JIS G3461 Standard Boilers and Heat Exchangers

JIS G3461 Standard Boilers and Heat Exchangers

Carbon steel pipes conforming to JIS G3461 are primarily utilized for heat exchange applications both internally and externally within piping systems. These pipes are commonly found in components like water pipes, flue gas conduits, superheater tubes, and air preheaters. Their typical applications span across boiler tubing, heat exchanger components, and condenser assemblies. While they find utility in sectors such as chemicals and petroleum, these materials are not recommended for use in environments involving extremely low temperatures.

Chemical Composition:

Grade Manufacturing Process Chemical Composition (%)
C Si Mn P S Ni Cr Mo Others
STB35 Seamless or Electric Resistance Welded (S, E) ≤0.18 ≤0.35 0.30-0.60 ≤0.035 ≤0.035 - - -
STB42 Seamless or Electric Resistance Welded (S, E) ≤0.32 ≤0.35 0.30-0.60 ≤0.035 ≤0.035 - - -
STB52 Seamless or Electric Resistance Welded (S, E) ≤0.25 ≤0.35 1.00-1.50 ≤0.035 ≤0.035 - - -

Mechanical Properties:

Class Symbol Tensile Strength (N/mm²) {kgf/mm²} Yield Point or Proof Stress (N/mm²) {kgf/mm²} Elongation (%)
Outer Diameter ≥20mm 10mm ≤ Outer Diameter <20mm Outer Diameter <10mm
No. 11 Test Piece No. 12 Test Piece No. 11 Test Piece
STB340
STB410
STB510		 ≥340{35}
≥410{42}
≥510{52}		 ≥175{18}
≥255{26}
≥295{30}		 ≥35
≥25
≥25		 ≥30
≥20
≥20		 ≥27
≥17
≥17

Manufacturing Methods:

Class Symbol Heat Treatment
Hot Finished Seamless Steel Tube Cold Finished Seamless Steel Tube Electric Resistance Welded Steel Tube (Other than Hot Finished or Cold Finished) Finished Electric Resistance Welded Steel Tube Fold Finished Electric Resistance Welded Steel Tube
STB 340 As Manufactured; Low Temperature Annealing or Normalizing may be performed if required. Low Temperature Annealing, Normalizing, or Full Annealing. Normalizing. As Manufactured; Low Temperature Annealing or Normalizing may be performed if required. Normalizing.
STB 410 As Manufactured; Low Temperature Annealing or Normalizing may be performed if required. Low Temperature Annealing, Normalizing, or Full Annealing. Normalizing. Low Temperature Annealing.
STB 510 Normalizing.
In practical applications, these pipes are integral in ensuring efficient thermal exchanges while maintaining structural integrity under varying operational conditions. The diverse manufacturing processes allow for tailored solutions depending on specific engineering requirements, making these materials versatile across multiple industrial domains.

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