Subsequently, in 2000, the British Bureau of Standards published BS7910-1999 Guidelines for Acceptance and Assessment Methods of Defects in Metal Structures, which uses the failure assessment diagram (FAD) based on the principle of fracture mechanics to assess defects in metal structures. According to the test method of BS7448 Part II, the American Petroleum Institute added Appendix A to the standard of API 1104 Pipeline Welding and Related Facilities, and proposed the acceptance standard of pipeline welding joint CTOD value. Det Norske Veritas DNV-OS-401 also puts forward an evaluation and acceptance standard for CTOD value in the acceptance evaluation of engineering projects, so as to carry out engineering evaluation for post weld heat free treatment of large structural parts. CTOD value is actually related to such factors as welding base material, welding wire, flux, welding process, welding method, weld structure size and thickness, and is a comprehensive parameter and performance index of material resistance to cracks.

Less known industrial use of stainless steel pneumatic butterfly valve
1. Electric power engineering has also been applied, and stainless corrugated pipes have also been used for gas turbines, superheaters and other parts of power generation equipment that require high temperature and corrosion resistance. 2. Marine ships are also used. Stainless corrugated pipes are widely used in offshore platforms, ships, submarines and other areas where seawater corrosion resistance is required. Used in automotive engineering.
3. It is used in aerospace. Stainless pneumatic butterfly valves are mainly used for some parts of aircraft turbine initiators that require high temperature resistance and high strength, such as extinguishing chamber, turbine blade, main shaft, exhaust system, etc.
4. For the application in chemical equipment, stainless corrugated pipes are mainly used for parts working in highly corrosive media, such as containers, pipes, valves, pumps, heat exchangers, etc. 5. Stainless pneumatic butterfly valve is mainly used for exhaust installation of automobile starter, such as exhaust valve, spark plug, pipe, exhaust purifier, etc. Do you know if you can also be fooled by the low-key stainless steel pneumatic butterfly valve! Please continue to pay attention to Jintong rubber and plastic products.