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How to improve surface roughness in shot blasting structural steel

My name is G.THULASIRAMAN from india.
I am a mechanical engineer working in a structural fabrication company.We have shot blasting machine in which we get plates cleaned but without surface roughness.I want suggestions.

Thulasiraman Ganesaraju
Advisor Development - Bangalore, Karnataka, India
September 27, 2011

Hi, Thulasiraman.

When you ask to "improve" surface roughness, I'm not sure if you are trying to achieve a rougher surface (for example, for better paint adhesion), or if you are trying to reduce the surface roughness. But I don't think you can shot blast your way to a polished surface.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
September 27, 2011

I agree with Ted's interpretation. If you want a rougher surface profile, you need to use a crystal type media such as garnet. Maybe alum. oxide might do the job as well; however, it creates other problems for operations after blasting

AF Kenton
retired business owner - Hatboro, Pennsylvania
October 2, 2011

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