A question about bolts and nuts! !
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I would like to ask the experts: On page P84 of JB/T4707-2000, under section 10.3, it is stated that for 35CrMoA studs to be used in temperatures below -20 degrees, the matching nut material should also be 35CrMoA; furthermore, after marking the end of the stud, the letter ‘D’ should be printed there as well. ” Regarding the above regulations, I would like to ask whether it is mandatory to do this for low-temperature pressure vessels! Can a combination of 35CrMoA/30CrMo be used? If not, in what situations would the combination of 35CrMoA/30CrMo be suitable for use? ! Thank you! ! !
It can be used at low temperatures, but it is required to pass impact tests in order to be used!
35CrMoA/30CrMo are Ministry of Chemicals standards. For the 35CrMoA stud material, the specified nut material is also 35CrMoA, in accordance with petrochemical standards. Which standard are you using? Personal opinion. . It can be discussed, thank you