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Help CenterCustomized Production of ZG40Ni35Cr26Si2 Cracking Furnace Tubes Resistant to High-temperature Oxidation, Sulfur Corrosion, and Carburizing
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ZG40Ni35Cr26Si2 ≈ HP40 (standard type, without Nb) is the most commonly used high-nickel-chromium-silicon austenitic centrifugal cast tube in the radiation section of ethylene cracking furnaces. It is designed for long-term use at 1100℃, with resistance to carburization, coking, and thermal shock, and offers high cost performance.
1. Basic information
National standard: ZG40Ni35Cr26Si2 (often abbreviated as ZG40Ni35Cr26)
American standard: ASTM A297 HP (J95705)
German standard: GX40NiCrSi35-26 / 1.4857
Process: Centrifugal casting (fine grain size, uniform wall thickness, fewer defects)
Implementations: GB/T 8492-2014, SH/T 3087-2017, HG/T 2601-2011
II. Chemical Composition (wt%, Typical / Range)
C: 0.35–0.45 (≈0.40) → carbide strengthening, creep resistance
Ni: 34–37 (≈35) → stable austenite, resistant to thermal shock / fatigue
Cr: 25–28 (≈26) → oxidation resistance, sulfuration resistance, carburization resistance
Si: 1.5–2.5 (≈2.0) → dense SiO₂+Cr₂O₃ film, resistant to coking
Mn≤1.5；P≤0.04；S≤0.03
Difference: Without Nb; with approximately 1% Nb, it is ZG40Ni35Cr26Si2Nb1 (HP40‑Nb), which has higher high-temperature strength and higher price
III. Core Performance (centrifugally cast tube, solid solution state)
1. Temperature capability
Continuous: 1100–1150℃ (100–150℃ higher than HK40)
Short-term: 1250℃
Operating conditions: 900–1150℃, 0.1–3MPa, hydrocarbon cracking, sulfur content, frequent start-stop
2. Mechanical properties (at room temperature)
Tensile strength: ≥650MPa
Yield strength: ≥300MPa
Elongation: ≥20%
1000℃: High endurance strength, far superior creep resistance to HK403. Corrosion resistance / carburizing resistance
Oxidation rate:
Impermeability to carburization: extremely strong, no embrittlement over a long period, and the inner wall is resistant to coking
Sulfur resistance (H₂S≤3%): Corrosion rate **≤0.03mm / year **
4. Physics / Organization
Density: 7.85g/cm³
Microstructure: single-phase austenite + eutectic carbide, without phase transformation, with good thermal stability
IV. Common specifications of cracking furnace tubes (centrifugally cast tubes)
Outer diameter: φ60～φ180mm (mainstream φ102/φ114/φ127)
Wall thickness: 8–16mm (commonly used 10/12/14mm)
Length: 3–6m (cut-to-length)
Forms: straight tube, U-bend, pigtail tube, reducer
V. Typical Applications
Ethylene cracking furnace: radiation section tubes (core), quench tubes, transition section tubes
Hydrogen production reformer: reformer tubes, manifold tubes
Heating furnace: radiation section/convection section tubes, furnace rollers
VI. Heat treatment (as delivered)
Solution treatment: Heat at 1150–1200℃ for 2–4 hours, then air cool → dissolve carbides, achieve uniform microstructure
No stabilization required (HP40-Nb requires stabilization at 850–900℃)
VII. Difference from ZG45Ni35Cr26 (HP40 old standard)
ZG40Ni35Cr26Si2: C ≈ 0.40, Si ≈ 2.0, a mainstream new standard, with better resistance to coking
ZG45Ni35Cr26: C ≈ 0.45, Si ≈ 1.0, old standard, slightly higher strength, slightly weaker resistance to coking
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