Mechanical properties of Xi'an stainless steel welded pipe

Edit:Shaanxi Tonghui Steel Co., Ltd.UpDate:2020-01-09

The mechanical properties of Xi'an stainless steel welded pipe : 316L stainless steel welded pipe is a basic pipe, so it also has a lot of hard and necessary indicators, including many aspects. Below we will talk about the hardness index of 316L stainless steel welded pipe. According to the test method Different from the combined range, hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, micro hardness and high temperature hardness.

Brinell, Rockwell and Vickers hardness are commonly used for pipes. A, Brinell hardness (HB uses a certain diameter steel ball or cemented carbide ball, and presses it into the surface of the pattern with a defined test force (F). The test force is removed after the retention time is determined, and the Brinell hardness value of the indentation diameter (L) of the sample surface is measured as the quotient obtained by dividing the test force by the spherical surface area of ​​the indentation. Expressed in HBS (steel ball), the unit It is N / mm2 (MPa and its calculation formula is in the formula: F--the test force for pressing the surface of a 316L stainless steel welded pipe sample, N, D--the diameter of the steel ball for testing, mm d--the uniform diameter of the indentation, mm. The determination of Brinell hardness is more accurate and reliable, but generally HBS is only suitable for metal materials below 450N / mm2 (MPa), and it is not suitable for harder steel or thinner 316L stainless steel welded pipes. In the 316L stainless steel welded pipe scale, Brinell hardness It has a wide range of uses.The hardness of the material is often expressed by the indentation diameter d, which is intuitive and convenient.

Example: 120HBS10 / 1000130: indicates that a Brinell hardness value measured with a 10mm diameter steel ball under a 1000Kgf (9.807KN) test force for 30s (seconds) is 120N / mm2 (MPa). B, Rockwell hardness (HK The Rockwell hardness test is the same as the Brinell hardness test.It is an indentation test method. The difference is that it measures the depth of the indentation. That is, the order of the initial test force (Fo) and the total test force (F). Under the action, press the indenter (cone or steel ball of Jinsteel Plant) into the surface of the sample, and after the retention time is determined, the main test force is removed, and the hardness value of the measured residual indentation depth increment (e) is used to calculate the hardness value. .

Its value is an anonymous number, which is represented by the symbol HR. The scales used are A, B, C, D, E, F, G, H, K, and 9 scales. Among them, the scale commonly used in 316L Xi'an stainless steel welded pipe hardness test is generally A. , B, C, that is, HRA, HRB, HRC. The hardness value is calculated by the following formula: When testing with A and C scales, HR = 100-e When testing with B scale, HR = 130-e where e-- The increment of the residual indentation depth is shown in the demarcated unit of 0.002mm, that is, when the indenter is axially displaced by one unit (0.002mm), it is equivalent to a change in Rockwell hardness.