Are you torn between GH3030 and MP35N cold-drawn bars for your next high-performance project? While MP35N boasts world-class tensile strength, it often leads to over-design and unnecessary budget waste for high-temperature applications. In contrast, GH3030 (Nimonic 75 / EI435) offers the best return on investment for oxidation-resistant components at 800°C. Our technical sourcing team will assist you in selecting the most cost-effective high-temperature alloy grade based on your specific thermal and mechanical stress requirements.
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GH3030 vs. MP35N Cold-Drawn Nickel Round Bars
GH3030 vs. MP35N Cold-Drawn Nickel Round Bars
Both GH3030 and MP35N cold-drawn bars are high-performance nickel-based alloy bars, typically supplied in cold-drawn round bar form, but their design applications are quite different, each with its own focus. GH3030 round bars are a solid solution strengthened high-temperature alloy, characterized by excellent high-temperature oxidation resistance; while MP35N bars are a nickel-cobalt multiphase alloy, designed to achieve ultra-high strength, high toughness, and extremely strong corrosion resistance.
Why is titanium (Ti) so important in GH3030 alloy?
In many high-temperature alloys, grains grow uncontrollably at 800°C, leading to a decrease in metal strength. The titanium added to GH3030 alloy acts as a grain refiner. It forms stable carbonitrides that "pin" the grain boundaries, keeping the grains small and possessing good ductility.
1. Chemical composition of GH3030 cold-drawn rod and MP35N cold-drawn rod
| Feature | GH3030 Superalloy | MP35N (Cobalt-Nickel Alloy) |
| Primary Base | Nickel-Chromium (Ni-Cr) | Cobalt-Nickel-Chromium-Molybdenum |
| Key Ingredients | Ni (75%), Cr (20%), Ti (0.3%) | Co (35%), Ni (35%), Cr (20%), Mo (10%) |
| Strengthening Method | Solid Solution (Stable at high heat) | Work Hardened + Aged (Ultra-high strength) |
2.Mechanical properties and thermal limits of GH3030 rods and MP35N
| Mechanical Performance & Thermal Limits | GH3030 | MP35N |
|---|---|---|
| Tensile Strength (Rm) | ≥ 685 MPa | Up to 1700 - 2000 MPa |
| Oxidation Limit | Excellent at 800°C | Typically used below 600°C for strength |
| Ductility (Elongation) | ≥ 35% | 8 - 15% (in high-strength condition) |
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3. GH3030 Cold-Drawn Round Bar and MP35N Cold-Drawn Round Bar Characteristics and Applications
GH3030 Cold-Drawn Round Bar
Characteristics: Known for its good heat resistance, high plasticity, and high-temperature stability.
Optimal Applications: Structural components requiring resistance to high-temperature oxidation rather than extremely high mechanical strength in aerospace or industrial environments.
MP35N Cold-Drawn Round Bar (UNS R30035)
Characteristics: A multiphase alloy that achieves extremely high strength through work hardening and aging. It exhibits excellent resistance to hydrogen embrittlement, sulfidation, and seawater corrosion.
Optimal Applications: Applications requiring extremely high strength-to-weight ratios or highly corrosive environments (e.g., acidic gas wells, medical implants).
Specifications: Typically supplied according to ASTM F562 (medical) or AMS 5844/5845 (aerospace) standards.
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4. Choosing Between GH3030 Cold-Drawn Bars and MP35N Round Bars
If you are manufacturing combustion chamber liners, combustor assemblies, or industrial furnace linings for aircraft engines, choose GH3030 round bars. GH3030 offers excellent oxidation resistance at high temperatures up to 800°C and is more affordable per kilogram, resulting in a significant return on investment.
If you are manufacturing high-stress fasteners for deep-sea oil wells, medical implants, or aerospace components that require extremely high tensile strength (over 1500 MPa) and resistance to acidic gases/seawater corrosion at lower temperatures, choose MP35N cold-drawn bars.
Contact us now to get the latest export price for GH3030 in 2026
5. Why Choose Gnee Steel?
Whether you need the high-temperature stability of GH3030 or the ultra-high strength of MP35N, we offer a certified material supply chain:
Vacuum Infusion (VIM) + Electroslag Remelting (ESR): Ensuring both grades are free of internal defects and have extremely high purity.
Cold Drawing Precision Machining: Tight dimensional tolerances, suitable for high-speed CNC machining.
Quick Inquiry: Get a customized wholesale quote for in-stock products within 12 hours.
Fully Compliant with Standards: Provides EN 10204 3.1 Material Testing Certificate (MTC) and ultrasonic testing report.
Gnee Steel GH3030 certificate
FAQ
Q1: Can GH3030 replace MP35N in high-temperature fasteners?
A: Only if the primary requirement is oxidation resistance and the mechanical load is moderate. If your application requires ultra-high clamping force at temperatures above 600°C, you might need a precipitation-hardened alloy like GH4169 (Inconel 718) instead. Contact us for a technical audit!
Q2: Why is GH3030 more cost-effective for 800°C service?
A: GH3030 does not contain expensive Cobalt (Co) or large amounts of Molybdenum (Mo). Its Ni-Cr-Ti balance is specifically optimized for heat resistance rather than room-temperature hardness, reducing the raw material cost significantly.
Q3: What sizes do you keep in stock for GH3030 round bars?
A: We maintain a large inventory in stock for Φ 6.0mm up to Φ 250mm. For MP35N, we offer custom cold-drawing runs based on your specific diameter requirements.