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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.
Standard: JIS G3464
Grade: STBL 380
Type: Seamless alloy steel pipe
Application: Heat exchanger and condenser tubes for low-temperature service
Dimensions: As per JIS G3464 (outside diameter, wall thickness, and length can be customized)
| 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 | — | — | — | — |
| 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 | — |
Excellent toughness at sub-zero and cryogenic temperatures
Stable mechanical strength and ductility
High resistance to brittle fracture
Superior weldability and fabricability
Reliable performance in demanding heat exchanger and condenser service
JIS: JIS G3464 (STBL grades)
ASTM: A333 / A334 low temperature service seamless tubes
EN: EN 10216-4 alloy tube grades for low temperature use
GOST: Low temperature alloy seamless pipe equivalents
GB (China): GB 5310 / GB 9948 adapted for low temperature alloy service
STBL 380 seamless tubes are widely used in industries requiring reliable operation under cryogenic or low-temperature service conditions:
Petrochemical industry: Heat exchangers, condensers, and coolers handling cryogenic fluids
Energy & Power plants: LNG terminals, low-temperature boilers, and condensers
Chemical processing: Cryogenic storage systems, ammonia plants, and refrigerant exchangers
Shipbuilding & Offshore: Low-temperature piping systems in LNG carriers
Pressure vessels: Cold service heat transfer equipment
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.