Inconel 617 Forgings UNS N06617 · W.Nr. 2.4663 · NiCr23Co12Mo · ASTM B564

Forged Inconel 617 product forms and size range

All items below are produced by open-die forging or on a radial-axial ring rolling mill, to drawing or to a dimensional description.

Supply condition: solution annealed. Surface: as-forged, shot blasted, rough machined or finish machined to drawing. Machining allowance is agreed before cutting.

Chemical composition of Inconel 617

Limits per ASTM B564 and ASME SB-564 for UNS N06617. Heat chemistry is reported on the mill certificate for every order.

Tighter internal limits, for example S below 0.008 percent or controlled Al plus Ti, can be applied on request for gas turbine and nuclear service.

Mechanical properties of Inconel 617 forgings

Room-temperature values in the solution-annealed condition. Specification minimums are the certified values. Typical values are the range normally obtained on our forgings.

Short-term tensile strength at temperature

Indicative values for guidance. For design work use ASME BPVC allowable stresses or certified curves for the specific heat and section size.

Physical properties

High-temperature and creep behaviour

Chromium in the alloy forms a Cr₂O₃ scale and aluminium develops an alumina sub-layer beneath it. These two oxides protect the material in air and in combustion gas to roughly 1100 °C. Cobalt and molybdenum held in solid solution restrict dislocation movement, which is the source of the creep strength above 800 °C.

• Oxidation. Protective and adherent scale in air to about 1100 °C, with good spalling resistance under thermal cycling.
• Carburisation. Better than most Ni-Cr alloys in carburising atmospheres up to 1095 °C, which is why the alloy is used for retorts and reformer internals.
• Aqueous corrosion. Good general resistance in oxidising and reducing media, and resistance to pitting and crevice attack. For seawater or wet chloride service, Inconel 625 or Hastelloy C-276 is usually more economic.
• Metallurgical stability. No embrittling sigma phase forms in normal service. The alloy is solid-solution strengthened, so there is no ageing response to lose.

Production route

Stages a component passes through at the Jiangyin plant, from heat to certificate.

1. Melting by EAF and VOD, with ESR availableThe heat is melted in an electric arc furnace and refined by vacuum oxygen decarburisation. Electroslag remelting is added where cleanliness and freedom from segregation are required, which is normal for gas turbine and nuclear parts.
2. Ingot verification and croppingSpectrometer analysis is checked against ASTM B564 limits before heating. Hot top and shrinkage cavity are cropped away.
3. Open-die forging at 1010 to 1205 °CForged in controlled passes with reheats, since the alloy work hardens rapidly. Reduction ratio is normally 4:1 or better, and the finishing temperature is held high enough to avoid hot cracking.
4. Ring rollingFor seamless rolled rings, the pierced blank is expanded on a radial-axial mill so that grain flow runs circumferentially around the ring.
5. Solution annealing at 1150 to 1180 °CHeld for a time proportional to section thickness, then water quenched or rapidly air cooled. The high temperature produces the coarse grain structure required for creep-rupture strength.
6. Machining and non-destructive testingRough or finish machining to drawing, then ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, plus PMI, tensile, hardness and grain size.
7. Certification and dispatchEN 10204 3.1 mill certificate as standard, or 3.2 witnessed by TUV, SGS, BV or Lloyd's Register. Marking, preservation and packing to customer specification.

Forging and heat treatment parameters

Tool geometry for machining is similar to that used for austenitic stainless grades such as 302, 303, 410 and 430F, but Inconel 617 is stronger and work hardens faster. Maintain a positive depth of cut to avoid glazing the machined surface.

Testing, NDT and certification

Equivalent grades and designations

The designations below all refer to the same alloy. Orders can be placed against any of them.

Inconel is a registered trademark of Special Metals Corporation, Nicrofer of VDM Metals, Pyromet of Carpenter Technology and Haynes of Haynes International. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with these companies. The names are used only to identify the alloy chemistry ordered.

Inconel 617 compared with 625, 718, 601 and Incoloy 800H

Selection guidance for the nickel grades most often considered alongside 617.

• Use 617 rather than 625 when the operating temperature is above 700 °C under sustained load. 625 loses strength quickly in that range.
• Use 617 rather than 718 above 700 °C. 718 is considerably stronger below 650 °C, but its strengthening phase over-ages and coarsens above that.
• Use 617 rather than 601 when the part carries load. 601 tolerates higher temperatures but has much lower creep strength.
• Use 800H rather than 617 when service is at or below about 900 °C and material cost is a controlling factor.

Applications for Inconel 617 forgings by industry

Supply capability

Jiangyin Jiangnan Metal Co., Ltd. is a forging factory rather than a trading company. Enquiries are handled by the production department, so quotations are returned within 24 hours and it can be confirmed at the enquiry stage whether a given geometry can be forged in one piece.

• Open-die forging and radial-axial ring rolling in one plant at Jiangyin, Jiangsu Province, about 150 km from Shanghai port.
• Nickel alloy range covering Inconel, Incoloy, Monel, Hastelloy, Nimonic, Waspaloy, Udimet, Haynes and Rene grades, alongside carbon, alloy, tool and stainless steel.
• Melting control by EAF and VOD as standard, with ESR specified where the application requires it.
• EN 10204 3.1 certification as standard, and 3.2 witnessed by TUV, SGS, BV, Lloyd's Register or DNV on request.
• Production to drawing, sketch or dimensional description, supplied as-forged, rough machined or finish machined.
• Regular export shipments to North America, Europe, the Middle East, India, Southeast Asia and Australia.

Frequently asked questions about Inconel 617

Document reference

This page is maintained by the manufacturer. Data is drawn from ASTM B564, ASME SB-564, SAE AMS 5887 and published producer datasheets for UNS N06617, cross-checked against mill test results. Values marked indicative are for guidance. Design against ASME allowables or certified heat data.