--- title: Alloy 625 Seamless Tube, UNS N06625, ASTM B444 / B704 | Ameritube description: Alloy 625 (Inconel 625, N06625) nickel-chromium-molybdenum seamless and welded tube for seawater, sour gas, and aerospace service. ASTM B444, B704, ASME SB-444. From Ameritube, Hillsboro, Texas. Request a quote. --- 100% Made in USA · Hillsboro, TexasISO 9001:2015 certified · [(254) 580-9888](tel:+12545809888) [![](https://ameritube.net/hs-fs/hubfs/raw_assets/public/ameritube-2026/images/logo.jpg?width=52&height=52&name=logo.jpg)AmeritubeCopper tube mill](https://ameritube.net/?hsLang=en) [Products](https://ameritube.net/products?hsLang=en)[Capabilities](https://ameritube.net/capabilities?hsLang=en)[Industries](https://ameritube.net/markets?hsLang=en)[Quality](https://ameritube.net/quality?hsLang=en)[Resources](https://ameritube.net/resources?hsLang=en)[Company](https://ameritube.net/company?hsLang=en) [Talk to the quote desk(254) 580-9888](tel:+12545809888)[Request a quote](https://ameritube.net/request-a-quote?hsLang=en) [tel:+12545809888](tel:+12545809888) Menu - [Products](https://ameritube.net/products?hsLang=en) - [Capabilities](https://ameritube.net/capabilities?hsLang=en) - [Industries](https://ameritube.net/markets?hsLang=en) - [Quality](https://ameritube.net/quality?hsLang=en) - [Resources](https://ameritube.net/resources?hsLang=en) - [Company](https://ameritube.net/company?hsLang=en) - [Call the mill](tel:+12545809888)[Request a quote](https://ameritube.net/request-a-quote?hsLang=en) ![](https://ameritube.net/hs-fs/hubfs/new-site/cast/spectrometer.jpg?length=960&name=spectrometer.jpg) Products / Nickel Alloys # Alloy 625, strength and corrosion resistance in one alloy. Nickel, 21% chromium, 9% molybdenum, and 3.6% columbium. Alloy 625 pairs the pitting and crevice resistance of a superalloy with a 60,000 psi yield strength in the annealed condition, no age hardening required. Seawater, sour gas, flue gas, and jet engines all use it. [Quote Alloy 625](https://ameritube.net/products/alloy-625#quote) [Or call the quote desk(254) 580-9888](tel:+12545809888) Alloy 625 at a glance SourcedSupplied from qualified mills. Inspected, tested, and certified by Ameritube in Hillsboro, Texas 100%Eddy current tested before shipment B444Supplied to ASTM B444, ASTM B704, ASME SB-444 MTRFull mill test report with every order **Alloy**Alloy 625 Inconel 625 (N06625) **Family**Nickel Alloys **Supplied to**ASTM B444, ASTM B704, ASME SB-444 **Typical service**Seawater, Sour gas, Aerospace **Size range**1/4" to 2-1/2" OD, .028" to .165" wall **Tempers**Annealed (Grade 1) or solution annealed (Grade 2) per B444 **Testing**100% eddy current or ultrasonic per B444/B704, hydrostatic, flattening, flaring; PMI and G28 corrosion test on request **Origin**Domestic and approved mills, inspected and certified in Hillsboro **Sourced alloy, certified in Hillsboro**Ameritube does not manufacture Alloy 625 in Texas. It is supplied from qualified domestic and international mills, then received, inspected, tested, and released under our ISO 9001:2015 system in Hillsboro, Texas, with a full mill test report. ## What Alloy 625 is Alloy 625 is a nickel-chromium-molybdenum-columbium alloy strengthened by solid solution, so it delivers high strength without heat treatment and holds it from cryogenic temperatures to about 1800 degrees F. The chromium and molybdenum give it pitting and crevice corrosion resistance comparable to C-276 in many environments, and it is immune to chloride stress corrosion cracking. ## Standards we supply to - ASTM B444 / ASME SB-444, seamless pipe and tube - ASTM B704 / ASME SB-704, welded tube - ASTM B705 welded pipe and AMS 5581 on request ## Chemical composition | Element | Requirement | | --- | --- | | Nickel | 58.0% min | | Chromium | 20.0 to 23.0% | | Molybdenum | 8.0 to 10.0% | | Columbium + Tantalum | 3.15 to 4.15% | | Iron | 5.0% max | | Carbon | 0.10% max | ## Typical mechanical properties, Grade 1 annealed | Property | Value | | --- | --- | | Tensile strength | 120,000 psi min (827 MPa) | | Yield strength | 60,000 psi min (414 MPa) | | Elongation in 2" | 30% min | ## Where it is used - Seawater heat exchangers, piping, and subsea components. - Sour gas production tubing, wellheads, and downhole tools. - Flue gas desulfurization and waste incineration. - Aerospace ducting, bellows, and exhaust systems. - Chemical process exchangers where strength and corrosion resistance both matter. - Nuclear and thermal power reactor components. **What to put in your Alloy 625 RFQ** Grade 1 (annealed, for corrosion service) or Grade 2 (solution annealed, for high temperature), seamless or welded, OD, wall, length, quantity, and any NACE MR0175, ASME, or aerospace specification. ### Documents - [Alloy 625 data sheet](https://ameritube.net/hubfs/PDFs/Alloy-625.pdf?hsLang=en)PDF - [Ameritube main brochure](https://ameritube.net/hubfs/PDFs/main_brochure.pdf?hsLang=en)PDF - [ISO 9001:2015 certificate](https://ameritube.net/hubfs/PDFs/ISO_CERT.pdf?hsLang=en)PDF ### Related alloys [C44300](https://ameritube.net/products/c44300-admiralty-brass?hsLang=en)[C70600](https://ameritube.net/products/c70600-copper-nickel-90-10?hsLang=en)[C71500](https://ameritube.net/products/c71500-copper-nickel-70-30?hsLang=en)[C72200](https://ameritube.net/products/c72200-copper-nickel-chromium?hsLang=en)[SA179](https://ameritube.net/products/sa-179?hsLang=en)[SA213 T5](https://ameritube.net/products/sa213-t5?hsLang=en) ### Industries [Marine & Defense](https://ameritube.net/markets/marine?hsLang=en)[Oil & Gas](https://ameritube.net/markets/oil-gas?hsLang=en) Alloy: Alloy 625 Inconel 625 (N06625) × Copper & Brass (Made in USA) **C12200**DHP Copper **C44300**Admiralty Brass **C70600**Copper Nickel 90/10 **C71500**Copper Nickel 70/30 **C72200**Copper Nickel Chromium Carbon & Alloy Steel **SA179**Seamless Carbon Steel **SA213 T2**Alloy Steel Boiler Tube **SA213 T5**Alloy Steel Boiler Tube **SA213 T9**Alloy Steel Boiler Tube **SA213 T11**Alloy Steel Boiler Tube **SA213 T12**Alloy Steel Boiler Tube **SA213 T22**Alloy Steel Boiler Tube Stainless & Duplex **TP304 / 304L**Stainless Steel **TP316 / 316L**Stainless Steel **TP321 / 321H**Stainless Steel **TP347 / 347H**Stainless Steel **SA268**Ferritic Stainless **SA249**Welded Stainless **SA789 S32205 / S31803**Duplex Stainless Nickel Alloys **Alloy 200**Nickel 200 (N02200) **Alloy 276**C-276 (N10276) **Monel 400**Nickel Copper (N04400) **Monel 405**Free-Machining Nickel Copper (N04405) **Alloy 600**Inconel 600 (N06600) **Alloy 625**Inconel 625 (N06625) **Alloy 800**Incoloy 800 (N08800) **Alloy 825**Incoloy 825 (N08825) Not sure? **Ask us**Describe the service and we will recommend the alloy No match. Pick "Ask us". **ISO 9001:2015**Bureau Veritas certified **Since 2004**Hillsboro, Texas Monel 400, Alloy 625, or Alloy 825? Tap an alloy to open its page | Property | [Monel 400](https://ameritube.net/products/monel-400?hsLang=en)Nickel Copper (N04400) | [Alloy 625](https://ameritube.net/products/alloy-625?hsLang=en)Inconel 625 (N06625) | [Alloy 825](https://ameritube.net/products/alloy-825?hsLang=en)Incoloy 825 (N08825) | | --- | --- | --- | --- | | Nickel | About 65% | About 60% | About 42% | | Hydrofluoric acid | Best | Fair | Poor | | Seawater pitting | Good | Excellent | Good | | Sulfuric and phosphoric acid | Fair | Good | Best | | Strength, annealed yield | 28 ksi min | 60 ksi min | 35 ksi min | | Typical pick | HF alkylation, seawater, salt | Sour gas, subsea, aerospace | Acid service, sour gas at lower cost | Not sure? Put the service conditions in the quote notes and we will recommend the alloy. ### Have a spec? Send it. Alloy, OD, wall, length, quantity. An engineer on the Hillsboro quote desk answers within one business day. 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