The hardness of weathering metal steel sheet introduces the characteristics of weathering metal steel
The construction industry is inseparable from weathering metal steel plates. In order to have a better and deeper grasp of sheet metal, I will explain weathering sheet metal in detail. Weathering steel can be divided into tensile strength, Rockwell hardness, Brinell hardness, Shore hardness, microscope strength and high temperature 1 strength according to the strength. Among them, there are generally three types of Brinell hardness, Rockwell hardness and Brinell hardness.
1. Tensile strength (HB)
Use a bearing steel ball or carbide tool ball with a certain diameter to press into the surface of the model with the required experimental force (F), remove the experimental force after the specified maintenance time, and measure the surface layer of the imprinted diameter (L) specimen. The tensile strength value is the quotient of the experimental force divided by the area of the embossed ball. In HBS (bearing steel ball), the enterprise is N/mm2 (MPa).
Its calculation method is:
In the formula: F——the experimental force pressed into the surface of the metal material sample, N;
D——diameter of the bearing steel ball used for the test, mm;
d——The average diameter of embossing, mm.
It is more reliable to measure the tensile strength, but generally HBS is only suitable for metal composite materials below 450N/mm2 (MPa), not suitable for hard weathering steel plates. In steel pipe standards, tensile strength is primarily used for a wide range of applications. The strength of the raw material is usually expressed by the embossing diameter d, which is both intuitive and convenient.
For example: 120HBS10/1000130: Indicates that the tensile strength value of a bearing steel ball with a diameter of 11mm measured under an experimental force of 1000Kgf (9.807KN) for 30s (seconds) is 120N/mm2 (MPa).
2. Rockwell hardness (HK)
The Rockwell hardness test, like the tensile strength test, is an imprint test. The difference is that it measures the depth of the embossing. That is, under the successive action of the initial test force (Fo) and the total test force (F), the tensile force (gold steel grinding cone or bearing steel ball) is pressed into the surface of the test piece, and the main force is removed after the required maintenance time. For the experimental force, the intensity value was calculated from the measured increase in residual imprint depth (e). Its value is an unnamed number, which is marked with HR to indicate that there are 9 rulers such as A, B, C, D, E, F, G, H, K, etc. in common use. Among them, the commonly used rulers used in the strength test of weathering steel plates are generally A, B, and C, namely HRA, HRB, and HRC.
The intensity value is calculated by the above formula:
HR=100-e if experiment with A and C scales
If using the B scale experiment, HR=130-e
In the formula, e--remaining imprinting depth increases, even expressed by the requirement of 0.002mm, that is, every deviation of the tensile axis diameter by one enterprise (0.002mm) is equivalent to a change in Rockwell hardness by a number. The larger the e value, the lower the strength of the metal material, and vice versa, the higher the strength.
3. Brinell hardness (HV)
The Brinell hardness test is also an imprint test method, which is to use the selected experimental force (F) to press the square pyramid diamond with the opposite surface intersection angle of 1360° into the experimental surface layer, and remove the experimental force after the required maintenance time. . , measure the length of the two straight lines imprinted.
The Brinell hardness value is the quotient of the experimental force divided by the embossed area. The calculation method is:
In the formula: HV——Brinell hardness symbol, N/mm2 (MPa);
F——Experimental force, N;
d——the arithmetic mean of the two straight lines imprinted, mm.
The experimental force F selected for Brinell hardness is 5 (49.03), 10 (98.07), 20 (196.1), 30 (294.2), 50 (490.3), 100 (980.7) Kgf (N) and other six grades, which can measure the strength value. The range is 5~1000HV.
Q295NH Q355NH ASTM A588 Corten A B Metal weathering Resistant Steel sheet with cold rolled steel coil
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