[Discussion Thread 8] Can the tensile strength of stainless steel be roughly determined by comparing two tables? Everyone, come and participate!
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This post was last edited by kareale88 on 2019-1-20 at 21:50: bg4.png【Discussion Thread 8】Can the tensile strength of stainless steel be roughly determined by comparing the two tables in 【the first two charts】, namely GB150-2011? Doubt 1: Why are the tensile strength and yield strength of high-alloy steel at room temperature not listed in Table 5 of GB150.2, section 4.2 on high-alloy steel plates? Second doubt: Why is the high-temperature yield strength of high-alloy steel plates also shown in Appendix B of GB150.2, namely [Table B.2]?
bg4.pngHG/T20581-2011 does have a formula for division. Regarding fasteners——
The allowable stress is selected after various calculations. Determining the allowable stress solely based on Rp0.2 is one-sided.
The allowable stress tables for stainless steel materials do not provide values for the tensile strength and yield strength at room temperature. The determination of the allowable stress for high-alloy steels differs from that for carbon steels and low-alloy steels.
Do you have any evidence or literature that specifies the tensile strength of stainless steel?
The determination of the allowable stress for high-alloy steels does not take the tensile strength into account.
Is it possible that when testing stainless steel for tensile strength, the results are not significant and the data shows no pattern?
Generally, stainless steels, especially austenitic stainless steels, have a low yield strength-to-tensile strength ratio and high plasticity; typically, the allowable stress is determined by the yield strength rather than the tensile strength
I forgot who said it, but the hardening process of high-alloy steel is relatively complex; its tensile strength doesn’t increase in such a noticeable way as that of carbon steel
High-alloy steels have good toughness; they exhibit significant plastic flow when used as tensile test specimens, so it should be difficult to determine their tensile strength values
There has never been a situation in which the tensile strength value could not be determined. On the stress-strain curve, the yield strength of ordinary alloy steels is not clearly visible; that’s why national standards specify Rp0.2, while API standards also use Rt0.5 – these two values are used as indicators of yield strength. However, determining these two values requires the use of a extensometer. Furthermore, I agree to some extent with the view that at high temperatures, the allowable stress is no longer determined by the tensile strength; hence it is not included in the standards.