Project Background
Our customer is a leading United‑States‑based manufacturer of high‑purity chemical‑processing and pharmaceutical production equipment. The project required high‑specification ASTM B622 UNS N10276 Hastelloy C276 seamless tubes for ultra‑clean pharmaceutical reactor systems. These tubes must resist highly corrosive process media under elevated operating temperature, while maintaining strict surface roughness to avoid product contamination and support clean‑in‑place (CIP) cleaning workflows.
The project faced a critical schedule risk: existing US and European alloy suppliers quoted 16‑20‑week lead times and could not satisfy the tight 20‑calendar‑day delivery target, which threatened the client's whole production roll‑out timeline.
Critical Requirements
| Requirement | Specification |
|---|---|
| Material | Hastelloy C276 (UNS N10276), ASTM B622 |
| Dimensions | OD 76.2 mm (3.000″) × ID 63.5 mm (2.500″) – Wall thickness 6.35 mm |
| Length | 6,000 mm per piece, 12 pieces total |
| Internal Surface Finish | Electropolished to Ra ≤ 0.4 µm (16 µin) with mirror finish |
| External Surface | Mechanically polished to Ra ≤ 0.8 µm |
| NDT Requirements | 100% Ultrasonic Testing (UT) + Hydrostatic Testing |
| Delivery Deadline | 20 calendar days from order confirmation |
| Certification | Full EN 10204 Type 3.1 MTC with chemical, mechanical, and corrosion test reports |
The Challenge
The critical challenge was time.
The customer's production schedule was at risk. Their regular US and European suppliers could not deliver within the required 20‑day window:
| Supplier | Quoted Lead Time | Status |
|---|---|---|
| US Supplier A | 16–18 weeks | Could not meet deadline |
| European Supplier B | 18–20 weeks | Could not meet deadline |
| HSMetal | 20 days | Delivered on time |
Beyond the timeline, the technical requirements were exceptionally demanding:
- Internal mirror finish (Ra ≤ 0.4 µm) along the entire 6‑meter tube length
- Uniform electropolishing without over‑polishing or pitting
- Full NDT compliance – 100% ultrasonic testing per ASTM E213
- Intergranular corrosion testing per ASTM G28 A
HSMetal Fast‑Track Manufacturing & Quality Solution
Upon order confirmation, our technical, stock and production teams launched fast‑track execution to beat the standard mill lead‑time bottlenecks:
Raw‑material preparation: Qualified in‑warehouse stock fully matching ASTM B622 and UNS N10276 chemical‑composition requirements was selected, skipping long‑mill‑order cycles.
Seamless tube production: Precision tube manufacturing with tight dimensional tolerances for wall thickness, outer and inner diameter.
Internal proprietary electropolishing: Specially‑optimized EP process achieved Ra ≤ 0.3 µm, exceeding the customer's Ra 0.4 µm requirement, with consistent mirror‑finish surface quality over the full 6‑meter tube length.
External mechanical polishing: Finished outer surface reaching Ra ≤ 0.6 µm.
Full‑scope non‑destructive testing:
- 100% Ultrasonic Testing according to ASTM E213
- Hydrostatic test performed at 2 times the component design pressure
Complete certification package: EN 10204 Type 3.1 MTC covering chemical analysis, tensile / yield / elongation values, hardness results, ASTM G28‑A intergranular‑corrosion test, and full dimensional inspection records.
UNS N10276 Hastelloy C276 Polished Tube Production Status
Project Result
| Requirement | Specification | HSMetal Result | Status |
|---|---|---|---|
| Internal Surface Finish | Ra ≤ 0.4 µm | Ra ≤ 0.3 µm | Exceeded |
| External Surface Finish | Ra ≤ 0.8 µm | Ra ≤ 0.6 µm | Exceeded |
| Dimensional Accuracy | OD 76.2mm / ID 63.5mm | Within tolerance | Passed |
| Ultrasonic Testing | 100% per ASTM E213 | 100% passed | Passed |
| Hydrostatic Testing | 2× design pressure | 100% passed | Passed |
| Intergranular Corrosion | ASTM G28 A | Passed | Passed |
| Delivery Timeline | 20 calendar days | 20 days | On time |
About Hastelloy C276
Hastelloy C276 (UNS N10276) is a nickel‑molybdenum‑chromium superalloy with outstanding corrosion resistance in a wide range of aggressive media. It is particularly effective against:
- Pitting and crevice corrosion
- Stress corrosion cracking
- Oxidizing and reducing environments
- High‑temperature corrosion
UNS N10276 has excellent resistance to both oxidizing and reducing media, and to mixed acid and chloride environments. Its very low carbon and silicon content ensures excellent resistance to intergranular corrosion in the welded heat‑affected zone, making it widely used in the chemical, petrochemical, and pharmaceutical industries.
Typical applications include: chemical reactors, heat exchangers, flue gas desulfurization systems, pharmaceutical equipment, and offshore oil & gas components.
Why Choose HSMetal for Hastelloy & Nickel‑Alloy Tubing
- In‑house stock of key nickel‑base alloys including Hastelloy C276, C22, Inconel series for fast‑track orders
- Support internal electropolishing, mechanical polishing for long‑length seamless tubes for pharma / chemical processing service
- Complete NDT capability: UT, hydrostatic test, PMI positive material identification
- Full‑traceable documentation: EN 10204 Type 3.1 / 3.2 mill test certificates
- Rich export experience serving US, European and global high‑end chemical‑equipment clients
If you have inquiries for ASTM B622 Hastelloy C276 or other nickel‑alloy seamless tubes with polishing and strict NDT requirements, please send over your specifications or drawings for quotation.
Contact Us For Sample And Quotation
FAQ
Q1: What is Hastelloy C276 (UNS N10276)?
A: Hastelloy C276 is a nickel‑molybdenum‑chromium superalloy known for outstanding corrosion resistance in aggressive environments. It offers excellent resistance to pitting, crevice corrosion, stress corrosion cracking, and high‑temperature oxidation. Its low carbon and silicon content also ensures resistance to intergranular corrosion in welded heat‑affected zones.
Q2: Why choose internal electropolishing for tubing?
A: Internal electropolishing creates a smooth, mirror‑like surface (Ra ≤ 0.3–0.4 µm) that reduces friction, prevents product contamination, resists bacterial adhesion, and facilitates clean‑in‑place (CIP) procedures – making it essential for pharmaceutical, biotech, and ultra‑clean chemical processing applications.
Q3: What surface finish can you achieve for long‑length Hastelloy C276 seamless tube?
A: Our proprietary internal electropolishing process can reach Ra ≤ 0.3 µm mirror finish for 6‑meter long tubes, satisfying strict pharmaceutical CIP clean‑in‑place requirements. External mechanical polishing can reach Ra ≤ 0.6 µm‑0.8 µm according to order requirements.
Q4: How did you deliver in 20 days when others quoted 16–20 weeks?
A: We mobilized immediately upon order confirmation. Our in‑house stock material matched the exact ASTM B622 specifications, eliminating typical mill lead times. Combined with our seamless tube production and proprietary electropolishing capabilities, we bypassed the long supply chain delays of US and European mills.
Q5: What NDT tests were done for this US‑customer Hastelloy C276 order?
A: Every tube underwent 100% Ultrasonic Testing per ASTM E213 plus hydrostatic testing at 2× design pressure. PMI positive material identification can also be added upon client request.
Q6: What industries use Hastelloy C276 electropolished tubes?
A: Pharmaceutical reactor systems, biotech fermentation equipment, chemical processing (aggressive media handling), semiconductor high‑purity gas lines, and offshore oil & gas components requiring corrosion resistance and ultra‑clean internal surfaces.
Q7: Do you offer custom tube sizes?
A: Yes. We supply standard and custom sizes per ASTM B622 and other relevant standards (e.g., ASTM B619 welded pipe, ASTM B626 welded tube). Please contact us with your dimensional requirements.
Q8: What standard applies for this batch of Hastelloy C276 seamless tubes?
A: These seamless tubes comply with ASTM B622, UNS N10276 (Hastelloy C276) for nickel‑alloy seamless tubing, for pharmaceutical reactor high‑purity corrosive‑media service.
Q9: What certification documents are supplied with Hastelloy alloy shipments?
A: We provide EN 10204 Type 3.1 mill‑test‑certificates including chemical analysis, mechanical‑property data, intergranular‑corrosion test (ASTM G28‑A), dimensional‑inspection and NDT test reports. EN 10204 Type 3.2 third‑party inspection certificates are available on request.
Q10: Can you deliver Hastelloy C276 tubing within short lead‑time for urgent US / EU projects?
A: Yes. We maintain qualified raw‑material stock for mainstream Hastelloy grades. For eligible specifications we support fast‑track production to drastically shorten lead‑time compared with primary mill lead‑times.
Q11: What is the Minimum Order Quantity (MOQ)?
A: Normally MOQ is 50kg, We always expect more opportunities with you. But for some special material or special size let's communicate the actual status.
Q12: What payment terms do you accept?
A: We accept T/T, L/C, and other common methods. For new customers, we usually require 50% deposit and 50% balance before shipment. Flexible terms can be negotiated for long-term partners
Q13: What if I find quality issues after receiving the goods?
A: We provide a 100% quality guarantee. If any non-conformity is found, please provide photos and test data within 7 working days of receipt. We will respond within 48 hours and agree on replacement, return, or compensation terms.
