HOT News

• Improper welding of X80 pipeline may cause cracks
• Brief introduction of API X52 pipeline steel
• The difference between PSL1 and PSL2
• Harm of inclusions in X70 pipeline steel
• API 5L pipeline pipe
• X52 steel plate surface quality standards that need to be met
• The basic production process of API 5L X60 pipeline steel
• The key to Q460D steel welding process
• What does the heat treatment of Q690 Steel include?
• Reasons for choosing Q690D steel

Submarine steel has good low cycle fatigue resistance

Posted:2021-05-28 15:23:25

In addition to the uniform static external pressure determined by the working depth, the submarine sailing underwater has to constantly change the sailing depth in order to adapt to the changeable operational needs. It often submerges or floats. The submarine pressure hull steel has to bear repeated pressure. The pressure cycle caused by the submarine sailing at different depths can shorten the service life of the steel used for submarine pressure hull.

In the corrosive environment, when the stress is relatively high and the repeated stress reaches 80% of the yield point of the material, the material must have a life of more than 5000 cycles. According to the service time of submarine is 15 years, the total anti low cycle fatigue cycle of submarine steel should not be less than 10 million.