MAR-M 247 is a nickel-base gamma-prime strengthened casting superalloy with a very high volume fraction of gamma-prime phase, roughly 65 to 70 percent, together with a large tungsten addition for solid-solution strengthening and tantalum for MC carbide stability. Hf is added to improve grain-boundary ductility and coating adherence. The alloy is normally supplied as master alloy bar for remelting in a vacuum induction furnace, and as net-shape cast rod for single-crystal or directionally solidified castings.
Chinese designation: MAR-M247 镍基单晶铸造高温合金母合金
| Element | Min % | Max % |
|---|---|---|
| Co | 9 | 11 |
| W | 9.3 | 10.5 |
| Cr | 8 | 8.8 |
| Al | 5.4 | 5.7 |
| Ta | 3 | 3 |
| Hf | 1.5 | 1.5 |
| Ti | 1 | 1 |
| Mo | 0.7 | 0.7 |
| C | 0.06 | 0.15 |
| Zr | 0.05 | 0.05 |
| B | 0.015 | 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 | AMS 5547 / customer specification |
| Master alloy ingot and button | Customer specification |
| 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.
MAR-M247 (MAR-M 247, MAR247, UNS R30747, Cast nickel-base superalloy) is a master alloys grade. MAR-M 247 is a nickel-base gamma-prime strengthened casting superalloy with a very high volume fraction of gamma-prime phase, roughly 65 to 70 percent, together with a large tungsten addition for solid-solution strengthening and tantalum for MC carbide stability. Hf is added to improve grain-boundary ductility and coating adherence. The alloy is normally supplied as master alloy bar for remelting in a vacuum inductio
ROBAN supplies MAR-M247 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.
