X52 generally has a carbon content of no more than 0.26% (welded) or 0.28% (seamless), a manganese content of about 1.40%, and contains appropriate amounts of silicon, phosphorus, sulfur, etc.; X80 has a carbon content of no more than 0.26%, a manganese content of up to about 2.10%, and contains micro-alloy elements such as niobium, vanadium, and titanium to enhance performance.
X52 has a minimum yield strength of about 360MPa and a tensile strength of about 460MPa; X80 has a minimum yield strength of up to 555MPa and a tensile strength of about 625MPa. X80 has an obvious strength advantage and can withstand higher pressure and tension.
X52 is commonly used for medium and low pressure transportation of petroleum and natural gas, such as oil and gas field gathering and transportation pipelines, ordinary chemical pipelines, and urban gas pipelines; X80 focuses on high-pressure, large-diameter, long-distance oil and gas transportation trunk lines, such as cross-regional natural gas transportation and deep-sea oil and gas mining and other high-pressure environment projects.
X52 has a lower cost due to its simple chemistry and production process; X80 has a higher cost due to its complex chemical composition and strict production process.
In terms of impact resistance, X52 has good impact resistance at room temperature, but its performance is limited under low temperature or high impact load conditions; X80 has good impact resistance and can still maintain high toughness at low temperatures, which can adapt to pipeline operation under various complex climatic conditions.
API 5L X80 seamless pipe
