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ASTM A554 / ASME SA554 / Welded Stainless Steel Mechanical Tubing supplier & distributor in India

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ASTM A 554-88a / ASME SA 554 

WELDED STAINLESS STEEL MECHANICAL TUBING

1. Scope 

1.1 This specification covers welded stainless steel tubing for mechanical applications where appearance, mechanical properties, or corrosion resistance is needed. The grades covered are listed in table.

1.2 This specification covers as-welded or cold-reduced mechanical tubing in sizes to 16 in. (406.4mm) outside diameter, inclusive(for round tubing)and in wall thicknesses 0.020in.(0.51mm)and over. 

1.3 Tubes shall be furnished in one of the following shapes as specified by the purchaser: round, square, rectangular, or special. 

1.4 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.

1.5 The values stated in inch-pound units are to be regarded as the standard. 




Table 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





  Table 2 Diameter, Wall,A and Ovality Toerances


(All Conditions Except Tubing with Bead Removed) 

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




AWall tolerance ±10% of nominal wall thickness. 


TABLE 3 Diameter, Wall,A and Ovality Tolerances for Tubing with Bead Removed 

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




AWall tolerance is ±10% ofnominal wall thickness. 


TABLE 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




AFor all diameters in lengths over 24 ft (7.3m), an additional over tolerance of 1.8 in. (3.2 mm) for each 10 ft (3.0m) 
or fraction thereof shall be permissible, up to a toleranceof 1/2 in. (12.7mm), max. determined from a product 
analysis made by the tubular product manufacturer, shall conform to requirements specified. 
When requested in the order or contract, a report of this analysis shall be furnished to the purchaser.   


TABLE 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.



zAWall tolerance is ±10% of nominal wall thickness.  



TABLE 7 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




AFor longitudinal strip tests, the width of the gage section shall be 1 in. (25.4mm) and a deduction of 1.75 percentage 
points for austeniticc grades and 1.0 percentage points for MT 429 and MT 430 shall be permitted from the basic 
minimum elongation for each 1/32-in. (0.79-mm) decrease in wall thickness below 5/16 in. (7.94mm).

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