Hangbo Alloy Group
Shanghai · Est. 2012
Premium seamless tubes manufactured to ASTM/ASME standards for high-pressure, high-temperature, and highly corrosive service. OD 6–813 mm, wall thickness 0.5–50 mm.
Hangbo Alloy Group produces seamless nickel alloy tubes using hot extrusion and cold pilgering processes. Our tubes are engineered for applications requiring exceptional resistance to corrosion, high-temperature oxidation, and thermal fatigue. Each tube is seamless — produced from a solid billet without any longitudinal weld — ensuring uniform wall thickness and superior pressure-bearing capability.
We supply tubes in solution-annealed condition with controlled grain size for optimal corrosion resistance. All tubes are hydrostatically tested to verify structural integrity and leak-tightness. Eddy current and ultrasonic testing are available for critical applications.
| Parameter | Specification |
|---|---|
| Outside Diameter (OD) | 6 mm – 813 mm (1/4" – 32") |
| Wall Thickness (WT) | 0.5 mm – 50 mm |
| Length | Up to 12,000 mm (random or fixed length) |
| OD Tolerance | ±0.5% or ±0.10 mm (whichever is greater) |
| WT Tolerance | ±10% (standard); ±7.5% (precision) |
| End Condition | Plain end / Beveled / Threaded (NPT/BSP) |
| Straightness | ≤ 1.5 mm per 3,000 mm |
| Surface Finish | Pickled / Bright annealed / Polished |
| Tube Forms | Straight / U-bend / Coiled (small OD) |
| U-bend Radius | Minimum 1.5 × OD |
| MOQ | 500 kg (standard); 2,000 kg (custom production) |
| Lead Time | 15–30 days (stock); 45–60 days (production) |
Tubes available in 200+ grades. Custom grades can be produced on request.
| Grade | Ni | Cr | Mo | Fe | W | Cu | Other |
|---|---|---|---|---|---|---|---|
| Inconel 625 | 58 min | 20-23 | 8-10 | 5 max | — | — | Nb+Ta 3.15-4.15, C ≤0.10 |
| Hastelloy C-276 | bal | 14.5-16.5 | 15-17 | 4-7 | 3-4.5 | — | Co 2.5 max, C ≤0.01 |
| Monel 400 | 63-70 | — | — | 2.5 max | — | 28-34 | Mn ≤2.0, C ≤0.30 |
| Incoloy 825 | 38-46 | 19.5-23.5 | 2.5-3.5 | 22 min | — | 1.5-3.0 | Ti 0.6-1.2, C ≤0.05 |
| Inconel 600 | 72 min | 14-17 | — | 6-10 | — | 0.5 max | Si ≤0.5, C ≤0.15 |
| Incoloy 800H | 30-35 | 19-23 | — | 39.5 min | — | 0.75 max | Al+Ti 0.85-1.2, C 0.05-0.10 |
| Nickel 201 | 99.0 min | — | — | 0.40 max | — | 0.25 max | C 0.02 max |
3500T extrusion press for seamless tube production from billet
Precision cold pilger mills for tight tolerance thin-wall tubes
Continuous bright annealing furnace in protective atmosphere
CNC U-bend forming for heat exchanger tube bundles
100% hydrostatic test at specified pressure per ASTM E8
Non-destructive testing for wall integrity and defect detection
| Standard | Scope |
|---|---|
| ASTM B444 | Ni-Cr-Mo (Inconel 625) seamless pipe & tube |
| ASTM B622 | Ni-Mo-Cr (Hastelloy) seamless pipe & tube |
| ASTM B163 | Seamless Ni alloy condenser & heat exchanger tubes |
| ASTM B619 | Ni-Mo-Cr alloy welded pipe |
| ASTM B167 | Ni-Cr-Fe (Inconel 600/601) seamless pipe & tube |
| ASTM B161 | Ni (Nickel 200/201) seamless pipe & tube |
| ASTM B407 | Fe-Ni-Cr (Incoloy 800) seamless pipe & tube |
| ASTM B423 | Ni-Fe-Cr-Mo (Incoloy 825) seamless pipe ⃛ tube |
| ASME SB444 | ASME code case for pressure vessel application |
Seamless tubes are extruded from a solid billet with no longitudinal weld seam, providing uniform strength and superior pressure resistance. Welded tubes are formed from strip and welded along the length. Seamless tubes are preferred for high-pressure, high-temperature, and critical corrosion service where weld integrity is a concern.
Yes. We manufacture U-bend tubes with custom bend radii for shell-and-tube heat exchanger applications. The minimum bend radius is typically 1.5 times the tube OD. U-bend tubes are stress-relieved after forming to minimize residual stresses.
Every tube undergoes hydrostatic testing at 100% of the specified pressure. Additionally, we offer eddy current testing (per ASTM E426), ultrasonic testing (per ASTM E213), and pneumatic testing. Dimensional verification, visual inspection, and surface finish checks are performed on 100% of production.
Yes. We can supply plain ends, beveled ends for welding (per ASME B16.25), threaded ends (NPT or BSP), and grooved ends for mechanical coupling. Custom end caps and protectors are also available for shipping protection.
Provide your grade, OD, wall thickness, length, and quantity. We respond within 10 minutes during business hours.