The main reasons for the cracking of the stainless steel seamless pipe after welding include the following aspects:
Material composition and properties: The high carbon content in the stainless steel seamless pipe will make the pipe hard and difficult to weld, and cracking may occur after welding. In addition, the improper proportion of alloy elements may also affect the performance of the pipe and cause cracking.
Welding and processing process:
Improper selection of welding materials: Using incorrect welding materials for welding may cause the weld to creep under the combined action of high temperature and load, thereby causing cracking.
Welding quality: Failure to remove contamination from the welding interface during welding, or improper welding speed, may cause the weld to crack.
Work hardening: During the cold working process, the 304 stainless steel water pipe will harden and induce martensite structure, which is very brittle. Easy to crack
External factors:
Stress corrosion: Stress corrosion cracking may occur under the combined action of specific corrosive media (such as chloride ions) and stress (such as welding residual stress)
Over-grinding: Over-grinding of stainless steel welds may damage the surface of the pipe, reduce its corrosion resistance, and thus cause cracking
Poor quality raw materials: Using inferior stainless steel raw materials to make pipes may cause the pipes to crack during processing and use
Other factors:
Pipe quality: The quality of the pipe directly affects its crack resistance. Stainless steel water pipes produced from refining furnace steel strips have good ductility, less impurities, and better crack resistance; while pipes produced from medium frequency furnace materials (recycled steel strips) may be prone to cracking due to more impurities and high carbon content
Use environment: The environmental conditions during the use of the pipe (such as temperature, humidity, corrosive media, etc.) will also affect its crack resistance
