Galvanized Pipe DN50 Galvanized Steel Pipe DN100 Galvanized Large Diameter Pipe DN300-DN600 Seamless Steel Pipe

Galvanized Pipe DN50 Galvanized Steel Pipe DN100 Galvanized Large Diameter Pipe DN300-DN600 Seamless Steel Pipe

hardness
Stainless steel tube commonly used brinell, Rockwell, Vickers three hardness indicators to measure its hardness.
Brinell hardness
In the stainless steel tube standard, brinell hardness is the most widely used, often to indentation diameter to express the hardness of the material, both intuitive and convenient. However, it is not suitable for hard or thin steel pipes.
Rockwell hardness
The Rockwell hardness test of stainless steel tube is the same as brinell hardness test, which is the indentation test method. The difference is that it measures the depth of the indentation. Rockwell hardness test is a widely used method at present, among which HRC is second only to Brinell hardness HB in steel pipe standard. Rockwell hardness can be applied to determine from very soft to very hard metal materials, it makes up for the Brinell method is not, is simpler than brinell method, can be directly from the hardness machine dial read hardness value. However, due to the small indentation, the hardness value is not as accurate as buchwald method.
Vickers hardness
Stainless steel tube Vickers hardness test is also an indentation test method, can be used to determine the hardness of very thin metal materials and surface layer. It has the main advantages of Brinell and Rockwell methods and overcomes their basic disadvantages, but it is not as simple as Rockwell methods and is seldom used in steel pipe standards.
Hardness testing
The inner diameter of stainless steel pipe is more than 6.0mm, and the wall thickness is less than 13mm. The annealed stainless steel pipe can be tested by W-B75 Type Wechsler hardness tester. It is very fast and simple, and suitable for rapid and nondestructive inspection of stainless steel pipe. Stainless steel pipe inner diameter is greater than 30mm, wall thickness is greater than 1.2mm stainless steel pipe, rockwell hardness tester, test HRB, HRC hardness. Stainless steel tubes with inner diameter greater than 30mm and wall thickness less than 1.2mm were tested for HRT or HRN hardness by surface Rockwell hardness tester. For stainless steel pipes with inner diameter less than 0mm and greater than 4.8mm, rockwell hardness tester is used to test HR15T hardness. When the inner diameter of stainless steel pipe is greater than 26mm, you can also use Rockwell or surface Rockwell hardness tester to test the hardness of the inner wall of the pipe.