JIS G3464 STBL 380 Low Temperature Heat Exchanger Tubes Alloy Steel Seamless Pipe
JIS G3464 STBL 380 Low Temperature Heat Exchanger Tubes Alloy Steel Seamless Pipe
Material
STBL 380 is a low-temperature alloy steel grade defined under JIS G3464, specifically developed for seamless steel tubes used in heat exchangers, condensers, and similar equipment operating at low temperatures. These tubes offer high toughness, good impact resistance, and reliable performance in cryogenic and sub-zero service conditions.
Specifications
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Standard: JIS G3464
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Grade: STBL 380
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Type: Seamless alloy steel pipe
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Application: Heat exchanger and condenser tubes for low-temperature service
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Dimensions: As per JIS G3464 (outside diameter, wall thickness, and length can be customized)
Chemical Composition (Typical, wt%)
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Ni (%) | Cr (%) | Mo (%) | Others |
|---|---|---|---|---|---|---|---|---|---|
| JIS STBL 380 | ≤0.15 | 0.10–0.35 | 0.30–0.60 | ≤0.025 | ≤0.025 | 2.5–3.5 | 0.40–0.80 | 0.25–0.35 | — |
| ASTM A333 Gr. 3 | ≤0.19 | ≤0.25 | 0.31–0.64 | ≤0.025 | ≤0.025 | 3.18–3.82 | 0.44–0.65 | 0.44–0.65 | — |
| ASTM A333 Gr. 4 | ≤0.12 | ≤0.30 | 0.50–1.00 | ≤0.025 | ≤0.025 | 1.25–1.75 | 0.50–0.80 | 0.44–0.65 | — |
| EN 10216-4 15NiCuMoNb5-6-4 | ≤0.12 | ≤0.50 | 0.40–0.70 | ≤0.025 | ≤0.015 | 2.70–3.20 | 0.50–0.80 | 0.35–0.55 | Nb 0.10–0.20 |
| GOST 4543 09Mn2Si | ≤0.12 | 0.17–0.37 | 1.20–1.60 | ≤0.025 | ≤0.025 | — | — | — | — |
Mechanical Properties (Typical Values)
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Test (J, –196°C) | Hardness (HB) |
|---|---|---|---|---|---|
| JIS STBL 380 | ≥520 | ≥380 | ≥22 | ≥27 | ≤170 |
| ASTM A333 Gr. 3 | 470–650 | ≥240 | ≥30 | ≥27 | — |
| ASTM A333 Gr. 4 | 550–705 | ≥345 | ≥20 | ≥27 | — |
| EN 10216-4 15NiCuMoNb5-6-4 | 490–650 | ≥355 | ≥22 | ≥27 | — |
| GOST 4543 09Mn2Si | 470–640 | ≥335 | ≥20 | ≥27 | — |
Key Features
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Excellent toughness at sub-zero and cryogenic temperatures
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Stable mechanical strength and ductility
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High resistance to brittle fracture
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Superior weldability and fabricability
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Reliable performance in demanding heat exchanger and condenser service
Applicable Standards
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JIS: JIS G3464 (STBL grades)
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ASTM: A333 / A334 low temperature service seamless tubes
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EN: EN 10216-4 alloy tube grades for low temperature use
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GOST: Low temperature alloy seamless pipe equivalents
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GB (China): GB 5310 / GB 9948 adapted for low temperature alloy service
Application Fields
STBL 380 seamless tubes are widely used in industries requiring reliable operation under cryogenic or low-temperature service conditions:
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Petrochemical industry: Heat exchangers, condensers, and coolers handling cryogenic fluids
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Energy & Power plants: LNG terminals, low-temperature boilers, and condensers
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Chemical processing: Cryogenic storage systems, ammonia plants, and refrigerant exchangers
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Shipbuilding & Offshore: Low-temperature piping systems in LNG carriers
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Pressure vessels: Cold service heat transfer equipment
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