Ni-Cr-Mo-Nb alloy (Inconel 625)
Nickel-chromium alloy strengthened with molybdenum and niobium. Strength from cryogenic temperatures up to 980 °C and very high resistance in seawater and acids; also used as a weld overlay (cladding) material for valve seats and stems.
- Rp0.2 · MPa
- —
- Rm · MPa
- —
- TEMPERATURE
- −196 … +982 °C
- COST
Chemical composition
The values in this section are being verified.
Mechanical properties
The values in this section are being verified.
Service 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.
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
- Very high resistance to pitting and crevice corrosion in seawater
- Strength and oxidation resistance at high temperature
- Ideal for weld overlay (cladding)
Weaknesses
- Very expensive
- Difficult to machine
Manufacturing and use
- ECONOMY
- Very high.
- MANUFACTURING METHODS
- Fabrication from bar and forging · Weld overlay cladding
- TYPICAL VALVE PARTS
- Stem · Seat overlay · Body (extremely corrosive service)
Source: ASTM B446 / B443. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.