loose strength at this temperature. Materials that are hardened by thermal treatment will age and loose strength.
What are your MOC?
RE: Effects of high temp. on welded structure.
UNS K02600 and UNS K03000
Ward Holloway, Jr, PE
RE: Effects of high temp. on welded structure.
I would suggest using 304 ss in lieu of carbon or low alloy. What you need is creep strength and oxidation resistance from exposure to repeated thermal cycling. The 304 tubing and plate would fit the bill, and is readily weldable. Any issues related to sensitization are mute because this is not exposed to aqueous service conditions.
RE: Effects of high temp. on welded structure.
Ward Holloway, Jr, PE
RE: Effects of high temp. on welded structure.
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If you have access to ASM Handbooks, review Volume 1.
Last for effects on elevated temperature behavior, you can look for this free handbook over the Internet. it contains elevated temperature mechanical property data for low alloy steels;
MIL-HDBK-5H
Metallic Materials for Elements in Aerospace Vehicle Structures
RE: Effects of high temp. on welded structure.
What sort of cast materials do you have on mind. Can you consider a Cr containing Cast iron having a chemistry
C 3-3.2%, Si 1.8-2%, Mn 1% max, Cr 0.6-0.7%, Ni 1%, Mo 0.2% (optional).
Ni Resist D1 type can also be considered .
However not all parts of the pallet can be made as cast for the shaft and bearings you may still need to consider 304,but this may be a small quantity and will not affect your cost.
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Effects of high temp. on welded structure.
You will need an alloyed material to resist scaling, grain growth, and to have any strength at temp.
This cannot be done with plain carbon steels.
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