Onion Skin in Primary Process

[OffRoad10]

Has anyone come against a problem called onion skin, aka kish? This problem is a formation of a difficult to pickle scale on primary steel.

Let me know if anyone has heard or solved this problem.

 

[EdStainless]

What alloy? What is the hot process?
and How good is your blasting prior to pickle?

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[OffRoad10]

Grades - high carbon (0.50 and higher); 4130; 10B38

Hot Process - CSP caster into a 7 stand rolling mill. Approximatley 1600 finishing temp and 1190 coiling.

No processing prior to pickling; no scale breaker at pickle line either.

 

[EdStainless]

How good is your high pressure water blast between rolling stands?

You have patches of tight scale. You may need to blast or break to get rid of them.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[EdStainless]

Has this changed recently? If so you might look into the caster slag additives and the rolling lubes.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm