ASTM A554

ASTM A554 – Standard Specification for Welded Stainless Steel Mechanical Tubing, tubing is use in ornamental, structural, exhaust, and other applications.

ASTM A554 specification download free PDF.

Stainless Steel Types

Stainless steel possess good corrosion resistance and mechanical properties, ASTM A554 grades include Austenitic grades and Ferritic grades, Austenitic grades cover MT301, MT302, MT304, MT304L, MT305, MT309S, MT310S, MT310, MT316L, MT317, MT321, MT347, Ferritic steels cover 409, 434, 436, 439, 444, 410s.

Common stainless steel grades and chemical composition are listed below.

Grade C Si Mn Cr Ni Mo S P
MT304 0,08 1,0 2 18 – 20 8 – 11 0,03 0,045
MT304L 0,035 1,0 2 18 – 20 8 – 13 0,03 0,045
MT316 0,08 1,0 2 16 – 18 10 – 14 2 – 3 0,03 0,045
MT316L 0,035 1,0 2 16 – 18 10 – 15 2 – 3 0,03 0,045
MT321 0,08 1,0 2 17 – 19 9 – 12 0,03 0,045

ASTM A554 stainless steel grades mechanical properties.

Grade Tensile strength(Mpa), min Yield point(Mpa), min Elongation(%)
MT 429 and MT 430 414 241 20
MT 430Ti 414 207 20
MT 304L, MT 316L 483 172 35
All other Austenitic steels 517 207 35
MT409 379 207 20
All other Ferritic 414 241 20

ASTM A554 Tubing Shapes

Round tubing, square tubing, rectangular tubing.

Conditions

  • As welded
  • Welded and annealed
  • Cold reduced>
  • Cold reduced and annealed
  • bead not removed
  • bead removed

ASTM A554 Tubing Sizes

This specification covers as-welded or cold-reduced mechanical tubing in large range of sizes, maximum outside dimension up to 16 inch (406.4 mm), and minimum wall thicknesses 0.020 inch (0.51 mm).

Permissible Variations in Dimensions—Round Tubing

Outside Diameter Thickness Outside Diameter
Tolerance
Thickness
Tolerance
Length
Tolerance
≤12.7 0.51~1.24 ±0.10 ±10.00%T(±10% of nominal
wall thickness)
±4.80 -0
>12.7~25.4 0.51~1.65 ±0.13
>1.65~3.4 ±0.25
>25.4~38.1 0.64~1.65 ±0.20
>1.65~3.4 ±0.25
>38.1~50.8 0.64~1.24 ±0.25
>1.24~2.11 ±0.28
>50.8~63.5 >2.11~3.78 ±0.30
0.81~1.65 ±0.30
>1.65~2.77 ±0.33
>63.5~88.9 >2.77~4.19 ±0.36
0.81~4.19 ±0.36
>88.9~127 0.89~4.19 ±0.51
>4.19 ±0.64
>127~168 1.24~6.35 ±0.64
>6.35 ±0.76

Square & Rectangular Outside Dimension Tolerances

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.

Manufacture

The tubes shall be made from flat-rolled steel by an automatic welding process without the addition of filler metal

Testing and inspection

  • Hardness test (option)
  • Tension test (option)
  • Nondestructive test (option)

ASTM A554 Stainless Steel Tubing