ASTM A199
ASTM A199 - seamless steel tube
Factory supply hot rolled & cold drawn ASTM A334 Gr6 seamless tubes, full chemical & impact test, custom machining, complete MTC certification for cryogenic industrial projects.
ASTM A334/A334M is the universal standard for seamless & welded carbon/alloy tubes for low-temperature service. Grade 6 is carbon steel grade specially engineered for cryogenic and sub-zero medium transport, with strict Charpy V-notch impact test requirement at -45°C to avoid brittle fracture under cold working loads.
ASTM A334 Gr6 seamless tubes are produced via hot piercing or cold drawing process. No welding seam eliminates structural weakness, ensuring stable mechanical performance under alternating low temperature and pressure cycles. Widely applied in cryogenic storage, low temp heat exchangers, power boiler cold side equipment and petrochemical cold medium pipelines.
| Element | Content Range |
|---|---|
| Carbon (C) | Max 0.30 |
| Manganese (Mn) | 0.29 ~ 1.06 |
| Silicon (Si) | Min 0.10 |
| Phosphorus (P) | Max 0.025 |
| Sulfur (S) | Max 0.025 |
| Performance Item | Standard Required Value |
|---|---|
| Minimum Tensile Strength | 415 MPa (60 ksi) |
| Minimum Yield Strength | 240 MPa (35 ksi) |
| Min Elongation (50mm gauge) | 30% |
| Max Hardness | HRB 90 / HB 190 |
| Charpy Impact Test Condition | -45 °C V-notch |
| Minimum Average Impact Energy | 18 J per specimen |
Note: Thick heavy wall tubes may degrade low-temperature toughness, so thin-wall specifications are preferred for deep cryogenic projects.
| Parameter | Specification Scope |
|---|---|
| Outer Diameter | 3.4mm ~ 660mm (1/8" ~ 26") |
| Wall Thickness | 0.4mm ~ 80mm (minimum wall design) |
| Standard Length | 6m / 12m fixed cut, random length up to 30m |
Complete EN 10204 3.1 / 3.2 MTC test report provided for all shipments.
Tubes bundled with steel straps, plastic end caps to avoid collision damage. Anti-rust oil coated inside & outside for long ocean transit. Each bundle marked with ASTM A334 Gr6, heat number, OD/WT, length. Wooden pallet or full container loading available, support EXW / FOB / CIF / DAP trade terms.
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