In the production process of
precision seamless pipes (smls pipe), the hardness of steel pipes should be measured frequently to measure the degree of completion of steel pipe processing technology, process adjustment and heat treatment adjustment, so that the functions of steel pipes can meet the policies required by customers. The hardness of steel pipes is generally measured by three hardness policies: Brinell, Rockwell, and Vickers. Today we will discuss the hardness measurement of steel pipes.
1. Steel pipe Brinell hardness.
In precision seamless pipe specifications, Brinell hardness is the most widely used, and the hardness of the data is often displayed through the indentation diameter, which is intuitive and convenient. But not suitable for hard or thin steel pipes.
2. Rockwell hardness of steel pipe.
The Rockwell hardness test of precision seamless pipes is the same as the Brinell hardness test, which is an indentation test method. The difference is that it measures the depth of the indentation.
The Rockwell hardness test of precision seamless pipes is now widely used, among which HRC is second only to Brinell hardness HB. Rockwell hardness can be used to measure metal data from extremely soft to extremely hard. It makes up for the shortcomings of the Brinell method, which is simpler than the Brinell method, and can directly read the hardness value from the dial of the hardness tester. However, due to the small indentation, the hardness value is not as accurate as the Brinell method.
3. The Vickers hardness of the steel pipe.
The Vickers hardness test of precision seamless tubes is also an indentation test method that can be used to measure very thin metal data and surface hardness. It has the main benefits of the Brinell and Rockwell methods and overcomes their fundamental flaws, but is not as concise as the Rockwell method. Vickers method is rarely used in steel pipe specification.
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