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Product Overview
Introduction To Hastelloy C-4 / Alloy C-4 / UNS N06455
MOKSH TUBES & FITTINGS LLP is a trusted supplier, exporter, importer, and stockist of high-performance Hastelloy C-4 (UNS N06455) products, including Pipes & Tubes, Pipe Fittings, Flanges, Sheets & Plates, Coils, Bars, Wire Mesh, and custom-engineered components.
HASTELLOY C4 is a nickel-chromium-molybdenum alloy designed to minimize welding challenges due to its low silicon and carbon content. Like other nickel alloys, it is known for its outstanding resistance to high-temperature oxidation, stress corrosion cracking, and strong oxidizing agents. With excellent stability across a wide range of thermal conditions, Hastelloy C-4 exhibits superior performance in harsh chemical environments—particularly in hot, contaminated mineral acids like hydrochloric and sulfuric acid. Its low carbon and silicon content also help prevent grain-boundary precipitation during welding, enhancing its weldability and corrosion resistance.
Hastelloy C-4 alloy is a nickel-chromium-molybdenum material specially developed to provide excellent corrosion resistance in highly aggressive environments. With its low carbon and silicon content, Hastelloy C-4 composition ensures superior weldability and resistance to grain boundary precipitation. It is widely used in industries that require corrosion-resistant alloys, particularly in hot mineral acids such as hydrochloric and sulfuric acid.
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Hastelloy C-4 – Specifications (UNS N06455)
| Category | Details |
|---|---|
| Grade | Hastelloy C-4 / Alloy C-4 / UNS N06455 |
| Material Type | Nickel–Chromium–Molybdenum Alloy |
| Key Characteristics | High-temperature stability, excellent corrosion resistance, superior weldability |
| Chemical Summary | Ni ≥ 65%, Cr 14.5–16.5%, Mo 14–17% |
| Operating Temperature | Up to 1040 °C (1900 °F) |
| Available Conditions | Annealed, Solution Annealed, Hot Rolled, Cold Worked |
| Heat Treatment | Solution Anneal at 1100–1160 °C with rapid cooling |
| Weldability | Excellent — minimal carbide precipitation |
| Corrosion Resistance | Outstanding in hot mineral acids and oxidizing environments |
| Testing Offered | PMI, Chemical Test, Hardness, Tensile, NDT, UT |
| Standards | ASTM B575, B619, B622, B626 |
| Certification | EN 10204 3.1 / 3.2 |
Chemical Composition of Hastelloy C-4 (UNS N06455)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 65.0 min |
| Chromium (Cr) | 14.5 – 16.5 |
| Iron (Fe) | 5.0 max |
| Molybdenum (Mo) | 14.0 – 17.0 |
| Cobalt (Co) | 2.0 max |
| Silicon (Si) | 0.08 max |
| Manganese (Mn) | 1.0 max |
| Carbon (C) | 0.015 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
The optimized chromium–molybdenum balance provides exceptional resistance to oxidizing and reducing acids.
Technical Composition Properties of Hastelloy C-4
Physical Properties of Hastelloy C-4
| Property | Value |
|---|---|
| Density | 8.64 g/cm³ |
| Melting Point | 1330 °C (2430 °F) |
| Tensile Strength | 690 MPa / 100,000 psi |
| Yield Strength (0.2%) | 310 MPa / 45,000 psi |
| Elongation | 40% |
Heat Treatment of Hastelloy C-4
| Process | Temperature Range | Cooling Method |
|---|---|---|
| Solution Annealing | 1100 – 1160 °C | Rapid air or water quench |
| Stress Relieving | 870 – 900 °C | Air cool, hold 1–2 hours |
| Hot Working | 900 – 1200 °C | Finish above 950 °C, quench afterward |
| Cold Working | — | Annealing required after severe forming |
| Post-Weld Heat Treatment | Optional | Enhances corrosion resistance |
Hastelloy C-4 is exceptionally stable at high temperatures, resisting carbide and sigma-phase precipitation.
Mechanical Properties of Hastelloy C-4
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 690 MPa | 100,000 psi |
| Yield Strength (0.2%) | 310 MPa | 45,000 psi |
| Elastic Modulus (RT) | 205 GPa | 29,700 ksi |
| Elongation (50.8 mm) | 40% | 40% |
| Hardness (Rockwell B) | 89 | 89 |
International Standards & Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | N06455 |
| W.Nr | 2.4610 |
| ASTM | B575, B619, B622, B626 |
| ASME | SB575, SB619, SB622, SB626 |
Products in Hastelloy C4
MOKSH TUBES & FITTINGS LLP, we offer Hastelloy C-4 in a variety of product forms to meet the diverse demands of industries facing aggressive chemical environments:
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Seamless Pipes
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Welded Pipes (ERW & EFW)
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Tubes (Capillary, U-Bend)
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Sheets & Plates
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Coils & Strips
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Round Bars, Flat Bars, Hex Bars, Square Bars
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Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
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Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
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Fasteners (Bolts, Nuts, Screws, Washers, Studs)
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Custom Fabricated Components
We offer Hastelloy C4 in a wide range of product forms, including:
Uses and Advantages
Superior resistance to strong oxidizers (especially nitric acid mixtures)
Excellent thermal stability up to 1040°C (1900°F)
Resistant to intergranular corrosion after welding
Maintains mechanical strength and integrity in extreme environments
Great weldability and workability for fabrication
Applications of Hastelloy C4
HASTELLOY C-4 is a nickel-chromium-molybdenum alloy specifically designed to offer excellent resistance to a wide range of corrosive environments, especially under high heat and stress. Known for its stability during welding and outstanding resistance to stress corrosion cracking, it's a trusted choice across several critical industries.
Chemical and Petrochemical Processing
Used in reactors, heat exchangers, piping systems, and pressure vessels that handle aggressive acids like hydrochloric, sulfuric, and phosphoric acid — even at elevated temperatures.
Pharmaceutical and Fine Chemical Industries
Ideal for process equipment that must withstand aggressive cleaning agents and maintain material integrity under high-purity conditions.
Pollution Control Systems
Applied in scrubbers, ducts, and stack liners that are exposed to hot, acidic gases and oxidizing media found in flue gas desulfurization (FGD) and other emission control setups.
Nuclear Industry
Relied on for components exposed to highly corrosive and high-radiation environments, including heat exchangers and piping in nuclear fuel reprocessing.
Pulp and Paper Industry
Suitable for bleaching and chemical recovery sections where strong oxidizers and acidic chemicals are in use.
Waste Treatment and Environmental Engineering
Used in waste acid recovery systems, incineration scrubbers, and wastewater components where resistance to mixed corrosive chemicals is essential.
HASTELLOY C-4's with its excellent resistance to oxidizing and reducing agents, plus superb weldability and thermal stability stands out as a dependable material in challenging, corrosion-prone applications where durability and safety are non-negotiable.
Hastelloy C-4 Price in India
Typical Range: ₹2,600 – ₹5,200 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is Hastelloy C-4 and what are its key properties?
Hastelloy C-4 (UNS N06455) is a nickel-chromium-molybdenum alloy engineered for high corrosion resistance, thermal stability, and superior weldability. It excels in resisting oxidizing and reducing agents, making it ideal for chemical processing, pharmaceuticals, and nuclear applications.
Which products are available in Hastelloy C-4?
MOKSH TUBES & FITTINGS LLP supplies Hastelloy C-4 in pipes, tubes, sheets, plates, coils, bars, flanges, fittings, fasteners, and custom-engineered components to meet diverse industrial requirements.
What industries use Hastelloy C-4?
Hastelloy C-4 is widely used in chemical and petrochemical processing, pharmaceutical production, pollution control systems, nuclear industries, pulp and paper, and waste treatment due to its ability to handle hot acids, oxidizers, and extreme temperatures.
Why is Hastelloy C-4 preferred over other nickel alloys?
Its low carbon and silicon content prevents grain boundary precipitation during welding, enhancing corrosion resistance and structural integrity. Additionally, it maintains mechanical strength under extreme heat and stress, outperforming many other nickel alloys.
Why choose MOKSH TUBES & FITTINGS LLP for Hastelloy C-4 products?
We offer ISO certified quality, ready stock, custom fabrication, in house manufacturing, and expert technical support, ensuring reliable supply of high performance Hastelloy C-4 products worldwide.
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