A photo of a cast iron part produced by Seneca Foundry in Webster City IowaSeneca Foundry Pours a Large Selection of Gray & Ductile Iron

With over 100 years of experience, Seneca is one of the most experienced foundries in Iowa. Our 3D scanning services and metal casting services provide our customers with unmatched customer service. Our high-quality, custom castings are available in flexible volumes to meet each customer's specific needs. 

Offering green sand molding and nobake molding, Seneca Foundry can produce castings weighing from ounces up to 250 pounds. Although capable of doing high-volume jobs, our niche is in low-volume orders from 1 to 1,000 pieces. We form a partnership with every customer to identify the casting processes best suited to meet their needs. 

Castings produced at Seneca Foundry are made according to ASTM Standards: 

  • Gray Iron - ASTM A48
  • Ductile Iron - ASTM A536
  • High-Silicon Molybdenum Iron - ASTM A1095

Tolerances are based on ISO 8062-3:2007. 

Castings manufactured with the green sand method can be expected to have a surface finish of 560-900 RMS.

Gray Iron Castings:

CL30 Up-close photo of Ductile Iron produced at Seneca Foundry.

Ductile Iron Castings:


120-90-02 Quench and temper

Austempered Ductile Iron (ADI):

Grades I to V

High Silicon Molybdenum Ductile Iron:

Several grades

When looking for a ductile and/or gray iron foundry to complete your job, choose a foundry you can trust. We’ve done thousands of jobs, big and small, for a wide variety of industries. Our experience, commitment, and top-of-the-line equipment set Seneca apart from every other foundry in Iowa.

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