Identification of stainless steel seamless pipe

A magnetic test Magnetic test is the easiest way to distinguish annealed austenitic stainless steel and ferritic stainless steels . Non-magnetic austenitic stainless steel, but by a large reduction will have a mild cold magnetic ; while pure chromium steel and low alloy steels are ferromagnetic . Second, the point of nitric acid test A notable feature stainless steel tube is concentrated nitric acid and dilute nitric acid has inherent corrosion resistance. This performance so that it can be easily distinguished from most other metals or alloys .

However, high carbon steel type 420 and 440 points during nitric acid test is slightly corroded , non-ferrous metals will immediately encounter concentrated nitric acid corrosion . And dilute nitric acid has a strong corrosive to carbon steel . Third, carbon seamless steel pipe manufacturer china the copper point test Copper sulfate point test is the easiest way to quickly differentiate ordinary carbon steel and stainless steel of all types . Copper sulfate solution concentration used is from 5 to 10% .

Before proceeding point test , the test area should be thoroughly remove grease or various impurities, Polishing cloth and polished with a small area , then use copper sulfate solution drip drip bottle area to clean up after . Ordinary carbon steel or iron in a few seconds, the surface layer is formed of copper , stainless steel and the copper surface is not generated or display color of copper precipitation .

Hebei ChongSheng Special Steel Pipe Co.,Ltd.