grit Blasting 13cr steel

[hibberd]

blasting surfaces to apply bonding agents to bond rubber

hallo, my name is Roger and I am work for a Ditch Rubber Company.
We need to shotblast surfaces to apply bonding agents to bond rubber to various items, usually Industrial rollers. For our oil and gas industry clients we often are required to bond rubber to 13cr and sometime Incalloy pipes. Do do this we are required to change out our grit blasting system to non ferrous grit, this is a huge job for one or two pipes. Whilst we can understand this for the likes of the Incalloy or very high chrome items it is diffecult to understand for 13cr pipes as they are predominantly ferrous. Can any one advise or point me in the direction of advice for the correct blasting or normal 13cr pipes (not super 13Cr.)

My thanks

Roger

[MichiganMan]

I suppose that this is more of a question for your adhesive manufacturer than anything. If your biggest issue is having to change out the grit and you have the ability to machine the pieces, then I might ask the adhesive manufacturer (and client) if they would feel comfortable with rough cut threads for profiling. Many adhesive manufacturers suggest this practice rather than abrasive blast in some applications similar to yours. "Correct" blasting perameters is a very dubious term. The standard that you are looking for determines correctness. I would suggest in this case that the adhesive manufacturer can give you a specification for cleanliness and profile and that as long as you follow their standards and suggested testing methods you should be fine.

[hibberd]

I suppose that this is more of a question for your adhesive manufacturer than anything. If your biggest issue is having to change out the grit and you have the ability to machine the pieces, then I might ask the adhesive manufacturer (and client) if they would feel comfortable with rough cut threads for profiling. Many adhesive manufacturers suggest this practice rather than abrasive blast in some applications similar to yours. "Correct" blasting perameters is a very dubious term. The standard that you are looking for determines correctness. I would suggest in this case that the adhesive manufacturer can give you a specification for cleanliness and profile and that as long as you follow their standards and suggested testing methods you should be fine.

My thanks for your reply. My question was not clearly formulated, sorry. This isnt an adhesive problem, we have those all sorted but is based around the metallurgy of using ferrous grit on 13Cr pipes as I am unable to formally find out what grit is or is not acceptable for this work. Appreciate your time and answer, Roger

[Gordon]

Hi Roger

to the Surface Engineering Forum.

I suppose that there may objections to using steel/iron based grits on grounds of corrosion. However good the blasting, some residue/embedded grit will always remain. Ceramic base grits may be thought of as being more inert and less problematical. I would discuss this with your oil and gas industry clients, as they may have good (or bad) reasons for their specification.