ASTM A 312/A 312M – 95a: Seamless and Welded Austenitic Stainless Steel Pipes

ASTM A 312/A 312M – 95a

Seamless and Welded Austenitic Stainless Steel Pipes

This specification covers austenitic steel pipe intended for high temperature and general corrosive service. H grades in the chemical composition table are specifically for high temperature service

Dimensions and Tolerances

  • Dimensions. All standard pipe sizes and wall thicknesses may be specified, subject to manufacturing limitations. Minimum wall thickness pipe is also covered as a supplementary requirement.

  • Tolerances. ASTM pipe

    Manufacture

  • Materials. Refer to chemical composition table.

  • Manufacture. In order to comply with this specification the pipe must be manufactured by an automatic welding process using no filler metal, or it must be a seamless pipe. If a welded pipe has a nominal pipe size greater than 14 then it may be constructed from two longitudinal sections, and hence have two longitudinal welds. The pipe may be either hot finished or cold finished.

  • Heat treatment. Refer to heat treatment table and supplementary requirement S6.

  • Marking on each length of pipe: Manufacturer’s make or brand, specification number, ‘WR’ if weld repaired, ‘NPS’ and schedule, ‘NH’ if no hydrotesting performed, ‘ET’ if eddy-current tested, ‘UT’ if ultrasonic tested. (NPS = Nominal Pipe Size.)

    Finish and Repair

  • Finish. The surface of the pipe must be clean and free of scale and contaminating iron particles. It can be bright annealed but may be pickled, blasted or can be passivated.

  • Repair by welding. Permitted on <20% of the weld seam length of welded pipe if >NPS 6 and having a wall thickness >0.200 in (mm). Tungsten-arc welding process is used for repairs, with filler metal to a grade as specified in A 312 (not repeated here). Weld repairs must be identified on the pipe and in test certificate.

    Mandatory Testing

  • Transverse or Longitudinal Tension Test. One test made on a specimen for lots of less than 100 pipes. Two tests made for greater lots.

  • Flattening Test. 5% of pipe will be treated and at least 2 pipes from heat treated lot. For welded pipe, transverse guided face bend test may be conducted in place of flattening test.

  • Grain Size Examination. The following grades will be subjected to grain size determinations, with 5% of the pipe being examined: TP309H, TP309HCb, TP310H, TP310HCb – grain size No 6 or coarser, UNS S32615 – grain size No 3 or finer.

  • Hydrostatic Test. Each pipe will be tested unless the pipe exceeds NPS 10 and the purchaser has agreed, or has agreed to alternative Nondestructive testing.

  • Nondestructive Examination. All processing must be completed before testing. Either Ultrasonic (Practice E 213) or Eddy Current (Practice E 426) testing may be used, or both. The operator must be qualified. A reference standard must be employed to regularly calibrate the testing equipment. Guidance regarding the reference standards, detailed in A 312, is not included in this summary.

    Ordering Information

    Item

    Notes

    Specification number

    ASTM A 312/A 312M-95a

    Size

    Nominal pipe size or outside diameter. Schedule or average wall thickness.

    Quantity

    Random or specified lengths. Total length or number of lengths.

    Name of material

    Austenitic stainless steel pipe

    Process

    Seamless or welded

    Grade

    Selected from chemical composition table

    End finish

    Plain ends with all burrs removed is ASTM requirement. Bevelled, or other end finishes can be specified.

    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 S8

    Note -The above table is based on ASTM requirements except with regard to alternative end finishes and 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

  • Chemical analysis of one billet or one length of flat rolled stock from each heat may be performed if required by purchaser.

  • Hydrostatic, eddy-current or ultrasonic testing.

  • Discontinuities. The type, size, location, orientation, of discontinuities that are of interest during NDT may be specified.

  • Hot or cold finishing.

  • Passivating treatment may be requested.

  • Surface Finish. Bright annealed or other surface finish.

  • Pipe Marking. The weight may be requested for pipe >NPS4.

  • S1 Product Analysis. NPS 5 and larger one analysis for each ten lengths from each heat of

  • steel. NPS smaller than 5 then only 10% need be tested.

  • S1 Tranverse Tension Tests. NPS 8 and larger can have one transverse tension test on 10% of lengths per he at of steel.

  • S1 Flattening Test. A flattening test will be made on a specimen from one or both ends of each pipe. The number of tests per pipe needs to be specified.

  • S1 Etching Tests. Etching tests show the homogeneity of pipes and are made on a cross section from one or both ends of a pipe.

  • S1 Radiographic Examination. The entire length of weld will be examined for any double welded pipe. In addition the pipe will be marked RT and the test results included in the certification.

  • S1 Stabilising Heat Treatment. The solution annealed grades TP309HCb, TP310HCb, TP321, TP321H, TP347, TP347H, TP348 and TP348H will be given a stabilisation heat treatment. Temperature will be as agreed between purchaser and vendor.

  • S1 Intergranular Corrosion Test. This test in accordance with Practices A 262 Practice E.

  • S1 Minimum Wall Pipe. A minimum wall thickness may be specified, in which case the wall thickness may not be below the thickness

Tensile Requirements

Tensile Strength min

Yield Strength min

Elongation in 2 in (50 mm) or 4D min

Grade

UNS

ksi

MPa

ksi

MPa

Longit %

Trans %

All

All

75

515

30

205

35

25

TP304L

S30403

70

485

25

170

35

25

TP304N

S30451

80

550

35

240

35

25

S31272

65

450

29

200

35

25

TP316L

S31603

70

485

25

170

35

25

TP316N

S31651

80

550

35

240

35

25

TP321

S32100

75(701)

515(4851)

30(251)

205(1701)

35

25

TP321H

S32109

75(701)

515(4851)

30(251)

205(1701)

35

25

TPXM- 10

S21900

90

620

50

345

35

25

TPXM- 11

S21904

90

620

50

345

35

25

TPXM- 19

S20910

100

690

55

380

35

25

TPXM- 29

S24000

100

690

55

380

35

25

S31254

94

650

44

300

35

25

S30615

90

620

40

275

35

25

S30815

87

600

45

310

35

25

S31050

84(782)

580(5402)

39(372)

270(2552)

25

S30600

78

540

35

240

35

25

S31726

80

550

35

240

35

25

S32615

80

550

32

220

25

S33228

73

500

27

185

35

25

S24565

115

795

60

415

35

25

S30415

87

600

42

290

35

25

S32654

109

750

62

430

35

25

S35315

94

650

39

270

35

25

N08367

100(953)

690(6553)

45(453)

310(3103)

30

N08904

71

490

31

215

35

25

Notes

– All = All grades listed in the chemical composition table other than those itemised in this table. 1 Values for wall thickness >3/8 in (9.5 mm)

  1. Values for wall thickness >1/4 in (6.35 mm)

  2. Values for wall thickness >0.187 in (4.75 mm)

Heat Treatment

Grade

UNS

Temperature °F

Temperature °C

Treatment

All

All

1900

1040

Minimum solution temperature. Quench1

TP304H

S30409

1900(1900)

1040(1040)

Minimum solution temp for cold (hot) working. Quench1

TP316H

S31609

1900(1900)

1040(1040)

Minimum solution temp for cold (hot) working. Quench1

TP321H

S32109

2000(1925)

1090(1050)

Minimum solution temp for cold (hot) working. Quench1

TP347H

S34709

2000(1925)

1090(1050)

Minimum solution temp for cold (hot) working. Quench1

TP348H

S34809

2000(1925)

1090(1050)

Minimum solution temp for cold (hot) working. Quench1

S30815

1920

1050

Minimum solution temperature. Quench 1,2

S31272

1920

1050

Minimum solution temperature. Quench 1

S31254

2100

1150

Minimum solution temperature. Quench1

S24565

2050-2140

1121-1170

Solution temperature range. Quench1

S32654

2100

1150

Minimum solution temperature. Quench1

S35315

2010

1100

Minimum solution temperature. Quench1

N08367

2025

1100

Minimum solution temperature. Quench1

N08904

2000

1100

Minimum solution temperature. Quench1

Notes

  • All = All grades listed in the chemical composition table other than those itemised in this table. 1 Quench in water or rapid cool by other means

    2 Pipe marking to include heat number and heat-treatment lot number

    Chemical Composition

    Grade

    UNS

    Composition Percentage, max or range

    &DUERn

    C

    0DQJDQHVe

    Mn

    3KRVSKRUXs

    P

    6XOSKXr

    S

    6LOLFRn

    Si

    1LFNHl Ni

    &KURPLXmCr

    0RO\EGHQXm

    Mo

    Note

    TP304

    S30400

    0.08

    2.00

    0.040

    0.030

    0.75

    8.00-11.0

    18.0-20.0

    TP304H

    S30409

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    8.00-11.0

    18.0-20.0

    TP304L

    S30403

    0.035

    2.00

    0.040

    0.030

    0.75

    8.00-13.0

    18.0-20.0

    25

    TP304N

    S30451

    0.08

    2.00

    0.040

    0.030

    0.75

    8.00-11.0

    18.0-20.0

    1

    TP304LN

    S30453

    0.035

    2.00

    0.040

    0.030

    0.75

    8.00-11.0

    18.0-20.0

    1

    TP309Cb

    S30940

    0.08

    2.00

    0.045

    0.030

    0.75

    12.0-16.0

    22.0-24.0

    0.75

    2

    TP309H

    S30909

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    12.0-15.0

    22.0-24.0

    TP309HCb

    S30941

    0.04-

    0.10

    2.00

    0.045

    0.030

    0.75

    12.0-16.0

    22.0-24.0

    0.75

    2

    TP309S

    S30908

    0.08

    2.00

    0.045

    0.030

    0.75

    12.0-15.0

    22.0-24.0

    0.75

    TP310Cb

    S31040

    0.08

    2.00

    0.045

    0.030

    0.75

    19.0-22.0

    24.0-26.0

    0.75

    2

    TP310H

    S31009

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    19.0-22.0

    24.0-26.0

    TP310HCb

    S31041

    0.04-

    0.10

    2.00

    0.045

    0.030

    0.75

    19.0-22.0

    24.0-26.0

    0.75

    2

    TP310S

    S31008

    0.080

    2.00

    0.045

    0.030

    0.75

    19.0-22.0

    24.0-26.0

    0.75

    S31272

    0.08-

    0.12

    1.5-2.0

    0.030

    0.015

    0.3-0.7

    14.0-16.0

    14.0-16.0

    1.0-1.4

    3

    TP316

    S31600

    0.08

    2.00

    0.040

    0.030

    0.75

    11.0-14.0

    16.0-18.0

    2.00-3.00

    24

    TP316H

    S31609

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    11.0-14.0

    16.0-18.0

    2.00-3.00

    24

    TP316L

    S31603

    0.035

    2.00

    0.040

    0.030

    0.75

    10.0-15.0

    16.0-18.0

    2.00-3.00

    25

    TP316N

    S31651

    0.08

    2.00

    0.040

    0.030

    0.75

    11.0-14.0

    16.0-18.0

    2.00-3.00

    1,24

    TP316LN

    S31653

    0.035

    2.00

    0.040

    0.030

    0.75

    11.0-14.0

    16.0-18.0

    2.00-3.00

    1,24

    TP317

    S31700

    0.08

    2.00

    0.040

    0.030

    0.75

    11.0-14.0

    18.0-20.0

    3.00-4.00

    TP317L

    S31703

    0.035

    2.00

    0.040

    0.030

    0.75

    11.0-15.0

    18.0-20.0

    3.00-4.00

    TP321

    S32100

    0.08

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    20

    TP321H

    S32109

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    21

    TP347

    S34700

    0.08

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    22

    TP347H

    S34709

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    23

    TP348

    S34800

    0.08

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    4, 22

    TP348H

    S34809

    0.04-

    0.10

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    4, 23

    TPXM-10

    S21900

    0.08

    8.0-10.0

    0.040

    0.030

    1.00

    5.50-7.50

    19.0-21.5

    5

    TPXM-11

    S21904

    0.04

    8.0-10.0

    0.040

    0.030

    1.00

    5.50-7.50

    19.0-21.5

    5

    TPXM-15

    S38100

    0.08

    2.00

    0.030

    0.030

    1.50-

    2.50

    17.5-18.5

    17.0-19.0

    TPXM-19

    S20910

    0.060

    4.0-6.0

    0.040

    0.030

    1.00

    11.5-13.5

    20.5-23.5

    1.50-3.00

    6

    TPXM-29

    S24000

    0.080

    11.5-14.5

    0.060

    0.030

    1.00

    2.25-3.75

    17.0-19.0

    7

    S31254

    0.020

    1.00

    0.030

    0.010

    0.80

    17.5-18.5

    19.5-20.5

    6.00-6.50

    8

    S30615

    0.16-

    0.24

    2.00

    0.030

    0.030

    3.2-4.0

    13.5-16.0

    17.0-19.5

    9

    S30815

    0.05-

    0.10

    0.80

    0.040

    0.030

    1.40-

    2.00

    10.0-12.0

    20.0-22.0

    10

    S31050

    0.025

    2.00

    0.020

    0.015

    0.4

    20.5-23.5

    24.0-26.0

    1.6-2.6

    11

    S30600

    0.018

    2.00

    0.020

    0.020

    3.7-4.3

    14.0-15.5

    17.0-18.5

    0.20

    12

    S31725

    0.03

    2.00

    0.040

    0.030

    0.75

    13.5-17.5

    18.0-20.0

    4.0-5.0

    13,26

    S31726

    0.03

    2.00

    0.040

    0.030

    0.75

    13.5-17.5

    17.0-20.0

    4.0-5.0

    14,26

    S32615

    0.07

    2.00

    0.045

    0.030

    4.8-6.0

    19.0-22.0

    16.5-19.5

    0.3-1.5

    15

    S33228

    0.04-

    0.08

    1.00

    0.020

    0.015

    0.30

    31.0-33.0

    26.0-28.0

    16

    S24565

    0.03

    5.0-7.0

    0.030

    0.010

    1.00

    16.0-18.0

    23.0-25.0

    4.0-5.0

    17

    S30415

    0.04-

    0.06

    0.80

    0.045

    0.030

    1.00-

    2.00

    9.0-10.0

    18.0-19.0

    18

    S32654

    0.020

    2.00-4.00

    0.030

    0.005

    0.50

    21.0-23.0

    24.0-25.0

    7.0-8.0

    19

    TP347LN

    S34751

    0.005-

    0.020

    2.00

    0.040

    0.030

    0.75

    9.00-13.0

    17.0-20.0

    27

    S35315

    0.04-

    0.08

    2.00

    0045

    0.030

    0.75

    34.0-36.0

    24.0-26.0

    18

    N08367

    0.030

    2.00

    0.040

    0.030

    1.00

    23.50-

    25.50

    20.0-22.0

    6.00-7.00

    28

    N08904

    0.020

    2.00

    0.045

    0.035

    1.00

    23.0-28.0

    19.0-23.0

    4.0-5.0

    29

    Composition Notes

    1 Nitrogen 0.10-0.16%

    2 Niobium + Tantalum: 10 x Carbon min, 1.10% max 3 Titanium 0.3-0.6%, Boron 0.004-0.008%

    4 Tantalum 0.10% max

    5 Nitrogen 0.15-0.40%

    6 Niobium + Tantalum: 0.10-0.30%, Nitrogen 0.20-0.40%, Vanadium 0.10-0.30%

    7 Nitrogen 0.20-0.40%

    8 Nitrogen 0.18-0.22%, Copper 0.50-1.00%

    9 Aluminium 0.8-1.5%

    10 Nitrogen 0.14-0.20%, Cerium 0.03-0.08%

    11 Nitrogen 0.09-0.15%

    1. Copper 0.50% max

    2. Nitrogen 0.10% max, Copper 0.75% max

    3. Nitrogen 0.10-0.20%, Copper 0.75% max

    15 Copper 1.5-2.5%

    1. Niobium + Tantalum: 0.6-1.0%, Cerium 0.05-0.10%, Aluminium 0.025% max

    2. Niobium + Tantalum: 0.1% max, Nitrogen 0.4-0.6%

    18 Nitrogen 0.12-0.18%, Cerium 0.03-0.08%

    19 Nitrogen 0.45-0.55%, Copper 0.30-0.60%

    1. Titanium >5 x Carbon and 0.70% max

    2. Titanium >4 x Carbon and 0.6% max

    3. Niobium + Tantalum >10 x Carbon and 1.00% max 23 Niobium + Tantalum >8 x Carbon and 1.0% max

    1. For welded pipe the nickel range is 10.0-14.0% max

    2. Carbon 0.040% max is necessary for pipes 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))

    3. For welded pipe, Phosphorus 0.045% max

    4. Niobium + Tantalum: 0.2-0.5%, >15 x Carbon, Nitrogen 0.06-0.10%

    5. Nitrogen 0.18-0.25%, Copper 0.75% max

    6. Nitrogen 0.10% max, Copper 1.0-2.0% Note

  • Niobium is sometimes referred to as Columbium

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