Can bolts made of 25Cr2MoVA material be used in environments at -30 degrees?
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The standard specifies that the minimum operating temperature for bolts made of 25Cr2MoVA material is -20 degrees Celsius. Is it possible to add an impact test at -30 degrees Celsius for use in environments at that temperature? (Are there any relevant standards that mention it or has it been used in engineering?)
It’s not specified in this standard; all values are above -20°C. If it is to be used, procedures similar to those for new product evaluation are required, which is quite troublesome. Why must 25Cr2MoV be used? Is it because the strength requirements cannot be met with another material?
No, why not choose 35CrMoA?
It is mainly used in high-temperature environments, but low temperatures may also occur
The allowable stress for 35CRMoA is lower. For the studs specified in the low-temperature impact tests at 150 degrees, the specification is “=M56”, but using M105 also presents problems