ASTM A 403/A 403M – 96: Wrought Austenitic Stainless Steel Pipe Fittings
ASTM A 403/A 403M – 96
Wrought Austenitic Stainless Steel Pipe Fittings
This specification covers two general classes, known as WP (Wrought Pipe) and CR (Corrosion Resistant) stainless steel fittings of both seamless and welded construction.
Dimensions and Tolerances
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Dimensions and Tolerances. ASME/ANSI B16.9, B16.11 and B16.28, and MSS SP-43, SP- 79 and SP-95 are referenced. Supplementary requirement S9 applies for non-standard fittings. – Buttweld Fittings Dimensions and Tolerances are covered in Section 6 (see page 6-1). – Socket Weld and Threaded Fittings Dimensions and Tolerances are covered in Section 7 (see page 7-1)
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Wall Thicknesses are as defined in appropriate pipe specifications (see Section 5). Minimum thickness must not be encroached.
Manufacture
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Materials. Refer to chemical composition table. Fittings may be made from forgings, bars, plates, or seamless or welded tubular products, provided the materials conform to the chemical composition table.
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The steel may be melted by electric-furnace, or vacuum-furnace, or by either of these followed by vacuum or electroslag- consumable remelting.
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Forming. Fittings may be formed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining or any combination of these processes.
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Heat Treatment. All fittings are heat treated in accordance with the heat treatment table. All welding must be done prior to heat treatment.
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Class WP-S Fittings. Fittings marked WP-S are of seamless construction and meet all the requirements of ANSI B16.9, B16.11, B16.28 or MSS SP-79.
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Class WP-W Fittings. Fittings marked WP-W contain welds with or without filler metal. All welds made with filler metal are radiographically examined throughout the entire length. The fittings conform with ANSI B16.9 or B16.28.
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Class WP-WX Fittings. Fittings marked WP-WX are of welded construction and have all welds radiographically examined throughout their entire length. The fittings conform to the requirements of ANSI B16.9 or B16.28.
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Class WP-WU Fittings. Fittings marked WP-WU are of welded construction and have all welds are ultrasonically examined throughout their entire length. The fittings conform to the requirements of AMSI B16.9 or B16.28.
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Class CR fittings. These fittings are manufactured to the requirements of MSS SP-43. They need not be radiographically or ultrasonically examined.
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Small Fittings machined from bar shall be restricted to NPS 4 or smaller. No elbows, return bends or tees shall be machined from bar. Supplementary requirement S7 applies to caps machined form bar.
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Stub ends. Weld build up is permitted to dimensionally correct unfilled areas produced during cold forming of stub ends. Weld repair is also permitted. Radiographic examination is not necessary if prescribed procedures are followed. Stub ends may also be produced with the entire lap added as weld metal to a straight pipe section. (Refer to the full specification for details).
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Weld Materials: Any deposited weld metal should conform in its alloy content to that of the fitting base metal, or as given in the AWS filler metal specification A5.4 or A5.9. Exceptions are when welding on 304, 304L or 321 base metal, in which cases the weld metal should correspond to AWS Types E308 (ER308L), or E347 (ER347 or ER321) respectively. Also, when welding on S31725, S31726, S31254, or S33228 the weld metal should correspond to the base metal or to UNS W86112/N06625.
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Marking. MSS SP-25 applies. For butt-welded fittings marking includes: manufacturers name or trademark, schedule number or nominal wall thickness, size, class, grade, heat number or heat identification, supplementary requirement ‘S’ suffix unless threaded or socket-welded. For cold-format stub ends with weld build up: add ‘WBU’ to grade. For threaded or socket welding fittings: pressure rating may be used in place of schedule number. Bar coding may be used as a supplementary identification.
Ordering Information
Item
Notes
Specification number
ASTM A 403/A 403M – 96
Quantity
Number of fittings of each kind
Description of fitting and nominal dimension.
Standard or special
Grade of steel
Selected from chemical composition table
Class
WP or CR. WP fittings may also be WP-S, WP-W, WP-WX or WP-WU.
If not specified, furnished at the option of the supplier.
Additional requirements
Refer to optional and supplementary requirements S1 to S10
Finish and Repair
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Surface discontinuities deeper than 5% of nominal wall thickness to be removed.
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Defect removal by grinding or machining. The following are removed:
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Surface discontinuity as above.
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Surface checks (fishscale) deeper than 1/64 in (0.4 mm).
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Mechanical marks deeper than 1/16 in (1.6 mm).
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When removal reduces wall thickness below 871/2% of nominal, the fitting is rejected or repaired.
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-
Defect repair by welding
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Permitted for fitting made to specifications.
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Purchaser agreement is necessary for weld repair of special fitting.
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Repair is limited to 10% of outside surface and 331/3% of nominal wall thickness.
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All weld repairs are examined using liquid penetration test.
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There should be no cracks in prepared cavities, or in finished weld, or in the surrounding
Mandatory Testing
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-
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Heat Analysis. Composition of each cast or heat is required to conform to the chemical composition table. Weld material conforms to the same requirements, except as identified in Manufacture above.
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Tensile Tests. Tension test made on starting material is acceptable provided the heat treatments are the same. If they differ, one test is made on material representative of the fitting from each heat and in the same heat treated condition as the fittings.
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Visual Inspection. All fittings are to be examined for surface imperfections.
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Hydrostatic Test. Not required. However: Class WP fittings shall be capable of withstanding pressures prescribed for the specified matching pipe or equivalent material. Class CR fittings shall be capable of withstanding pressures based on ratings in MSS SP-43, except for CR tees fabricated using intersection welds which shall withstand pressures based on 70% of the ratings in MSS SP-43.
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Nondestructive Testing. Radiographically or ultrasonically examined in accordance with the Class of fitting. (See Manufacture above).
Optional and Supplementary Requirements
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S1 Product Analysis. Analysis made for each heat of base metal and from each lot number of welding material if appropriate
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S1 Tension Test. One test on one fitting or representative test piece per lot. A weld should be at the centre of any test piece, if the fitting is of welded construction.
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S1 Intergranular Corrosion Bend Test. One test on one fitting or representative test piece per lot. A weld should be at the centre of and at position of maximum bend, if the fitting is of welded construction. Grades 304L, 316L, 317L, 321, 347 and 348 are tested after a heat treatment capable of producing sensitisation.
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S1 Ultrasonic Test. Each fitting of the raw material from which each fitting is made will be ultrasonically tested to determine soundness.
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S1 Photomicrographs. A photomicrograph at 100 diameters shall be made, for information only, of the base metal structure from one fitting per lot. The lot is to be defined by the purchaser.
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S1 Surface Finish. Machined surfaces will have a maximum roughness of 250 in (6.4 m). Other surfaces will be suitable for ultrasonic tests.
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S1 Liquid Penetrant Test. All surfaces will be liquid penetrant tested in accordance with Practice E 165.
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S1 Special Filler Metal. Fittings shall be welded using either filler metal AWS Type E16-8-2 or ER16-8-2 and shall be marked WP
HRW or CR HRW.
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S1 Special Fittings. Fittings whose size and shape do not completely conform to the dimensions specified in the ANSI or MSS specification will meet all the other requirements of these specification and be marked S9.
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S1 Stabilisation Treatment. Grades 321, 347 and 348 to receive a stabilisation treatment instead of a solution anneal. Stabilisation treatment will hold the fitting at 1500 – 1600 °F {815 – 870 °C) for a minimum of 2 hrs/in (4.7 min/mm) of thickness. Marking is to include S10 after grade.
Tensile Requirements
|
Grade |
UNS |
Tensile Strength, mi |
n |
Yield Strength, mi |
n |
Elongation min% in 4D |
|
|
ksi |
MPa |
ksi |
MPa |
Longit % |
Trans% |
||
|
All |
All |
75 |
515 |
30 |
205 |
28 |
20 |
|
304L |
S30403 |
70 |
485 |
25 |
170 |
28 |
20 |
|
316L |
S31603 |
70 |
485 |
25 |
170 |
28 |
20 |
|
304N |
S30451 |
80 |
550 |
35 |
240 |
28 |
20 |
|
316N |
S31651 |
80 |
550 |
35 |
240 |
28 |
20 |
|
S31726 |
80 |
550 |
35 |
240 |
28 |
20 |
|
XM-19 |
S20910 |
100 |
690 |
55 |
380 |
28 |
20 |
|
S31254 |
94-119 |
650-820 |
44 |
300 |
28 |
20 |
|
|
S34565 |
115 |
795 |
60 |
415 |
28 |
20 |
|
|
S33228 |
73 |
500 |
27 |
185 |
28 |
20 |
Notes
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Grades or UNS designations are prefixed with letters ‘WP’ or ‘CR’ to indicate class.
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All = All grades listed in the chemical composition table except as identified.
Heat Treatment
Grade1
UNS
Temperature
°F
Temperature °C
Treatment
All
All
1900
1040
Solution annealing until chromium carbides are in solution. Cooling at a rate to prevent reprecipitation.2
321
S32100
1900-2100
1040-1150
Solution annealing as above
321H
S32109
1925-2100
1050-1150
Solution annealing as above
347
S34700
1900-2100
1040-1150
Solution annealing as above
347H
S34709
1925-2100
1050-1150
Solution annealing as above
348H
S34809
1925-2100
1050-1150
Solution annealing as above
XM-19
S20910
1900
1040
Solution annealing as above
S31254
2100
1150
Solution annealing as above
S34565
2050-2140
1120-1170
Solution annealing as above
S33228
2050
1120
Solution annealing as above
Notes:
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Grades or UNS designations are prefixed with letters ‘WP’ or ‘CR’ to indicate class.
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All fittings will be supplied heat treated. All welding will be done before heat treatment. Fittings machined directly from solution-annealed forgings and bar need not be resolution annealed.
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All = All grades listed in the chemical composition table except as identified in this table.
Chemical Compositions
|
Composition Percentage, max or range |
||||||||||
|
Grade |
UNS |
&DUERn C |
0DQJDQHVe Mn |
3KRVSKRUXs P |
6XOSKXUS |
6LOLFRn Si |
1LFNHl Ni |
&KURPLXmCr |
0RO\EGHQXm Mo |
Note |
|
304 |
S30400 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
8.0-11.0 |
18.0-20.0 |
– |
|
|
304H |
S30409 |
0.04- 0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
8.0-11.0 |
18.0-20.0 |
– |
|
|
304L |
S30403 |
0.035 |
2.00 |
0.045 |
0.030 |
1.00 |
8.0-13.0 |
18.0-20.0 |
– |
2 |
|
304LN |
S30453 |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
8.0-10.5 |
18.0-20.0 |
– |
1 |
|
304N |
S30451 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
8.0-11.0 |
18.0-20.0 |
– |
1 |
|
309 |
S30900 |
0.15 |
2.00 |
0.045 |
0.030 |
1.00 |
12.0-15.0 |
22.0-24.0 |
– |
|
|
310 |
S31000 |
0.15 |
2.00 |
0.045 |
0.030 |
1.50 |
19.0-22.0 |
24.0-26.0 |
– |
|
|
316 |
S31600 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
10.0-14.0 |
16.0-18.0 |
2.00-3.00 |
|
|
316H |
S31609 |
0.04- 0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
10.0-14.0 |
16.0-18.0 |
2.00-3.00 |
|
|
316LN |
S31653 |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
11.0-14.0 |
16.0-18.0 |
2.00-3.00 |
1 |
|
316L |
S31603 |
0.035 |
2.00 |
0.045 |
0.030 |
1.00 |
10.0-16.0 |
16.0-18.0 |
2.00-3.00 |
2,3 |
|
316N |
S31651 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
11.0-14.0 |
16.0-18.0 |
2.00-3.00 |
1 |
|
317 |
S31700 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
11.0-15.0 |
18.0-20.0 |
3.0-4.0 |
|
|
317L |
S31703 |
0.030 |
2.00 |
0.045 |
0.030 |
1.00 |
11.0-15.0 |
18.0-20.0 |
3.0-4.0 |
|
|
321 |
S32100 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
– |
4 |
|
321H |
S32109 |
0.04- 0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
– |
5 |
|
347 |
S34700 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
– |
6 |
|
347H |
S34709 |
0.04- 0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
– |
7 |
|
348 |
S34800 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
– |
6,8 |
|
348H |
S34809 |
0.04- 0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
– |
7,8 |
|
XM-19 |
S20910 |
0.060 |
4.0-6.0 |
0.040 |
0.030 |
1.00 |
11.5-13.5 |
20.5-23.5 |
1.5-3.00 |
9,10 |
|
S31254 |
0.020 |
1.00 |
0.030 |
0.010 |
0.80 |
17.5-18.5 |
19.5-20.5 |
6.0-6.5 |
11 |
|
|
S31725 |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
13.5-17.5 |
18.0-20.0 |
4.0-5.0 |
12 |
|
|
S31726 |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
13.5-17.5 |
17.0-20.0 |
4.0-5.0 |
13 |
|
|
S34565 |
0.03 |
5.0-7.0 |
0.030 |
0.010 |
1.00 |
16.0-18.0 |
23.0-25.0 |
4.0-5.0 |
14 |
|
|
S33228 |
0.04- 0.08 |
1.0 |
0.020 |
0.015 |
0.30 |
31.0-33.0 |
26.0-28.0 |
– |
15 |
Note
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Grades or UNS designations are prefixed with letters ‘WP’ or ‘CR’ to indicate class.
Composition Notes
1 Nitrogen 0.10-0.16%
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Carbon 0.040% max is necessary where many drawing passes are required, as with outside diameter <0.5 in (12.7 mm), or nominal wall thickness <0.049 (1.2 mm).
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On pierced tube, Nickel may be 11.0-16.00% 4 Titanium >5 x Carbon, 0.70% max
-
Titanium >4 x Carbon, 0.70% max
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Niobium + Tantalum: >10 x Carbon, 1.10% max
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Niobium + Tantalum: >8 x Carbon, 1.00% max
-
Tantalum 0.10%
-
Niobium + Tantalum 0.10-0.30%, Vanadium 0.10-0.30%
10 Nitrogen 0.20-0.40%
11 Nitrogen 0.18-0.22%, Copper 0.50-1.00%
12 Nitrogen 0.10% max, Copper 0.75%
13 Nitrogen 0.10-0.20%, Copper 0.75%
14 Nitrogen 0.4-0.6%, Niobium 0.1%
15 Cerium 0.05-0.10%, Aluminium 0.025%, Niobium 0.6-1.0%
Note
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-
Niobium is sometimes referred to as Columbium