Ductile (spheroidal graphite) cast iron
Ferritic-pearlitic spheroidal graphite cast iron; higher strength but lower ductility than GGG-40. For higher pressure class cast iron bodies and wear-exposed parts.
- Rp0.2 · MPa
- ≥ 320
- Rm · MPa
- ≥ 500
- TEMPERATURE
- −10 … +300 °C
- COST
Chemical composition
EN 1563 does not specify a chemical composition.
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 1563 · t ≤ 30 mm | 320 | — | ≥ 500 | 7 | — |
| EN 1563 · 30 < t ≤ 60 mm | 300 | — | ≥ 450 | 7 | — |
| EN 1563 · 60 < t ≤ 200 mm | 290 | — | ≥ 420 | 5 | — |
Separately cast sample, minimum values for the relevant wall thickness. Hardness 150–230 HBW.
Service temperature
The EN 1092-2 value could not be obtained; taken conservatively from GGG40. Less ductile, with no impact guarantee at low temperature.
This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.
Physical properties and heat treatment
- DENSITY
- 7.1 g/cm³
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- About 25% higher strength than GGG-40
- Good wear resistance
- Economical
Weaknesses
- Low ductility (A ≥ 7%)
- Limited under impact and at low temperature
Manufacturing and use
- ECONOMY
- Low.
- MANUFACTURING METHODS
- Sand casting
- TYPICAL VALVE PARTS
- Body · Bonnet · Disc
Surface protection
- Wet paintIndustrial wet paint systemEmsal standard · traffic blue
- Epoxy powder coatingElectrostatic epoxy powder coating (oven-cured, FBE)Water lines, internal and external ≥ 250 µm
Used in 2 Emsal products
- 130Flanged gate valveBody · Bonnet · Gate
- 131Knife gate valveBody
Source: EN 1563. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.