Seamless Stainless Steel C4 Pipe
At GZH, a professional manufacturer and supplier based in Wenzhou, China, we specialize in the precision production of Hastelloy C4 seamless pipes using advanced seamless forming and cold-finishing processes. Our pipes are available in a comprehensive range of outer diameters, wall thicknesses, and surface finishes, including both standard ASTM specifications and fully customized dimensions to meet specific project requirements.
Manufactured in compliance with international standards such as ASTM B622 and ASME SB622, our Hastelloy C4 seamless pipes offer excellent thermal stability, superior resistance to pitting and stress corrosion cracking, and long-term structural integrity under extreme temperature and pressure conditions.
To guarantee premium quality and reliability, each pipe undergoes rigorous inspection and testing procedures, including hydrostatic testing, eddy current testing, PMI (Positive Material Identification), and ultrasonic testing.
With strict quality control, competitive pricing, and reliable global delivery, GZH has established a strong reputation as a trusted supplier of corrosion-resistant nickel alloy seamless pipes worldwide.
Seamless Hastelloy C-4 (UNS N06455) Pipe: Superior Thermal Stability
What Is a Seamless Stainless Steel C4 Pipe?
ASeamless Stainless Steel C4 Pipe (more accurately classified as a Nickel-Chromium-Molybdenum Superalloy) is a high-performance piping solution designed for extreme chemical environments. Manufactured from a single solid billet, this seamless pipe offers unmatched structural reliability by eliminating the weld-seam vulnerability.
The"C4"(UNS N06455) designation is renowned for its exceptional high-temperature stability. Its ultra-low carbon and silicon content prevents the formation of grain-boundary precipitates in the heat-affected zone (HAZ), making it the gold standard for applications involving long-term exposure to temperatures between 1200°F and 1900°F (650-1040°C). Unlike other nickel alloys, C4 maintains its ductility and corrosion resistance even after significant thermal cycling.
Key Features and Advantages
- Ultimate High-Temperature Stability: The optimized chemistry minimizes embrittlement, ensuring the pipe remains tough and corrosion-resistant after processing or welding.
- Versatile Corrosion Resistance: Outstanding performance in a wide array of aggressive media, including hot contaminated mineral acids, solvents, and chlorine-bearing environments.
- Localized Corrosion Protection: High molybdenum content ensures superior resistance to pitting and crevice corrosion.
- Stress Corrosion Cracking (SCC) Resistance: Inherently resistant to chloride-induced SCC, outperforming standard austenitic stainless steels.
- Seamless Integrity: Provides uniform wall thickness and higher burst pressure ratings, essential for high-risk chemical transfers.
Technical Specifications & Standards
We provide C4 pipes compliant with global industrial specifications to ensure seamless integration into your infrastructure.
Table 1: Chemical Composition of Hastelloy C4
The composition of C4 is carefully balanced to achieve its superior corrosion resistance and high-temperature stability.
| C | Si | Mn | P | S | Cr | Mo | Ni | Ti | Cu | Co | Fe |
| ≤0.015 | ≤0.08 | ≤1.00 | ≤0.025 | ≤0.015 | 14.00-18.00 | 14.00-17.00 | Bal | ≤0.70 | ≤0.50 | ≤2.00 | ≤3.00 |
Table 2: Typical Mechanical Properties of C4
Stainless Steel C4 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
Tensile Strength | Yield Strength | Elongation | Hardness |
≥ 690 MPa | ≥ 275 MPa | ≥ 42% | ≤ 100 HRB |
Table 3: Typical Physical Properties of C4
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
8.64 g/cm³ | 1335-1380 ℃ | 10.8 µm/m·℃ | 10.1 W/m·K | 208 GPa | 1.25 µΩ·m |
Table 3: Manufacturing Standards & Tolerances
Our production strictly adheres to international tolerance standards:
- ASTM B622: Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube.
- ASTM B619 / B626: For welded counterparts and general requirements.
- ASME SB622: Boiler and Pressure Vessel Code compliance.
- DIN 17751 / ISO 6207: European and International specifications for seamless nickel alloy tubes.
Common Industrial Applications
Due to its unique metallurgical stability, C4 seamless pipe is the preferred choice for:
- Chemical Processing: Reactors, agitators, and piping systems handling hot acids and chlorides.
- Pharmaceuticals: High-purity environments where intergranular corrosion must be zero.
- Waste Treatment: Incineration scrubbers and hazardous waste processing.
- Pulp & Paper: Bleaching plants and chlorine dioxide stages.
