Stainless pipe fitting,stainless fitting,duplex stainless,31803,32750,32760,we are one of largest sour service stainless fitting supplier according to ISO 10156.
1. Material Overview
GH3030 (also known as GH30, equivalent to Russian ЭИ435) is an 80Ni-20Cr solid-solution strengthened superalloy standardized under GB/T 14992. It relies on chromium and nickel solution strengthening without precipitation hardening, delivering exceptional high-temperature oxidation resistance, structural stability, and thermal fatigue performance. The alloy offers stable mechanical properties up to 800°C in continuous service and resists short-term peaks up to 900°C. Free from aging brittleness and intergranular sensitization, it combines easy fabrication, excellent weldability, and consistent batch quality at a competitive cost.
C&N can supply a complete range of GH3030 products: seamless pipes, forged fittings, flanges, plates, sheets, round bars, flat bars, and custom precision forgings.
2. Product Range
- Forged fittings & flanges: elbows, tees, reducers, caps, anchor flanges (NPS 1/2–60, SCH10–SCH160).
- Seamless tubes & pipes: OD 16–720 mm, WT 3–90 mm, cut-to-length available.
- Plates, sheets & bars: thick plates, cold-rolled sheets, round and flat bars for structural parts and fastener blanks.
- Custom forgings: furnace rollers, nozzle bushings, ring forgings, aerospace low-load components.
3. Heat Treatment & Mechanical Properties
- Solution annealing: 980–1020°C, air cooling or water quenching (no aging required).
- Room-temperature tensile strength: ≥750 MPa
- 0.2% yield strength: ≥300 MPa
- Elongation: ≥40%
- Brinell hardness: ≤190 HB
- 700°C tensile strength: ≥295 MPa
- 700°C elongation: ≥30%
- Density: 8.2 g/cm³ | Service range: -196°C to 800°C (900°C short-term)
4. Core Advantages
- Superior oxidation resistance – self-repairing chromium oxide layer prevents scaling up to 800°C in dry air and flue gas.
- Thermal fatigue stability – single-phase microstructure resists brittle phases and crack propagation under cyclic loads.
- Excellent workability & weldability – supports GTAW, GMAW, laser welding; no post-weld hardening or cracking.
- Dry corrosion resistance – performs reliably in halogen gases, neutral flue gas, and high-temperature industrial environments.
- Cost-effective – simpler chemistry than precipitation-hardened grades, ideal for medium-load thermal components.
5. Chemical Composition (wt%, per GB/T 14992)
| Element | Specification |
|---|---|
| C | ≤0.12 |
| Cr | 19.00–22.00 |
| Ni | ≥74.00 |
| Ti | 0.15–0.35 |
| Al | ≤0.15 |
| Fe | ≤3.00 |
| Mn | ≤0.80 |
| Si | ≤0.80 |
| P | ≤0.015 |
| S | ≤0.015 |
GH3030 – UNS GH30 / XH78T High Temperature Alloy Equivalent Grades
| CHINA STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| GH3030 | – | GH30 | ЭИ435 | – | – | – | – | – |
GH3030 – UNS GH30 / XH78T High Temperature Alloy Mechanical Properties
| Element | Yield Strength (0.2%Offset) | Melting Point | Density | Tensile Strength | Elongation |
| GH3030 | MPa – | 1420 °C | 8.4 g/cm3 | MPa – 785 | Min 35 % |
6. Main Applications
- Aerospace: nozzle liners, thermal insulation parts, combustion chamber auxiliaries.
- Industrial furnaces: radiant tubes, liners, fixtures, heating element sleeves.
- Thermal power & energy: boiler high-temperature piping, waste-heat recovery tubes.
- Petrochemical: process piping, heater internals, dry high-temperature reactors.
- Metallurgical & environmental: high-temperature flue gas ducts, hot-gas handling components.
7. Quality Assurance
At C&N, Every batch receives PMI spectral verification, mechanical testing, 100% UT/MT non-destructive inspection, and dimensional calibration. All products are delivered with EN 10204 3.1 mill test certificates and permanent laser marking for full traceability.
