Inconel Alloy Pipes, Tubes, Fittings and Flanges
Basic Description
Sagiant Piping Industries supports enquiries for INCONEL alloy pipes, tubes, butt weld fittings, forged fittings, flanges, bars and other specified product forms. Core grades include 600, 601, 625, 718 and X-750, with wider family grades available to order. Grades should be compared by composition, supply condition (annealed, solution-annealed or precipitation-hardened), applicable ASTM/ASME standard and service environment before selection. Availability, inspection scope and documentation (EN 10204 3.1 or 3.2) are confirmed against each enquiry. INCONEL is a registered trademark of Special Metals Corporation; Sagiant Piping Industries is an independent supplier and stockist, not the alloy producer. Alloy 825 is an INCOLOY (iron-nickel-chromium) grade, not an INCONEL grade — see the Incoloy Alloys page.
Inconel grades: chemistry, properties, standards and RFQ reference data
Grade-by-grade composition, condition-scoped mechanical and physical reference data, ASTM/ASME material routes by product form and dimensional references. Producer reference values are shown separately from specification acceptance limits, which are confirmed on the mill certificate.
Technical Specification
| Parameter | Specification |
|---|---|
| Product Forms | Seamless & welded pipe/tube, buttweld fittings (B366), forgings & flanges (B564), bars (B446/B637), sheet/plate (B168/B443) — routed per grade |
| Core Grades Supplied | Inconel 600, 601, 625, 718, X-750; wider INCONEL family to order (see Grade Directory) |
| Supply Condition | Annealed, solution-annealed or precipitation-hardened (solution + age) as ordered |
| Size Range | Confirmed per enquiry — see Sizes & Availability; not all grade/form/size combinations are stocked |
| Standards | ASTM B-series by grade and product form (see Standards matrix); ASME SB adoption where specified |
| Testing & Docs | Heat chemistry, tensile/proof/elongation, hardness where required, PMI, dimensional, NDE and corrosion testing per order; MTC EN 10204 3.1 or 3.2 |
INCONEL is a registered trademark of Special Metals Corporation. Identify the exact UNS number, specification edition and condition on enquiry; a trademark name alone is not a specification.
Chemical Composition (mass %)
| Grade | UNS | Ni | Cr | Mo | Fe | Nb+Ta | Co | W | Ti | Al | C max | Other controlled (max unless ranged) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 600 | N06600 | ≥72 (Ni+Co) | 14–17 | — | 6–10 | — | — | — | — | — | 0.15 | Mn 1.0; Si 0.50; S 0.015; Cu 0.50 |
| 601 | N06601 | 58–63 | 21–25 | — | bal | — | — | — | — | 1.0–1.7 | 0.10 | Mn 1.0; Si 0.50; S 0.015; Cu 1.0 |
| 617 | N06617 | ≥44.5 | 20–24 | 8–10 | ≤3 | — | 10–15 | — | ≤0.6 | 0.8–1.5 | 0.15 | Mn 1.0; Si 1.0; S 0.015; Cu 0.5; B 0.006; C min 0.05 |
| 625 | N06625 | ≥58 | 20–23 | 8–10 | ≤5 | 3.15–4.15 | ≤1 | — | ≤0.40 | ≤0.40 | 0.10 | Mn 0.50; Si 0.50; P 0.015; S 0.015 |
| 686 | N06686 | bal | 19–23 | 15–17 | ≤2 | — | — | 3–4.4 | 0.02–0.25 | — | 0.01 | Mn 0.75; Si 0.08; S 0.02; P 0.04 |
| 690 | N06690 | ≥58 | 27–31 | — | 7–11 | — | — | — | — | — | 0.05 | Si 0.50; Mn 0.50; S 0.015; Cu 0.50 |
| 693 | N06693 | rem | 27–31 | — | 2.5–6 | 0.5–2.5 (Nb) | — | — | ≤1 | 2.5–4 | 0.15 | Mn 1.0; Cu 0.5; Si 0.5; S 0.01 |
| 718 | N07718 | 50–55 (Ni+Co) | 17–21 | 2.80–3.30 | bal | 4.75–5.50 | ≤1 | — | 0.65–1.15 | 0.20–0.80 | 0.08 | Mn 0.35; Si 0.35; P 0.015; S 0.015; B 0.006; Cu 0.30 |
| 725 | N07725 | 55–59 | 19–22.5 | 7–9.5 | bal | 2.75–4 (Nb) | — | — | 1.0–1.7 | ≤0.35 | 0.03 | Mn 0.35; Si 0.20; P 0.015; S 0.010 |
| 740H | N07740 | bal | 23.5–25.5 | ≤2 | ≤3 | 0.5–2.5 (Nb) | 15–22 | — | 0.5–2.5 | 0.2–2 | 0.08 | Mn 1.0; Si 1.0; Cu 0.50; B 0.0006–0.006; C min 0.005 |
| X-750 | N07750 | ≥70 (Ni+Co) | 14–17 | — | 5–9 | 0.70–1.20 | ≤1 | — | 2.25–2.75 | 0.40–1.0 | 0.08 | Mn 1.0; Si 0.50; S 0.01; Cu 0.50 |
| 751 | N07751 | ≥70 (Ni+Co) | 14–17 | — | 5–9 | 0.70–1.20 | — | — | 2.0–2.6 | 0.9–1.5 | 0.10 | Mn 1.0; Si 0.5; S 0.01; Cu 0.5 |
| 783 | R30783 | 26–30 | 2.5–3.5 | — | 24–27 | 2.5–3.5 (Nb) | rem | — | 0.1–0.4 | 5–6 | 0.03 | Mn 0.50; Si 0.50; P 0.015; S 0.005; Cu 0.50; B 0.003–0.012 |
| 230 | N06230 | bal | 20–24 | 1–3 | ≤3 | — | ≤5 | 13–15 | — | 0.20–0.50 | 0.15 | Si 0.25–0.75; Mn 0.30–1.0; P 0.030; S 0.015; La 0.005–0.050; B 0.015; C min 0.05 |
| C-276 | N10276 | bal | 14.5–16.5 | 15–17 | 4–7 | — | ≤2.5 | 3–4.5 | — | — | 0.01 | Mn 1.0; V 0.35; P 0.04; S 0.03; Si 0.08 |
| HX | N06002 | bal | 20.5–23 | 8–10 | 17–20 | — | 0.5–2.5 | 0.2–1 | — | — | 0.15 | Mn 1.0; Si 1.0; P 0.04; S 0.03; C min 0.05 |
| 22 | N06022 | bal | 20–22.5 | 12.5–14.5 | 2–6 | — | ≤2.5 | 2.5–3.5 | — | — | 0.015 | V 0.35; Mn 0.50; S 0.02; Si 0.08; P 0.02 |
| G-3 | N06985 | bal | 21–23.5 | 6–8 | 18–21 | ≤0.50 | ≤5 | ≤1.5 | — | — | 0.015 | Cu 1.5–2.5; Si 1.0; Mn 1.0; P 0.04; S 0.03 |
Producer reference limits (Special Metals bulletins); “bal/rem” denotes balance and is not a fixed value. Unlisted elements are not guaranteed zero. The 718 limits are on an AMS basis and 690 has additional nuclear restrictions. These are not independently verified current limits for every ASTM/AMS product — the purchase specification edition and heat certificate control acceptance. Measured certificate values are results, not the limits themselves.
Inconel Grade Directory (UNS & material number)
| Grade | UNS | W.-Nr. | Relevance / qualification |
|---|---|---|---|
| 600 | N06600 | 2.4816 | Heat/process equipment; solid-solution Ni-Cr-Fe |
| 601 | N06601 | 2.4851 | Furnace and oxidation service |
| 617 | N06617 | 2.4663 | High-temperature strength and creep |
| 625 | N06625 | 2.4856 | Corrosion-resistant piping; distinguish annealed (Gr 1) / solution-annealed (Gr 2) |
| 686 | N06686 | 2.4606 | Aggressive chemical/process environments |
| 690 | N06690 | 2.4642 | High-chromium; nuclear tube requirements are specialised |
| 693 | N06693 | — | Metal-dusting / high-temperature corrosion |
| 718 | N07718 | 2.4668 | Age-hardened hardware; aerospace and oilfield conditions differ |
| 725 | N07725 | — | High-strength corrosion-resistant hardware |
| 740H | N07740 | — | Age-hardened advanced steam/power (A-USC) |
| X-750 | N07750 | 2.4669 | Springs/fasteners; heat treatment depends on service |
| 751 | N07751 | — | Precipitation-hardened exhaust-valve material |
| 783 | R30783 | — | Low-expansion Co-Ni-Fe hardware |
| 230 | N06230 | 2.4733 | High-temperature Ni-Cr-W alloy |
| C-276 | N10276 | 2.4819 | Chemical corrosion service (producer-branded C-276) |
| HX | N06002 | 2.4665 | Combustion / furnace components |
| 22 | N06022 | 2.4602 | Wet-process corrosion and selected overlays |
| G-3 | N06985 | — | Selected acid/process and tubular applications |
Complete coverage of the current Special Metals INCONEL bulletin index; not a claim to list every historical alloy, melt or welding consumable. UNS cross-references are not substitution approvals — match the exact specification, revision, chemistry, form, condition and inspection. Specialised variants (706 / N09706, 625LCF, 718SPF) exist in producer literature and are confirmed by specification on enquiry. Alloys 800/800H/800HT, 825 and 925 are INCOLOY, not INCONEL.
Mechanical Properties (room-temperature producer reference)
| Grade / product / condition | Tensile (MPa) | 0.2% proof (MPa) | Elong. % |
|---|---|---|---|
| 600, cold-drawn pipe/tube, annealed | 550–690 | 170–345 | 35–55 |
| 601, cold-drawn pipe/tube, annealed | 550–760 | 205–415 | 35–65 |
| 625, cold-drawn pipe/tube, annealed (B444 Gr 1) | 827–965 | 414–517 | 30–55 |
| 625, cold-drawn pipe/tube, solution-treated (B444 Gr 2) | 689–827 | 276–414 | 40–60 |
| 718, solution-treated + aged (bar/forging) | ≥1240 | ≥1035 | ≥12 |
| X-750, precipitation-hardened, <100 mm (per AMS 5667 discussion) | ≥1138 | ≥724 | ≥20 |
These are producer typical/composite room-temperature ranges, not guaranteed acceptance limits — the 625 bulletin states its ranges are not suitable for specification purposes. Values depend on product, size, orientation, condition and full heat-treatment designation. ASTM B444 defines N06625 Grade 1 (annealed) and Grade 2 (solution-annealed) as supply conditions, not different UNS alloys. For 718 keep solution-treated, aerospace precipitation-hardened and oil-tool tables separate; do not combine aerospace tensile minima with oilfield hardness limits. Elevated-temperature, creep/rupture, fatigue, hardness and grain-size requirements are taken from the ordered specification and confirmed on the certificate.
Physical Properties (density & melting range)
| Grade | Density (g/cm³) | Melting range (°C) |
|---|---|---|
| 600 | 8.47 | 1354–1413 |
| 601 | 8.11 | 1360–1411 |
| 617 | 8.36 | 1332–1380 |
| 625 | 8.44 | 1290–1350 |
| 686 | 8.73 | 1338–1380 |
| 690 | 8.19 | 1343–1377 |
| 693 | 7.77 | 1317–1367 |
| 718 | 8.19 annealed; ~8.22 aged | 1260–1336 |
| 725 | 8.31 aged | 1271–1343 |
| 740H | 8.05 | 1288–1362 |
| X-750 | 8.28 | 1393–1427 |
| 751 | 8.22 | 1390–1430 |
| 783 | 7.81 | 1336–1407 |
| 230 | 8.91 | 1360–1410 |
| C-276 | 8.89 | 1325–1370 |
| HX | 8.2 | 1260–1355 |
| 22 | 8.61 | 1351–1387 |
| G-3 | 8.14 | 1260–1343 |
Producer reference values, typical near ambient. Melting ranges are not service temperatures. Use the grade-specific density in the weight calculator, not one generic value. Thermal conductivity, specific heat, resistivity, modulus, thermal-expansion coefficient (with its temperature interval) and magnetic permeability are provided per grade on enquiry; for high-temperature service, temperature-dependent source tables apply rather than a single ambient figure. Example (600, ~20°C): conductivity 14.9 W/(m·K), resistivity 1.03 µΩ·m, specific heat 444 J/(kg·K), Young’s modulus 214 GPa.
Standards by Grade & Product Form
| Grade / family | Material-standard routes | Boundary |
|---|---|---|
| 600 / 601 | B167 seamless pipe/tube; B517 welded pipe; B516 welded tube; B166 rod/bar; B168 flat | Check exact grade and condition per edition; do not merge tube and pipe standards |
| 625 | B444 seamless pipe/tube; B705 welded pipe; B704 welded tube; B446 rod/bar; B443 flat | Separate Grade 1 / Grade 2; B446 is not a blanket wire spec |
| 617 / 690 / 693 | Grade-specific coverage under relevant B167 / B166 / B168 routes | Verify each UNS and product inclusion; do not extrapolate from 600 |
| 686 / 22 / C-276 | B622 seamless, B619 welded pipe, B626 welded tube, B574 bar, B575 flat | Check exact grade/class and current edition |
| 718 / X-750 | B637 and applicable AMS routes for bar/forgings; separate flat and wire standards | B637 is not a generic pipe or sheet specification |
| 725 | B805 for applicable bar/wire; B983 for applicable seamless tubular | Confirm ordered form, size and heat treatment |
| 740H | B983 seamless tubular route; construction-code / Code Case requirements separately | Historical approvals checked against the current project code |
| HX / 230 / G-3 | Grade-specific material/form mapping | Current product-standard verification required |
| Buttweld fittings | B366/B366M material + dimensions such as B16.9 | Exact grade/class, heat treatment and NDE |
| Forgings / flanges | B564 or other applicable material route + dimensional/rating basis | Not every family member is covered automatically |
| Fasteners | Applicable finished-component spec/drawing + material route | Bar compliance alone does not certify a finished fastener |
A routing matrix for specification review, not a universal certification. Where invoked, general-requirement standards B829 (seamless tubular), B751 (welded tube), B775 (welded pipe) and B906 (flat) also apply. ASTM and ASME SB adoption editions are not automatically identical. Construction codes (B31.3 / B31.1 / BPVC) define pressure design; a material standard does not by itself establish pressure suitability.
Available Forms, Sizes & Availability
Availability is confirmed per enquiry with stocked / sourced / made-to-order status — the ranges below are indicative, not a statement that every grade is held in every size, schedule and condition.
| Form | Size range | Wall / thickness / rating | Dimensional / material route |
|---|---|---|---|
| Seamless pipe | 1/8" – 24" NPS (DN 6–600) | Specified schedule / wall; S schedules and XXS are not one continuous series | B36.10M dims; B167 / B444 material |
| Tube (OD × wall) | 6–50 mm OD (tube OD is not NPS) | 1–6 mm wall; avg- or min-wall basis stated | B163 material; heat-exchanger route B163/B516 |
| Buttweld fittings | 1/2" – 24" | Matching wall; type-specific | B16.9 dims; B366 material |
| Flanges | Class 150–1500 to NPS 24; Class 2500 to NPS 12 only | Facing / bore / rating per class | B16.5 dims; B564 material |
| Bar | 6–250 mm dia | Annealed / solution-treated / aged as ordered | B446 / B637 (grade-dependent) |
Class 2500 is a flange pressure class, not “2500 psi”, and B16.5 Class 2500 extends only to NPS 12. Keep dimensional standards (B36.10 / B36.19) separate from material specifications. Theoretical weights use grade-specific density; see the schedule chart and weight calculator.
Corrosion & Temperature Selection
Do not present a melting range or an oxidation-test temperature as the maximum operating temperature of a pressure component. High-temperature life also depends on exposure duration, creep/rupture, thermal fatigue and stability.
Welding, Fabrication & Machining
Testing & Documentation
| Item | Basis |
|---|---|
| Heat chemistry (with C) | Laboratory analysis; handheld PMI/XRF confirms major elements only and cannot measure carbon or verify heat treatment |
| Tensile / proof / elongation | Per ordered specification, product and condition |
| Hardness | Where required — state scale, condition and acceptance |
| Intergranular corrosion (IGC) | Only with a named method, specimen condition and acceptance criterion — not a universal package |
| NDE / hydro / dimensional | Per specification and product form |
| Certification | EN 10204 3.1 or 3.2 (3.2 requires the agreed inspection arrangement); traceability by heat |
PMI confirms major alloying elements; it does not establish heat treatment, mechanical compliance or light/residual elements (carbon, nitrogen, boron), which need laboratory analysis and records. Specify supplementary tests and the certificate type at ordering.
Applications & Industries Served
Industry tags indicate typical use; the correct grade, form and condition depend on the specific component, environment, temperature, stress and life required — not the industry alone.
Product Range
The inconel alloys range can be supplied with related pipes, tubes, butt weld fittings, forged fittings, flanges, fasteners and custom fabricated items where required by the BOQ.
Applications
For dimensional references, see the Pipe Schedule & Fittings Guide. For related supply, review Pipes & Tubes, Butt Weld Fittings, Forged Fittings and Flanges.
Types of Products
| Type | Description |
|---|---|
| Pipes & Tubes | Seamless, welded and large-diameter supply |
| Fittings | Butt weld, forged and fabricated fittings |
| Flanges | Forged flanges and special machined items |
| Plates / Bars / Round Bars | Subject to grade and project availability |
Available Forms
Related Pages
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Frequently Asked Questions
What is Inconel, and how does it differ from Incoloy?
INCONEL and INCOLOY are Special Metals trademarks, not single specifications. INCONEL grades are nickel-based (nickel is the majority element), while INCOLOY grades such as 800/825 are iron-nickel-chromium with high nickel. Alloy 825 is an INCOLOY grade and is covered on the Incoloy Alloys page — always identify the exact alloy and UNS number rather than the brand name alone.
How do 600, 601 and 625 differ?
600 is a Ni-Cr-Fe alloy for heat and oxidation resistance; 601 adds chromium and aluminium for stronger high-temperature oxidation resistance; 625 adds molybdenum and niobium for much higher strength and broad acid, chloride and pitting resistance. They are selected for different service, and none is immune to every corrosion mechanism.
Is Inconel 718 interchangeable with 625?
No. 718 is precipitation-hardened (solution-treated and aged) for very high strength, while 625 is a solid-solution corrosion-resistant alloy. They differ in strengthening mechanism, condition, specification and cost, and are chosen for different duties.
What is alloy 625 Grade 1 versus Grade 2?
ASTM B444 distinguishes N06625 Grade 1 (annealed) and Grade 2 (solution-annealed), with different mechanical properties and intended service (Grade 2 for higher-temperature / creep use). These are supply-condition grades of the same UNS alloy, not different alloy numbers, and are not interchangeable — specify which grade is required.
Which grades and product forms are actually stocked?
Availability is confirmed per enquiry rather than implied as a continuous range. Core grades (600, 601, 625, 718, X-750) and wider family grades are offered as stocked, sourced or made-to-order depending on the grade, form, size and condition. Share the requirement and we confirm status with the quotation.
Does an MTC or PMI report prove sour-service suitability?
No. Sour-service acceptance to ISO 15156-3 / NACE MR0175 depends on the specific environment, material condition, cold work, ageing and hardness qualified to the standard. An MTC reports the heat, and handheld PMI confirms major elements only; neither establishes environmental qualification.
What temperature can an Inconel component withstand?
There is no single universal maximum. Oxidation resistance, mechanical/creep strength, corrosion and the governing design code each set different limits for the actual service, and exposure time matters. A melting range or an oxidation-test temperature is not the operating limit of a pressure component.
Which pipe and tube standards apply?
They are separate by grade and form — for example 600 seamless pipe is B167 (welded B517), while 625 seamless pipe/tube is B444 with welded pipe B705 and welded tube B704. Pipe (NPS/schedule) and tube (OD × wall) are ordered differently and are not interchangeable.
How are welding fillers and heat treatment selected?
By a qualified procedure. Filler is chosen for the alloy, joint, corrosion and strength needs — often over-alloyed for corrosion or dissimilar joints — and is not simply the matching parent-alloy name. Solid-solution grades usually need no PWHT; precipitation-hardening grades require their specified solution-and-age treatment.
What information is needed for a quotation?
Provide the alloy and UNS, product form, standard and edition, condition (annealed / solution-annealed / aged), dimensions, quantity, service environment and temperature, required testing (chemistry, corrosion method/acceptance, NDE), inspection document and delivery location. Availability and inspection scope are confirmed with the quotation.
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