The bar is produced by forging of ingot. After forging cooled slowly to atmosferic temperature. There is no quenching.
The crack is big and longitudinal.
I show an example.http://files.engineering.com/getfile.aspx?folder=5ba70389-bddd-4a50-be07-26dd5b13a935&file=Doc2.docx
Here is aa picture of the defect.
This is tipical after rolling and quench in water. The temperature of the bars before quenching is over 900º C.
The bars are formed in two rolling steps, coming from ingot. The heting temperature before rolling is over 1250º C. The rolling temperature is over...
Sorry, the question was not understandable.
I have the problem during the cooling after forging or rolling, above all in big sizes. I try to cool the bar as low as posible until it can be trasferred to a annealing furnace. But this is a very slow proceess.
I have diametral internal craking problems (big internal cracks) in superduplex round bars during water cooling. Of course, above all in big sizes.
Which is the best option to avoid this defect?
I would like to eliminate a post solution annealing after cooling on air.
The main problem of water quenching after forming, without a previous solution annealing treatment, is the risk of craking ("clink") above all in hight diameters. How could this problem be solved?
