JIS G3456

JIS G3456 is a Japanese Industrial Standard that specifies carbon steel pipes for high-temperature service.

JIS G3456 carbon steel pipes are essential for high-pressure and high-temperature applications across several industries, particularly in power generation and chemical processing. Understanding the specifications and characteristics of these pipes is crucial for ensuring compliance and performance in demanding environments.

JIS G3456 standard was prepared based on ISO 9329-2:1997 and ISO 9330-2:1997 with some modifications of the technical requirements.

JIS G3456 applies to carbon steel pipes mainly used for piping at temperatures above 350℃. The pipes are available in various grades, including STPT370, STPT410, and STPT480, which have minimum yield strengths of 215 MPa, 245 MPa, and 315 MPa, respectively. The pipes can be manufactured using either a seamless or welded process.

The JIS G3456 standard was last updated in 2019 (JIS G3456:2019). The standard is protected by copyright and the full text can be accessed through the official website of the Japanese Standards Association.

Purpose

JIS G3456 specifies requirements for carbon steel pipes intended for high-temperature and high-pressure applications, such as in power generation and related industries.

Grades

The standard includes several grades of carbon steel pipes, commonly designated as:

Each grade has specific mechanical and chemical composition requirements.

Mechanical Properties

Dimensions

Pipes are available in various dimensions, including different diameters and wall thicknesses, to meet the specifications outlined in the standard.

Applications

JIS G3456 carbon steel pipes are widely used in industries requiring high-pressure piping solutions, including:

Manufacturing Process

Pipes can be manufactured through seamless or welded processes, depending on the application requirements.

Testing Requirements

Pipes are subjected to rigorous testing to ensure integrity and performance:

Advantages of JIS G3456 Carbon Steel Pipes

Chemical Compositions(%) of JIS G3456

Standard Grade C Si Mn P S
JIS G3456 STPT370 ≤0.25 0.10-0.35 0.30-0.90 ≤0.035 ≤0.035
STPT410 ≤0.30 0.10-0.35 0.30-1.00 ≤0.035 ≤0.035
STPT480 ≤0.33 0.10-0.35 0.30-1.00 ≤0.035 ≤0.035

Mechanical properties

Standard Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
JIS G3456 STPT370 ≥216 ≥370 ≥30
STPT410 ≥245 ≥410 ≥25
STPT480 ≥275 ≥480 ≥25

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.

JIS G3456 Carbon Steel Pipes Dimensions Tolerance

Division Tolerances on outside diameter Tolerances on wall thickness Tolerance on deviation in wall thickness
Hot finished seamless steel pipe Up to 50 mm 【0.5mm ≤Up to 4 mm
【0.5mm
Up to and incl. 20 % of
wall thickness
50mm and over, up to 160mm
【1%
160mm and over, up to 200mm
【1.6mm
≤4mm and over
【12.5%
200mm and over 【0.8%
However, for pipes 350mm and over in diameter, the length of circumference may
substitute as a basis for tolerances, In this case, the tolerances shall be 【0.5%.
Cold finished seamless steel
pipe
Up to 40mm 【0.3mm ≤Up to 2 mm
【0.2mm
-
40mm and over 【0.8% ≤2mm and over
【10%
However, for pipes 350mm and over in diameter, the length of circumference may
substitute as a basis for tolerances. In this case, the tolerances shall be 【0.5%

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

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