We produce stainless steel ornamental tubing as per ASTM A554 specification, stainless steel includes 304, 304L, 316, and 316L grade, used for ornamental, structural, exhaust, and other applications, and various finishes can be offered to meet specific purposes. ASTM A554 is a standard specification for welded stainless steel mechanical tubing, it specifies the detailed requirements for tubing manufacturers, such as dimension, grade, forms, condition, and tolerance.
Mechanical tubing is a type of tubing used for mechanical and structural applications, there are varieties of shapes and finishes to choose from, so mechanical tubing is widely used for wide applications. Our production facilities provide a full range of standard mechanical steel tubing sizes to meet customers’ needs, we offer various shapes of mechanical tube solutions for most applications, for example, building, construction, and architecture industries.
ASTM A554 Ornamental Tubing Specifications
| Standard | ASTM A554 |
|---|---|
| Type | Welded Tubes |
| Grades | MT304 / 304L, MT316 / MT316L, MT321, MT430, TMT310S |
| Finishes | Annealed, As Welded, Polishing |
| Outside Diameter | 12.7 – 406.4 Mm |
| Thickness | 0.5 – 6.35 Mm |
| Forms | Round Tubing, Square Tubing, Rectangular Tubing, Elliptical Tubing |
ASTM A554 Welded Tubing
We offer a wide range of sizes for ASTM A554 welded ornamental tubes, including round tube, square tube, rectangular tube and special form dimensions, TIG automatic welding process from stainless steel materials, welding control as standard, bead removed or not removed as requested.
- As welded
- Annealing and pickling
- Cold reduced
- Cold reduced and annealing
We also produce other forms of stainless steel tubing for decorative purposes, like bending tubing, and elliptic tubing, besides polishing surface performance, brushed finishing, satin finishing and hairline can be performed upon request.
Stainless Steel Material
Stainless steel grades 304/304L, and 316L are custom materials for ornamental tubing, 201 grade is also used for decorative tubing, and Ferritic and Martensitic Stainless Steels are available in bright polishing stainless steel tubing.
| UNS No | AISI No / Common Name |
|---|---|
| S30400 | 304 |
| S30400 | 304 |
| S30403 | 304L |
| S31600 | 316 |
| S31603 | 316L |
| S31635 | 316Ti |
| S31700 | 317 |
| S31703 | 317L |
| S32100 | 321 |
| S34700 | 347 |
Polishing Finish
Stainless steel ornamental tubing is often performed in polishing finishing to make bright surface
- 180 grit
- 240 grit
- 320 grit
- 400 grit
- 600 grit – mirror finishing
Quality
Ornamental tubing tolerance is controlled conforming to ASTM A554 mechanical tubing specification, round tubing, square tubing, and rectangular tubing can be produced with a wide range of dimensions and low roughness value should be inspected outside and inside surface.
Outside Dimension Tolerances Of Round Tubing
| OD Size, in.(mm) | Wall Thickness | OD,± | ||
|---|---|---|---|---|
| in. | mm | in. | mm | |
| Under ½ (12.7) | 0.020 ‐ 0.049 | 0.51 ‐ 1.24 | 0.004 | 0.10 |
| ½ ‐ 1 (12.7‐25.4) | 0.020 ‐ 0.065 | 0.51 ‐ 1.65 | 0.005 | 0.13 |
| ½ ‐ 1 (12.7‐25.4) | over 0.065 ‐ 0.134 | over 1.65 ‐ 3.40 | 0.010 | 0.25 |
| Over 1 ‐ 1 ½ (25.4‐38.1), incl | 0.025 ‐ 0.065 | 0.64 ‐ 1.65 | 0.008 | 0.20 |
| Over 1 ‐ 1 ½ (25.4‐38.1), incl | over 0.065 ‐ 0.134 | over 1.65 ‐ 3.40 | 0.010 | 0.25 |
| Over 1 ½ ‐ 2 (38.1‐50.8), incl | 0.025 ‐ 0.049 | 0.64 ‐ 1.24 | 0.010 | 0.25 |
| Over 1 ½ ‐ 2 (38.1‐50.8), incl | over 0.049 ‐ 0.083 | over 1.24 ‐ 2.11 | 0.011 | 0.28 |
| Over 1 ½ ‐ 2 (38.1‐50.8), incl | over 0.083 ‐ 0.149 | over 2.11 ‐ 3.78 | 0.012 | 0.30 |
| Over 2 ‐ 2 ½ (50.8‐63.5), incl | 0.032 ‐ 0.065 | 0.81 ‐ 1.65 | 0.012 | 0.30 |
| Over 2 ‐ 2 ½ (50.8‐63.5), incl | over 0.065 ‐ 0.109 | over 1.65 ‐2.77 | 0.013 | 0.33 |
| Over 2 ‐ 2 ½ (50.8‐63.5), incl | over 0.109 ‐ 0.165 | over 2.77 ‐ 4.19 | 0.014 | 0.36 |
| Over 2 ½ ‐ 3 ½ (63.5‐88.9), incl | 0.032 ‐ 0.165 | 0.81 ‐ 4.19 | 0.014 | 0.36 |
| Over 2 ½ ‐ 3 ½ (63.5‐88.9), incl | over 0.165 | over 4.19 | 0.020 | 0.51 |
| Over 3 ½ ‐ 5 (88.9‐127.0), incl | 0.035 ‐ 0.165 | 0.89 ‐ 4.19 | 0.020 | 0.51 |
| Over 3 ½ ‐ 5 (88.9‐127.0), incl | over 0.165 | over 4.19 | 0.025 | 0.64 |
| Over 5 ‐ 7 ½ (127.0‐190.5), incl | 0.049 ‐0.250 | 1.24 ‐ 6.35 | 0.025 | 0.64 |
| Over 5 ‐ 7 ½ (127.0‐190.5), incl | over 0.250 | over 6.35 | 0.030 | 0.76 |
| Over 7 ½ ‐ 16 (190.5‐406.4), incl | all | all | 0.00125 in./in. or mm/mm of cicumference | |
Outside Dimension Tolerances Of Square & Rectangular Tubing
| Largest Specified OD Across Flats, in.(mm) | Wall Thickness | across flats, Convexity or Concavity, ± | ||
|---|---|---|---|---|
| in. | mm | in. | mm | |
| To 1 ¼ (31.8), incl | all | 0.015 | 0.38 | |
| Over 1 ¼ to 2 ½ (31.8‐63.5), incl | all | 0.020 | 0.51 | |
| Over 2 ½ to 5 ½ (63.5‐139.7), incl | all | 0.030 | 0.76 | |
| Over 5 ½ to 8 (139.7‐203.2), incl | all | 0.060 | 1.52 | |
Wall Thickness Tolerances: ± 10% of specified wall thickness.
ASTM A554 Standard Specification
ASTM A554 covers standard specification for welded stainless steel tubing for mechanical applications where appearance, mechanical properties, or corrosion resistance are needed. The tubes shall be made from flat-rolled steel by an automatic welding process without the addition of filler metal. Tubes shall be furnished in one of the following shapes – round, square, rectangular, or special. Heat analysis shall be performed wherein several grades of steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, titanium, columbium, and tantalum.
ASTM A554 PDF
Stainless Steel Material
Stainless steel has high strength and perfect corrosion resistance, these properties make tubing durable, and not easy to damage, there are various finishes to be offered for different purposes, therefore, stainless steel is an ideal material for mechanical and structural applications.
304 stainless steel is a common grade, 304L, 316L and other grades are used depending on applications.
Sizes and Dimensions
We offer a wide variety of sizes for tubing used for mechanical purposes, outside diameter ranges from 6 mm to 406.4 mm, minimum wall thickness is 0.51, these are common sizes for round tubing, and special sizes of tubing can be offered upon request in large quantity, like particular heavy wall and thin wall tubing.
Forms and Shapes
Besides round tubes, we can also offer shaped tubes, such as square tubing, rectangular tubing, oval tubing, and bending tubing.
Conditions and finishes
As welded is the most common condition for mechanical tubing, tubing is welded without stress-relieving or annealing, generally, cold drawn and bead-removed processes are not required, these conditions are the main reasons why mechanical tubing is cost-effective.
There are various stainless steel tubing finishes to opt for, polishing finishing is usually required for ornamental and decorative purposes, common grits include #180, #320, #400, and mirror polishing.
