1. Is Inconel X750 magnetic?
Inconel X750 (alloy designation N07750) is not strongly magnetic under ambient conditions. Its base matrix is an austenitic nickel-chromium alloy, and austenitic structures typically exhibit weak or no ferromagnetism. However, in some cases-such as after specific heat treatment processes that may promote the precipitation of minor magnetic phases (e.g., certain intermetallic compounds)-it might show very slight magnetic susceptibility. This slight magnetism is negligible for most industrial applications, and the alloy is generally classified as non-magnetic in practical use.
2. What is the other name for Inconel X750?
Inconel X750 is primarily known by its trade name "Inconel X750," which is a registered trademark of Special Metals Corporation. Beyond this, it is most commonly referenced by its alloy specification designations across different standards, rather than distinct "alternative names." Key specification-based identifiers include:
UNS number: N07750
ASTM/ASME designation: ASTM B637 (for bars, forgings, and forging stock), ASTM B670 (for wire), ASTM B671 (for sheet and strip)
AMS (Aerospace Material Specification): AMS 5667 (bars, forgings), AMS 5671 (wire), AMS 5598 (sheet/strip)
3. What is the UNS equivalent to N07750?
This question contains a slight misalignment: N07750 itself is a UNS (Unified Numbering System) designation for nickel-based alloys. The UNS system assigns unique 5-character alphanumeric codes to metals and alloys, and N07750 specifically corresponds to Inconel X750.
In other words, there is no "UNS equivalent to N07750"-instead, N07750 is the UNS code that defines Inconel X750. If seeking equivalent designations under other standards (e.g., DIN, JIS), examples include DIN 1.4558 or JIS NW4400, but these are not UNS equivalents.
4. What is the chemical composition of Inconel X750?
The chemical composition of Inconel X750 is strictly regulated by standards (e.g., ASTM B637, AMS 5667) to ensure its performance. Below is the typical composition (by weight percentage, wt%):
| Element | Minimum (wt%) | Maximum (wt%) | Primary Function |
|---|---|---|---|
| Nickel (Ni) | 70.0 | 75.0 | Base element; provides corrosion resistance and stabilizes the austenitic matrix |
| Chromium (Cr) | 14.0 | 17.0 | Enhances oxidation and high-temperature corrosion resistance |
| Iron (Fe) | 5.0 | 9.0 | Improves mechanical strength and fabricability without compromising corrosion resistance |
| Titanium (Ti) | 2.25 | 2.75 | Precipitates strengthening phases (e.g., γ'-Ni₃Ti) during heat treatment |
| Aluminum (Al) | 0.40 | 1.00 | Aids in γ' phase formation and improves high-temperature creep resistance |
| Niobium (Nb) + Tantalum (Ta) | 0.70 | 1.20 | Refines grain structure and enhances precipitation hardening |
| Carbon (C) | - | 0.08 | Controls carbide formation (excess C can reduce ductility) |
| Manganese (Mn) | - | 1.00 | Improves hot workability |
| Silicon (Si) | - | 0.50 | Acts as a deoxidizer during melting; limits to low levels to avoid embrittlement |
| Copper (Cu) | - | 0.50 | Trace element (minimized to prevent adverse phase formation) |
| Sulfur (S) | - | 0.010 | Controlled to low levels to avoid hot cracking and reduce corrosion risk |
5. What are the mechanical properties of Inconel X750?
Inconel X750's mechanical properties are highly dependent on its heat treatment condition (e.g., solution-annealed, precipitation-hardened). The most common condition for industrial use is the "precipitation-hardened" (age-hardened) state, which optimizes strength and creep resistance. Below are typical mechanical properties for Inconel X750 in the precipitation-hardened condition (per ASTM B637 and AMS 5667):
| Property | Test Condition | Typical Value | Minimum Requirement (ASTM B637) |
|---|---|---|---|
| Tensile Strength (UTS) | Room Temperature | 1,240–1,450 MPa | ≥ 1,100 MPa |
| Yield Strength (0.2% offset, YS) | Room Temperature | 965–1,200 MPa | ≥ 860 MPa |
| Elongation at Break | Room Temperature (50 mm gauge length) | 15–25% | ≥ 12% |
| Reduction of Area | Room Temperature | 30–45% | ≥ 25% |
| Hardness (Rockwell C, HRC) | Room Temperature | 35–45 HRC | - (no minimum; typical range) |
| Creep Rupture Strength | 650°C (1,200°F), 100-hour life | ≥ 345 MPa | - (application-specific; per AMS 5667) |
| Fatigue Strength (10⁷ cycles) | Room Temperature | ~480 MPa (fully reversed loading) | - (varies by surface finish) |
