Ductile cast iron, low temperature
Fully ferritic spheroidal graphite cast iron with guaranteed impact energy at −20 °C. Used instead of GGG-40 for valves working outdoors in cold climates and exposed to water hammer.
- Rp0.2 · MPa
- ≥ 240
- Rm · MPa
- ≥ 400
- TEMPERATURE
- −20 … +350 °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 | 240 | — | ≥ 400 | 18 | 12 (−20 °C) |
| EN 1563 · 30 < t ≤ 60 mm | 230 | — | ≥ 380 | 15 | — |
| EN 1563 · 60 < t ≤ 200 mm | 220 | — | ≥ 360 | 12 | — |
Service temperature
Lower value: the temperature of the EN 1563 impact requirement (−20 °C). Upper limit: the EN 1092-2 value for the same family (350 °C).
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.
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
- Impact guarantee at −20 °C
- Higher ductility than GJS-400-15 (A ≥ 18%)
- Resistant to water hammer
Weaknesses
- A difficult grade for foundries: the fully ferritic structure and impact value are often missed
- Requires coating for corrosion protection
Manufacturing and use
- ECONOMY
- Low; slightly more expensive than GJS-400-15.
- MANUFACTURING METHODS
- Sand casting + ferritizing anneal (if needed)
- TYPICAL VALVE PARTS
- Body · Cover · Disc (butterfly)
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 18 Emsal products
- 001Wafer check valveBody
- 003Dual plate check valveBody
- 005Short pattern swing check valveBody
- 011Foot valveBody · Bonnet · Disc
- 030Flanged Y-strainerBody · Bonnet
- 033Flanged T-strainerBody · Bonnet
- 050Flanged sight flow indicatorBody
- 051Threaded sight flow indicatorBody
- 070Flanged 2-piece ball valveBody · Bonnet
- 071Flanged 3-piece ball valveBody · Bonnet
- 079Threaded 3-piece ball valveBody · Bonnet
- 110Wafer butterfly valveBody
- 111Lug butterfly valveBody
- 130Flanged gate valveBody · Bonnet · Gate
- 131Knife gate valveBody
- 250Full lift flanged safety valveBody · Cover · Top cover · Retaining disc · Spring retainer
- 424Hydraulic actuatorBody
- 902Manual gear operatorBody
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.