Introduction of hardness of weather resistant steel plate

The construction industry can not live without stainless steel plate, in order to better grasp the stainless steel plate at a deeper level, I will explain the weathering steel plate. The weathering steel plate can be divided into tensile strength, Rockwell hardness, Brinell hardness, Shore hardness, microscope strength and high temperature strength. There are generally common Brinell, Rockwell, Brinell hardness three.
1. Tensile Strength (HB)
Use a bearing steel ball or carbide cutter ball of a certain diameter to press the required experimental force (F) into the surface of the style, remove the experimental force after the required maintenance time, and measure the imprint diameter (L) of the surface of the specimen. The tensile strength value is the quotient of the experimental force divided by the individual's impression sphere area. According to HBS(bearing steel ball), the enterprise is N/mm2(MPa).
The calculation method is as follows:
Where: F-- experimental force pressed into the surface of the metal material specimen, N;
D-- bearing steel ball diameter for experiment, mm;

d-- mean diameter of impression, mm.

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The measurement of tensile strength is more reliable, but generally HBS is only suitable for the metal composite materials below 450N/mm2(MPa), and it is not suitable for the hard weathering steel plate. In the steel pipe standard, the tensile strength is mainly used in a wide range of applications, usually to imprint diameter d to indicate the strength of the raw material, which is both visual and convenient.
For example, 120HBS10/1000130: indicates that the tensile strength value 120N/mm2(MPa) measured by maintaining 30s(seconds) with a diameter of 11mm bearing steel ball under the experimental force effect of 1000Kgf(9.807KN) is 120n /mm2.
2, Rockwell hardness (HK)
The Rockwell hardness test, like the tensile strength test, is all imprinting test. The difference is that it measures the depth of the impression. That is, under the sequential effect of the experimental force (Fo) and the total experimental force (F), the tensile force (cone or bearing steel ball) is pressed into the surface of the specimen, and after the required maintenance time, the main experimental force is removed, and the strength value is measured by the measured increase in the depth of the residual impression (e). Its value is an anonymous number, with the mark HR to indicate that the commonly used ruler is marked with A, B, C, D, E, F, G, H, K and other 9 ruler marks. The scale commonly used in the strength experiment of weather-resistant steel plates is generally A, B, C, namely HRA, HRB, HRC.
Strength value is calculated using the above formula:
When using A and C scales, HR=100-e
If we use the B-scale, HR=130-e

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Where e is the increase in the depth of the residual imprint, and its system is to require the enterprise 0.002 mm, that is, when the tensile shaft diameter is offset by an enterprise (0.002 mm), it is equivalent to the Rockwell hardness transformation of a number. The greater the e value, the lower the strength of the metal material, and the higher the strength.
3, Brinell hardness (HV)
Brinell hardness test is also a kind of imprinting experiment, is a relative surface Angle of 1360 positive tetrapyramid diamond pull to select the experimental force (F) pressed into the experimental surface, after the required maintenance time to remove the experimental force, measuring the length of the imprinting two straight lines.
Brinell hardness value is the experimental force divided by the imprint area of the individual income, it is calculated as:
Where: HV-- Brinell hardness mark, N/mm2(MPa);
F-- experimental force, N;
d-- The arithmetic mean of the two lines imprinted,mm.
The experimental force F of 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 levels, and the range of strength values can be measured is 5~1000HV.
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