01 — Introduction

What is Hastelloy C22 Round Bar?

Hastelloy C22 Round Bar is a premium nickel-chromium-molybdenum-tungsten alloy engineered for exceptional resistance to a broad spectrum of corrosive environments. Manufactured under ASTM B574 and UNS N06022 standards, the C22 round bar is the go-to choice for engineers handling highly aggressive chemical media — from oxidising acids to reducing environments — where standard stainless steels simply fail.

The round bar form offers unmatched versatility: it can be precision-machined into flanges, bolts, valve stems, pump shafts, and reactor internals. Compared to other nickel alloys in the Hastelloy family, the Hastelloy C22 material delivers a uniquely balanced combination of oxidising and reducing acid resistance, making it the preferred choice in multi-environment process plants.

Delta Super Alloys supplies Hastelloy C22 Round Bar in a wide diameter range — from 6mm to 350mm — in hot-rolled, cold-drawn, and forged finishes, conforming to ASTM, ASME, and EN standards.

02 — Chemistry

Chemical Composition of Hastelloy C22 Alloy

The outstanding performance of C22 alloy originates in its precisely controlled chemical recipe. The balanced ratio of chromium to molybdenum to tungsten creates complementary corrosion-fighting mechanisms that no single-element addition could achieve alone.

The ultra-low carbon content (≤0.010%) is a critical differentiator of the C22 alloy. It virtually eliminates the risk of sensitisation and intergranular attack in the heat-affected zones of welds — a common failure mode in older alloy grades.

03 — Properties

Mechanical & Physical Properties

Understanding the Hastelloy C22 material properties helps engineers determine suitability for demanding temperature, pressure, and stress conditions. The data below reflects annealed round bar in solution heat-treated condition per ASTM B574.

Notable Physical Characteristics: Hastelloy C22 round bar exhibits excellent fabricability. It can be cold-formed, hot-worked (1177°C–1232°C range), and welded using GTAW, GMAW, and SMAW processes without post-weld heat treatment in most applications. Its high ductility (45% elongation) makes it far less brittle than many exotic alloys at equivalent strength levels.

04 — Corrosion

Corrosion Resistance — Why C22 Stands Apart

The defining advantage of Hastelloy C22 material is its broad-spectrum corrosion resistance. While many alloys excel in either oxidising or reducing media, C22 performs reliably in both — a critical benefit for mixed or variable process environments.

• Oxidising Acids: Excellent resistance to hot concentrated nitric acid, chromic acid, and wet chlorine environments where many alloys fail rapidly.
• Reducing Acids: High molybdenum and tungsten content provides superior resistance to hydrochloric acid, sulfuric acid, and phosphoric acid.
• Pitting & Crevice Corrosion: Outstanding resistance to localised attack — critical in chloride-rich environments such as seawater, brines, and bleaching solutions.
• Stress Corrosion Cracking: Demonstrates high resistance to stress corrosion cracking in chloride-containing media — a common failure mode for stainless steel components.

05 — Applications

Industries & Applications of Hastelloy C22 Round Bar

The versatile corrosion profile of the C22 alloy makes it indispensable across several high-value industries. Below are the primary sectors where Hastelloy C22 round bars are routinely specified.

• Chemical Processing Industry: Reactor vessels, agitator shafts, heat exchanger tube sheets, scrubber components. Pharmaceutical intermediate production plants rely on C22 for cross-contamination-sensitive wet chemistry.
• Flue Gas Desulphurisation (FGD) Systems: Power plant FGD systems expose components to hot sulfuric acid, HCl, and chlorides. C22 absorber liners, pump shafts, spray nozzles last 3–5× longer than duplex SS.
• Pulp & Paper Industry: Bleaching circuits using chlorine dioxide and hypochlorite demand C22 alloy bar stock for digesters, bleach washers, and piping.
• Oil & Gas / Sour Service: Downhole completions, wellhead components in high-H₂S and CO₂ environments; NACE MR0175 certified C22 round bars provide superior SCC resistance.
• Waste Treatment & Incineration: Waste incinerators produce corrosive flue gases (HCl, SO₂, chlorides). C22 components for afterburner chambers, scrubber internals demonstrate exceptional service life.

06 — Comparison

Hastelloy C22 vs C276 — Which Grade Is Right for You?

Verdict: For new plant design where mixed or variable corrosion environments are expected, Hastelloy C22 is the technically superior and more future-proof choice. For legacy systems already running on C276 in pure reducing acid service, grade substitution may not deliver proportionate value.

07 — Pricing

Hastelloy C22 Round Bar — Price Guide 2025

Indicative pricing based on diameter, finish, quantity, and nickel LME rates (Q2 2025). Contact Delta Super Alloys for live quotes.

* Prices are indicative only. Actual pricing depends on mill, quantity, certification, and LME nickel rate. Export / USD pricing on request.

Key Factors That Affect C22 Round Bar Pricing

• Nickel LME price — nickel accounts for roughly 55–60% of the alloy by weight.
• Molybdenum and tungsten surcharges applied separately by mills.
• Size and form (cold-drawn vs. forged) affect processing costs.
• Test certification requirements (EN 10204 3.1 vs 3.2, NACE, PMI) add premiums.
• Order quantity: full-cast lots (1,000–3,000 kg) attract best pricing; small-lot orders carry premium.

08 — Procurement

How to Buy Hastelloy C22 Round Bar from Delta Super Alloys

Delta Super Alloys is one of India's most trusted stockists of specialty nickel alloys. Our Hastelloy C22 Round Bar inventory is maintained in ready stock, enabling fast delivery across India and export markets.

• Mill-Direct Sourcing: Direct from approved mills with full material traceability.
• Certified Quality: EN 10204 3.1 / 3.2 MTCs, PMI reports, NACE MR0175 certifications on request.
• Custom Cutting: Exact-length cutting, rough machining, and surface finishing to reduce your in-house costs.
• Fast Dispatch: Standard sizes dispatched within 24–72 hrs from Mumbai & Pune warehouses. Pan-India logistics.

09 — FAQ

Frequently Asked Questions