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Help CenterHigh-temperature Alloy, Heat-resistant and Corrosion-resistant ZG45Ni35Cr26 Centrifugal Cast Pipe Processing and Customization Manufacturer
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ZG45Ni35Cr26 centrifugal cast pipe = HP40 (standard type), is the most commonly used high nickel-chromium austenitic heat-resistant cast pipe in petrochemical and high-temperature furnaces, with long-term resistance to carburizing and creep at 1050–1100℃, and high cost performance.
1. Basic information
National standard: ZG45Ni35Cr26 (previously: ZG40Ni35Cr26Si2)
American standard: ASTM A297 HP (J95705)
German standard: 1.4857 / GX40NiCrSi35-26
Process: Centrifugal casting (fine grain, uniform wall thickness, few defects)
Applicable standards: GB/T 8492-2014, SH/T 3087-2017
II. Chemical Composition (wt%, Typical Values)
C: 0.40–0.50 (≈0.45) → carbide strengthening, creep resistance
Ni: 34–37 (≈35) → stable austenite, thermal shock resistance
Cr: 25–28 (≈26) → Anti-oxidation, anti-sulfidation
Si: 1.5–2.5 (≈2.0) → dense oxide film, resistant to carburizing
Mn≤1.5；P≤0.04；S≤0.03
Comparison: Without Nb; with approximately 1% Nb, it is HP40-Nb (ZG40Ni35Cr26Si2Nb1), which has higher high-temperature strength and higher price
III. Core Performance
1. Temperature capability
Continuous: 1050–1100℃
Short-term: 1200℃
Application: 800–1100℃, 1–3MPa, sulfur content/carburizing, frequent start-stop
2. Mechanical properties (room temperature / 1000℃)
Room temperature: tensile strength ≥650MPa, yield strength ≥280MPa, elongation ≥18%
1000℃: High endurance strength, superior creep resistance compared to HK40
3. Corrosion resistance / Anti-carburization
Oxidation rate:
Impermeability to carburization: strong, long-term resistance to embrittlement and coking
Sulfur-resistant (H₂S): Good, low corrosion rate
IV. Specifications (commonly used for centrifugal casting pipes)
Outer diameter: φ60~φ219 mm
Wall thickness: 6~20 mm
Length: 1.5~6 m (customizable)
Shapes: straight tube, U-bend, pigtail tube, reducer
V. Typical Applications
Ethylene cracking furnace: radiation section furnace tube, quench tube
Hydrogen production reformer: reformer tubes, manifold tubes
Heating furnace / metallurgical furnace: radiation section tube, furnace roller, muffle pot
VI. Heat treatment (as delivered)
Solution treatment: Heat at 1150–1180℃ for 2–4 hours, then air cool → dissolve carbides, achieve uniform microstructure
VII. HP40 (ZG45Ni35Cr26) vs HP40-Nb vs HK40
HP40: 1050–1100℃; without Nb; medium strength; medium price; conventional high-load
HP40-Nb: 1100–1150℃; with Nb; optimal creep resistance/thermal shock resistance; high price; ultra-high temperature long-cycle
HK40: ≤1000℃; low Ni content; moderate strength/carburizing resistance; low price; medium-low temperature
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