ASTM A 554 – 94: Welded Stainless Steel Mechanical Tubing

ASTM A 554 – 94

Welded Stainless Steel Mechanical Tubing

This specification covers round, square, rectangular and special shaped welded stainless steel tubing for use in mechanical applications where appearance, mechanical properties or corrosion resistance is needed. As-welded and cold reduced tubing is covered.

Dimensions and Tolerances

  • Dimensions. Round tubes normally furnished to this specification are in sizes <16 in (406.4 mm) OD and >0.020 in (0.51 mm) wall thickness. Square and rectangular tubing is normally furnished in sizes up to 51/2 in across flats.

  • Tolerances. Refer to page 3-41.

  • Cut Length Tolerances. See table below.

    Cut Length Tolerances (all tubing)

    Length

    Outside Diameter OD

    Variations in length

    Over

    Under

    ft

    m

    in

    mm

    in

    mm

    in or mm

    <4

    1.2

    <2

    <50.8

    1/16

    1.6

    0

    <4

    1.2

    >2 to 4

    >50.8 to 101.6

    3/32

    2.4

    0

    <4

    1.2

    >4

    >101.6

    1/8

    3.2

    0

    >4 to 10

    >1.2 to 3.0

    <2

    <50.8

    3/32

    2.4

    0

    >4 to 10

    >1.2 to 3.0

    >2

    >50.8

    1/8

    3.2

    0

    >10 to 24

    >3.0 to 7.3

    All

    All

    3/16

    4.8

    0

    Manufacture

  • Material. Refer to chemical composition table.

  • Manufacturing Process. Tubes are made from flat-rolled stainless steel by automatic welding process without the addition of filler metal.

  • Heat Treatment. As required to meet specification.

  • Marking. Each box, bundle or lift (or piece if individually shipped) to be identified with tag or stencil. Manufacturers name or brand, size, purchase order number, specification number and grade to be included. Bar code may be used for supplementary marking.

    Finish and Repair

  • Finish. Workmanlike finish free of injurous defects and with smooth ends free of burrs. Surface imperfections <10% of nominal wall or <0.002 in (0.05 mm) are acceptable.

  • Repair. Surface imperfections are only removed if special finish is specified.

  • Surface Finish. Free of scale. Special finishes may be specified.

  • Coating. Specified protection coating may be requested.

    Mandatory Testing

  • Heat Analysis. Each heat of steel or secondary melt to be analysed.

  • Product Analysis. Alternative to heat analysis. A report may be requested by purchaser.

    Ordering Information

    Item

    Notes

    Specification number

    ASTM A 554-94

    Size

    Round – Outside diameter and wall thickness. Alternatively for cold reduced tube: outside diameter and inside diameter, or inside diameter and wall thickness. Square and Rectangular– Outside diameter and wall thickness.

    Quantity

    Random or specified lengths. Total length or number of lengths

    Length

    Mill lengths, cut lengths or multiple lengths. Cutting allowance should be specified for multiple lengths.

    Name of material

    Welded stainless steel mechanical tubing

    Form

    Round, square, rectangular or special

    Grade

    Selected from chemical composition table

    Manufacture

    Automatic welding without filler metal

    Condition

    The following options are available: As welded. Welded and annealed. Cold reduced. Cold reduced and annealed. Inside bead not removed. Inside bead controlled to 0.005 in (0.13 mm) or 15% of the wall thickness whichever is greater. Inside bead removed.

    Test report

    DIN 50049.3.1.B standard, or DIN 50049.3.1.C optional (3rd party witness test) at extra cost

    Options and supplementary requirements

    Refer to optional and supplementary requirements S1 to S6

    Note

    – The above table is based on ASTM requirements except with regard to test reports, where standard practice options are added. See also page 10-2 for ISO based ordering and general delivery information.

    Optional and Supplementary Requirements

  • Protective Coating to be specified as required.

  • Special Surface Finishes may be specified.

  • Special Packing Requirements may be specified.

  • Condition. Options as listed in ordering information.

  • Report of heat or product analysis may be requested.

  • S1 Hardness Test. Test performed on a specimen from one tube from each 2500 ft (760 m).

  • S1 Tension Test. One test shall be performed on a specimen from one tube of each lot of 2500 ft (760 m) or fraction thereof from each heat of steel, prior to cutting to length.

  • S1 Nondestructive Test. When required, the test to be used and the inspection limits shall be specified in the order.

  • S1 Test Reports. Mill test reports furnished when specified in the order.

  • S1 Certification for Government Orders. Not applicable

  • S1 Rejection Provisions for Government Orders. Not applicable.

Tensile and Hardness Requirements

Grade

Tensile Strength min

Yield Strength min

Elongation in 2 in (50 mm), min

Brinell Hardness HB

Rockwell Hardness HRB

ksi

MPa

ksi

MPa

%

max

scale/max

All

75

517

30

207

35

192

B90

MT304L

70

483

25

172

35

192

B90

MT316L

70

483

25

172

35

192

B90

MT4291

60

414

35

241

20

190

B90

MT4301

60

414

35

241

20

190

B90

MT430Ti1

60

414

30

207

20

190

B90

Notes

– All = All austenitic grades except MT304L and MT316L. 1 Ferritic grade

Heat Treatment

Heat treatments to meet the specification are not defined in this standard.

Chemical Composition

Grade

Composition Percentage, max or range

&DUERn

C

0DQJDQHVe

Mn

3KRVSKRUXs

P

6XOSKXr

S

6LOLFRn

Si

1LFNHl Ni

&KURPLXm Cr

0RO\EGHQXm

Mo

Note

Austenitic Stainless Steels:

MT301

0.15

2.00

0.040

0.030

1.00

6.0-8.0

16.0-18.0

MT302

0.15

2.00

0.040

0.030

1.00

8.0-10.0

17.0-19.0

MT304

0.08

2.00

0.040

0.030

1.00

8.0-11.0

18.0-20.0

MT304L

0.035

2.00

0.040

0.030

1.00

8.0-13.0

18.0-20.0

4

MT305

0.12

2.00

0.040

0.030

1.00

10.0-13.0

17.0-19.0

MT309S

0.08

2.00

0.040

0.030

1.00

12.0-15.0

22.0-24.0

MT309SCb

0.08

2.00

0.040

0.030

1.00

12.0-15.0

22.0-24.0

1

MT310S

0.08

2.00

0.040

0.030

1.00

19.0-22.0

24.0-26.0

MT316

0.08

2.00

0.040

0.030

1.00

10.0-14.0

16.0-18.0

2.0-3.0

MT316L

0.035

2.00

0.040

0.030

1.00

10.0-15.0

16.0-18.0

2.0-3.0

4

MT317

0.08

2.00

0.040

0.030

1.00

11.0-14.0

18.0-20.0

3.0-4.0

MT321

0.08

2.00

0.040

0.030

1.00

9.0-13.0

17.0-20.0

2

MT330

0.15

2.00

0.040

0.030

1.00

33.0-36.0

14.0-16.0

MT347

0.08

2.00

0.040

0.030

1.00

9.0-13.0

17.0-20.0

1

Ferritic Stainless Steels:

MT429

0.12

1.00

0.040

0.030

1.00

0.50

max

14.0-

16.0

MT430

0.12

1.00

0.040

0.030

1.00

0.50

max

16.0-

18.0

MT430Ti

0.10

1.00

0.040

0.030

1.00

0.075

16.0-

19.5

3

Composition Notes

1 Niobium + Tantalum >10 x Carbon and 1.00% max 2 Titanium >5 x Carbon and 0.60% max

  1. Titanium >5 x Carbon and 0.75% max

  2. Carbon 0.040% max is necessary for tubes where many drawing passes are required, as with outside diameter <0.5 in (12.7 mm) or nominal wall thickness <0.049 in (1.2 mm) (minimum wall thickness <0.044 in (1.12 mm))

Note

– Niobium is sometimes referred to as Columbium.

Round Tube Tolerances

Round tube cross sectional tolerances (all conditions except tubing with bead removed)

Outside Diameter (OD)

Wall Thickness (t)

Variations in OD1

Variation in t

Ovality (Thin walled tube)1,3

±

±

in

mm

in

mm

in

mm

%

in

mm

<1/2

<12.7

0.020 to 0.049

0.51 to 1.24

0.004

0.10

10

0.004

0.10

1/to 1

12.7 to 25.4

0.020 to 0.065

0.51 to 1.65

0.005

0.13

10

0.005

0.13

1/to 1

12.7 to 25.4

>0.065 to

0.134

>1.65 to 3.40

0.010

0.25

10

0.010

0.25

>1 to 11/2

>25.4 to 38.1

0.025 to 0.065

0.64 to 1.65

0.008

0.20

10

0.008

0.20

>1 to 11/2

>25.4 to 38.1

>0.065 to

0.134

>1.65 to 3.40

0.010

0.25

10

0.010

0.25

>11/2to 2

>38.1 to 50.8

0.025 to 0.049

0.64 to 1.24

0.010

0.25

10

0.010

0.25

>11/2to 2

>38.1 to 50.8

>0.049 to

0.083

>1.24 to 2.11

0.011

0.28

10

0.011

0.28

>11/2to 2

>38.1 to 50.8

>0.083 to

0.149

>2.11 to 3.78

0.012

0.30

10

0.012

0.30

>2 to 21/2

>50.8 to 63.5

0.032 to 0.065

0.81 to 1.65

0.012

0.30

10

0.012

0.30

>2 to 21/2

>50.8 to 63.5

>0.065 to

0.109

>1.65 to 2.77

0.013

0.33

10

0.013

0.33

>2 to 21/2

>50.8 to 63.5

>0.109 to

0.165

>2.77 to 4.19

0.014

0.36

10

0.014

0.36

>21/2to 31/2

>63.5 to 88.9

0.032 to 0.165

0.81 to 4.19

0.014

0.36

10

0.014

0.36

>21/2to 31/2

>63.5 to 88.9

>0.165

>4.19

0.020

0.51

10

0.020

0.51

>31/2to 5

>88.9 to

127.0

0.035 to 0.165

0.89 to 4.19

0.020

0.51

10

0.020

0.51

>31/2to 5

>88.9 to

127.0

>0.165

>4.19

0.025

0.64

10

0.025

0.64

>5 to 16

>127.0 to

406.4

All

All

0.001252

10

1.5% OD

Notes

1 OD tolerance includes ovality tolerance except for thin wall tube 2 in/in or mm/mm of circumference

3 Ovality = Difference between maximum and minimum OD

Thin wall tube is defined as that with a wall thickness t <3% of OD

Round tube cross-sectional tolerances (for tubing with bead removed)

Outside Diameter OD

Wall Thickness (t)

Variations in OD1

Variation in ID

Variation in t

Ovality (Thin walled tube)1,3

±

±

±

in

mm

in

mm

in

mm

in

mm

%

in

mm

<3/32

<2.4

All

All

0.001

0.03

0.001

0.03

10

0.002

0.06

3/32 to

<3/16

2.4 to <4.8

All

All

0.0015

0.038

0.0015

0.038

10

0.003

0.076

3/16 to

<1/2

4.8 to

<12.7

All

All

0.003

0.08

0.005

0.13

10

0.006

0.16

1/2to <1

12.7 to

<25.4

All

All

0.004

0.10

0.006

0.15

10

0.008

0.20

1 to

<11/2

25.4 to

<38.1

All

All

0.005

0.13

0.007

0.18

10

0.010

0.26

11/2to

<2

38.1 to

<50.8

All

All

0.006

0.15

0.008

0.20

10

0.012

0.30

2 to

<21/2

50.8 to

<63.5

All

All

0.007

0.18

0.010

0.25

10

0.014

0.36

21/to

<31/2

63.5 to

<88.9

All

All

0.010

0.25

0.014

0.36

10

0.020

0.050

31/2to 5

88.9 to

All

All

0.015

0.38

0.020

0.51

10

0.030

0.76

127.0

>5 to 16

>127.0 to

406.4

All

All

0.001252

0.00132

10

0.00252

Notes

1 OD tolerance includes ovality tolerance except for thin wall tube 2 in/in or mm/mm of circumference

3 Ovality = Difference between maximum and minimum OD

Thin wall tube is defined as that with a wall thickness t <3% of OD

Square and Rectangular Tube Tolerances Outside dimension tolerances

Largest Nominal Outside Dimension Across Flats

Wall Thickness, t

Variation across Flats, Convexity or Concavity, ±

Variation in t, ±

in

mm

in/mm

in

mm

%

<11/4

<31.8

All

0.015

0.38

10

>11/to 21/2

31.8 to 63.5

All

0.020

0.51

10

>21/to 51/2

63.5 to 139.7

All

0.030

0.76

10

Maximum radii of corners

Wall Thickness

Radii of Corners, max

in

mm

in

mm

>0.020 to 0.049

0.51 to 1.24

3/32

2.4

>0.049 to 0.065

1.24 to 1.65

1/8

3.2

>0.065 to 0.083

1.65 to 2.11

9/64

3.6

>0.083 to 0.095

2.11 to 2.42

3/16

4.8

>0.095 to 0.109

2.42 to 2.77

13/64

5.2

>0.109 to 0.134

2.77 to 3.40

7/32

5.6

>0.134 to 0.156

3.40 to 3.96

1/4

6.4

Twist tolerances

Size

Twist

in

mm

in/3ft

mm/m

<1/2

12.7

0.050

1.4

>1/to 11/2

>12.7 to 38.1

0.075

2.1

>11/to 21/2

>38.1 to 63.5

0.095

2.6

>21/2

>63.5

0.125

3.5

Squareness of sides

Sizes and types

Out of Square Tolerances

All

0.006 x length of longest side

Straightness tolerances

Size

Twist

in/3ft

mm/m

All

0.075

2.1

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