• 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

How many categories does the shipbuilding steel are divided?

The general intensity hull structural steel is divided into A,B,C,D four levels,all of their yield strength is no less than 235 MPa and their tensile strength is 400-520 Mpa,but their impact energy is different which is under the differ temperature. The high intensity hull structural steel divides its intensity level is according to the minimum yield strength, and every intensity level is divided into A,D,E,F levels which is based on the different impact toughness.