Cast steel impellers are typically made from cast steel materials (mostly carbon steel or alloy steel), with the specific material selected based on medium temperature, corrosiveness, erosion conditions, and speed/strength requirements. Common materials include:
Common Cast Steel Impeller Materials (Typical Grades)
ZG (cast steel grade)/Cast Carbon Steel
ZG230-450 (approximately equivalent to commonly used medium-strength as-cast carbon steel)
ZG200-400 and other strength grades
(Suitable for general temperature conditions and non-severe corrosion environments)
Wear-resistant/High-strength Cast Steel
ZG340-480, ZG360-480, and other higher strength grades
(Suitable for conditions involving solid particles and significant erosion)
Stainless Cast Steel (Corrosion-resistant)
Common examples include CF8/CF8M (corresponding to 304/316 types), or cast stainless steels
selected according to standards with similar grades (Suitable for corrosive media)
Heat-resistant Steel / High-temperature Cast Steel
Typically heat-resistant alloy steel grades are selected (depending on specific temperature range and standard)
(Suitable for high-temperature steam, hot oil, etc.)
Key Factors in Material Selection
Medium: Water, steam, oil, acids/bases, seawater, concentration of solid particles
Temperature Range: Ambient or high temperature
Corrosion and Erosion: Presence of particle wear, abrasion intensity
Strength and Toughness Requirements: Rotational speed, dynamic balance, fatigue resistance
Standards and Acceptance Criteria: Company standards, ASME, EN, national standards, etc.