Inconel 738 is a nickel-base gamma-prime strengthened casting superalloy combining a high chromium content with cobalt, tungsten, molybdenum, niobium and tantalum. Aluminium plus titanium give roughly 40 to 45 percent gamma-prime, chromium forms a protective Cr2O3 scale against hot corrosion, and tantalum stabilises the MC carbides. The casting window is wide and the fluidity good, so thin-walled gas-cooled blade sections can be produced.
Chinese designation: Inconel 738 镍基铸造高温合金母合金 (K738)
| Element | Min % | Max % |
|---|---|---|
| Cr | 15.7 | 16.3 |
| Co | 8 | 9 |
| Al | 3.2 | 3.7 |
| Ti | 3.2 | 3.7 |
| W | 2.4 | 2.8 |
| Mo | 1.5 | 2 |
| Ta | 1.5 | 2 |
| Nb | 0.6 | 1.1 |
| Fe | — | 0.5 |
| Si | — | 0.3 |
| Mn | — | 0.2 |
| Zr | 0.05 | 0.15 |
| C | 0.09 | 0.13 |
| B | 0.005 | 0.015 |
| P | — | 0.015 |
| S | — | 0.015 |
| Ni | balance | — |
Chemical composition per the grade specification. Values are nominal; the mill test report is issued with every order, traceable to the heat number.
| Supply form | Standard / specification |
|---|---|
| Master alloy bar, as-cast, vacuum induction melted | GB/T 14992 / GJB 5512.1 |
| Master alloy ingot and button | GJB 5512.1 |
| Horizontally vacuum cast bar | Customer specification |
| Remelted casting rod for investment casting | Customer specification |
Master alloy is supplied in the as-cast condition. The melt route, vacuum level and remelting route for the buyer's own foundry are agreed on the order and recorded on the report.
Inconel 738 (Alloy 738, UNS R30738, K738, AMS 5389) is a master alloys grade. Inconel 738 is a nickel-base gamma-prime strengthened casting superalloy combining a high chromium content with cobalt, tungsten, molybdenum, niobium and tantalum. Aluminium plus titanium give roughly 40 to 45 percent gamma-prime, chromium forms a protective Cr2O3 scale against hot corrosion, and tantalum stabilises the MC carbides. The casting window is wide and the fluidity good, so thin-walled gas-cooled blade sec
ROBAN supplies Inconel 738 as master alloy bar, as-cast, vacuum induction melted, master alloy ingot and button, horizontally vacuum cast bar, remelted casting rod for investment casting, cut to the length you need and packed for remelting.
Yes. Every order ships with a mill test report covering the actual heat analysis of the melt, together with the heat number and the melt route. 3.2 documentation is available where the contract requires it.
Master alloy is made to order rather than held in stock. The usual lead time is 20 to 40 working days depending on the grade, the melt route and the quantity. Send us your specification for a firm date.
Yes. State the diameter, the length and the condition you need. Bar is normally supplied as-cast and cut to your length, and ingot is supplied as button or cube to match your melting equipment.
Drawing, grade, dimensions, quantity and delivery date — we price from those.
Request a Quote →Heat analysis report issued with every order at no extra charge.
Quality documentation →Shearing, sawing and machining to the tolerances on your drawing.
Capabilities →Buyers often substitute within a family once service conditions, corrosion behaviour or fabrication method narrow the choice.
