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How to distinguish between 304 stainless steel and 316 stainless steel screws? __ wire mesh products co. , LTD

Small make up today received a customer enquiry, asked 304 stainless steel screws and 316 stainless steel screws can see with the naked eye, to this, the small make up to the customer a negative answer. Stainless steel screw determine its brand is very difficult with the naked eye, it is almost impossible to determine. Even a career in screw longer technical personnel. Whether 304 stainless steel, stainless steel screw is still 316 stainless steel, is still 302 stainless steel screws are difficult to tell with the naked eye, because the stainless steel screw appearance color is almost the same. Not to be know, some people say that use magnets can tell the difference of stainless steel and carbon steel, this is also unreliable, stainless steel screws on the postpartum and its performance will also attack changes, non-magnetic stainless steel wire, after yield into screw will have magnetic, and it is unable to prevent. So let's use the naked eye or brief magnet things cannot distinguish whether the stainless steel screw, when buying stainless steel screws, we must choose to have actual strength have integrity screw manufacturer to make acquisitions. If necessary, to the manufacturer with screw wire detection statement. From the beginning of source control and stainless steel screw, quality more assured.
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