Carbon Steel Fabrication · Miami Gardens, Florida

Carbon Steel Fabrication

Cold rolled and hot rolled carbon steel is the material we run most. We laser cut it from light gauge to 1 in. plate, punch it, form it on nine Amada press brakes, weld it to AWS D1.1 and deliver it powder coated, painted or plated.

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Cold Rolled · Hot Rolled · A36|Laser Cut to 1 in.|AWS D1.1 Welding|Powder Coat · Paint · Plating|AS9100 Rev D

Overview

Carbon Steel, Sheet Through Plate

Carbon steel is strong, inexpensive, easy to weld and takes almost any finish, which is why most enclosures, cabinets, brackets, frames and machine bases start as steel sheet or plate. It is our highest-volume material and is on the floor every day.

MJM cuts, forms, welds, machines and finishes steel parts under one AS9100 Rev D and ISO 9001:2015 quality system, from one prototype to production releases. For cutting detail see carbon steel laser cutting.

Materials

Steel We Fabricate

Material	Where It Is Used
Cold rolled steel (CRS)	Tighter thickness tolerance and a smooth surface. Enclosures, panels, brackets, rack and chassis parts that will be powder coated, painted or plated.
Hot rolled steel (HRS) and A36 plate	Heavier gauges and plate for frames, bases, mounting plates and structural weldments.
Hot rolled pickled and oiled (HRPO)	Scale-free hot rolled sheet for formed and welded parts that will be coated.
Galvanized and galvanneal	Zinc-coated steel for outdoor and painted parts. See galvanized and galvanneal fabrication.

Common gauges run from 22 gauge (0.030 in.) through 16, 14 and 11 gauge to 3/16, 1/4 and 1/2 in. plate, with laser capacity to 1 in. in mild steel. All material is US-sourced with mill certifications.

Processes

How We Fabricate Steel

Laser Cutting

Five amada lasers (one ventis 4 kw fiber, three ensis 3 kw fiber and one co2) on 5 x 10 ft tables. Oxygen assist for speed on plate; nitrogen assist for clean, oxide-free edges that weld and coat well. Tolerance ±0.005 in.

CNC Punching

Amada AE 2610NT turret punch to 1/4 in. mild steel for hole patterns, louvers, embosses and knockouts. CNC punching.

Forming and Rolling

Nine Amada press brakes, the largest 240 tons and 14 ft; three plate rollers to 7 ft. Forming.

Welding

MIG and TIG to AWS D1.1 (structural steel) and AWS D9.1M (sheet metal), fiber laser welding for thin sheet and resistance spot welding for assemblies. Welding services.

Machining and Tapping

Milled features, bores and tapped holes up to about 1 in. on plate and weldments. CNC machining.

Finishing

Wet deburring, then powder coat, paint, zinc or other plating, and laser marking. Finishing.

What We Build

Steel Parts and Assemblies

Enclosures and cabinets: electrical boxes, control cabinets and 19-inch racks. See electrical enclosure fabrication.
Chassis and panels: power supply chassis, covers, doors and perforated panels.
Brackets and plates: mounting brackets, gussets, base plates, clamps and laser-cut plate parts to 1 in.
Weldments: frames, stands, carts, machine bases and guards.
Kiosks and equipment housings for self-service, energy and transportation customers.

Design Notes

Design Tips for Steel Parts

Pick CRS for cosmetic and precision sheet metal, HRS or A36 for thick structural parts. Mill scale on hot rolled must come off before coating.
Tell us if edges will be welded or coated. That decides oxygen or nitrogen cutting.
Allow for coating thickness on hole sizes, threads and mating faces, and mark what must be masked.
Consider galvanneal for painted outdoor parts; it holds paint and powder better than bare cold rolled steel and resists corrosion at scratches.

Where MJM Is Not the Right Fit

We are not a structural steel erector. Building beams, columns, stairs and anything welded in the field belong with a structural fabricator, and steel plate over 1 in. is beyond our lasers.

We are the right shop for precision steel sheet and plate parts and weldments that need accurate cutting, forming, welding and a finished surface.

FAQ

Carbon Steel Fabrication Questions

What types of steel does MJM fabricate?

MJM fabricates cold rolled steel, hot rolled steel, A36 plate, hot rolled pickled and oiled sheet, galvanized and galvanneal steel, with US-sourced material and mill certifications.

How thick can MJM laser cut steel?

Mild steel up to 1 in. on Amada fiber lasers, at a typical tolerance of ±0.005 in.

Does MJM weld structural steel?

MJM welds carbon steel frames, bases and plate assemblies to AWS D1.1, the Structural Welding Code for Steel, and sheet metal to AWS D9.1M. MJM is not a structural steel erector and does not do field welding.

What is the difference between cold rolled and hot rolled steel?

Cold rolled steel is finished at room temperature, giving tighter thickness tolerance and a smooth surface for precision sheet metal. Hot rolled steel is produced at high temperature, comes in heavier thicknesses and has mill scale; it is used for structural parts.

Can steel parts be delivered powder coated?

Yes. MJM delivers steel parts powder coated, painted or plated, with hardware installed and assembled if required.

Is there a minimum order for steel fabrication?

No. MJM builds single prototypes through production quantities and returns quotes in 24 to 48 hours.

Carbon Steel Laser Cutting: gauges, oxygen vs nitrogen assist.
Galvanized and Galvanneal Fabrication: zinc-coated steel for outdoor and painted parts.
Stainless Steel Fabrication: 304 and 316 cut, formed, welded and finished.
Aluminum Fabrication: 5052 and 6061 cut, formed, welded and finished.
Welding Services: fiber laser, TIG, MIG and spot welding to AWS D17.1, D1.1, D1.2 and D9.1M.
Electrical Enclosure Fabrication: NEMA-type boxes, cabinets and panels built to print.
Custom Metal Fabrication: the full shop under one roof.

Send Us Your Steel Drawings

STEP files and PDF drawings to sales@mjmmfg.com or (305) 620-2020. Quotes in 24 to 48 hours.

Request a Quote Contact Us

Ronald Travieso

Working with MJM Manufacturing has been one of the best vendor experiences I've had. The parts matched my samples perfectly, and even the packing was done with real care — clean, organized, and professional. Of all the vendors I've worked with, they're by far the most organized and quality-focused. Great communication from start to finish. Highly recommend them for custom fabrication work.

Robert Cooler

MJM is wonderful to deal with. They have worked diligently and have produced my projects thus far to the highest standards.

Israel Schechter

I have been ordering parts from MJM Manufacturing for many years, and they have consistently exceeded my expectations. Their quality, professionalism, and attention to detail are outstanding. Every order is handled efficiently, delivered on time, and manufactured to the highest standards. The team at MJM is knowledgeable, responsive, and always willing to go the extra mile to ensure customer satisfaction. It is rare to find a company that maintains such a high level of consistency over many years. I highly recommend MJM Manufacturing to anyone looking for a reliable partner for complex, precision sheet metal parts and assemblies. I. Schechter, Former President of GBI Intralogistics Solutions, Current Owner/President of IPSTEC, Aventura, Florida

Richard Havass

As a customer, I have been working with MJM Manufacturing for approximately 35 years. The expertise of Mike Mijares and his team at MJM is top notch. Whenever I have a new part design, I typically review the design of the part with MJM to ensure that I am using the most cost-efficient manufacturing process to produce the parts as economically as possible. There was a part that we had made years ago using a progressive die to emboss a curved channel into a sheet metal part. The cost of the progressive die for this part was $55K. The redesign of the part from MJM consisted of $1200 in tooling to make the new part profile. Parts came out great and saved tens of thousands in tooling. Lastly, whether MJM produces a prototype or a production run, the appearance of the part is pristine, no tool marks or scratches on any part. In the 35 years that I have worked with Mike and his team, I have found them to be one big family. Mike’s love for his business is refreshing! You rarely see a person that is so charged to get up for work every day! Richard Havass Mechanical Engineering Manager JCI-Sensormatic

Sulen Ojeda Fuentes

Esta fábrica está llena de muy buenos profesionales son una gran familia trabajadores de años con muy buena experiencia .lo recomiendo porque son un gran equipo. Y realizan muy buen trabajo.