Automotive Tubing for Exhaust Systems

ISO9002:1994 / QS-9000:1998
QS Certified | #0009870

United Industries has over 80 years of experience producing both ferritic-grade and austeniticgrade stainless steel tubing for automotive industry applications. Production of a wide variety of laser welded, stainless alloys is available.

United Industries specializes in the high-quality tubing required for severe fabrication applications, including tubular manifolds, crossover and downpipes, spun catalytic converters, muffler/resonator components, and tailpipes.


All tubing is produced in a true inline/work cell environment that minimizes work-in-process problems common among most batch-type manufacturing. Raw materials are purchased in wide coils and slit to width. The tube production begins with roll forming, then laser welding, weld bead conditioning, inline induction or hydrogen bright annealing (when specified), final sizing OD stencil (if required), cut to length, deburring, polishing (when specified), and packaging for shipment.


Polished tubing has become increasingly popular for visible exhaust components. Inline polishing is available ranging from 180-grit satin type to a high-luster super buff finish. All tubing is paperprotected to ensure the ultimate surface condition during shipment and customer handling.


All United Industries’ tubing is tested to ASTM and customer fabrication requirements by the operator of each work cell. Tubing is 100% eddy current tested, and destructive tests are performed at regular intervals. Incoming raw material is inspected and must conform to our rigid standards set for all our suppliers. Final dock audits are made to ensure consistent quality.

Product Delivery

United Industries’ JIT manufacturing capabilities allow us to accommodate shipment or pickup on a daily, weekly, or other customer-specified timetable. This reduces customer inventory, increases inventory turns, and reduces costs. A wide variety of transportation options are available; contact

ISO/TS16949:2009 Registered Quality Management System



  • ASTM SA249 Boiler / Heat Exchanger
  • ASTM A268 Ferritic
  • ASTM A269 General Services
  • ASTM A270 Sanitary / Pharmaceutical
  • ASTM A554 Ornamental


  • 1" – 60'


  • Stainless 301 302, 304, 304L, 316, 316L, 309, 309S, 310, 321, 12SR/408CB, 18SR. 18CB/441, 29-4C, 317, 317L
  • Stainless 405, 409, 410, 430, 439
  • Super Alloys


  • 1/2" – 8"
  • .019" – .145" wall

Surface Finish

  • Mechanical Polish 20 Ra / 32 Ra
  • Electro Polish 15 Ra / 10 Ra
  • Hydrogen Bright Annealing (H-BA)

Plant Facilities

  • Over 130,000 Sq. Ft. (Selmer, TN)
  • 6 laser mills
  • Inline induction annealing and H-BA
  • Tube cutting facility


  • Square pack, scored cardboard, tri-wall box, paper/poly sleeve, interleave, interweave, cardboard tubes, hex pack, bulk skids, customer returnables
  • Export packaging available

Quality Assurance / Testing

  • Quality Management System
  • Inline Eddy Current
  • Expansion
  • Flatten
  • Tension
  • Rockwell
  • Metallurgical
  • Dimensional
  • Bend
  • Flare
  • Reverse Bend
  • Flange
  • Surface Roughness
  • Surface Passivity
  • Others Upon Request

Finished Inventory

  • Sanitary and H-BA 1"– 8", 304L and 316L