316L stainless steel welded pipe is a basic, so it's necessary to have a lot of hard targets, including many good following, we want to say about the hardness index 316L stainless steel pipe, according to the test methods and combined range of different hardness again can be divided into Brinell, Rockwell hardness of stainless steel pipe, Vickers hardness, Shore hardness, micro-hardness and high temperature hardness. For pipes commonly used Brinell, Rockwell, Vickers hardness of three kinds. A, Brinell hardness (HB with a certain diameter steel balls or carbide ball, test force (F) to delineate the pattern pressed into the surface, the designated holding time after removing the test force, measuring the diameter of the sample surface indentation . (L) Brinell hardness test force is divided by the surface area of ??the resulting quotient spherical indentation with HBS (ball), said unit N / mm2 (MPa formula is the formula: F-- pushed 316L stainless steel test force pipe sample surface, N stainless steel pipe prices, D-- test ball diameter, mm d-- indentation uniform diameter, mm. Brinell hardness measurement more accurate and reliable, but generally only fit for HBS 450N / mm2 (MPa) below the metal material, for harder or thin steel 316L stainless steel pipe used substandard in 316L stainless steel pipe scale, the most extensive use of Brinell hardness, often indentation diameter d to represent the hardness of the material both intuitive and easy. Shandong Jinding Stainless Steel Pipe Co., Ltd. of annealed and non-annealed stainless steel pipe how to distinguish? annealed stainless steel welded pipe is a heat treatment process, its purpose is to eliminate the residual stress, stable size Shandong stainless steel pipe, reducing deformation and cracking tendency light difficult to distinguish with the naked eye there annealed stainless steel pipe, so it can take a few ways to help you identify, today Xiaobian to introduce you to some of this knowledge. 1, tubes can be used to determine the echo. with slightly larger force percussion pipe, Fuer listen to the echo tube at the mouth, if the echo of the voice is high and relatively sharp, then has been annealed. So why would produce higher echo? Is pieces due to internal crystal annealing compare uniform and dense caused Organizational no defect annealing which will be more, will absorb most of the acoustic energy, so the echo at the mouth of the tube is relatively small. If you can afford to use sonar to detect. 2, with an accuracy better digital multimeter, measure each pipe unit length (for example 2 meters) of the resistance. The resistance of stainless steel is relatively large, the resistance after annealing without annealing smaller than in the liquid before the test can not be left in the above. Not all manufacturers of stainless steel pipe will go through this annealing process, so you have to learn how to use the above method to distinguish between annealed and non-annealed stainless steel welded 304 stainless steel pipe stainless steel pipe 28mm, this will allow you to avoid buying an inferior race in the purchase process charge a good product. Jinding stainless steel pipe manufacturer's suggested you, good quality, good quality, select TIS, high quality and your peers. 201 stainless steel pipe, Jinding Industry (certified), stainless steel pipe from Shandong Jinding Stainless Steel Pipe Industry Co., The company provides Shandong Jinding Stainless Steel Pipe Co., Ltd. (www.jdbxg.cn) is Dezhou, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinding tube industry leader in the staff warmly welcome all inquiries negotiations to create Jinding Pipe a better future.