AttributeSurface resistance less than 1000 megabytes; Wear protection; Scalable; Excellent chemical resistance; Good resistance to alkali metals and acidity; Strong toughness; Flame retardant.HardnessStainless steel pipes are commonly used to measure the hardness of Brinell, Rockwell, Vickers three hardness indexes.Brinell hardnessIn the stainless steel pipe standard, Brinell hardness is the most widely used, often to indentation diameter to indicate the hardness of the material, both intuitive and convenient. But for harder or thinner steel pipe is not suitable.Rockwell hardnessThe Rockwell hardness test for stainless steel pipe is the same as the Brinell hardness test. The difference is that it measures the depth of the indentation. Rockwell hardness test is a widely used method at present, and HRC is second only to Brinell hardness HB in steel pipe standard. Rockwell hardness can be applied to the determination of very soft to very hard metal materials, it makes up for the Brinell method is not, more simple than Brinell method, can be directly from the hardness machine dial read hardness value. However, because of the small indentation, the hardness value is not as accurate as the Brinell method.Vickers hardnessThe Vickers hardness test for stainless steel tubes is also an indentation test method that can be used to determine the hardness of very thin metal materials and surface layers. It has the main advantages of Brinell and Rockwell process and overcomes their basic disadvantages, but it is not as simple as Rockwell process and Vickers method is rarely used in steel pipe standards.Hardness testingFor annealed stainless steel pipes with inner diameter above 6.0mm and wall thickness below 13mm, W-B75 Wechls hardness tester can be used. The test is very fast and simple, which is suitable for rapid and nondestructive qualified inspection of stainless steel pipes. The HRB and HRC hardness of stainless steel tubes with inner diameter greater than 30mm and wall thickness greater than 1.2mm are tested by Rockwell hardness tester. For stainless steel tubes with inner diameter greater than 30mm and wall thickness less than 1.2mm, use surface Rockwell hardness tester to test HRT or HRN hardness. For stainless steel pipes with inner diameter less than 0mm and greater than 4.8mm, the hardness of HR15T is tested by Rockwell hardness tester dedicated to pipe. When the inner diameter of the stainless steel pipe is greater than 26mm, Rockwell or surface Rockwell hardness tester can also be used to test the hardness of the inner wall of the pipe.Stainless steel pipe is a kind of economic cross-section steel, is an important product in the steel industry, can be widely used in life decoration and industry, many people in the market for making stair handrails, window protection, railings, furniture and so on. There are two common materials, 201 and 304.The stainless steel pipe is safe and reliable, health and environmental protection, economical and applicable, the thin wall of the pipe and the successful development of the new reliable, simple and convenient connection method, so that it has more advantages that other pipes cannot be replaced, the application in the project will be more and more, the use will be more and more popular, and the prospect is promising.Stainless steel pipe connection modes are various, the common types of pipe fittings are compression type, compression type, loose type, push type, push thread type, socket welding type, loose type flange connection, welding type and welding and traditional connection combination of derived series connection. These connection modes, according to their different principles, its scope of application is also different, but most of them are convenient to install, firm and reliable. The sealing ring or gasket material used for connection is mostly made of silicone rubber, nitrile rubber and EPthree rubber which meet the requirements of national standards, so as to avoid the worries of users.Clamp and pressure connection steps1. Broken pipe: cut the pipe according to the required length. When broken pipe, do not use too much force to prevent the pipe from being round.2. Remove burrs: After the pipe is cut off, the burrs should be removed clean to avoid cutting the sealing ring.3. Marking: In order to completely insert the steel pipe into the fitting socket, the insertion length must be marked and marked at the pipe end.4. Assembly: The sealing ring should be correctly installed in the U-shaped slot of the pipe fitting. Insert the pipe into the socket of the pipe fitting and wait for crimping.5. Crimping: When crimping, the raised part of the pipe fitting is placed in the concave groove of the mold, and the clamp mouth is perpendicular to the pipe axis.6. Check: after the completion of the crimping, use a special gauge to check the size of the crimping.