The minimum tensile strength value under the new capacity standard is greater than 540 MPa
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Have you all noticed that, according to the new TSG 21-2016 regulations, provisions such as those regarding \"the minimum standard tensile strength being greater than 540 MPa…\" have been changed to state \"greater than 540 MPa\" instead of \"greater than or equal to 540 MPa\"? What is the reason for such a change? Why was equality removed? Could it be related to the tensile strength of Q370R?
Isn’t the minimum standard tensile strength value for Q370R less than 540? It can’t be that reason, right?
I’m not sure. The standard specifies 530 for Q370R, but that is the minimum value; do some steel mills typically achieve 540 when producing this material? This is just a guess on my part; I’m not sure what the editor had in mind
The tolerance specification also refers to the “lower limit”. I think Shou Bi Nan mentioned this during the Training Committee sessions; actually, the figure of 540 is also arbitrary and has no particular scientific basis. The higher the tensile strength, the worse the toughness of the material, but there is no specific boundary; rather, a definite value must be specified when formulating standards. Now the fixed capacity specification has been changed to greater than 540. I think, in cases where the value is equal to 540, designers should still follow the requirement of using a value greater than 540 as a precaution
Probably, there is no material that exactly equals 540 MPa.