Seamless Hastelloy C22 Pipe
Seamless tubing typically conforms to ASTM B622 and ASME SB622 standards.Seamless Hastelloy C22 tubing is a high-performance nickel-chromium-molybdenum-tungsten superalloy pipe renowned for its exceptional resistance to general corrosion,pitting,crevice corrosion,and stress corrosion cracking. Manufactured through extrusion and cold drawing processes,it contains no welded joints.This material is engineered for extreme environments,delivering outstanding resistance to both oxidizing and reducing corrosive agents,often outperforming alloys such as C-276 and 625.
Specification of Seamless Hastelloy C22 Pipe
| Product | Seamless Hastelloy C22 Pipe |
| Working Temperature | 1250°F (677°C) |
| Dimension Range | Outside Diameter (OD): 6 – 200 mm Wall Thickness (THK): 0.35 – 6 mm Length (L): 0.5 – 12 m The size can be customized according to ASME B36.10 / ASME B36.19 |
| Schedules | SCH 5, 10, 40, 80, 160, XXS, XXH |
| Materials | Hastelloy C22 | UNS N06022 | W.Nr. 2.4602 | DIN/EN NiCr21Mo14W |
| Standards | ASTM B622 / ASME SB622 / ASTM B169 / ASME SB169 |
| Surface Finish |
Annealed and Pickled Bright Annealed Mechanically Polished Electropolished |
| Corrosion Resistance Specifications |
Excellent Resistance To: Pitting Corrosion Crevice Corrosion Stress Corrosion Cracking |
| Applications | Pharmaceutical and Biotechnology Industry Chemistry and Petrochemical Engineering Environmental Protection and Pollution Control Energy and Nuclear Industry Food and Personal Care Semiconductors and High-Purity Electronics |
| Our Strength | Over 10 Years Experience Exporting Pipes & Tubings Stock Available In Common Sizes Customized Fabrication Available Package Supplying of Piping Materials Strict QC With PMI Testing For Every Batch Experience in Exporting to the US,Germany,UAE,etc. Third Party Inspection Available |
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Seamless Hastelloy C22 Pipe Chemical Composition (%)
| Ni | Cr | Mo | Fe | W | Co |
| Balance | 20.0 – 22.5 | 12.5 – 14.5 | 2.0 – 6.0 | 2.5 – 3.5 | 0.5 Max |
| Mn | C | Si | P | S | V |
| 0.50 Max | 0.015 Max | 0.08 Max | 0.02 Max | 0.02 Max | 0.35 Max |
How does the composition of C22 differ from Hastelloy C276?
Although both are commonly used nickel alloys,C22 has a significantly higher chromium content (approximately 22%, compared to only 16% in C276).This makes C22 more effective in oxidizing environments (such as those containing nitric acid or wet chlorine),while C276 is better suited for strict reducing conditions.
Why is the low Carbon content critical for seamless pipes?
To minimize carbide precipitation within the heat-affected zone (HAZ) during welding,carbon content is restricted to below 0.015%.This enables Hastelloy C22 seamless steel pipe to be used directly in its “as-welded” condition for most chemical process applications without compromising its corrosion resistance.
Seamless Hastelloy C22 Pipe Mechanical Properties(Typical value range)
| Tensile Strength | Yield strength | Elongation | Hardness |
| 690 – 790 MPa(100 – 115 ksi) | 310 – 415 MPa(45 – 60 ksi) | 45% – 60% | 89 – 95 HRB |
Can the strength of C22 pipes be increased?
Yes.Although C22 steel pipes are typically supplied in the annealed condition,higher strength can be achieved through cold working,though this will reduce their natural hardness.
How does C22 compare to Hastelloy C276 in strength?
The mechanical properties of the two alloys are very similar.C276 typically exhibits a slightly higher ultimate tensile strength,but C22 offers superior formability and weldability,making it easier to fabricate into complex piping structures.
Physical Properties of Seamless Hastelloy C22 Pipe
Density:8.69 g/cm³ (0.314 lb/in³)
Modulus of Elasticity:206 GPa (29.9 x 10⁶ psi)
Poisson’s Ratio:0.32
Strength Changes in High-Temperature Environments
| Temperature | Yield strength | Tensile strength |
| 200°C (392°F) | ~ 38 ksi (260 MPa) | ~ 92 ksi (635 MPa) |
| 400°C (752°F) | ~ 31 ksi (215 MPa) | ~ 85 ksi (585 MPa) |
| 600°C (1112°F) | ~ 28 ksi (195 MPa) | ~ 80 ksi (550 MPa) |
Manufacturing Process for Seamless Hastelloy C22 Pipe
The manufacturing process for seamless Hastelloy C22 (UNS N06022) pipe is more complex than that for standard stainless steel,primarily relying on cold working to ensure tight dimensional tolerances and superior corrosion resistance.
Billet Preparation
Electric arc furnace (EAF) melting is typically employed,followed by argon-oxygen decarburization (AOD) refining.For C22 grades with high-quality requirements,an additional electric slag remelting (ESR) or vacuum arc remelting (VAR) process is usually incorporated to eliminate impurities.The refined round billets are then cut to predetermined lengths.
Hot Piercing / Extrusion
First,the pipe blank is heated to approximately 1100°C – 1200°C.Then,solid billets are processed into hollow blanks using a slant rolling piercing machine or an extruder.This is the core step in achieving the pipe’s “seamless” characteristic.
Cold Working
Cold Pilgering:
Rotational rolling of tubular material using a ring die,significantly reducing wall thickness while improving surface finish.
Cold Drawing:
Forming tubular material by drawing it through a die,suitable for producing small-diameter or ultra-thin-walled tubes.
Solution Annealing
C22 must be annealed at temperatures above 1121°C (2050°F).The purpose is to relieve internal stresses induced by cold working,re-dissolve alloying elements uniformly,and prevent precipitation of harmful intermetallic phases (such as μ-phase).Rapid water quenching or air cooling must follow annealing to ensure optimal corrosion resistance.
Pickling & Cleaning
Use an acid pickling solution composed of nitric acid and hydrofluoric acid to remove scale formed during annealing,restoring the surface to a passivated state.
Finishing & Testing
As a stainless steel pipe & tube manufacturer with over a decade of experience,we ensure the straightness of our pipes.Prior to shipment,we conduct inspections including eddy current testing (ET),ultrasonic testing (UT),or hydrostatic testing to detect internal defects.Finally,pipes are marked and packaged for shipment in accordance with ASTM B622 standards.
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