Nickel Alloy Pipes, Fittings & Flanges Supplier
Overview
Sagiant Piping Industries supports enquiries for nickel and nickel-bearing alloys — commercially pure nickel (200/201), nickel-copper (Monel 400, K-500), nickel-chromium heat-resistant alloys (600/601), nickel-chromium-molybdenum corrosion alloys (625, C-276, C-22), nickel-molybdenum alloys (B-2/B-3), iron-nickel-chromium alloys (800/800H/800HT, 825, Alloy 20) and precipitation-hardening alloys (718, X-750, K-500, 925). These are distinct families with very different chemistry, corrosion behaviour and heat treatment — nickel content alone is not a useful category. This page is a comparison hub; use the family links above for full grade data, and confirm grade, form, condition, testing and certification with the quotation.
Nickel alloy grades, chemistry, standards and RFQ reference data
Nickel and nickel-bearing alloys by family and product form, with chemistry, mechanical, physical and standards references. Values carry a basis label (specification / producer / nominal); because full current licensed standards were not available, confirm the adopted ASTM edition, grade, condition and product form on the material certificate.
Nickel Alloy Families & Classification
| Family | Representative alloys | Character & typical service | Full data |
|---|---|---|---|
| Commercial nickel | Nickel 200, 201 | Caustic, chlorine chemistry; 201 low-carbon for >315°C. | Nickel 200/201 › |
| Nickel-copper | Monel 400, K-500 | Seawater, brine, HF acid; K-500 age-hardened for strength. | Monel › |
| Nickel-chromium (heat) | Inconel 600, 601 | Oxidation and high-temperature strength; 601 higher Cr/Al. | Inconel › |
| Nickel-chromium-moly + Nb | Inconel 625 | High strength with broad acid/chloride/sour resistance. | Inconel › |
| Precipitation-hardening | 718, X-750, 925 | Very high strength after solution + age; condition-critical. | Inconel › / Incoloy › |
| Iron-nickel-chromium | Incoloy 800/800H/800HT, 825, Alloy 20 | Heat (800 family) and acid/chloride (825, Alloy 20) service. | Incoloy › / Alloy 20 › |
| Nickel-Cr-Mo (corrosion) | C-276, C-22, Alloy 59, 686 | The most aggressive mixed-acid and chloride environments. | Hastelloy › / Alloy 59 › |
| Nickel-molybdenum | Hastelloy B-2, B-3 | Non-oxidising acids (HCl) — sensitive to oxidising contamination. | Hastelloy › |
| High-temperature specialty | Hastelloy X, Nimonic, Haynes, Waspaloy, Rene 41 | Gas-turbine and furnace duty; aerospace qualification separate. | Hastelloy › / Nimonic › / Haynes › |
| Controlled-expansion / magnetic | Invar 36, Kovar, Permalloy | Low/controlled thermal expansion and magnetic applications. | Invar 36 › / Kovar › / Permalloy › |
The 800-family, 825 and Alloy 20 are iron-nickel-chromium alloys, not nickel-base. "INCONEL", "INCOLOY", "MONEL", "HASTELLOY", "NIMONIC" etc. are trademarks, not ASTM grades — and there is no universal "≥50% Ni" rule (e.g. INCONEL 706 is ~39–44% Ni). Identify the exact alloy and UNS.
Chemical Composition (wt %, nominal reference)
| Alloy | UNS | Ni | Cr | Mo | Fe | Cu | C max | Other |
|---|---|---|---|---|---|---|---|---|
| Commercial nickel & nickel-copper | ||||||||
| Nickel 200 | N02200 | ≥99.0 | — | — | ≤0.40 | ≤0.25 | 0.15 | Mn ≤0.35, Si ≤0.35 |
| Nickel 201 | N02201 | ≥99.0 | — | — | ≤0.40 | ≤0.25 | 0.02 | low-carbon (>315°C) |
| Monel 400 | N04400 | 63–70 | — | — | ≤2.5 | 28–34 | 0.30 | Mn ≤2.0, Si ≤0.5, S ≤0.024 |
| Monel K-500 | N05500 | 63–70 | — | — | ≤2.0 | 27–33 | 0.25 | Al 2.3–3.15, Ti 0.35–0.85 (age-hardening) |
| Nickel-chromium & Ni-Cr-Mo-Nb | ||||||||
| Inconel 600 | N06600 | ≥72 | 14.0–17.0 | — | 6.0–10.0 | ≤0.5 | 0.15 | Mn ≤1.0, Si ≤0.5 |
| Inconel 601 | N06601 | 58–63 | 21.0–25.0 | — | balance | ≤1.0 | 0.10 | Al 1.0–1.7 |
| Inconel 625 | N06625 | ≥58 | 20.0–23.0 | 8.0–10.0 | ≤5.0 | — | 0.10 | Nb+Ta 3.15–4.15 (combined), Al/Ti ≤0.40 |
| Precipitation-hardening | ||||||||
| Inconel 718 | N07718 | 50–55 | 17.0–21.0 | 2.8–3.3 | balance | ≤0.30 | 0.08 | Nb+Ta 4.75–5.5, Ti 0.65–1.15, Al 0.20–0.80 (aged) |
| Inconel X-750 | N07750 | ≥70 | 14.0–17.0 | — | 5.0–9.0 | ≤0.5 | 0.08 | Ti 2.25–2.75, Al 0.40–1.0, Nb+Ta 0.70–1.20 (aged) |
| Incoloy 925 | N09925 | 42–46 | 19.5–23.5 | 2.5–3.5 | balance | 1.5–3.0 | 0.03 | Ti 1.9–2.4, Al 0.1–0.5 (aged) |
| Iron-nickel-chromium | ||||||||
| Incoloy 800 | N08800 | 30.0–35.0 | 19.0–23.0 | — | ≥39.5 | ≤0.75 | 0.10 | Al 0.15–0.60, Ti 0.15–0.60 |
| Incoloy 800H | N08810 | 30.0–35.0 | 19.0–23.0 | — | ≥39.5 | ≤0.75 | 0.05–0.10 | Al+Ti 0.30–1.20; controlled grain size |
| Incoloy 800HT | N08811 | 30.0–35.0 | 19.0–23.0 | — | ≥39.5 | ≤0.75 | 0.06–0.10 | Al+Ti 0.85–1.20 |
| Incoloy 825 | N08825 | 38.0–46.0 | 19.5–23.5 | 2.5–3.5 | balance | 1.5–3.0 | 0.05 | Ti 0.6–1.2, Al ≤0.2 |
| Alloy 20 | N08020 | 32.0–38.0 | 19.0–21.0 | 2.0–3.0 | balance | 3.0–4.0 | 0.07 | Nb+Ta 8×C–1.0 (stabilised) |
| Nickel-Cr-Mo & Ni-Mo corrosion alloys | ||||||||
| Hastelloy C-276 | N10276 | balance | 14.5–16.5 | 15.0–17.0 | 4.0–7.0 | — | 0.01 | W 3.0–4.5, Co ≤2.5 |
| Hastelloy C-22 | N06022 | balance | 20.0–22.5 | 12.5–14.5 | 2.0–6.0 | — | 0.015 | W 2.5–3.5 |
| Hastelloy B-2 | N10665 | balance | ≤1.0 | 26.0–30.0 | ≤2.0 | — | 0.02 | Co ≤1.0 (non-oxidising acids only) |
| Hastelloy B-3 | N10675 | balance | 1.0–3.0 | 27.0–32.0 | 1.0–3.0 | — | 0.01 | Co ≤3.0 |
| Hastelloy X | N06002 | balance | 20.5–23.0 | 8.0–10.0 | 17.0–20.0 | — | 0.05–0.15 | W 0.2–1.0, Co 0.5–2.5 |
Nominal producer reference chemistry — not a verified complete current-edition table. Full controlled elements (Mn/Si/P/S, residual each/total, combined Nb+Ta, B/N), heat vs product analysis and footnotes need the adopted specification. 625 Nb is a combined Nb+Ta limit; 800H/800HT differ from 800 in carbon, Al+Ti and grain-size control; age-hardening alloys (718, X-750, K-500, 925) reach their properties only after solution + ageing. "Balance" means the remainder after listed elements. Final chemistry is on the heat-wise MTC (laboratory analysis, not handheld PMI, for light/residual elements).
Grade Directory — UNS, EN & Standards
| Alloy | UNS | EN (comparison) | Typical standards | Full data |
|---|---|---|---|---|
| Nickel 200 / 201 | N02200 / N02201 | 2.4066 / 2.4068 | B161, B162, B163, B366 | Nickel 200/201 › |
| Monel 400 | N04400 | 2.4360 | B165, B164, B127, B366, B564 | Monel › |
| Monel K-500 | N05500 | 2.4375 | B865 (age-hardened) | Monel › |
| Inconel 600 / 601 | N06600 / N06601 | 2.4816 / 2.4851 | B167 (tube), B564, B366 | Inconel › |
| Inconel 625 | N06625 | 2.4856 | B444 pipe/tube (Gr 1/2), B705 welded, B446 bar, B564 | Inconel › |
| Inconel 718 / X-750 | N07718 / N07750 | 2.4668 / 2.4669 | B637 (age-hardened bar); AMS as required | Inconel › |
| Incoloy 800 | N08800 | 1.4876 | B407 pipe/tube, B408 bar, B409 plate, B564 | Incoloy › |
| Incoloy 800H | N08810 | 1.4958 | B407 (creep grade, grain size) | Incoloy › |
| Incoloy 800HT | N08811 | 1.4959 | B407 (creep grade, Al+Ti) | Incoloy › |
| Incoloy 825 / 925 | N08825 / N09925 | 2.4858 / — | B423 pipe/tube, B424 plate, B425 bar | Incoloy › |
| Hastelloy C-276 / C-22 | N10276 / N06022 | 2.4819 / 2.4602 | B622 seamless, B619 welded pipe, B626 welded tube, B574/B575 | Hastelloy › |
| Hastelloy B-2 / B-3 / X | N10665 / N10675 / N06002 | 2.4617 / 2.4600 / 2.4665 | B622/B619/B626; B435 (X sheet/plate) | Hastelloy › |
| Alloy 20 | N08020 | 2.4660 | B729 seamless, B464 welded pipe, B463 plate, B462 forgings | Alloy 20 › |
EN numbers are related designations for comparison, not exact replacements; the three 800 variants have different EN references (1.4876 / 1.4958 / 1.4959) and are not one entry. For 625, ASTM B444 distinguishes Grade 1 (annealed) from Grade 2 (solution-annealed) — properties differ. Flange material follows B564 for most alloys but Alloy 20 uses B462. Standards lists are indicative, not proof every current edition includes every alloy.
Mechanical Properties (annealed, specified minima)
| Alloy | Tensile min MPa | 0.2% yield min MPa | Elong. min % | Condition / basis |
|---|---|---|---|---|
| Inconel 600 | 550 | 240 | 30 | annealed (B167) |
| Inconel 601 | 550 | 205 | 30 | annealed |
| Inconel 625 | 827 (Gr 1) | 414 | 30 | B444 Gr 1 annealed (Gr 2 solution-annealed differs) |
| Incoloy 800 | 450 | 170 | 30 | annealed (B407) |
| Incoloy 800H | 450 | 170 | 30 | solution-annealed, coarse grain (creep grade) |
| Incoloy 825 | 586 | 241 | 30 | annealed (B423) |
| Monel 400 | 480 | 170 | 35 | annealed (B165) |
| Hastelloy C-276 | 690 | 283 | 40 | solution-annealed (B622) |
| Hastelloy C-22 | 690 | 310 | 45 | solution-annealed |
| Hastelloy B-2 / B-3 | 760 | 350 | 40 | solution-annealed |
| Alloy 20 | 551 | 241 | 30 | annealed (B729) |
Values are specified minima for the stated condition and product basis — not one universal "annealed, typical min." row. Cold-worked and aged products have their own tables; hardness limits, where specified, are per the standard. Elongation depends on specimen, gauge and orientation. Creep/stress-rupture and elevated-temperature strength (for 800H/800HT, 600/601, X, 625) are separate data, not room-temperature values.
Physical Properties (representative)
| Alloy | Density g/cm³ | Magnetic? | Basis |
|---|---|---|---|
| Nickel 200 | ≈ 8.89 | Ferromagnetic | producer reference |
| Monel 400 | ≈ 8.80 | weakly magnetic (Curie near ambient) | producer reference |
| Inconel 600 / 625 | ≈ 8.47 / 8.44 | non-magnetic | producer reference |
| Incoloy 800 / 825 | ≈ 7.94 / 8.14 | non-magnetic | producer reference |
| Hastelloy C-276 | ≈ 8.89 | non-magnetic | Haynes, room temperature |
| Hastelloy B-3 | ≈ 9.22 | non-magnetic | Haynes, room temperature |
Alloy-specific producer reference values, not acceptance limits — density ranges from about 7.9 (Fe-Ni-Cr) to 9.2 g/cm³ (Ni-Mo B-3), so do not use one density for all nickel alloys in weight estimates. "Generally non-magnetic" is not universal: commercial nickel is ferromagnetic and Monel 400 is weakly magnetic near ambient. Modulus, thermal expansion and conductivity are grade- and temperature-dependent — use a producer dataset.
Standards & Product Forms
| Product | Material / product specification (by alloy) | Separate dimensional basis |
|---|---|---|
| Seamless pipe | B444/B705 (625), B407 (800), B423 (825), B622 (C/B alloys), B729 (Alloy 20), B167 (600) | ASME B36.19/B36.10 as adopted; tolerances |
| Welded pipe | B705 (625), B514 (800), B464 (Alloy 20), B619 (C/B alloys) | Class, examination, dimensions |
| Tube (condenser / HX) | B163/B516/B704; B626 is welded tube, not pipe | OD × wall, min/nominal wall, tube tests |
| Butt-weld fittings | B366 (complete WP-designation, class, construction) | ASME B16.9; B16.25 ends |
| Forgings & flanges | B564 (most alloys); B462 for Alloy 20 | B16.5 (½–24") / B16.47 (26–60"); rating basis separate |
| Bar / plate | B446/B408/B425 bar; B443/B409/B424/B463 plate; B637 (age-hardened bar) | Section, condition, tests |
| Bolting | Finished-product standard, alloy, condition, diameter tests, threads | Bar certificate alone is not a bolt spec |
B626 is welded tube, not welded pipe; pipe uses B619/B705/B514/B464/B729 by alloy. Material specifications are not interchangeable — flanges are B564 for most alloys but B462 for Alloy 20. ASTM "A/B" and ASME "S" designations are not an automatic dual-certification claim. Check the current adopted edition (e.g. the historical Alloy 20 bar reference B473 was withdrawn in 2026 — confirm the accepted order basis).
Corrosion & Service Selection
| Family | Guidance |
|---|---|
| Ni-Cu (400/K-500) | Seawater, brine and hydrofluoric acid; avoid strongly oxidising conditions and aerated stagnant seawater crevices. |
| Ni-Cr-Mo (C-276/C-22) | Broad resistance to mixed oxidising + reducing acids and chlorides — the go-to for severe/variable environments. |
| Ni-Mo (B-2/B-3) | Excellent in non-oxidising acids (e.g. HCl) but attacked by oxidising contamination (ferric/cupric ions, aeration). Not interchangeable with C alloys. |
| Fe-Ni-Cr (825, Alloy 20) | Sulphuric/phosphoric acid and chloride pitting resistance for chemical processing; not a universal acid-proof choice. |
| High temperature (600/601, 800H/HT, X) | Separate oxidation from sulfidation/carburisation/metal-dusting, and from code allowable stress and creep life; no family-wide temperature range. |
| Sour service | Qualify to ISO 15156-3 for the exact environment, condition, cold work and hardness — the alloy name alone is not a certificate. |
Welding & Fabrication
| Item | Guidance |
|---|---|
| Filler selection | Choose a qualified filler for the alloy, joint, corrosion and strength needs — matching filler is not always correct (over-alloyed fillers are common for corrosion service and dissimilar joints). |
| Cleanliness | Nickel alloys are sensitive to sulphur, lead and other low-melting contaminants — clean joints and control marking/handling contamination. |
| Heat input / dilution | Control heat input, interpass temperature and dilution to avoid hot cracking and preserve corrosion/creep performance; avoid excessive weave. |
| Heat treatment | Alloy-specific — solid-solution alloys usually need no PWHT; PH alloys require the specified solution + age; there is no universal recipe. |
| Forming / machining | These alloys work-harden strongly; plan for higher forces, springback, annealing after deformation, rigid tooling and slow speeds. |
Applications & Grade Guidance
| Duty | Alloys commonly considered | Selection notes |
|---|---|---|
| Seawater / HF acid | Monel 400, K-500 | Avoid oxidising/aerated crevices; K-500 for strength (aged) |
| Severe mixed acids / chlorides | C-276, C-22, Alloy 59 | Broadest resistance; select by exact environment |
| Non-oxidising acids (HCl) | B-2, B-3 | Not for oxidising contamination |
| Sulphuric / phosphoric acid | Alloy 20, 825, 625 | Concentration/temperature-dependent |
| High-temperature furnace / heater | 600/601, 800H/800HT, X | Oxidation vs carburisation/sulfidation; creep life |
| High-strength / sour & downhole | 625, 718, 925, K-500 | Aged condition; ISO 15156-3 qualification |
Candidate alloys for enquiry — not substitutions or approvals. Selection is set by the specific environment, temperature and code, not by "nickel is best". Aerospace/nuclear use needs the applicable specification and traceability beyond a grade name.
Available Forms, Sizes & Dimensions
Supplied as seamless and welded pipe, condenser/heat-exchanger tube, butt weld and forged fittings, flanges, bar, wire and sheet/plate. Share alloy/UNS, product form, condition, NPS/OD, schedule or wall and standard for confirmation. For dimensional data see the Pipe Schedule Chart (nickel alloys have their own densities — see physical properties).
| Form | Size Range | Wall / Thickness | Standard (by alloy) |
|---|---|---|---|
| Seamless pipe | 1/8" – 24" NPS | Sch 5S–XXS | B444 / B407 / B423 / B622 / B729 |
| Welded pipe | 1/2" – 36" NPS | per class | B705 / B514 / B619 / B464 |
| Tube | by OD × wall | nominal / minimum | B163 / B626 (tube) |
| BW fittings | 1/2" – 24" | Sch / grade | ASME B16.9 / B366 |
| Flanges | 1/2" – 24" (B16.5); 26"+ (B16.47) | Class 150–2500 | B564 / B462 (Alloy 20) |
| Bar / plate | 6 – 250 mm / — | — | B446 / B637 bar; B443 / B463 plate |
Dimensional coverage is standard-based; confirmed supply range is stated with the quotation. Pipe (NPS/schedule) and tube (OD × wall) are separate; schedule and STD/XS/XXS are wall designations, not pressure ratings.
Frequently Asked Questions
How do 625 and 825 differ?
Inconel 625 is a high-strength nickel-chromium-molybdenum-niobium alloy for broad acid/chloride/sour and high-temperature service; Incoloy 825 is an iron-nickel-chromium-molybdenum-copper alloy aimed mainly at sulphuric/phosphoric acid and chloride pitting. Different base (Ni vs Fe-Ni), strength and cost — not substitutes.
How do 800, 800H and 800HT differ?
Same nominal Fe-Ni-Cr composition, but 800H and 800HT add controlled carbon, Al+Ti and grain-size requirements for creep service at high temperature; 800 (lower carbon) is for general and corrosion duty. They are separate UNS numbers (N08800/N08810/N08811).
Why can oxidising contamination be a problem for B-2/B-3?
The Ni-Mo B alloys excel in non-oxidising acids like HCl but have very little chromium, so oxidising contaminants (ferric/cupric ions, aeration, oxidising acids) can cause rapid attack. They are not interchangeable with the chromium-bearing C alloys.
Does the alloy name establish NACE / ISO 15156 compliance?
No. Sour-service acceptance depends on the specific environment, material condition, cold work, ageing and hardness qualified to ISO 15156-3 — not on the grade name alone.
Product Range
The nickel alloy range can be supplied with related pipes, tubes, butt weld fittings, forged fittings, flanges, bar and sheet/plate where required by the BOQ. Use the family links above for full grade-level data.
Applications
For dimensional references, see the Pipe Schedule & Fittings Guide. For related supply, review Pipes & Tubes, Butt Weld Fittings, Forged Fittings and Flanges. For austenitic and duplex options, see Stainless Steel and Duplex / Super Duplex.
Types of Products
| Type | Description |
|---|---|
| Pipes & Tubes | Seamless & welded pipe and condenser/heat-exchanger tube |
| Fittings | B366 butt weld and B564 forged fittings |
| Flanges | B564 / B462 forged flanges |
| Bar / Plate / Wire | Bar, plate and wire, subject to alloy and project availability |
Available Forms
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Frequently Asked Questions
What distinguishes nickel-base from Fe-Ni-Cr alloys and the branded families?
Nickel-base alloys have nickel as the majority element (e.g. Monel, Inconel 600/625, Hastelloy C). Iron-nickel-chromium alloys such as Incoloy 800/825 and Alloy 20 are iron-rich with high nickel. "Inconel", "Incoloy", "Monel", "Hastelloy" are trademarks, not ASTM grades — always identify the exact alloy and UNS number.
How do 625 and 825 differ, and why are they not substitutes?
Inconel 625 is a nickel-chromium-molybdenum-niobium alloy with high strength and broad acid/chloride/sour resistance; Incoloy 825 is an iron-nickel-chromium-molybdenum-copper alloy aimed mainly at sulphuric/phosphoric acid and chloride pitting. Different base metal, strength and cost — selected for different services.
How do 800, 800H and 800HT differ in composition and service?
They share the nominal Fe-Ni-Cr composition, but 800H and 800HT add controlled carbon, aluminium+titanium and grain-size requirements for creep strength at high temperature, while 800 (lower carbon) suits general and corrosion duty. They are separate UNS numbers — N08800, N08810 and N08811.
What is the difference between B444 Grade 1 and Grade 2 for alloy 625?
ASTM B444 distinguishes Grade 1 (annealed) from Grade 2 (solution-annealed) alloy 625, with different mechanical properties and intended service (Grade 2 for higher-temperature/creep use). Specify which grade is required — they are not interchangeable.
How do C-22 and C-276 compare for a specified environment?
Both are nickel-chromium-molybdenum alloys with broad resistance to mixed oxidising and reducing acids and chlorides. C-22 has higher chromium (better in oxidising conditions) while C-276 has higher molybdenum/tungsten (strong in reducing conditions). Selection depends on the specific environment; confirm with corrosion data.
Why can oxidising contamination be a problem for B-2 and B-3?
The nickel-molybdenum B alloys resist non-oxidising acids such as hydrochloric acid very well but contain almost no chromium, so oxidising contaminants (ferric or cupric ions, aeration, oxidising acids) can cause rapid attack. They are not interchangeable with the chromium-bearing C alloys.
How do Monel 400 and age-hardened K-500 differ?
Both are nickel-copper alloys for seawater and HF-acid service. Monel 400 is a solid-solution alloy; K-500 adds aluminium and titanium and is precipitation-hardened (solution-treated and aged) for much higher strength and hardness, at higher cost and with heat-treatment requirements.
Does the alloy name establish ISO 15156 / NACE compliance?
No. Sour-service acceptance depends on the specific environment, material condition, cold work, ageing and hardness qualified to ISO 15156-3 — the grade name alone is not a certificate.
Which specifications cover welded pipe versus welded tube?
They are separate specifications. For example, welded pipe uses B705 (625), B514 (800), B464 (Alloy 20) or B619 (C/B alloys), while welded tube uses B626, B704 or B516. B626 in particular is a welded-tube specification, not welded pipe.
Must nickel-alloy welds use matching filler or receive PWHT?
Not necessarily. Filler is chosen for the alloy, joint, corrosion and strength needs — over-alloyed fillers are often preferred for corrosion service and dissimilar joints. Solid-solution alloys usually need no PWHT; precipitation-hardening alloys require their specified solution-and-age treatment. There is no universal rule.
What can PMI and an MTC prove, and what requires other testing?
Positive Material Identification confirms major alloying elements, and the mill test certificate reports the heat's chemistry and mechanical results. Handheld PMI cannot verify heat treatment, condition, or light/residual elements (carbon, nitrogen, boron); those need laboratory analysis, hardness/mechanical tests and heat-treatment records.
What information is required for a technically complete RFQ?
State 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 destination. Availability and inspection scope are confirmed with the quotation.
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