GB/T9948 Standard Seamless Steel Pipe Supplier

Standard Grades of GB/T 9948 Seamless Steel Pipes

GB/T 9948 specifies standard grades for seamless steel pipes used in the petroleum industry, including Grade 10, Grade 20, and alloy grades like 15CrMo and 1Cr5Mo. These grades are designed to meet different requirements for strength, corrosion resistance, and high-temperature performance.

Material Grades of GB/T 9948 Seamless Steel Pipes

The material grades under GB/T 9948 include carbon steel grades such as 10 and 20, and alloy steel grades like 15CrMo and 1Cr5Mo. These materials are chosen based on their ability to withstand high temperatures and pressures, and their resistance to corrosion in harsh environments.

Chemical Composition of GB/T 9948 Seamless Steel Pipes

The chemical composition varies by grade. For example, Grade 20 contains 0.17-0.24% carbon, 0.17-0.37% silicon, and 0.35-0.65% manganese. Alloy grades like 15CrMo contain additional elements such as chromium and molybdenum to enhance high-temperature strength and corrosion resistance.

Mechanical Properties of GB/T 9948 Seamless Steel Pipes

Grade 20 has a tensile strength of 410-550 MPa and a yield strength of at least 245 MPa, with an elongation of at least 21%. Alloy grades like 15CrMo have higher tensile strengths and yield strengths, and are delivered in normalized or tempered conditions to ensure optimal performance in high-temperature applications.

Advantages of GB/T 9948 Seamless Steel Pipes

GB/T 9948 seamless steel pipes offer high strength and toughness, making them durable under harsh conditions. They have good corrosion resistance, crucial for stability in high-temperature, high-pressure, and hydrogen environments. The seamless construction ensures no weak points and a consistent material structure. These pipes also have a long service life with minimal maintenance, reducing downtime and replacement costs.

Applications of GB/T 9948 Seamless Steel Pipes

GB/T 9948 seamless steel pipes are extensively used in the petrochemical industry, particularly in petroleum cracking units where they withstand extreme conditions to ensure stable fluid transport. They are also used in natural gas transportation, marine engineering, mining, boilers, heat exchangers, and the chemical and electric power industries.