Scale reduction by reheating of slab

[LaciH]

Hi.

My question is: know somebody a new method of scale reduction by slab reheating?

Im use SiC powder now.
Im search new books or papers with this problem.

Thanx.

 

[Goahead]

If I understand correctly you remove (why reduce?) scale by grinding or by abrasive blasting using SiC.
You would like to remove scale by reheating?
You may be able to remove some scale because of the difference in the Coefficient of Thermal Expansion between Steel and Scale. But new scale will form immediately by oxidation in air. Therefore it does not seem a useful method.

http://www.welding-advisers.com/

 

[LaciH]

Hi Goahead!

Thank you for your answer!
But I want reduce scale formation during slab reheating.
I want use SiC and other compound in laboratory furnace to reduce scale formation and I dont want remove scale with SiC.
I think scale can be removed using water stream after reheating in pushing furnaces.

LaciH

 

[kenvlach]

Hi LaciH,
For laboratory furnace (small), some methods to avoid scale formation
1) Use an inert gas such as argon or a protective atmosphere (for the latter, need to avoid carburizing or de-carburizing conditions).
2) Bury mild steel parts in steel chips, or bury higher carbon steels in cast iron chips.
3) Use a ceramic paint designed for heat treating steel -- it protects the steel from oxidizing when heated in air, but then falls off when the steel is water-quenched. Some brands: Ceram-Guard from A.O.Smith Protective coatings, Aniscol 11 from Foseco, & Turco Pretreat by ELF Atochem.

Water blast is only used on large scale. See a book like The Making, Shaping and Treating of Steel.

 

[tomwalz]

A boron based flux?
Wrap it in stainless steel foil as is done with heat treating?

Thomas J. Walz
Carbide Processors, Inc.

http://www.carbideprocessors.com