Why investment casting
Fittings, pump and valve parts for aggressive media are cast in superaustenitic, duplex and nickel-chromium-molybdenum alloys chosen for the medium.
Components
- Pump and valve wetted parts
- Mixer and agitator elements
- Spray nozzles
- Thermowells
Materials
CF3M, CN7M, 6 % Mo austenitics, duplex, Ni-Cr-Mo alloys.
Frequently used alloys
| Grade | Type | Standard |
|---|---|---|
| CF3M | Low-carbon Mo-bearing austenitic stainless steel, cast 316L type 316L type | ASTM A351/A351M, A743/A743M |
| CN7M | High-nickel austenitic alloy with Mo and Cu, cast Alloy 20 type Alloy 20 type (Carpenter 20Cb-3®, Durimet 20®) | ASTM A351/A351M, A743/A743M, A744/A744M |
| CW-12MW | Ni-Mo-Cr-W alloy, cast Alloy C type Hastelloy® C type (C-276 / C276 family) | ASTM A494/A494M |
| CX2MW | Ni-Cr-Mo-W alloy, low carbon, cast C-22 type Hastelloy® C-22 / C22 type | ASTM A494/A494M |
| CD3MN (4A) | 22Cr-5Ni-Mo-N duplex stainless steel 2205 type (Uranus® 45N, SAF 2205®) | ASTM A890/A890M, A995/A995M Gr. 4A |
| GX2NiCrMoCu25-20-5 (1.4584) | High-alloy austenitic stainless steel with Mo and Cu, cast 904L type 904L type (Uranus® B6) | EN 10283 |
Typical requirements
Alloy selection for the actual medium, concentration and temperature; corrosion tests and solution-anneal records are frequently specified.
- Solution annealing and corrosion testing
- Positive material identification
- Clear cast grade and standard
Related engineering topics
International equivalents
How to compare cast alloy designations across EN, DIN, ASTM, ASME, UNS, AISI, SAE, JIS, ISO and GB/T, and why similar grades are not automatically interchangeable.
Material testing
Verification of cast alloys: spectrometric chemical analysis, PMI, tensile, hardness and impact testing, metallography, ferrite measurement, corrosion tests and heat-treatment verification.
Documentation
Documentation for investment castings: EN 10204 inspection documents 2.1, 2.2, 3.1 and 3.2, material certificates, dimensional and NDT reports, heat-treatment records and traceability.