Vannes industrielles
Gamme de produits
Duplex and Super Duplex Valves
F51, F53, F55; seawater and chloride service; ferrite and G48 tests.
View detailsNickel Alloy Valves
Alloy 625, Alloy 400, Alloy C276, Nickel 200; acids, chlorine and high temperature.
View detailsAlloy groups and typical service
| Group | Typical grades | Service typique |
|---|---|---|
| Duplex / super duplex | F51, F53, F55; cast ASTM A995 4A, 5A, 6A | Seawater, chloride-bearing process water, offshore, lines requiring high strength |
| Nickel-chromium alloys | Alloy 600, Alloy 625 (Inconel) | High temperature, oxidizing and chloride environments |
| Nickel-copper alloys | Alloy 400, K-500 (Monel) | Hydrofluoric acid, seawater, alkaline environments |
| Nickel-molybdenum-chromium | Alloy C-276 (Hastelloy) | Strong acids, chlorine and mixed chemical environments |
| Pure nickel | Nickel 200 | Caustic (sodium hydroxide) service |
| Titanium | Gr. 2, Gr. 3, Gr. 5, Gr. 7, Gr. 12 | Seawater, chlorine dioxide, oxidizing acids |
| Zirconium | Zirconium alloys | Hot acids (e.g. sulfuric and hydrochloric at certain concentrations) |
| Nickel-aluminum bronze | C95800 | Seawater cooling and firewater systems |
| High-temperature steels | WC1, WC6, WC9, C5, C12A | Steam, superheated steam and high-temperature process lines |
| Low-temperature steels | LCB, LCC, LC1, LC2, LC3, LF2, LF3 | Sub-zero service (not cryogenic) |
| Other stainless steels | 321, 310, 904L | High-temperature oxidation, sulfuric acid environments |
For duplex grades see duplex and super duplex valves; for nickel alloys see nickel alloy valves.
Quality control for special alloy valves
- 100% PMI (positive material identification) to verify the alloy of every part
- EN 10204 3.1 certificates; 3.2 with independent inspection on request
- Ferrite content measurement and ASTM G48 pitting corrosion testing for duplex materials
- NACE MR0175 / ISO 15156 hardness and material compliance where the service requires it
- Non-destructive examination such as radiography (RT) and liquid penetrant testing (PT); the scope is stated in the offer
See our guides to EN 10204 3.1 and 3.2 material certificates et NACE MR0175 sour service.
Typical special alloy valves
Examples include Alloy 600 globe valves, Alloy 400 gate valves, Alloy C-276 knife gate and globe valves, NAB C95800 gate valves and Alloy 625 triple-offset butterfly valves, sourced through our manufacturer network. Depending on the fluid and service, the whole valve can be made in the alloy, only the wetted parts (ball, disc, seat, stem) can be alloyed, or a carbon steel body can be overlaid with the alloy; the choice weighs corrosion rate, safety and cost.
At a glance
| Valve types | Ball, gate, globe, check, butterfly and knife gate valves |
|---|---|
| Alloy groups | Duplex and super duplex, super austenitic (6Mo), Alloy 20, nickel alloys, titanium, zirconium, nickel-aluminum bronze |
| Product forms | Cast or forged body, bonnet and internals; alloy wetted parts or overlay as an option |
| Inspection | 100% PMI; EN 10204 3.1, 3.2 on request; ferrite measurement and ASTM G48 for duplex |
| Sour service | NACE MR0175 / ISO 15156 where required |
Material program
Body, bonnet and internal parts can be produced as castings or forgings in the alloys below. Material is selected by fluid, concentration, temperature and chloride content; for alloy materials, 100% PMI and EN 10204 3.1 certificates are standard.
| Alloy group | Cast (ASTM) | Forged / bar (UNS) | Service typique |
|---|---|---|---|
| Duplex stainless | A995 4A (CD3MN) | A182 F51 (S31803), F60 (S32205) | Chloride-bearing water, sour service; seawater depending on conditions |
| Super duplex | A995 5A (CE3MN), 6A (CD3MWCuN) | A182 F53 (S32750), F55 (S32760) | Seawater, high chloride, pressurized lines |
| Super austenitic | A351 CK3MCuN (6Mo) | S31254 (6Mo), N08904 (904L) | Seawater, chloride-bearing process fluids |
| Alloy 20 | A351 CN7M | B462 N08020 | Sulfuric acid |
| Ni-Cu (Monel 400 / K-500) | A494 M35-1 | N04400, N05500 | Hydrofluoric acid, seawater, brine solutions |
| Ni-Cr-Mo (Inconel 625) | A494 CW6MC | N06625 | High temperature, chloride and acid mixtures |
| Ni-Mo-Cr (Hastelloy C-276 / C-22) | A494 CW12MW, CX2MW | N10276, N06022 | Wet chlorine, hypochlorite, mixed acids |
| Ni-Fe-Cr (Incoloy 800H / 825) | n/a | N08810, N08825 | High temperature, phosphoric and sulfuric acid |
| Pure nickel | n/a | Ni 200 / 201 (N02200 / N02201) | Caustic (NaOH) service |
| Titanium | B367 (Gr. C-2, C-3, C-5, C-12) | Gr. 2, 3, 5, 7, 12 (B381 / B348) | Seawater, chlorinated media, oxidizing acids |
| Zirconium | n/a | Zr 702, 705 | Hot acids (e.g. acetic and formic acid processes) |
| Nickel-aluminum bronze | B148 C95800 | n/a | Seawater, shipboard systems |
Standard materials
| Group | Cast (ASTM) | Forged (ASTM) |
|---|---|---|
| acier au carbone | A216 WCB, WCC | A105N |
| Low temperature | A352 LCB, LCC, LC1, LC2, LC3 | A350 LF2, LF3 |
| High temperature (Cr-Mo) | A217 WC1, WC6, WC9, C5, C12A | A182 F11, F22, F5, F9, F91 |
| Stainless | A351 CF8, CF8M, CF3, CF3M; A217 CA15 (13Cr martensitic) | A182 F304, F316, F304L, F316L, F321; F6a (13Cr) |
Documentation and testing
On industrial projects the documentation package matters as much as the valve. We confirm the certificate and test scope for every line item at quotation stage:
- EN 10204 3.1 material certificates for pressure-retaining and wetted parts, traceable by heat number
- EN 10204 3.2 with third-party inspection, on request
- Pressure test reports to API 598 or EN 12266-1: shell, seat and, where specified, gas tests
- Fire-test certificates (API 607 / ISO 10497) for fire-safe type-tested designs
- PMI reports for alloy and stainless materials
- Dimensional, visual and coating inspection records
- PED 2014/68/EU CE declaration for equipment within its scope
- NACE MR0175 / ISO 15156 compliance statement for sour (H₂S) service
Technical datasheets
- PDFDuplex and Super Duplex ValvesPDF · English · 2–3 pages
- PDFNickel Alloy ValvesPDF · English · 2–3 pages
Foire aux questions
When is a duplex stainless steel valve required?
In chloride-bearing water, 316 stainless steel can suffer pitting and stress corrosion cracking. Duplex (F51) and super duplex (F53 / F55) steels offer both higher corrosion resistance and roughly twice the yield strength, so they are preferred for brine and offshore applications, with super duplex the usual choice for seawater.
Why is PMI important for special alloy valves?
Alloys that look alike can be mixed up, and a mix-up can cause severe corrosion damage. PMI (positive material identification) uses a portable spectrometer to verify the actual composition of each part and compares it with the certificate.
What is the difference between Inconel, Monel and Hastelloy?
All three are nickel-based. Inconel (for example Alloy 625) is nickel-chromium based and performs well at high temperature and in oxidizing media. Monel (Alloy 400) is nickel-copper based and performs well in hydrofluoric acid and seawater. Hastelloy C-276 is nickel-molybdenum-chromium based and offers the broadest resistance of the three to strong acids and mixed chemicals.
Related categories
Vannes en acier inoxydable
CF8 (304) and CF8M (316) threaded and flanged ball valves, API 603 gate valves and duplex F51 / F55 options.
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Vannes à bille
Floating and trunnion ball valves to API 6D / ISO 17292, API 607 fire-safe; ½”–60″, Class 150–2500.
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Cast Steel Gate & Globe Valves
API 600, pressure seal and API 6D slab gate valves; BS 1873, bellows seal and angle globe valves.
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Vannes papillon industrielles
Triple-offset metal-seated, double-offset high-performance and rubber-lined butterfly valves; API 609 / EN 593.
View detailsRequest a quote: Special Alloy Valves
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