Maher: Material Focus – Alloy 725 (UNS N07725)

We are pleased to announce that despite the current economic situation, Maher are continuing to invest in key stock grades to support the UK Valve industry. In December 2020 we will receive the first material as part of an extension to our existing range of Alloy 725 Round Bars.

Alloy 725 is a nickel-chromium-molybdenum-niobium alloy which gains its high strength through aging. Originally developed for Oil Patch applications such as well head and subsurface completions, Alloy 725 has been used as pressure containing, flow wetted components in subsurface safety valves and other downhole components.

Due to its substantial molybdenum content it can resist a broad range of corrosive environments including sour gas service and marine applications. It is resistant to pitting and crevice corrosion, hydrogen embrittlement and stress corrosion cracking in reducing media, brine, sea water and the effects of media containing hydrogen sulphide, chlorides and carbon dioxide. Alloy 725 gains its strength through aging and can be aged to strength levels comparable to 706 and 718.

Typical applications are hangers, landing nipples, side pocket mandrels, stems and bodies of special and subsea valves, polished bore receptacles in sour gas service, fasteners in marine applications and blades and critical components of steam and gas turbines.

Our stock range will cover popular sizes, starting at small fastener & stem diameters through to larger valve body sizes, with fully traceable mill certification to BS EN10204/3.2. Technically, this material has been manufactured to meet the latest industry standards including API 6A CRA & NACE MR0175. We have onsite PCN and SNT Level II Inspectors if additional ultrasonic testing is required to meet customer requirements.

Please contact your usual account manager or for any enquiries you may have for Alloy 725 or other material grades.

As a long-established stockist and machinist of high-strength, high-performance alloys for Oil & Gas, Aerospace, Naval & Marine, Defence, Power Generation and other special applications, we are able to assist you with material requirements for Nickel Alloys, Copper Alloys and other special steel grades. Our in-house services include cutting, first stage machining such as turning and boring, precision machining, heat treatment & NDT.

Due to the stringent requirements of the industries we service, quality is fundamental to everything we do. Maher’s quality systems are fully certified to ISO 9001 and AS 9100 rev D and we hold full JOSCAR Stage 2 accreditation for naval & marine, aerospace, defence and security applications. Supported by both customer and industry approvals, we deliver to the full supply chain, from OEMs to smaller machine shops. For more information, please visit

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