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Carbon Steel Investment Casting

High-strength castings from ISO 9001 certified lost-wax foundries. Carbon steel poured via lost-wax investment casting for buyers who need the strength and machinability of steel with the geometric freedom of the investment process. One U.S. engineering and QC team.

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Trusted by Programs across Tier 1 suppliers, Fortune 500 OEMs & hardware startups
  • Honda
  • Libman
  • Mahindra
  • Meyer
  • MIT
  • Amazon
  • Bloom Energy
  • Circor
  • Halliburton
  • Honda
Carbon Steel Investment Casting capabilities

Technical Capabilities

Review core carbon steel investment casting capabilities, materials, tolerances, inspection methods, and production requirements before requesting a quote.

Production envelope · Verified
Per-piece weight
01
10 g-140 kg
As-cast (CT5-CT7)
02
±0.005"
Quench, temper, anneal
03
Heat treated
Materials
Carbon steel: low-carbon, medium-carbon, and alloy carbon grades
Process
Lost-wax investment casting (expendable-pattern ceramic shell)
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See Our Process Or same-day technical feasibility review

Production specifications

Part weight range
10 g to 140 kg
Tolerances
Plus or minus 0.005 in as-cast (CT5 to CT7 per ISO 8062), plus or minus 0.002 in with CNC secondary
Surface finish
125 to 250 microinch Ra as-cast; shot blast, painting, or machined finish available
Heat treatment
Normalize, anneal, quench and temper, per customer specification
Certifications
ISO 9001, IATF 16949
Lead time
4-8 weeks from approved tooling; wax tooling 3 to 5 weeks

Production Process

01 DFM Review
02 Tooling
03 Trial Pours
04 Production
Next step

Ready for technical review?

Share your part details, drawings, or CAD files. Redstone will review the requirements and confirm feasibility, tolerances, materials, lead time, and next steps.

  • Feasibility review based on your drawing or CAD file
  • Material, tolerance, and production requirements confirmed
  • Quote reviewed within 24 hours
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Final specifications are confirmed during the technical feasibility review.

Why Redstone

Quality, cost, and a clear fit

Redstone helps hardware teams move from released drawings to repeat production with documented quality, competitive unit costs, and engineering support from the U.S.

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  • ISO 9001 certified facilities
  • U.S.-based engineering support
  • Direct manufacturing partner
Quality

Certified production with full material traceability

Every carbon steel casting ships with material certifications traceable to the heat. Foundries run under ISO 9001 quality systems with an IATF 16949 overlay. SPC, dimensional inspection, and third-party review are standard, not add-ons.

  • Material certs traceable to the heat on every order, no exceptions
  • ISO 9001 and IATF 16949 certified foundries run the same quality process at every volume
  • SPC, dimensional inspection, and third-party review included as standard
  • First-article approval gates every production run before units release
Cost

Steel strength at investment-cast landed cost

Carbon steel investment castings from Redstone certified foundries deliver meaningful savings versus domestic-only sourcing on comparable volumes. Buyers consolidate freight under one importer of record with predictable per-part landed cost from quote to delivery.

  • Lower landed cost versus domestic-only sourcing at comparable volumes
  • One importer of record, with HTS, duties, and customs handled by Redstone
  • Single consolidated freight lane from foundry to dock, no coordination overhead
  • Tooling amortized into per-part pricing, so landed cost is transparent from quote
Fit

Complex geometry in a machinable alloy

Investment casting lets carbon steel parts carry internal passages, undercuts, and thin walls that bar-stock machining cannot reach economically. The U.S. engineering team reviews your drawings for lost-wax DFM before tooling is cut, reducing first-article surprises.

  • Internal passages, undercuts, and thin walls achievable without expensive multi-op machining
  • CT5 to CT7 as-cast tolerances reduce secondary CNC versus sand-cast equivalents
  • U.S. DFM review flags wall-thickness and shrinkage risks before tooling is cut
  • Machinable alloy family, with CNC secondary to plus or minus 0.002 in available alongside the casting quote
Parts built for production

What we produce

Redstone supports production metal parts across automotive, electronics, industrial equipment, and consumer hardware programs.

Structural and load-bearing hardware

Structural and load-bearing hardware

Brackets, connectors, and housings where tensile strength is the primary specification driver.

Valves and pump bodies

Valves and pump bodies

Carbon steel valves and pump components where stainless corrosion resistance is not required and cost is a factor.

Agricultural and construction equipment

Agricultural and construction equipment

High-wear components that require strength without the cost premium of alloy steel.

Industrial machinery components

Industrial machinery components

Gears, levers, and linkages with complex geometry that investment casting delivers more economically than machined billet.

From quote to production

A five-step process, documented at every handoff

From initial drawings to final delivery, Redstone keeps each stage clear, documented, and aligned with production requirements.

Each handoff is documented. No stage moves forward until drawings, materials, and production requirements are confirmed with the customer.

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  1. 01

    Submit Drawings

    Send 2D prints or 3D CAD. The U.S. team reviews geometry for carbon steel investment casting DFM and flags wall-thickness and shrinkage risks before tooling is quoted.

  2. 02

    Quote and Tooling Approval

    Receive a landed-cost quote covering wax tooling, casting, heat treat, finishing, inspection, and freight. Approve the tooling design before production begins.

  3. 03

    Wax Pattern and Ceramic Shell

    Wax patterns are injected and assembled into trees. The ceramic shell is built up in layers. Process logs are maintained throughout.

  4. 04

    Pour and Knockout

    The shell is dewaxed, fired, and filled with molten carbon steel under controlled pour conditions. After solidification, the shell is knocked out and parts are cut and cleaned.

  5. 05

    Heat Treat, Inspection, and Delivery

    Post-pour heat treatment is applied to achieve the required mechanical properties. A dimensional report and material certs ship with the parts. The U.S. team handles customs clearance and delivery.

Industries

Industries that source carbon steel investment castings at Redstone

Redstone supports production carbon steel investment casting programs for OEMs and engineering-led teams that require repeatable quality, controlled costs, and reliable part production.

  • Automotive

    Automotive

    Production components for automotive Tier 1 and Tier 2 suppliers and specialty OEM programs, run to IATF 16949 in certified facilities with U.S. engineering oversight from quote through delivery.

    • You run automotive components at production volume, not one-off prototypes.
    • Your program needs IATF 16949 quality and audit-ready documentation.
    • You are a Tier 1 or Tier 2 supplier, or a smaller OEM program that wants production-grade quality without a large-OEM minimum-order gate.
  • Industrial Machinery

    Industrial Machinery

    Cast, machined, and fabricated components for industrial equipment programs, run to ISO 9001 with U.S. engineering oversight from quote through delivery.

    • You run cast, machined, or fabricated components at production volume, not one-off prototypes.
    • Your equipment operates in demanding service environments.
    • You want to consolidate multiple processes with one supplier and one U.S. point of contact.
  • Medical and Dental

    Medical and Dental

    Precision-machined components for medical device and instrument programs, run to ISO 9001 in certified facilities with material traceability and U.S. engineering oversight from quote through delivery.

    • You run precision machined components at production volume, not one-off prototypes.
    • Your program needs material traceability and audit-ready quality documentation.
    • You produce components for medical devices, instruments, or equipment, working from released drawings.
  • Energy

    Energy

    Production carbon steel investment casting components for energy programs, run to documented quality with U.S. engineering oversight.

    • Recurring production volume
    • Documented dimensional inspection
    • One U.S. point of contact
  • Consumer Hardware

    Consumer Hardware

    Production carbon steel investment casting components for consumer hardware programs, run to documented quality with U.S. engineering oversight.

    • Recurring production volume
    • Documented dimensional inspection
    • One U.S. point of contact
  • Oil and Gas

    Oil and Gas

    Production carbon steel investment casting components for oil and gas programs, run to documented quality with U.S. engineering oversight.

    • Recurring production volume
    • Documented dimensional inspection
    • One U.S. point of contact

Not sure if carbon steel investment casting fits your part?

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Related capabilities

Related capabilities

Additional manufacturing processes that can support die casting programs, secondary operations, and production-ready metal parts.

Die Casting

Die Casting

Aluminum and zinc die casting for high-volume, dimensionally precise components.

View capability
CNC Machining

CNC Machining

3, 4, and 5-axis milling and turning from ISO 9001 and IATF 16949 certified facilities.

View capability
Sheet Metal Fabrication

Sheet Metal Fabrication

Laser cutting, bending, stamping, and welding for precision sheet metal components.

View capability
Sand Casting

Sand Casting

Aluminum, iron, steel, and brass castings from low-volume runs to large production batches.

View capability

Need help choosing the right process?

Share your part requirements and Redstone can help determine the right manufacturing path.

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Final step

Ready to review your part?

Share your drawings, CAD files, or production requirements. Redstone will review feasibility, materials, tolerances, lead time, and the best manufacturing path for your program.

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  • ISO 9001 and IATF 16949 certified facilities
  • U.S.-based engineering support
  • Quote reviewed within 24 hours
  • Production support across Redstone’s facilities in the U.S., Mexico, and China
Resources

From the engineering desk

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Frequently asked questions

Don’t see your question? Request a quote and our engineering team will answer it.

Why use investment casting instead of sand casting for carbon steel?

Investment casting delivers tighter tolerances (CT5 to CT7 versus CT10 to CT13 for sand) and a finer surface finish as-cast. For smaller parts with complex geometry, investment casting reduces or eliminates secondary machining. Sand casting becomes the better fit for large, simpler parts where tolerances are relaxed.

What carbon steel grades are available?

Redstone foundries pour low-carbon, medium-carbon, and common alloy carbon grades. Specific grade selection is confirmed at RFQ based on your mechanical property and weldability requirements. Contact us with your drawing callouts for a grade recommendation.

Is heat treatment included?

Normalize and anneal are standard post-pour options. Quench-and-temper is available for applications requiring elevated hardness or tensile strength. Heat treatment is quoted alongside the casting.

What is the minimum order quantity?

500 units or $50,000 per order, whichever is greater.

Can I re-source from an existing domestic supplier?

Yes. Redstone handles drawing review, DFM feedback, and first-article qualification against your current print. If your existing part has tolerance callouts that investment casting can meet, the transition is straightforward. Share your drawings and the U.S. team will scope the project.