Steel Hardness and the Breaking Strength
Structural steel S235 HB 100...125
1.0 - 1.03 - 1.06 - 1.12 - 1.25 - 1.618 - 2.0 ...
Calculation use the steel intermediate hardness HB 112 kN/cm2 of steel grade S235. This corresponds to the ratio 1.12. In general, structural steels have hardness variation, even in same grade. Hardness is measured by pressing the agreed form of hard piece onto the steel surface. By measuring the born mark, is known the hardness of the steel.
Steel is manufactured in different kind of processes. Between different steel grades, the strength variates, which can express as hardness. It has been adapted that the certain level the strength of the steel does not get fall short anywhere in the conditions. This kind of steel can be used to reliable strength calculations. The calculation takes the knowledge of steel characteristics to the next level. This unintentionally, that the calculations are more accurate than the other way. The calculation criticizes only reliable and accurate calculations, which were later to say, oops.
Breaking strength formulation
HV HB Breaking strength N/mm2
105 99.8 335 value 335 N/mm2
110 105 350
115 109 370
135 128 430 1.25 x 335 x 1.03 = 431 N/mm2
160 152 510
190 181 510
210 199 675_____1.253 x 335 x 1.03 = 674 N/mm2
1.253= 2 and 199 / 99.8 = 2
1 1 2 3
1.25 = 1 1.253= 1.25 - 1.6 - 2.0
128 - 152 - 199 (HB)
The hardness of steel is not a coincidence. By knowing the hardness of steel, this can lead to values. Having become acquainted with the calculation, we calculate from these data, allowed tension values to load cases. We can also estimate the used material and the required size of profile. (932)
21.12.2014*10:32 (932 - 743
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