JIS G3461 Seamless Pipe Manufacturer

JIS G3461 is a Japanese industrial standard for seamless steel pipes used in boiler and heat exchanger applications, particularly in high-temperature and high-pressure environments. It covers grades like STBA12, STBA13, and STBA20, made from carbon and alloy steels, ensuring excellent strength, oxidation resistance, and durability. These pipes are manufactured through hot or cold forming processes, ensuring precise dimensions and surface quality.

JIS G3461 pipes undergo rigorous testing for mechanical properties, chemical composition, and hydrostatic performance. They are widely used in power plants, refineries, and industrial systems, providing reliable performance under extreme conditions.

Types of JIS G3461 Standard Seamless Steel Pipe

JIS G3461 specifies carbon steel tubes for boilers and heat exchangers. The details of its standard grades, material grades, chemical compositions and mechanical properties are as follows:

Standard and Material Grades

Standard Grades: Tubes are classified under the JIS G3461 standard.

Material Grades: Include STB340, STB410 and STB510.

Chemical Compositions

STB340: Carbon (C) content is ≤0.18%, Silicon (Si) content is ≤0.35%, Manganese (Mn) content is 0.30 - 0.60%, Phosphorus (P) content is ≤0.035% and Sulfur (S) content is ≤0.035%.

STB410: Carbon (C) content is ≤0.32%, Silicon (Si) content is ≤0.35%, Manganese (Mn) content is 0.30 - 0.80%, Phosphorus (P) content is ≤0.035% and Sulfur (S) content is ≤0.035%.

STB510: Carbon (C) content is ≤0.25%, Silicon (Si) content is ≤0.35%, Manganese (Mn) content is 1.00 - 1.50%, Phosphorus (P) content is ≤0.035% and Sulfur (S) content is ≤0.035%.

Mechanical Properties

STB340: The yield strength is ≥175 MPa, the tensile strength is ≥340 MPa, and the elongation is ≥35%. The Rockwell hardness is 77 max.

STB410: The yield strength is ≥255 MPa, the tensile strength is ≥410 MPa, and the elongation is ≥25%. The Rockwell hardness is 79 max.

STB510: The yield strength is ≥295 MPa, the tensile strength is ≥510 MPa, and the elongation is ≥25%. The Rockwell hardness is 92 max.

Advantages of JIS G3461 Seamless Pipes

JIS G3461 seamless pipes offer exceptional strength, durability, and resistance to high temperatures and pressures. Their seamless design ensures structural uniformity, reducing mechanical stress and corrosion risks. The smooth internal surface enhances flow efficiency, making them ideal for high-performance applications in demanding environments.

Applications of JIS G3461 Seamless Pipes

JIS G3461 seamless pipes are widely used in power generation (boiler tubes, superheaters), petrochemicals (corrosive fluid transport), and construction (structural components). Their reliability under extreme conditions makes them essential in industries requiring high strength, corrosion resistance, and longevity.

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