In the field of high-temperature alloy manufacturing, choosing the wrong sheet metal can lead to a manufacturing nightmare or premature mechanical failure. For purchasing managers and design engineers, material mismatch is a major pain point.
GH4145 Mistake: Using the high-hardness GH4145 (equivalent to Inconel X-750) for complex deep-drawn combustion chamber bushings can result in instantaneous cracking and costly mold damage.
GH3030 Mistake: Using the highly ductile GH3030 for high-tension springs or engine gaskets can lead to immediate stress relaxation and system leaks under load.
At Gnee Alloy, we ensure the safety of your material lifecycle by matching metallurgical materials to the specific mechanical functions of your parts.
Click to get a GH3030 product quote
GH3030 vs GH4145 High Temperature Resistant Nickel Alloy Plate
GH3030 vs GH4145 High Temperature Resistant Nickel Alloy Plate
GH3030 and GH4145 are both highly regarded nickel-chromium superalloys, widely used in extreme environments. However, their microstructures and ideal operating parameters differ significantly. GH3030 is a solid solution-strengthened alloy, suitable for low-stress, high-temperature oxidizing environments, with a maximum operating temperature of 800°C; while GH4145 is a precipitation-strengthened alloy, possessing excellent mechanical strength and creep resistance, with a maximum operating temperature of 980°C.
What are the components of GH3030?
GH3030 is a solid solution strengthened high-temperature alloy, mainly composed of nickel (Ni) and chromium (Cr), with a simple chemical composition. Its typical ratio is 80% nickel and 20% chromium.
1. GH3030 and GH4145 Material Overview
| Parameter | GH3030 | GH4145 |
|---|---|---|
| Material Type | Wrought Nickel-based Superalloy | Wrought Nickel-based Superalloy |
| International Equivalent | – | Inconel X-750 |
| Strengthening Mechanism | Solid-solution strengthening (Cr + trace Ti) | Precipitation hardening (γ′) |
| Product Forms | Plate, strip | Plate, strip |
| Typical Applications | Combustion chambers, furnace components, high-temperature tubing | Gas turbine blades, springs, fasteners, high-temperature structural components |
| Maximum Service Temperature (Load-Bearing) | ~800°C | ~700 – 750°C |
| Maximum Service Temperature (Oxidation) | ~1000°C | ~980°C |
2. Comparison of chemical composition of GH3030 and GH4145 (wt%)
| Element | GH3030 | GH4145 (Inconel X-750) | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance (≥ 75.0) | ≥ 70.0 | Similar |
| Chromium (Cr) | 19.0 – 22.0 | 14.0 – 17.0 | GH3030 has higher Cr |
| Iron (Fe) | ≤ 1.5 | 5.0 – 9.0 | GH4145 has higher Fe |
| Titanium (Ti) | 0.15 – 0.35 | 2.25 – 2.75 | GH4145 has much higher Ti |
| Aluminum (Al) | ≤ 0.15 | 0.40 – 1.00 | GH4145 contains Al |
| Niobium (Nb) | – | 0.70 – 1.20 | GH4145 contains Nb |
| Carbon (C) | ≤ 0.12 | ≤ 0.08 | Similar |
| Manganese (Mn) | ≤ 0.70 | ≤ 1.00 | – |
| Silicon (Si) | ≤ 0.80 | ≤ 0.50 | – |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.015 | – |
| Sulfur (S) | ≤ 0.020 | ≤ 0.010 | – |
| Copper (Cu) | ≤ 0.20 | ≤ 0.50 | – |
| Cobalt (Co) | – | ≤ 1.00 | – |
3. Comparison of high-temperature mechanical properties of GH3030 and GH4145
| Temp (°C) | Property | GH3030 | GH4145 |
|---|---|---|---|
| 500 | Tensile (MPa) | ~560 | ~950 |
| Yield (MPa) | ~250 | ~650 | |
| 600 | Tensile (MPa) | ~520 | ~850 |
| Yield (MPa) | ~240 | ~600 | |
| 650 | Tensile (MPa) | ~500 | ~750 |
| Yield (MPa) | ~230 | ~550 | |
| 700 | Tensile (MPa) | ~450 – 500 | ~650 |
| Yield (MPa) | ~220 | ~480 | |
| 750 | Tensile (MPa) | ~400 | ~550 |
| Yield (MPa) | ~200 | ~400 | |
| 800 | Tensile (MPa) | ~350 | ~450 |
| Yield (MPa) | ~180 | ~350 | |
| 850 | Tensile (MPa) | ~300 | ~350 |
| Yield (MPa) | ~150 | ~280 |
Click to download the GH3030 alloy PDF file now
How to choose between GH3030 and GH4145?
Choose GH3030 (equivalent to Nimonic 75)
Choose GH3030 (equivalent to Nimonic 75) if the following conditions are met:
Your application requires excellent machinability. Its single-phase austenitic structure provides ≥35% elongation.
Best applications: Industrial furnace linings, combustion chamber baffles, fire zone shields, and radiant tubes.
Machinability: Ideal for high-strength deep drawing, power spinning, and complex crack-free welding.
Choose GH4145 (equivalent to Inconel X-750)
Choose GH4145 (equivalent to Inconel X-750) if the following conditions are met:
Your design requires excellent yield strength and resistance to heat relaxation. It is precipitation hardened from aluminum and titanium.
Best applications: High-temperature springs, engine cylinder head gaskets, high-strength structural rings, and aerospace fasteners.
Load capacity: Maintains peak stiffness even when standard alloys sag.
6. GH3030 and GH4145 sheet dimensions and specifications
| Parameter | GH3030 Plate | GH4145 Plate |
|---|---|---|
| Thickness Range | 0.5 – 50 mm | 0.5 – 25 mm (typical) |
| Width Range | 500 – 2500 mm | 500 – 1200 mm |
| Length Range | 1000 – 8000 mm | 1000 – 6000 mm |
| Thickness Tolerance | ±5% – ±10% | ±5% – ±10% |
| Flatness | ≤ 3 mm/m | ≤ 3 mm/m |
| Surface Finish | AP, BA, CR, Polished | AP, BA, CR, Polished |
Common Plate Thicknesses
| Thickness (mm) | Thickness (in) | GH3030 Application | GH4145 Application |
|---|---|---|---|
| 0.5 – 1.0 | 0.020 – 0.040 | Heat shields, thin liners | Spring strips, thin components |
| 1.0 – 2.0 | 0.040 – 0.080 | Ducting, liners | Fastener stock, seals |
| 2.0 – 4.0 | 0.080 – 0.160 | Engine casings, structural panels | Turbine components, supports |
| 4.0 – 10.0 | 0.160 – 0.400 | Heavy structural components | Nozzles, structural parts |
| 10.0 – 25.0 | 0.400 – 1.000 | Thick plate applications | Heavy-duty components |
Contact us to customize GH3030 products to fit your project dimensions
Why choose to purchase from Gnee Alloy?
✅️VIM + ESR Melting: Our dual-vacuum refining process eliminates inclusions, ensuring superior fatigue life for both grades.
✅️Total Traceability: Every order is delivered with an EN 10204 3.1 MTC documenting exact heat analysis and mechanical parity with international standards.
✅️Wholesale Inventory: Massive stock of forged and hot-rolled plates from 1.0mm to 30.0mm ready for Fast Global Shipping.
✅️Custom Fabrication: We offer precision cutting and specialized aging heat treatment to deliver parts ready for assembly.
Gnee Alloy GH3030 certificate
Gnee Alloy Product Packaging
All stainless steel products are:
✅️Packed in wooden pallets or crates
✅️Covered with moisture-proof wrapping
✅️Labeled with heat number, standard, and size
✅️Shipped worldwide via sea, air, or express
Gnee Alloy GH3030 Packaging
Gnee Alloy Production Equipment and Product Testing
Contact us now to get the latest export price for GH3030 in 2026
FAQ
Q1: Can GH3030 handle the same oxidation as GH4145?
A: Actually, GH3030 often outperforms GH4145 in pure oxidation resistance above 800°C because its higher Nickel and Chromium content is more stable as a non-aging matrix. Only choose GH4145 if you also need mechanical load capacity.
Q2: Is GH4145 interchangeable with Inconel X-750?
A: Yes. GH4145 is the equivalent name in the Chinese GB system that belongs to the same metallurgical system as Inconel X-750 / UNS N07750.
Q3: Which alloy is better for large industrial furnace rollers?
A: GH3030 is typically preferred for static or low-load rollers due to its Cost-effective Solution and non-scaling surface. GH4145 is reserved for the high-tension springs inside the roller mechanism.
Q4: Do you offer trial quantities for prototype gaskets?
A: Absolutely. We support R&D innovation and offer Flexible MOQs for certified specimens of both alloys.