Duplex & Super Duplex Castings
Pump casings, impellers, covers and valve bodies in duplex (1.4470) and super duplex (1.4469), cast in sand, solution-annealed and machined within our own group, from 0.5 kg up to 3 t. For seawater, desalination, chemical and process duties.
Grades we cast
| Grade (EN) | ASTM A890 | PREN (typical) | Typical use |
|---|---|---|---|
| 1.4470 · GX2CrNiMoN22-5-3 | ≈ 4A · CD3MN | ≈ 35 | Seawater and process pumps, valves |
| 1.4469 · GX2CrNiMoN26-7-4 | ≈ 5A · CE3MN | ≥ 40 | Seawater, desalination, offshore |
| 1.4517 · GX2CrNiMoCuN25-6-3-3 | ≈ 1B · CD4MCuN | ≈ 38 | Corrosive and abrasive slurries, chemical plants |
| CD3MWCuN | 6A | ≥ 40 | Seawater and offshore service |
Other grades to your specification. Full chemical composition in our alloy library.
What you get
- Sand castings from 0.5 kg up to 3 t, from a single piece to series
- Solution annealing and water quenching in our foundry
- Chemical analysis of every heat, tensile and hardness tests
- Ultrasonic and dye penetrant testing by Level II certified staff
- CNC machining in our own machine shop, ready to assemble
- EN 10204 3.1 certificate with every delivery
- Ferrite content, impact test and ASTM A923 / G48 corrosion tests on request
Typical parts
- Pump casings and impellers
- Covers, wear rings and bushes
- Valve bodies
- Seawater parts for ships and offshore
See it made
Frequently Asked Questions
What is the difference between duplex and super duplex?
Super duplex contains more chromium, molybdenum and nitrogen, with a PREN of 40 or more, for seawater and chloride service. Standard duplex, with a PREN of about 35, suits most process and water duties. We cast both.
Which duplex grades do you cast?
EN 1.4470, 1.4469 and 1.4517 and ASTM A890 grades 1B, 4A, 5A and 6A, as well as other grades to your specification.
Do you machine and test duplex castings?
Yes. Solution annealing in our foundry, chemical analysis of every heat, tensile and hardness tests, ultrasonic and dye penetrant testing by Level II staff, and CNC machining in our own machine shop, with an EN 10204 3.1 certificate.