Processing requirements for Stainless Steel Pipe Ferritic

What are the ways to remove Duplex Stainless Steel Pipe?

Austenitic Stainless Steel Pipe/Tube

ASTM A790 Stainless Steel Pipe, Nickel Based Alloys Tube, High Quality Seamless Boiler Tube

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ASTM B163 UNS N08800 Nickel Alloy Tube

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ASTM A312 TP321/321H STAINLESS STEEL PIPE

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ASTM A928 UNS S31803 Stainless Steel Tube

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Ferritic Stainless Steel Pipe/Tube 

What is food grade stainless steel?