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What is the quality standard of 304 stainless steel pipe?

by:HHGG     2021-05-01
What is the quality standard of 304 stainless steel pipe? 2019-07-30    Although the development of 304 stainless steel pipe is becoming more and more common in our country, in fact, everyone is not clear about the quality standard of 304 stainless steel pipe. When many people buy 304 stainless steel pipe, their choice is based on the price. Today, the editor of the 304 stainless steel pipe manufacturer simply sorted out the 304 stainless steel pipe quality standards, hoping to help everyone choose stainless steel pipes better. The length of    2,304 stainless steel pipe shall be implemented in accordance with the provisions of the purchaser and the buyer in the order contract or agreement. 3. The curvature of the 304 stainless steel tube is less than or equal to 15mm/m   4. The out-of-roundness of the 304 stainless steel tube is less than 75% of the outer diameter tolerance. 5, the chemical composition of the stainless steel conforms to the national standard GB/T12770-1991   6, the mechanical performance index of the stainless steel It conforms to the national standard GB/I12770-1991  7, and the delivery state of stainless steel is annealed state.  8, the surface quality of the stainless steel pipe is in the delivery state, the surface brightness is consistent, the welding seam is full, and there is no damage.     The crack resistance of the stainless steel pipe after bending: After the stainless steel pipe is bent, cracks are not allowed in the bending position.  Inspection method  1, the outer diameter, inner diameter, and outer dimensions are measured with a vernier caliper; the arc position is measured with an R gauge; the length dimension is measured with a ruler, and the wall thickness of the stainless steel pipe is measured with a special dry ruler.  2, the out-of-roundness of the stainless steel round pipe is symmetrically measured with a vernier caliper at three places of the outer diameter of the pipe, and it is expressed as the difference between the maximum value and the minimum value.  3, the chemical composition inspection of stainless steel entrusts an external inspection agency to inspect.  4, the random sampling inspection of the surface quality of stainless steel pipes is carried out according to the sampling inspection regulations.  5, the surface quality inspection of stainless steel tube blanks, visual inspection under adaptable natural light, the visual distance is 45±5cm  6, the surface quality inspection of the stainless steel tube after polishing is performed according to the polished surface quality inspection standard of the stainless steel tube.  7, the stainless steel round pipe imitates the cold bending test at room temperature to check the crack resistance of the steel pipe.  The bending angle is 90, the bending radius is based on the bending radius of the product, and the weld is located on the inner side of the bending direction.   After the bending is completed, observe whether the weld is cracked.   The above is some content about the quality standard of 304 stainless steel pipe compiled by the editor. Of course, when buying 304 stainless steel pipes, you cannot buy them in accordance with the above standards, but the above standards can help you buy better quality stainless steel pipes.   Copyright statement: The article comes from the Internet, and the forwarding is only for the sharing of opinions. The copyright belongs to the original author. Thanks to the original author for his hard work. If there is any infringement, contact to delete it.  
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