Most titanium-versus-Inconel articles are written by someone who sells one of them. Beiyu supplies both titanium and nickel alloys, so the useful answer is not “ours is better” but “here is where each one wins.” The choice usually turns on four checks: service temperature, weight sensitivity, the actual corrosive medium, and whether the extra cost of a nickel alloy adds anything the duty really needs.
The first decision is service temperature
Temperature is the first fork. Titanium alloys stay strong and light through moderate-temperature service, but under sustained load they lose useful strength and oxidation margin once the part moves much beyond about 315C. Nickel alloys such as Inconel 625 and 718 hold strength and oxidation resistance much higher, which is why they stay in scope for hotter pressure parts, exhaust hardware and high-heat fabricated components.
The practical rule is simple: if the duty is below about 315C and the design is not creep-limited, titanium is usually the lighter and less expensive structural choice. Once the duty moves into sustained high-temperature service, nickel alloys become the safer answer.
When weight matters, titanium wins clearly
Titanium is about 45% lighter than Inconel, near 4.5 g/cm3 versus roughly 8.2 to 8.5 g/cm3 for common Inconel grades. Where rotating mass, suspended load or transport weight matters, titanium gives a much stronger strength-to-weight result. Nickel alloys still win on absolute strength at temperature, but they do so with nearly double the density.
| Selection check | Titanium | Nickel alloy (Inconel) |
|---|---|---|
| Sustained service temperature | Loses useful strength and oxidation margin much beyond about 315 C | Holds strength and oxidation resistance well above that |
| Density | Near 4.5 g/cm3 | Roughly 8.2 to 8.5 g/cm3 |
| Weight against the other family | About 45 percent lighter | Baseline |
| Strength per kilogram | Leads | Lower, at nearly double the density |
| Absolute strength at temperature | Lower | Leads |
| Cost driver | Usually the lower cost of the two where the duty allows it | Nickel content and more complex processing |
The corrosive medium decides the rest
Both material families are corrosion-resistant, but they are not resistant to the same chemistries. The medium, concentration and temperature decide. On the nickel side the common ordered forms are nickel alloy pipe and tube and Alloy 825 tubing, quoted against the same service conditions used to judge titanium.
| Service medium | Better choice | Why |
|---|---|---|
| Seawater, wet chlorine, oxidizing and neutral chlorides | Titanium | Its passive oxide film is exceptionally stable in these media. |
| Reducing acids, sulfur-bearing chemistries and mixed hot acids | Inconel | Nickel-chromium-molybdenum alloys hold up where titanium’s film struggles. |
| Aggressive aqueous chloride with pitting and crevice risk | Both can work; Inconel 625 is often chosen | Alloy 625 is a common specification for chloride-service fabrication. |
| High-temperature oxidizing or creep service | Inconel | Strength and oxidation resistance stay useful far above titanium’s limit. |
For the seawater side, see our titanium seawater corrosion resistance guide. Where the chemistry moves into stronger acid or hotter chloride duty, the comparison shifts toward Alloy 625 plate and other nickel-alloy options already grouped in our chemical equipment range.
Strength and cost are the real trade
Inconel 718 carries roughly 40% higher specified minimum ultimate strength than Grade 5 titanium, around 1275 MPa versus 895 MPa. That higher high-temperature strength comes with a cost penalty driven by nickel content and more complex processing. If the duty does not need that extra heat capability or strength reserve, specifying Inconel can mean paying for performance the part never uses.
The honest summary is a trade, not a winner. Choose titanium when weight, seawater service, oxidizing chlorides or budget are the real constraint and the duty stays in a moderate temperature window. Choose Inconel when the service is hotter, more reducing, or genuinely strength-limited and the extra weight and cost are acceptable.
How to specify either one on an RFQ
An RFQ should describe the duty, not just the trade name. State the operating temperature, medium and concentration, pressure or mechanical load, form and dimensions with tolerance, quantity, and certificate scope. That allows the supplier to confirm whether titanium or a nickel alloy is the better route and quote the exact material instead of a generic substitute.
| Field to state | What to give |
|---|---|
| Operating temperature | The operating temperature |
| Medium and concentration | The medium and its concentration |
| Pressure or mechanical load | The pressure or mechanical load |
| Form and dimensions | Form and dimensions with tolerance |
| Quantity | The order quantity |
| Certificate scope | The certificate scope, which for both families can be EN 10204 3.1 with heat number traceability |
Both families can be quoted with EN 10204 3.1 documentation and heat-number traceability. The basic field list is in our titanium bar RFQ checklist. Because Beiyu supplies titanium together with Alloy 625, 718 and 825, an RFQ that is genuinely on the fence can be priced both ways for a direct selection decision.
FAQ
Is titanium or Inconel stronger?
Inconel is stronger in absolute terms. Inconel 718 is about 40% higher than Grade 5 titanium on specified minimum ultimate strength. Titanium wins on strength per kilogram because it is much lighter.
Is titanium or Inconel better for corrosion?
That depends on the medium. Titanium is usually better in seawater, wet chlorine and oxidizing chlorides. Inconel is usually better in reducing acids, sulfur-bearing chemistries and hotter mixed-acid duty.
When should I use Inconel instead of titanium?
Use Inconel when the service runs hotter than about 315C under load, when the chemistry is reducing rather than oxidizing, or when the part is strength-limited and the weight penalty is acceptable.
Which is more expensive, titanium or Inconel?
Inconel generally costs more because of nickel content and processing complexity. If titanium already meets the duty, switching to Inconel often adds cost without adding useful performance.
What changes on the order when the material family changes
Switching a line from titanium to a nickel alloy does not just change a grade. It changes which specification governs, which condition is meaningful, and which fields a certificate is expected to report. An RFQ written in titanium habits and sent for a nickel alloy usually comes back with questions in the same three places.
| Order field | Titanium | Nickel alloy |
|---|---|---|
| Grade identity | A grade number with its UNS, since the number alone appears in more than one specification | An alloy name with its UNS, since trade names and UNS numbers are not interchangeable in a contract |
| Governing specification | Named next to the grade, because the same grade appears across product forms | Named next to the alloy, because the same alloy is covered by different documents by form |
| Delivery condition | Usually annealed, stated apart from the surface | Condition matters more, since solution annealed and other conditions are not equivalent |
| Corrosion basis | Written as service medium, concentration and temperature | Same three, since neither family is selected on a metal name alone |
| Certificate scope | Set by the order, not by the metal | Set by the order, not by the metal |
The last row is where enquiries most often assume rather than state. Beiyu Titanium supplies both families with an EN 10204 3.1 mill test certificate carrying heat number traceability, and reviews grade, standard, dimensions, tolerance, surface condition and inspection scope before quotation, so the reporting scope is a line the buyer can set rather than discover.
Specification detail with sources
The published acceptance floors frame the strength comparison more precisely than trade names. ASTM B443 lists a minimum tensile strength of 827 MPa and a minimum yield strength of 414 MPa for annealed alloy 625 plate, UNS N06625, Grade 1, so in the annealed condition the nickel alloy sits below annealed Ti-6Al-4V on yield; the familiar strength advantage belongs to the age-hardened grades. Alloy 718, UNS N07718, is ordered to its own documents, ASTM B637 for bars and forgings and SAE AMS 5662 for aerospace stock, with minimums set by the heat treatment specified.
Two physical constants underlie the weight and temperature argument. The Special Metals alloy 625 data sheet gives a density of 8.44 g/cm3 and a melting range of 1290 to 1350 C, while ASM Handbook Volume 2 lists 4.43 g/cm3 for Ti-6Al-4V and about 1668 C for the melting point of unalloyed titanium. The density ratio, close to 1.9 to 1, is fixed by composition and survives every design revision, so weight-limited selections return to titanium whenever the duty temperature and chemistry allow it, and to nickel alloys when they do not.
| Material and condition | Ordered to | Minimum tensile | Minimum yield |
|---|---|---|---|
| Ti-6Al-4V, annealed | ASTM B265 | 895 MPa (130 ksi) | 828 MPa (120 ksi) |
| Alloy 625, annealed plate, UNS N06625 Grade 1 | ASTM B443 | 827 MPa | 414 MPa |
| Alloy 718, UNS N07718, bars and forgings | ASTM B637, or SAE AMS 5662 for aerospace stock | Set by the heat treatment specified | Set by the heat treatment specified |
Request a quote for titanium or nickel alloy
To quote the right route, Beiyu needs the service conditions, the form, dimensions and tolerance, the quantity, and the certificate scope. Send the drawing or specification through the contact page and we review whether titanium or a nickel alloy is the better fit before quoting.