How is this stainless steel surface treated?
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The material is a thick-walled tube made of stainless steel; it feels somewhat smooth to the touch. How is this handled? What is its efficacy? As shown in the figure:
How can one tell that this is a pipe?
1. Requirements for raw materials； 2. Materials should be stored in a proper manner and protected properly ； 3. After manufacturing, polish + pickling and passivation! .