CustomPartNet
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July 13, 2026
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Updated July 16, 2026
Start by narrowing your supplier list to those that match your specific requirements, such as material capability or required certifications. Factors like location can also have an impact on your shipping fee and lead time. Selecting the right supplier can be as important as the design of the part itself, especially for larger volumes or long-term collaborations. It can also be helpful to compare sample parts with your project to determine if the supplier is the right fit. Not only are they physical proof of the supplier's capabilities, they are also a great visual indicator of what to expect, which can often be more helpful than numbers. Browse our supplier network on the right to compare qualified suppliers, examine sample parts, and request quotes.
Sand casting is one of the most widely used metal casting processes due to its versatility. The process uses expendable sand molds to form parts, giving designers more freedom with the geometry. Sand casted parts can also be made from nearly any alloy, including high-melting-point metals like steel, which other casting methods struggle to handle.
The process starts with mold-making. A special mixture of sand is packed around a pattern, essentially a replica of the part, often made of wood or plastic. Once the pattern is removed, the cavity that remains will shape the casting. Any internal features, like passages or holes, are formed separately using sand cores that get positioned inside the mold before it's closed.
After the mold is dried and preheated, it’s then clamped shut for the casting step. Molten steel is poured from the furnace into the cavity, filling all channels quickly to avoid premature solidification. The metal is then left to cool and solidify, which can take many hours depending on wall thickness and pour temperature.
Once cooling is complete, the sand mold is broken away in a step called shakeout, and the casting is extracted. From there, any excess material from the channels is trimmed off, and the part often goes through a surface finishing step like shot blasting to remove any leftover sand and clean up the surface.
Because the mold itself is destroyed to free the part, sand casting has a lower production rate than processes like die casting, and is therefore more suited for low to medium production volumes. That said, it more than makes up for it in geometry flexibility, possible part sizes, and material options.
Steel is a go-to material for automotive sand casting because it offers:
High strength and durability under heavy load
Excellent wear resistance for moving components
Good machinability after casting
Ability to withstand high operating temperatures
Cost-effectiveness for large, structural components
Compatibility with a wide range of heat treatments
Long service life in demanding automotive environments
Steel's melting point, around 2500°F, is high enough that many other casting processes simply aren't practical for it. Sand casting handles this without issue, since the sand mold and cores can tolerate the heat that molten steel requires.
The pattern is the primary piece of tooling in sand casting, and it's made slightly larger than the finished part to account for shrinkage as the steel cools.
Tooling costs and pattern selection depend on:
Production quantity
Part complexity and geometry
Number of cores required
Pattern material (wood, plastic, or metal)
Whether the process will be automated
Automotive components often call for match-plate or cope-and-drag patterns, since these support the higher production volumes and automated processes common in the industry. Wood patterns are common for lower-volume or prototype runs, while metal patterns hold up better over long production cycles and higher part counts.
Steel sand casting is a mainstay of automotive manufacturing, used to produce:
Engine blocks
Cylinder heads
Exhaust manifolds
Transmission cases
Differential housings
Brake components
Suspension parts
Axle housings
Steering knuckles
Chassis and frame components
Michigan suppliers support both prototype and production programs for OEMs, Tier 1 and Tier 2 suppliers, and contract manufacturers throughout the automotive supply chain.
Steel offers the strength, wear resistance, and durability needed for structural and high-load automotive components. It also machines well after casting and can handle the heat treatments many automotive parts require.
Costs are driven by material weight, pattern and core-box tooling, and production volume. Pattern cost depends largely on part size and complexity, while material cost scales with the weight of the casting. Larger production runs help spread tooling costs over more parts, lowering the per-part price.
As-cast steel parts typically have a rougher surface than die cast or injection molded parts, since sand casting isn't designed for cosmetic finishes. Most automotive steel castings are machined afterward at critical surfaces to meet dimensional and finish requirements.
Sand casting generally holds looser tolerances than other processes due to the nature of the sand mold. Machining allowances of roughly 0.0625 to 0.25 inches are typically added to dimensions that require tighter control, with final tolerances achieved through secondary machining.
Common defects include porosity, shrinkage, hot tearing, and unfilled sections, most of which stem from uneven cooling or insufficient pouring temperature. Reputable suppliers use design rules like uniform wall thickness and proper draft angles to minimize these issues.
Yes. Many Michigan suppliers offer full program support, from pattern design and prototyping through pilot runs, full-scale production, machining, and assembly.
Sand casting works well across a wide volume range, from low-volume prototype runs using simple wood patterns to higher-volume production using match-plate or cope-and-drag patterns on automated equipment.
Get competitive quotes from Michigan sand casting suppliers experienced with steel automotive components. Upload a CAD file, drawing, or product concept and receive quotes from qualified suppliers matched to your project requirements.
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