ASTM A554 Stainless Steel Square Tubing

Stainless steel square tubing is widely used for architectural ornament, metalwork, machine building, furniture and sanity tools, stainless steel grades have 201, 304, 304L, 316L, 321 etc, these stainless steels are ideal material for various applications due to their strength, durability, and corrosion resistance.

Yaolong Tube offer welded square tubing with large range of sizes and dimensions in various lengths and custom specifications, it is measured by outside diameter and the wall thickness, ASTM A554 is a standard specification to specify stainless steel square tubing for mechanical purpose.

ASTM A554 Square Tubing

ASTM A554 specification is a common standard for welded stainless steel mechanical tubing, beside square shape tubing, and round tubing, rectangular tubing and special forms tubes. All tubes are produced strict as A554, no addition metal added.

Both as welded and annealed condition are available, square mechanical tubing should be cold worked.


We use automatic TIG welding method to produce square tubing, quality weld seam can be finished due to advantages of TIG welding, learn more about TIG welding tubing.

Quality Control For ASTM A554 Square Tubes

Our tube mill operators complete all required ASTM A554 and customer specifications testing, based on fabrication and surface finish requirements. Mechanical tests are performed at regular intervals, and all tubing is 100% inline eddy current tested. If the tubing is to be mandrel bent, ID tolerances are critical. Therefore, plug gauges are utilized to ensure adequate clearance and customer-required dimensions are met. Mechanical polishing compounds and equipment are continually monitored using polished tube samples

Square Tubing Specifiction

We offer stainless steel square tubing in various outside diameter, wall thickness and length, small diameter and large diameter sizes of square tubes are available

Dimensional Tolerances

Outside Diameter (In/Mm) OD Tolerance (In/Mm)
To 1 1⁄4 (31.8), Incl 0.015 (0.38)
Over 1 1⁄4 To 2 1⁄2 (31.8 To 63.5), Incl 0.020 (0.51)
Over 2 1⁄2 To 5 1⁄2 (63.5 To 139.7), Incl 0.030 (0.76)
Over 5 1⁄2 To 8 (139.7 To 203.2), Incl 0.060 (1.52)

Surface Finish

usually, stainless steel square tubing is polished in various grits to achieve bright surface, there are mill finishes and polished finishes for square tubing, polishing tubing finishes include 180 Grit (#4 polish), 240 Grit, 320 Grit and a #8 mirror finish.

・180 grit
・240 grit
・320 grit
・400 grit
・600 grit – mirror finishing

Material and Composition

There is a variety of stainless steel grades to select, different stainless steels exhibit unique mechanical properties and corrosion resistance to meet various requirements of application, and multiple finishes can be achieved for different purposes.

304 stainless steel grade is the most used material for square tubing, 304 offers good corrosion resistance and overall properties including good weldability, and formability to meet the most requirements, it is a economical selection.

ASTM A554 specified stainless steel grade with prefix MT, like MT201, MT304, MT316, MT316L.

Product Delivery and Packaging

・ Bundles, outside with plastic bag
・ Small bundles in plywood case
・ Steel frame case
・ Plywood case
・ Plastic bag for single large diameter pipes
・ U bending tubes package
・ Tube ends with caps, each tube with plastic bag

A554 Stainless Steel Square Tube Applications

Stainless steel square tubing is typically use for ornamental purpose in polished or non polished finish surface, straight and bending length are available, architectural and structural applications are often referred to square tubing.

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