Materials and surface treatment
Materials
The following materials are used for CONEXA products:
| CONEXA Precision Fittings | Steel | Stainless steel |
|---|---|---|
| Barstock | 11SMn30 (1.0715) 11SMnPb30 (1.0718) | X6CrNiMoTi17-12-2 (1.4571) |
| Form forgings | C35 (1.0501), C45 (1.0503) | X6CrNiMoTi17-12-2 (1.4571) |
| CONEXA Weld Nipple Fittings | Steel | Stainless steel |
|---|---|---|
| Barstock | C15 (1.0401), C22 (1.0402) | X6CrNiMoTi17-12-2 (1.4571) |
| Form forgings | C15 (1.0401), C22 (1.0402) | X6CrNiMoTi17-12-2 (1.4571) |
| CONEXA Elastomeric seals | For steel fittings | For stainless steel fittings |
|---|---|---|
| O-Rings | NBR (Standard) FKM (optional) | FKM (Standard) |
| Elastomeric seals | NBR (Standard) FKM (optional) | FKM (Standard) |
Coating
The general properties of the material of stainless steel fittings make these resistant to atmospheric attack as well as any inorganic and organic medium (see Fluid Compatibility).
Tube fittings made of steel must be protected against erosive corrosion and pitting corrosion by means of a sophisticated coating.
Steel fittings from CONEXA are
- zinc coated by galvanization
- Thick-film passivated Cr(VI)-free
- coated with an additional nano-protection
The resistance of CONEXA fittings in salt spray tests in accordance with ISO 9227 has an average value of:
- Resistance in terms of white rust > 250 h
- Resistance in terms of red rust > 500 h
The Cr(VI)-free passivation of CONEXA products is non-harmful to the environment and complies with the EU-regulation 2000/52/EC.
All steel welding fittings are shipped with a phosphate conversion coating.