ASTM A789 / A789M – 17: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

ASTM A789 / A789M – 17

Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

1. Scope 
1.1 This specification2 covers grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. 
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the designation of this specification is specified in the order. 

2. Ordering Information 

2.1 Orders for product under this specification should include the following, as required, to describe the desired material adequately: 
2.1.1 Quantity (feet, metres, or number of lengths), 
2.1.2 Name of product (seamless or welded tubes), 
2.1.3 Grade (see Table 1), 
2.1.4 Size (outside diameter and nominal wall thickness), 
2.1.5 Length (specific or random), 
2.1.6 Optional requirements (for product analysis, see Section 
8; for hydrostatic or nondestructive electric test, see Section 10), 
2.1.7 Test report required (see the Inspection section of 
Specification A 1016/A 1016M), 
2.1.8 Specification designation, and 
2.1.9 Special requirements. 
 

3. General Requirements 
3.1 Product furnished under this specification shall conform to the applicable requirements of Specification A 1016/A 1016M, unless otherwise provided herein.


Tensile and Hardness Requirements A

UNS Designation

Tensile Strength,
min, ksi[MPa]

Yield Strength,
min, ksi [MPa]

Elongation in 2 in. or 50 mm,min, %

Hardness, max

Brinell

 HRC

S31803

 90 [620]

65 [450]

25

290

30

S32205

 95 [655]

70 [485]

25

290

30

S31500

 92 [630]

64 [440]

30

290

30

S32550

 110 [760]

 80 [550]

15

297

31

S31200

100 [690]

 65 [450]

25

280

 . . .

S31260B

 100 [690]

65 [450]

25

290

30

S32001

 90 [620]

65 [450]

25

290

30

       S32304

OD 1 in. [25 mm] and Under

100 [690]

65 [450]

25

 . . .

. . .

OD over 1 in. [25 mm]

87 [600]

58 [400]

25

290

30

S39274

116 [800]

 80 [550]

15

310

 . . .

S32750

116 [800]

 80 [550]

15

300

32

S32760

109 [750]

 80 [550]

25

300

S32900

90 [620]

70 [485]

20

271

28

S32950C

100 [690]

 70 [480]

20

290

30

S39277

120 [825]

 90 [620]

25

290

30

S32520

112 [770]

80 [550]

25

310

       S32906

Wall below 0.40 in.(10 mm)

116 [800]

 94 [650]

25

300

32

Wall 0.40 in. (10 mm) and above

109 [750]

80 [550]

25

300

32

S32003

90 [620]

65 [450]

25

290

30

A For tubing smaller than 1⁄2 in. [12.7 mm] in outside diameter, the elongation values given for strip specimens in Table 4 shall apply. Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in outside diameter or with walls thinner than 0.015 in. [0.4 mm]. 
B Prior to A 789/A 789M–87, the values for S31260 were: 92 ksi tensile strength, 54 ksi yield strength, and 30 % elongation. 
C Prior to A 789/A 789M–89, the tensile strength value was 90 ksi for UNS S32950.


Chemical Requirements:

UNS
Designation A 

C

 Mn

 P

S

Si

 Ni

Cr

Mo

 N

 Cu

 Others

S31803

0.030 max

2.00 max

0.030 max

0.020 max

1.00 max

4.5–6.5

21.0–23.0

 2.5–3.5

0.08–0.20

. . .

. . .

S32205

0.030 max

2.00 max

0.030 max

0.020 max

1.00 max

4.5–6.5

22.0–23.0

3.0–3.5

0.14–0.20

. . .

 . . .

S31500

0.030 max

1.20–2.00

0.030 max

0.030 max

1.40–2.00

4.3–5.2

18.0–19.0

2.50–3.00

0.05–0.1

S32550

0.04 max

1.50 max

0.040 max

0.030 max

1.00 max

4.5–6.5

24.0–27.0

2.9–3.9

0.10–0.25

1.50–2.50

 . . .

S31200

0.030 max

2.00 max

 0.045 max

0.030 max

1.00 max

5.5–6.5

24.0–26.0

1.20–2.00

0.14–0.20

 . . . .

 . . . .

S31260

0.030 max

1.00 max

0.030 max

0.030 max

0.75 max

5.5–7.5

24.0–26.0

2.5–3.5

0.10–0.30

0.20–0.80

W 0.10–0.50

S32001

0.030 max

4.00–6.00

0.040 max

0.030 max

 1.00 max

1.0–3.0

19.5–21.5

0.60 max

0.05–0.17

1.00 max

 . . .

S32304

0.030 max

2.50 max

0.040 max

0.040 max

1.00 max

3.0–5.5

21.5–24.5

 0.05–0.60

0.05–0.20

0.05–0.60

 . . .

S39274

0.030 max

 1.00 max

0.030 max

0.020 max

0.80 max

6.0–8.0

24.0–26.0

2.5–3.5

0.24–0.32

0.20–0.80

W 1.50–2.50

S32750

0.030 max

1.20 max

0.035 max

0.020 max

0.80 max

6.0–8.0

24.0–26.0

3.0–5.0

 0.24–0.32

0.50 max

 . . .

S32760

0.05 max

1.00 max

0.030 max

0.010 max

1.00 max

6.0–8.0

24.0–26.0

3.0–4.0

0.20–0.30

 0.50–1.00

W 0.50–1.00
     40 minB

S32900

0.08 max

1.00 max

0.040 max

0.030 max

0.75 max

2.5–5.0

23.0–28.0

1.00–2.00

. . .

 . . .

 . . .

S32950

0.030 max

2.00 max

0.035 max

0.010 max

0.60 max

3.5–5.2

26.0–29.0

1.00–2.50

 0.15–0.35

 . . .

. . .

S39277

0.025 max

0.80 max

0.025 max

0.002 max

0.80 max

6.5–8.0

24.0–26.0

3.00–4.00

0.23–0.33

1.20–2.00

W 0.80–1.21

S32520

0.030 max

1.50 max

0.035 max

0.020 max

0.80 max

5.5–8.0

23.0–25.0

 3.–5.

0.20–0.35

0.50–3.00

 . . .

S32906

0.030 max

1.50 max
     0.80 min

0.030 max

0.030 max

0.50 max

7.5 max
     5.8 min

30.0 max
     28.0 min

2.60 max
     1.50 min

0.40
     .30

0.80
     . . .

. . .
     . . .

S32003

0.030 max

2.00 max

0.030 max

 0.020 max

1.00 max

3.0-4.0

19.5-22.5

1.50-2.00

0.14-0.20

 . . .

 . . .


Permissible Variations in Dimensions:


     Group

Size, Outside
   Diameter, in.
     [mm]

Permissible Variations inOutside Diameter, in.[mm]

Permissible
Variations in Wall
Thickness,A %

Permissible Variations in Cut
Length, in.B [mm]

Thin Walled TubesC

Over

Under

1

Up to 1⁄2 [12.7], excl

±0.005 [0.13]

±15

1⁄8 [3]

0

2

1⁄2 to 11⁄2 [12.7 to 38.1], excl

 ±0.005 [0.13]

±10

1⁄8 [3]

0

less than 0.065 in. [1.6 mm] nominal

3

11⁄2 to 31⁄2 [38.1 to 88.9], excl

±0.010 [0.25]

±10

3⁄16 [5]

0

less than 0.095 in. [2.4 mm] nominal

4

31⁄2 to 51⁄2 [88.9 to 139.7], excl

±0.015 [0.38]

±10

3⁄16 [5]

0

less than 0.150 in. [3.8 mm] nominal

5

51⁄2 to 8 [139.7 to 203.2], incl

±0.030 [0.76]

±10

3⁄16 [5]

0

less than 0.150 in. [3.8 mm] nominal

A When tubes as ordered require wall thicknesses 3⁄4 in. [19 mm] or over, or an inside diameter 60 % or less of the outside diameter, a wider variation in wall thickness is required. On such sizes a variation in wall thickness of 12.5 % over or under will be permitted. 
For tubes less than 1⁄2 in. [12.7 mm] in inside diameter that cannot be successfully drawn over a mandrel, the wall thickness may vary 615 % from that specified.
B These tolerances apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3 m], the above over-tolerances shall be increased by 1⁄8 in.
[3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1⁄2 in. [13 mm], whichever is the lesser. 
C Ovality provisions of 12.2 apply.

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