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Hi there, Could any one suggest as to why does clumping of sand occurs in fluidised beds ? we get good results from carburising & Q&T 's. we got new retort new diffuse & sand, all three month old we got 16 grit above diffuser about three inches high and 120 grit just under flue exit.(Furnace...

Never tried normalising, will try that Thanks for that Cheers

Thanks redpicker & metengr Much appreciated ! we have been redoing the quench & temper jobs quite often, never was able to make up a precise tempering temperture propotinate to Brinell hardness. we got good austenising temperature & quench, its the temper which always kills my hardness...

Thanks metenger & redepicker, We got controlled pit furnace very accurate with a maximum rated load of 10,000kgs. Its very precise with carburising procedures and temperatures. Furnace fluctatues with in a degree and gives consistent temperatures with thermocouple on job. Its just the times...

Can some body help me with the holding time in austenising stage as well as tempering. I read an article which you guys recommend for 11 inch bar,Feb 2011 The heat treatment process of this heat of material, 11'' OD: Hardened 1600F 7.0 Hours Oil Quenched Tempered...