What UNS N06022 Hastelloy C22 round bar is used for - in one sentence: Hastelloy C22 round bar (UNS N06022) is the corrosion-resistant nickel alloy bar you choose when your machined component must resist both oxidizing and reducing media - strong acids, chlorides, seawater, and mixed corrosive environments - and you need fast delivery from a China supplier. If your application requires excellent corrosion resistance, good strength and toughness in high-temperature applications, and reliable weldability without post-weld heat treatment, C22 round bar is the answer.
Hastelloy C22 (UNS N06022, DIN 2.4602, NiCr21Mo14W) is a Ni-Cr-Mo-W superalloy containing approximately 56% nickel, 22% chromium, 13% molybdenum, and 3% tungsten, with low carbon (≤0.015%) and low silicon (≤0.08%) . The combination of molybdenum and tungsten provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking, while the high chromium content delivers excellent resistance to oxidizing media . This makes C22 one of the most corrosion-resistant alloys available - outperforming C276 and Alloy 625 in many aggressive environments .
That is why Hastelloy C22 round bar is widely used for chemical processing equipment, pharmaceutical reactors, heat exchangers, gas turbine components, FGD systems, pulp and paper equipment, and nuclear fuel reprocessing - anywhere both oxidizing and reducing corrosion must be resisted.
Product Basic Specifications
| Item | Details |
|---|---|
| Grade | Hastelloy C22 Round Bar / Alloy C‑22 Rod |
| Material Designation | UNS N06022; W.Nr.2.4602; Chinese Grade: Ni‑Cr21‑Mo14W |
| Manufacturing Standard | ASTM B574 / ASME SB574 |
| Diameter Range | 3 mm‑600 mm (hot‑rolled, forged, cold‑drawn, centerless‑ground) |
| Length | Random mill length 0.5‑6 m; fixed cut‑to‑length per drawing |
| Surface Condition | Black hot‑rolled, peeled, cold‑drawn bright, centerless ground, polished finish |
| Machining Precision Tolerance | Hot‑rolled / peeled bar: ISO h11 tolerance; Cold‑drawn bar: h8‑h9; Centerless‑ground bar: h7 tolerance, diameter tolerance down to −0.018 mm for 10‑18 mm diameter, delivering high dimensional accuracy for precision mechanical parts |
| Inspection & Document | PMI spectral inspection, UT non‑destructive test, original Mill Test Certificate, mechanical property report |
| Processing Service | Custom cutting, facing, turning, threading, milling, forging blanks per customer drawings |
Machinability & Welding Performance for Project Evaluation
Machinability
C22 is considered moderate to machine among nickel-based superalloys. With proper tooling and parameters, it can be turned, milled, drilled, and threaded to tight tolerances.
| Parameter | Recommendation |
|---|---|
| Tooling | Carbide with positive rake, sharp edges |
| Cutting speed | Low to moderate |
| Feed rate | High to avoid work hardening |
| Coolant | Generous flow to manage heat |
| Achievable tolerance | ±0.01 mm on critical dimensions with proper setup |
| Surface finish | Ra ≤0.8 μm achievable with fine finishing |
Cold working: C22 work-hardens rapidly. Multiple intermediate anneals are required between cold working passes to restore ductility and maintain dimensional accuracy.
Hot working:
Start temperature: 1232°C (2250°F)
Finish temperature: 954°C (1750°F)
Welding:
C22 can be welded by TIG, MIG, and plasma methods . Low carbon and silicon suppress carbide precipitation, so no post-weld heat treatment is required . Filler metals: C22 filler or equivalent. Preheating not required. Post-weld pickling recommended for optimum corrosion resistance.
Nickel‑Base Alloy Comparison & Material‑Selection Guidance
| Grade | Core Advantages | Limitations vs UNS N06022 Hastelloy C22 | When to select this alloy for your project |
|---|---|---|---|
| Hastelloy C22 UNS N06022 | Excellent Corrosion Resistance; good strength and toughness in high‑temperature applications; balanced oxidizing‑reducing media performance; ground bar up to h7 precision | Higher material cost | First‑choice for mixed oxidizing‑reducing corrosion, high‑temperature corrosive service, FGD, pharmaceutical & pulp‑paper shaft and mechanical parts |
| Hastelloy C276 UNS N10276 | Superior reducing‑acid corrosion resistance | Inferior performance under strong oxidizing‑ion environment; lower high‑temperature oxidation resistance compared with C22 | Projects dominated by reducing‑acid service with limited oxidizing contaminants |
| Hastelloy B‑3 UNS N10675 | Outstanding pure hydrochloric‑acid resistance | Poor corrosion performance if oxidizing ions exist; limited high‑temperature oxidation resistance | Pure reducing‑HCl service without oxidizing impurities |
| Inconel 625 N06625 | Excellent high‑temperature mechanical strength | Limited performance under mixed oxidizing‑reducing acid corrosion | Components prioritizing high‑temperature strength rather than heavy mixed‑acid corrosion resistance |
How to choose:
Choose C22 when you need superior resistance to both oxidizing and reducing media, good machinability, and reliable welding without post-weld heat treatment. C22 outperforms C276 in oxidizing environments and Alloy 625 in reducing environments .
Choose C276 when you need maximum resistance to reducing acids (HCl, H₂SO₄) and higher service temperature (up to 815°C).
Choose Alloy 625 when you need higher strength and higher temperature capability (up to 980°C), but with lower corrosion resistance in reducing acids.
Hastelloy C22 features elevated chromium content delivering excellent oxidation resistance and robust corrosion performance in weld heat‑affected zones, ideal for nitric‑sulfuric mixed acid, heavily‑welded pressure vessels and alternating oxidizing‑reducing service conditions.
Before finalizing your material specification, compare performance gaps among Hastelloy C22, C276, C4, B2 and B3 in our Hastelloy alloy grade‑to‑application selection guide. Learn which alloy fits your temperature, medium and welding scenario, and prevent improper grade substitution that shortens equipment service life.
Typical Applications
- Chemical processing: Reactors, piping, storage tanks for strong acids and corrosive media
- Pharmaceutical: Reactors, piping, and equipment for corrosion-resistant processing
- Oil & gas: Corrosion-resistant piping and equipment for oil and gas extraction and processing
- Power generation: Heat exchangers, boiler components for high-temperature and corrosive service
- Pollution control: FGD systems, SO₂ cooling towers, acid pickling systems
- Pulp & paper: Reactors, piping for corrosive pulping chemicals
- Nuclear: Reactor components, heat exchangers for nuclear fuel reprocessing
- Food processing: Piping and storage tanks where corrosion resistance and non-toxicity are required
Sizes, Forms & Availability
You can find Hastelloy C22 round bar in a wide range of dimensions and finishes to suit different applications.
Diameter Range: Typically available from as small as 3 mm up to 800 mm .
Length: Commonly supplied in random lengths of 3 to 6 meters, though custom lengths can be cut to order .
Surface Finish: Options include Bright (cold drawn, polished), Centreless Ground (for precision applications), and Black/Rough Turned (for larger diameters) .
Shapes: In addition to round bars, it is also available as hexagonal (hex), square, flat, and hollow bars for machining into different components
A "Mill Test Certificate (MTC)" is a crucial document that accompanies the material, certifying its chemical composition and mechanical properties meet the required standards
Why Choose Us - Our Capacity for Hastelloy C22 Products
HSMetal is a specialized China‑based supplier for high‑grade nickel‑base corrosion‑resistant alloys, delivering fast delivery of UNS N06022 Hastelloy C22 round bar for global industrial customers.
- Strict metallurgical control: AOD+VOD double‑refining process for raw material, chemical composition controlled within tight tolerance, stable Cr‑Mo‑W ratio to guarantee consistent excellent corrosion resistance for every batch.
- Multi‑form & precision processing capacity: Supply hot‑rolled, forged, cold‑drawn and centerless‑ground C22 round bar, hex‑bar, square‑bar. In‑house grinding workshop can achieve ISO h7 precision for high‑precision mechanical component requirements.
- Full‑traceability quality assurance: PMI spectral inspection, UT non‑destructive test and full original Mill Test Certificate are available. Third‑party inspection (SGS / BV) can be arranged upon buyer's request.
- Fast‑delivery mechanism: Common specifications kept in warehouse stock, greatly shorten lead‑time for urgent orders. Both small‑batch sample trial orders and large‑volume engineering orders are accepted. In‑house machining supports custom cutting, turning, threading and forging blanks per drawings.
- Professional technical support: Our material‑engineering team provides alloy‑selection consultation, welding‑procedure suggestions, machining‑parameter guidance and application risk assessment. Beside Hastelloy C22 round bar, we also supply matching plate, seamless pipe, fittings and other nickel‑base grades for one‑stop procurement.
Commercial and Delivery Term
| Item | Details |
|---|---|
| Trade Terms (Incoterms 2020) | EXW, FOB Shanghai, CFR, CIF, DAP |
| Payment Terms | T/T (30 % deposit, balance before shipment); L/C at sight |
| MOQ | Sample & bulk project orders welcome; consult sales for exact minimum quantity |
| Lead‑time | Common stock sizes:7‑14 working days; MTO forged / ground custom dimension:30‑45 working days |
| Customized Services | Fixed‑length cutting, facing, turning, threading, milling, forging blanks, centerless grinding, special tolerance processing per customer drawings |
| Packaging | Anti‑rust oil applied, seaworthy export wooden crate / steel frame for nickel‑alloy bars |
| Inspection | Mill Test Certificate provided; third‑party inspection SGS / BV available on buyer's request |
| Quotation Validity | 30 calendar days unless written agreement otherwise |
About Us
HSMetal is a professional China‑based nickel‑base superalloy supplier with broad product coverage spanning Hastelloy, Inconel and other premium corrosion‑resistant grades, supplying plate, seamless pipe, round bar, fittings, strip and custom‑machined alloy components. Supported by robust in‑house processing capabilities including hot forging, cold drawing, centerless grinding and CNC machining, we are capable of tight‑tolerance manufacturing down to ISO h7 for round bars to meet diverse drawing‑driven custom requirements.
We deliver tailored material solutions for customers active in chemical processing, pharmaceutical manufacturing, oil & gas, power generation, pollution control, ocean engineering and pulp‑paper sectors, addressing harsh corrosive and high‑temperature operating challenges. For service & delivery, we maintain local warehouse stock for mainstream specifications to realize fast‑turnaround shipment for sample trials and large‑volume engineering orders, providing one‑stop procurement to simplify customers' sourcing workflow.
Our rigorous quality‑control system adopts AOD+VOD refined raw materials, full‑batch PMI spectral inspection and ultrasonic non‑destructive testing with complete mill documentation for full traceability; third‑party inspections such as SGS and BV are also acceptable upon request.
Guided by "Quality‑Oriented, Delivery‑Prioritized", our engineering team offers material‑selection consultation, welding advice and machining guidance, helping global industrial clients mitigate project risks and lower overall operational costs.
Our Factory
Vacuum Melting Furnace
Automatic Cold Drawing Line For Corrosion-Resistant Nickel Alloy Bar
Solution Annealing Furnace
4-Tensile Testing Machine
Flaw Detector
Hardness Tester
Need UNS N06022 Hastelloy C22 Round Bar?
Tell us your required diameter, length, quantity, condition, and application environment. We will confirm availability, provide a quotation, and ship with full documentation. Fast delivery available for stock sizes.
FAQ
Q1: What standard applies for UNS N06022 Hastelloy C22 Round Bar? What are equivalent designations?
A: Our round bar complies with ASTM B574 / ASME SB574. Equivalent marks: UNS N06022, W.Nr.2.4602, Chinese grade Ni‑Cr21‑Mo14W.
Q2: What machining precision can Hastelloy C22 round bar achieve for my precision‑part project?
A: Hot‑rolled peeled bar reaches ISO h11 tolerance; cold‑drawn bar reaches h8‑h9; centerless‑ground bar can achieve ISO h7 tolerance, diameter tolerance down to −0.018 mm for 10‑18 mm diameter range for shaft and precision‑component manufacturing.
Q3: Which welding filler metal shall I use for Hastelloy C22 round‑bar welding? Do I need post‑weld heat‑treatment?
A: Use matching filler ERNiCrMo‑10 (GTAW/GMAW) or ENiCrMo‑10 (SMAW). Post‑weld solution‑annealing heat‑treatment is optional; only highly recommended for extremely critical mixed‑oxidizing‑reducing corrosive operating conditions.
Q4: What is maximum continuous working temperature for UNS N06022 Hastelloy C22 round bar with good strength and toughness?
A: To retain good strength and toughness in high‑temperature applications, long‑term continuous service temperature should not exceed 677 °C (1250 °F). Brittle sigma‑phase will precipitate above this temperature and degrade material performance.
Q5: Can Hastelloy C22 fully replace Hastelloy C276 for all corrosion‑resistant bar projects?
A: No. Hastelloy C22 owns excellent corrosion resistance and better high‑temperature strength‑toughness under oxidizing‑ion‑rich environments. Hastelloy C276 performs superiorly under heavy pure reducing‑acid service. Material selection shall match your exact process‑medium composition.
Q6: Do you support custom forging, threading and blank‑making for Hastelloy C22 round‑bar components? Can you arrange fast delivery for urgent orders?
A: Yes. Our processing workshop supports cutting, turning, threading, milling and forging‑blank fabrication per customer drawings. Stock sizes support fast delivery for urgent projects; both small‑batch sample and large‑volume orders are acceptable.
Q7: Is PMI inspection available before shipment?
A: Yes, every batch supports on‑site PMI positive‑material‑identification inspection. Complete original Mill Test Certificate will be supplied.
Q8: What is UNS N06022 Hastelloy C22 round bar used for?
A: C22 round bar is used for chemical processing equipment, pharmaceutical reactors, heat exchangers, gas turbine components, FGD systems, pulp and paper equipment, and nuclear fuel reprocessing . It is chosen when you need superior resistance to both oxidizing and reducing media, chlorides, and seawater .
Q9: What is the difference between C22 and C276?
A: C22 has higher chromium (20–22.5% vs 14.5–16.5%) and lower molybdenum (12.5–14.5% vs 15–17%) than C276 . This gives C22 better resistance to oxidizing media, while C276 offers better resistance to reducing acids (HCl, H₂SO₄) and higher maximum service temperature (815°C vs 677°C) . C22 generally offers better overall versatility and is often preferred when both oxidizing and reducing conditions are present.
Q10: What is the difference between C22 and Alloy 625?
A: C22 has higher molybdenum (12.5–14.5% vs 8–10%) and tungsten addition, giving it superior corrosion resistance in reducing acids and chloride environments . Alloy 625 offers higher strength and higher temperature capability (up to 980°C) but lower corrosion resistance in reducing media . Choose C22 for corrosion resistance; choose 625 for high-temperature strength.
Q11: Can C22 round bar be welded without post-weld heat treatment?
A: Yes. C22's low carbon (≤0.015%) and low silicon (≤0.08%) design suppresses carbide precipitation during welding. Welded joints maintain corrosion resistance without requiring post-weld heat treatment . TIG, MIG, and plasma welding are all suitable. Post-weld pickling is recommended for optimum corrosion resistance.
Q12: What is the maximum service temperature of C22?
A: C22 is not recommended for service above 1250°F (677°C) due to the risk of embrittling phase formation . Continuous service is generally limited to 550°C . For higher temperature applications, consider C276 (up to 815°C) or Alloy 625 (up to 980°C).
Q13: What is the heat treatment for C22 round bar?
A: C22 requires solution annealing at 1000–1200°C, followed by rapid cooling to prevent precipitation of unwanted phases (sigma, chi). The standard anneal is 1121°C (2050°F) followed by rapid quench . This treatment maintains corrosion resistance and mechanical properties.
Q14: What is the one-line rule for choosing UNS N06022 Hastelloy C22 round bar?
A: Choose UNS N06022 Hastelloy C22 round bar when you need excellent corrosion resistance in both oxidizing and reducing media, good strength and toughness at high temperature, good machinability, and fast delivery from a China supplier - for chemical, pharmaceutical, FGD, or nuclear applications.
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