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Standard ASTM A554

This guide covers standard specification for welded stainless steel tubing for mechanical applications where appearance, mechanical properties, or corrosion resistance is 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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Chemical Requirements

Grade Composition, %
Carbon,
max
Manganese,
max
Phos-
phorus,
max
Surfur,
max
Silicon,
max
Nickel Chromium Molybdenum Titanium Columbium
+Tantalum
Austenitic
MT-301 0.15 2.00 0.040 0.030 1.00 6.0-8.0 16.0-18.0
MT-302 0.15 2.00 0.040 0.030 1.00 8.0-10.0 17.0-19.0
MT-304 0.08 2.00 0.040 0.030 1.00 8.0-11.0 18.0-20.0
MT-304L 0.035A 2.00 0.040 0.030 1.00 8.0-13.0 18.0-20.0
MT-305 0.12 2.00 0.040 0.030 1.00 10.0-13.0 17.0-19.0
MT-309S 0.08 2.00 0.040 0.030 1.00 12.0-15.0 22.0-24.0
MT-309S-Cb 0.08 2.00 0.040 0.030 1.00 12.0-15.0 22.0-24.0 C
MT-310S 0.08 2.00 0.040 0.030 1.00 19.0-22.0 24.0-26.0
MT-316 0.08 2.00 0.040 0.030 1.00 10.0-14.0 16.0-18.0 2.0-3.0
MT-316L 0.035A 2.00 0.040 0.030 1.00 10.0-15.0 16.0-18.0 2.0-3.0
MT-317 0.08 2.00 0.040 0.030 1.00 11.0-14.0 18.0-20.0 3.0-4.0
MT-321 0.08 2.00 0.040 0.030 1.00 9.0-13.0 17.0-20.0 B
MT-330 0.15 2.00 0.040 0.030 1.00 33.0-36.0 14.0-16.0
MT-347 0.08 2.00 0.040 0.030 1.00 9.0-13.0 117.0-20.0 C
Ferritic
MT-429 0.12 1.00 0.040 0.030 1.00 0.50
max
14.0-16.0
MT-430 0.12 1.00 0.040 0.030 1.00 0.50
max
16.0-18.0
MT-430-Ti 0.10 1.00 0.040 0.030 1.00 0.075 max 16.0-19.5 5 x C min.
0.75 max

2. Diameter, Wall,A and Ovality Toerances

NOTE 1 – Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no additional tolerance for ovality on tubes having a nominal wall thickness of more than 3% of the outside diameter.
NOTE 2 – For sizes up to and including 5-in. (127.0-mm) outside diameter, an ovality tolerance of twice the tabular outside diameter tolerance spread shown is applied diamter readings should fall within the outside diameter tolerances as shown in this table.
NOTE 3 – For sizes over 5-in. (127.0mm) to and including 16-in. (406.4-mm) outside diameter, when the specified wall thickness is 3% or less of the outside diameter, the ovality shall not exceed 1.5% of the specified outside diameter.

OD Size, in.(mm) Wall Thickness OD, ±
in. mm in. mm
Under 1/2 (12.7) 0.020 to 0.049 0.51 to 1.24 0.004 0.10
1/2 to 1 (12.7 to 25.4) 0.020 to 0.065 0.51 to 1.65 0.005 0.13
1/2 to 1(12.7 to 25.4) over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
Over 1 to 1/2 (25.4 to 38.1), incl 0.025 to 0.065 0.64 to 1.65 0.008 0.20
Over 1 to 1/2 (25.4 to 38.1), incl over 0.065 to 0.134 over 1.65 to 3.40 0.010 0.25
Over 1 to 2 (25.4 to 38.1), incl 0.025 to 0.049 0.64 to 1.65 0.010 0.25
Over 1 to 2 (25.4 to 38.1), incl over 0.049 to 0.083 over 1.65 to 3.40 0.011 0.28
Over 1 to 2 (25.4 to 38.1), incl over 0.083 to 0.149 0.64 vo 1.24 0.012 0.30
Over 2 to 2 1/2 (25.4 to 38.1), incl 0.032 to 0.065 over 1.24 to 2.11 0.012 0.30
Over 2 to 2 1/2 (25.4 to 38.1), incl over 0.065 to 0.109 over 2.11 to 3.78 0.013 0.33
Over 2 to 2 1/2 (25.4 to 38.1), incl over 1.109 to 0.165 0.81 to 1.65 0.014 0.36
Over 2 to 3 1/2 (25.4 to 38.1), incl 0.032 to 0.165 over 1.65 to 2.77 0.014 0.36
Over 2 to 3 1/2 (25.4 to 38.1), incl over 0.165 over 2.77 to 4.19 0.020 0.51
Over 3 to 5 1/2 (25.4 to 38.1), incl 0.035 to 0.165 0.81 to 4.19 0.020 0.51
Over 3 to 5 1/2 (25.4 to 38.1), incl over 0.165 over 4.19 0.025 0.34
Over 5 to 16 1/2 (25.4 to 38.1), incl all all 0.00125 in./in. or mm/mm of circumference

3. Diameter, Wall.

NOTE 1 – Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no addifional tolerance for ovality on tubes having a nominal wall thickness of more than 3% of the outside diameter.
NOTE 2 – An ovality allowance of twice the outside diameter tolerance, shown in this table, is applied one half plus and one haif minus to the outside diameter, for tubes having a nominal wall thickness of 3% or less of the outside diameter. The average of the maximum and minimum outside diameter readings should fall within the outside diameter tolerances of this table.
NOTE 3 – Tubing may be specified to only two of the three following dimensions-outside diameter, inside diameter, or wall.

OD Size, in.(mm) OD, ± ID, ±
in. mm in. mm
Up to 3/32 (2.4), excl 0.001 0.03 0.001 0.03
3/32 to 3/16(2.4 to 4.8), excl 0.0015 0.038 0.0015 0.038
3/16 to 1/2 (4.8 to 12.7), excl 0.003 0.08 0.005 0.13
1/2 to 1 (12.7 to 25.4), excl 0.004 0.10 0.006 0.15
1 to 1 1/2 (25.4 to 38.1), excl 0.005 0.13 0.007 0.18
1
1/2 to 2 (38.1 to 50.8), excl
0.006 0.15 0.008 0.20
2 to 2 1/2 (50.8 to 63.5), excl 0.007 0.18 0.010 0.25
2 1/2 to 3 1/2 (63.5 to 88.9), excl 0.010 0.25 0.014 0.36
3 1/2 to 5 (88.9 to 127.0), incl 0.015 0.38 0.020 0.51
Over 5 to 6 (127.0 to 406.4), incl 0.00125 in./in. or
mm/mm of circumference
0.0013 in./in. or
mm/mm of circumference

4. Length Variations – Cut Length Tubes

Length, ft (m) Outside
Diameter,
in.(mm)
Permissible Variations
in Length, in.
OverA Under
in. mm
4 (1.2) and under up to 2(50.8), incl 1/16 1.6 0
over 2 to 4(50.8 to 101.6), incl 3/32 2.4 0
over 4(101.6) 1/8 3.2 0
Over4 to 10 (1.2 to 3.0), incl up to 2(50.8), incl 3/32 2.4 0
over 2(50.8) 1/8 3.2 0
Over 10 to 24 (3.0 to 7.3), incl all sizes 3/15 4.8 0

5. Square and Rectangular Tubing

Outside Dimension Tolerances
Largest Nominal Outside
Dimension Across Flats,
in.(mm)
Wall Thickness,A in.
(mm)
±,in.(mm), across Flats, Convexity
or Conscavity, incl
To 1 1/4(31.8), incl all 0.015(0.38)
Over 1 1/4 to 2 1/2 (31.8 to 63.8), incl all 0.020(0.51)
Over 2 1/2 to 5 1/2 (63.5 to 139.7), incl all 0.030(0.76)
Maximum Radii of Comers
Wall Thickness, in.(mm) Radii
of Comers, max, in.(mm)
Over 0.020 to 0.049 (0.51 to 1.24), incl 3/32
(2.4)
Over 0.020 to 0.049 (0.51 to 1.24), incl 1/8
(3.2)
Over 0.020 to 0.049 (0.51 to 1.24), incl 9/64 (3.6)
Over 0.020 to 0.049 (0.51 to 1.24), incl 3/16(4.8)
Over 0.020 to 0.049 (0.51 to 1.24), incl 13/34(5.2)
Over 0.020 to 0.049 (0.51 to 1.24), incl 7/32(5.6)
Over 0.020 to 0.049 (0.51 to 1.24), incl 1/4(6.4)
Twist Tolerances
Largest Size, in. (mm) Twist in 3 ft,
max, in.
(mm/m)
Under 1/2(12.7) 0.050(1.4)
1/2 to 1 1/2(12.7 to 38.1), incl 0.075(2.1)
Over 1 1/2 to 2 1/2(38.1 to 63.5), incl 0.095(2.6)
Over 2 1/2 (63.5) 0.125(3.5)
Squareness of Sides
±B = C x 0.006
where :
B = tolerance for out-of-square, and
C = length of longest side.
The straightness tolerance is 0.075 in. in 3 ft or 2.1 mm in 1 m using a 3-ft (1-m) straightedge and feeler gage.

6. Tensile Requirements (Round Annealed Condition)

Grade Tensile
Strength,
min
Yield
Strength,
min
Elongationa IN 2 IN. OR 50MM, MIN, %
ksi MPa ksi MPa
MT 429 and MT 430 60 414 35 241 20
MT-430-Ti 60 414 30 207 20
MT 304 L & 8 MT 316 L 70 483 25 172 35
All other austenitic steels 75 517 30 207 35