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Custom Carbon Steel Fabrication & Manufacturing Services - Custom Metal Fabrication Project Portfolio

Pen Manufacturing provides custom carbon steel fabrication and carbon steel manufacturing services for OEMs, engineers, and procurement teams across the United States. From our AS9100- and ISO 9001-certified facility in Anaheim, California, we machine, form, weld, finish, and assemble carbon steel components for prototype, low-volume, and high-volume production.

Carbon Steel is a tried and true form of metal that we strive for excellence in. By working hand and hand with project designers we have found a way to become top experts in our field. As the top manufacturing company in our region it is safe to say that we provide excellent and creative solutions to any project we accept.

Three decades of shop-floor experience stand behind that claim. Ready to see it applied to your part? Get a Quote and upload your CAD files today.

What Is Carbon Steel Fabrication?

Carbon steel fabrication is the process of cutting, forming, machining, and welding carbon steel — an iron alloy strengthened primarily with carbon — into finished parts and structures. Valued for its strength, weldability, and low cost, carbon steel is the workhorse material of construction, heavy equipment, agriculture, energy, and industrial machinery.

Our carbon steel manufacturing happens entirely under one roof: machining, forming, welding, powder coating, and assembly. One accountable partner, tighter tolerances between operations, and shorter lead times for your program.

Carbon Steel Enclosures & Housings

Carbon steel enclosures deliver the impact resistance and rigidity that industrial environments demand — at a significantly lower material cost than stainless steel. We fabricate custom carbon steel enclosures, control cabinets, equipment housings, machine guards, and panels to your specifications.

Because bare carbon steel will corrode, protection is part of the design conversation from day one. Our in-house powder coating seals and finishes enclosures in a single facility, so parts are protected. And when your environment genuinely calls for stainless, we'll tell you — the right material costs less than the wrong one twice.

Frequently Asked Questions

Carbon steel offers higher strength per dollar and excellent weldability, but it corrodes without a protective finish. Stainless steel resists corrosion inherently thanks to its chromium content, at a higher material cost. For most industrial parts, powder-coated carbon steel delivers the required durability at a fraction of the price; choose stainless when chemicals, washdown, or hygiene demand it.

Yes. We build carbon steel enclosures, control cabinets, equipment housings, and machine guards to customer specifications, then powder coat them in-house for corrosion protection and a finished appearance. Prototype quantities through high-volume production runs are supported from the same Anaheim, California facility under the same quality system.

Low-carbon (mild) steels such as A36 and 1018 are the default for fabricated and welded parts — economical, formable, and easy to weld. Medium-carbon grades like 1045 add strength and hardness for shafts and machinery components. Send us your drawings and load conditions, and our engineers will confirm the most cost-effective specification.

Our shop runs Hurco 4-axis vertical mills (up to a 50" x 26" x 24" envelope), a vertical turret lathe with 54" capacity, multiple engine lathes, six MIG and TIG welding stations, a 90-ton ironworker, automated saws, and a 3-ton bridge crane — enough capacity for oversized parts and production volume alike.

Protection starts at design. We powder coat carbon steel components in-house, sealing surfaces against moisture and corrosion while adding impact and chemical resistance. Because coating happens in the same facility as fabrication, parts are protected before they ship — no bare-steel transit between vendors, no added lead time.

Yes. Front-end engineering is step one of our process: our team works hand in hand with your designers, extracting critical dimensions, defining quality metrics, and using 3D modeling and prototyping to resolve manufacturability issues before production. The result is fewer surprises, fewer revisions, and a part that hits cost targets.