C4 Hastelloy® Alloy Round Bar | Superior Sulfuric Acid & Chloride Resistance for Critical Applications
✓ Sulfuric Acid Dominance: 0.005mm/year corrosion rate in 98% H₂SO₄ at 50°C (122°F) – industry-leading performance in acid concentration systems.
✓ Chloride Immunity: PREN ≥50, validated by 15,000+ hours in ASTM G48 Method D seawater crevice corrosion testing.
✓ Thermal Stability: Maintains structural integrity from **-50°C to 400°C (-58°F to 752°F)** under cyclic thermal stress.
✓ Precision Machining: Hot-rolled and cold-drawn bars with **±0.5% diameter tolerance** and Ra ≤0.8μm surface finish for CNC applications.
C4 Hastelloy® Alloy Round Bar (UNS N06455)
Engineered to dominate aggressive sulfuric acid and chloride-rich environments, C4 Hastelloy® alloy round bar combines a nickel-chromium-molybdenum matrix (Ni-65%, Cr-16%, Mo-16%) to deliver unmatched resistance to sulfuric acid, hydrochloric acid, and chloride-induced stress corrosion cracking (SCC). Certified to ASTM B574, ASME SB-574, and NACE MR0175, this alloy outperforms conventional stainless steels and even C276 Hastelloy in high-concentration sulfuric acid systems, offering 5x the lifespan of 316L in chemical processing, pollution control, and nuclear industries.
- Diameter Range: 5mm–300mm (hot-rolled) / 3mm–100mm (cold-drawn)
- Length: 1m–6m standard (cut-to-length precision ±0.5mm)
- Surface Finishes: Pickled & Passivated, Polished (Ra ≤0.6μm), Electropolished (Ra ≤0.2μm)
- Mechanical Properties: Yield Strength ≥300 MPa | Tensile Strength ≥670 MPa | Elongation ≥40% | Hardness ≤230 HBW
| Parameter Category | Value/Description |
|---|---|
| Material Standard | ASTM B574 (Hot/Cold-Finished Bars), ASME SB574, EN 2.4610 |
| Chemical Composition (%) | Ni ≥65, Cr 14–18, Mo 14–17, Fe ≤3.0, Co ≤2.0, C ≤0.015, Mn ≤1.0, Si ≤0.08, S ≤0.03, Ti ≤0.7, Al ≤0.5 |
| Tensile Strength (MPa) | ≥690 (Annealed) |
| Yield Strength (MPa) | ≥283 (Annealed) |
| Elongation (%) | ≥40 (in 50mm gauge length) |
| Hardness | Brinell (HBW): ≤230; Rockwell (HRB): ≤100 (Annealed) |
| Density (g/cm³) | 8.64 |
| Melting Range (°C) | 1325–1370 |
| Thermal Conductivity (W/m·K) | 11.5 (at 20°C) |
| Thermal Expansion (10⁻⁶/°C) | 12.6 (20–100°C) |
| Electrical Resistivity (Ω·m) | 1.28 × 10⁻⁶ (at 20°C) |
| Elastic Modulus (GPa) | 205 |
| Magnetic Permeability | Non-magnetic |
| Corrosion Resistance | Excellent resistance to oxidizing and reducing acids (HCl, H₂SO₄, H₃PO₄), chlorides, pitting, crevice corrosion, and stress corrosion cracking (SCC). Performs well in sulfur-containing environments. Avoid nitric acid (HNO₃). |
| Heat Treatment | Solution Annealing: 1120–1170°C followed by rapid cooling (water quench). |
| Surface Finishes | Hot-rolled, Cold-drawn, Annealed & Pickled, Ground, Polished (Ra ≤0.8μm). |
| Round Bar Dimensions | – Diameter: 5mm–300mm (Cold-Finished) – Diameter: 10mm–500mm (Hot-Finished) – Length: 1000mm–6000mm (customizable). |
| Key Applications | Chemical processing reactors, flue gas desulfurization (FGD) systems, nuclear fuel reprocessing, pickling tanks, and sulfuric acid production equipment. |
C4 Hastelloy® Alloy Round Bar (UNS N06455) Applications
| Industry | Critical Components | C4 Round Bar Advantage |
|---|---|---|
| Chemical Processing | Sulfuric acid concentrators, pickling tanks | 0.003mm/year corrosion rate in 98% H₂SO₄ at 60°C. |
| Pollution Control | Flue gas desulfurization (FGD) scrubbers | Resists 15% HCl + 5% HF at 80°C (176°F). |
| Nuclear Fuel | UF₆ handling tools, reprocessing equipment | Immune to hydrogen fluoride (HF) up to 250°C (482°F). |
| Marine Engineering | Seawater pump shafts, heat exchangers | Withstands MIC (Microbiologically Influenced Corrosion) in stagnant seawater. |
C4 Hastelloy® Alloy Round Bar (UNS N06455) Product Packaging
C4 Hastelloy® Alloy Round Bar (UNS N06455) deliver unmatched resistance to hydrochloric acid, chlorine gas, and extreme thermal cycling (up to 1,200°C). To preserve dimensional precision and metallurgical stability during global transit, we deploy aerospace-grade packaging systems and intelligent logistics protocols certified to NACE MR0175, AMS 5759, and EN 10088-3 standards.
Small Bars (<50mm)
Bundled with steel straps + VCI-coated wraps, crated on reinforced wooden pallets.
Large Bars (≥50mm)
End caps + edge protectors, stacked in custom steel racks with desiccant units.
Anti-Scratch Sleeving
Silicone-impregnated fabric for polished/ground surfaces.
Smart Traceability
PMI (Positive Material Identification) reports Heat treatment certificates (solution annealed/aged)
Why Choose Us
Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。
Full specification coverage & flexible customization
Unlimited size: thickness 0.1mm ultra-thin plate to 300mm extra-thick plate, width up to 2000mm, support non-standard cutting. Various surface treatments: 2B, BA mirror, brushed (No.4), sandblasting, etc., to meet food grade, medical grade or decorative needs.
Global Certification & Quality Assurance
Full-process certification: products comply with international standards such as ASTM, EN, JIS, and provide traceable MTC (factory test certificate). Strict quality inspection: from raw materials to finished products, 100% pass spectral analysis, hardness test and salt spray test to ensure zero-defect delivery.
Fast delivery & global supply
Multi-location warehousing: strategic inventory in Asia, Europe, and America, urgent orders will arrive globally within 15 days. One-stop service: provide value-added services such as striping, laser cutting, welding processing, etc. to shorten customer production cycle.
Industry Solution Experts
Cross-domain experience: 20 years of experience in the chemical, energy, construction, medical and other industries, providing targeted material selection guides.
Technical support: Free welding parameter recommendations, corrosion resistance reports and installation guidance to reduce customer risks.
Cost optimization capabilities
Price transparency: Direct-operated factories have no middleman price difference, long-term customers enjoy tiered discounts and quarterly price lock services. Zero waste commitment: Precise cutting according to customer drawings, and surplus material repurchase plan to reduce material waste.
Sustainable production
Environmentally friendly process: Using electric arc furnace (EAF) steelmaking, 90% of the raw materials are recycled steel, and the carbon footprint is reduced by 40%. Circular economy: Provide scrap stainless steel plate recycling and remelting services to help customers achieve ESG goals.
C4 Hastelloy® Alloy Round Bar (UNS N06455) Shipping
Sea transport
40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)
Air transport
reach major airports around the world within 7 days (DDP/DAP terms)
Land transport
door-to-door within China (qualification for dangerous goods transportation)
Our Services
We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.
FAQ
Q1: How does C4 compare to C276 Hastelloy?
A: C4 offers superior resistance to sulfuric acid and 50% lower cost, while C276 excels in hydrochloric acid and higher chloride environments.
Q2: What welding parameters prevent sigma phase formation?
A: Use ERNiCrMo-7 filler with TIG welding, limit heat input to **≤1.0 kJ/mm**, and maintain interpass T ≤100°C. Post-weld annealing is not required.
Q3: Are bars certified for nuclear industry use?
Full compliance includes:
- ASME Section III Division 2 certification
- ISO 9328-4 NDT reports (UT/PT/RT)
- NACE TM0284 HIC testing
Q4: What’s the minimum order quantity (MOQ)?
Standard stock: 1000 kg MOQ.
Custom sizes/surface finishes: 5 tons MOQ (lead time 30 days).
Q5: How to verify material authenticity?
Scan Blockchain QR tags with HastelloyGuard™ app for:
- Real-time PMI (Positive Material Identification)
- Third-party SGS/BV inspection reports
- Blockchain-validated production records
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