When planning to submit materials, how should the material type of bolts be chosen?
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Studs/nuts HG/T 20634: Fully threaded studs with 2 thick hex head nuts (Type II, m=1.0d); materials 35CrMoA/30CrMo, standards GB/T3077/GB/T3077. Studs/nuts HG/T 20634: Fully threaded studs with 2 thick hex head nuts (Type II, m=1.0d); materials 25Cr2MoVA/35CrMoA, standards GB/T3077/GB/T3077. These are the plans they proposed. What determines the use of 25Cr2MoVA/35CrMoA in this case? Are there any standard regulations for this?
According to HG/T 20634, the suitable fastener material combination should be 25Cr2MoV/30CrMo
There are various types of fastener standards: DIN German standard, GB Chinese standard, ASME/IFI/ANSI American standard, Q automotive standard, PEM standard, JB standard issued by the Ministry of Machinery, EN European standard, ISO international standard, JIS Japanese standard, HG chemical industry standard, NFE French standard, UNI Italian standard, BS British standard, and other commonly used standards. Depending on the applicable standard, the corresponding requirements under GB can be selected.
Generally, it is a material combination specified in the design, with the designer selecting materials in accordance with relevant standards
Based on the difference in strength and hardness. For more information, follow the official account “Chemical Equipment Innovation Base””
The selection is based on the material; for 20634, it is 25Cr2MoV/30CrMo. Our company mainly produces fully threaded studs and nuts for use in the chemical industry. Phone number: 15175078871. We look forward to your call