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Pipe Fittings, Pipe Fittings Materials, Technical Library

BW Fittings Materials (ASTM A234, A403, A815)

BW Fittings Materials (ASTM A234, A403, A815)

The main pipe fittings materials are ASTM A234 (carbon and low-alloy steel fittings), ASTM A403 (stainless steel fittings, example SS304 and SS316), and ASTM A815 (duplex and super duplex pipe fittings). The chemical composition and the mechanical properties of these specifications are illustrated in this post.

 

CARBON AND ALLOY STEEL PIPE FITTINGS: ASTM A234

The ASTM A234 specification covers carbon steel and alloy steel pipe fittings (butt weld) for high-temperature service. A234 WPA, WPC and, WPC fittings match ASTM A53, ASTM A106 and, API 5L Gr. B pipes. A234 WP1 to WP91 butt weld fittings match ASTM A335 chrome-moly pipes.

The ASTM A420 specification covers low-temperature carbon steel butt weld fittings to match ASTM A333 Gr.3 and ASTM A333 Gr. 6 pipes; the ASTM A860 specification (WPHY42, WPHY52, WPHY56, WPHY60) covers high yield wrought carbon steel fittings that match high yield API 5L Gr. X42, X52, X56, X60 pipes.

Pipe Fittings Materials: ASTM A234 for Carbon and Alloy Steel Butt Weld Fittings

ASTM A234 CHEMICAL COMPOSITION

Chemical composition of ASTM A234 Carbon and Alloy Steel Fittings
Grade C Mn P max S max Si Cr Mo Ni Cu Others
WPB
(1,2,3,4,5)
0.30
max
0.29-1.06 0.050 0.058 0.10
min
0.40
max
0.15
max
0.40
max
0.40
max
V 0.08
max
WPC
(2,3,4,5)
0.35
max
0.29-1.06 0.050 0.058 0.10
min
0.40
max
0.15
max
0.40
max
0.40
max
V 0.08
max
WP1 0.28
max
0.30-0.90 0.045 0.045 0.10-0.50 0.44-0.65
WP12 CL1 0.05-
0.20
0.30-0.80 0.045 0.045 0.60
max
0.80-1.25 0.44-0.65
WP12 CL2 0.05-
0.20
0.30-0.80 0.045 0.045 0.60
max
0.80-1.25 0.44-0.65
WP11 CL1 0.05-
0.15
0.30-0.60 0.030 0.030 0.50-1.00 1.00-1.50 0.44-0.65
WP11 CL2 0.05-
0.20
0.30-0.80 0.040 0.040 0.50-1.00 1.00-1.50 0.44-0.65
WP11 CL3 0.05-
0.20
0.30-0.80 0.040 0.040 0.50-1.00 1.00-1.50 0.44-0.65
WP22 CL1 0.05-
0.15
0.30-0.60 0.040 0.040 0.50
max
1.90-2.60 0.87-1.13
WP22 CL3 0.05-
0.15
0.30-0.60 0.040 0.040 0.50
max
1.90-2.60 0.87-1.13
WP5 CL1 0.15
max
0.30-0.60 0.040 0.030 0.50
max
4.0-6.0 0.44-0.65
WP5 CL3 0.15
max
0.30-0.60 0.040 0.030 0.50
max
4.0-6.0 0.44-0.65
WP9 CL1 0.15
max
0.30-0.60 0.030 0.030 1.00
max
8.0-10.0 0.90-1.10
WP9 CL3 0.15
max
0.30-0.60 0.030 0.030 1.00
max
8.0-10.0 0.90-1.10
WPR 0.20
max
0.40-1.06 0.045 0.050 1.60-
2.24
0.75-1.25
WP91 0.08-
0.12
0.30-0.60 0.020 0.010 0.20-0.50 8.0-9.5 0.85-1.05 0.40
max
V 0.18- 0.25
Nb 0.06-0.10
N 0.03-0.07
Al 0.02 max(6)
Ti 0.01 max(6)
Zr 0.01 max(6)
WP911 0.09-
0.13
0.30-0.60 0.020 0.010 0.10-0.50 8.0-9.5 0.90-1.10 0.40
max
V 0.18-0.25
Nb 0.060-0.10
N 0.04-0.09
Al 0.02 max(6)
B 0.0003-0.006
W 0.90-1.10
Ti 0.01 max(6)
Zr 0.01 max(6)

Notes:

  1. Fittings from bar or plate 0.35 max carbon.
  2. Fittings from forgings 0.35 max Carbon and 0.35 max Silicon with no minimum.
  3. For each reduction of 0.01% below the specified Carbon maximum, an increase of 0.06% Manganese above the specified maximum is permitted, up to a maximum of 1.35%.
  4. The sum of Cu, Ni, Niobium, and Moly shall not exceed 1.00%.
  5. The sum of Niobium and Moly shall not exceed 0.32%.
  6. Applies to heat and product analyses

 

ASTM A234 MECHANICAL PROPERTIES

Tensile and Yield Strength ASTM A234 for Carbon and Alloy Steel Fittings WPB WPC,

WP11-CL2

WP11-CL1,

WP22-CL1

WP5-CL1

WP9-CL1

WP11-CL3,

WP22-CL3

WP5-CL3

WP9-CL3

WP91
Tensile strength, minimum unless a range is given ksi (MPa) 60 (415) 70 (485) 60 (415) 75 (520) 90 (620)
Yield strength, min ksi (MPa) (0.2% offset or 0.5% extension under-load) 35 (240) 40 (275) 30 (205) 45 (310) 60 (415)

 

Elongation ASTM A234 for Carbon and Alloy Steel Fittings WPB,
WPC, WP11, WP22
WP91
  Longitud. Transverse Longitud. Transverse
Standard
round specimen, or small proportional specimen, min % in 4 D
22 14 20 13
Rectangular specimen for wall thickness 5/16″ and over, and
for all small sizes tested in full section; min % in 2 in.
30 20
Rectangular specimen for wall thickness less than 5/16″;
min % in 2 in (1/2″ wide specimen)
see note

Note:  For each 0.79 mm decrease in wall thickness below 7.94 mm, a deduction of 1.5 % for longitudinal and 1.0 % for transverse from standard values is permitted

 

STAINLESS STEEL PIPE FITTINGS: ASTM A403

The ASTM A403 specification covers austenitic stainless steel butt weld fittings to match ASTM A312 TP304, TP316, TP321, etc., pipes.

Pipe Fittings Materials: ASTM A430 for stainless steel pipe fittings

ASTM A403 CHEMICAL COMPOSITION

Chemical Composition of ASTM A403 Stainless Steel
Grade UNS
nbsp;
C
strong>(1)
Mn
strong>(1)
P
strong>(1)
S
strong>(1)
Si
strong>(1)
Ni Cr Mo Ti N
strong>(2)
Others
WPXM-19 S20910 0.06 4.0-6.0 0.045 0.030 1.0 11.5-13.5 20.5-23.5 1.50-3.0 0.20-0.40 (3)
WP304 S3040 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
WP304L S30403 0.030
(4)
2.0 0.045 0.030 1.0 8.0-12.0 18.0-20.0
WP304H S30409 0.04-0.10 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
WP304N S30451 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0 0.10-0.16
WP304LN S30453 0.030 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0 0.10-0.16
WP309 S3090 0.20 2.0 0.045 0.030 1.0 12.0-15.0 22.0-24.0
WP310S S3108 0.08 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0
WPS31254 S31254 0.020 1.0 0.030 0.010 0.80 17.5-18.5 19.5-20.5 6.0-6.5 0.18-0.22 Cu0.50-1.0
WP316 S3160 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0
WP316L S31603 0.030 align=”center”(4) 2.0 0.045 0.030 1.0 10.0-14.0
(5)
16.0-18.0 2.0-3.0
WP316H S31609 0.04-0.10 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0 0.10-0.16
WP316N S31651 0.08 2.0 0.045 0.030 1.0 10.0-13.0 16.0-18.0 2.0-3.0 0.10-0.16
WP316LN S31653 0.030 2.0 0.045 0.030 1.0 10.0-13.0 16.0-18.0 2.0-3.0 0.10-0.16
WP317 S3170 0.08 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
WP317L S31703 0.030 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
WPS31725 S31725 0.030 2.0 0.045 0.030 1.0 13.5-17.5 18.0-20.0 4.0-5.0 0.20
WPS31726 S31726 0.030 2.0 0.045 0.030 1.0 13.5-17.5 17.0-20.0 4.0-5.0 0.10-0.20
WPS31727 S31727 0.030 1.0 0.030 0.030 1.0 14.5-16.5 17.5-19.0 3.8-4.5 0.15-0.21 Cu2.8-4.0
WPS32053 S32053 0.030 1.0 0.030 0.010 1.0 24.0-26.0 22.0-24.0 5.0-6.0 0.17-0.22
WP321 S3210 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (6)
WP321H S32109 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (7)
WPS33228 S33228 0.04-0.08 1.0 0.020 0.015 0.30 31.0-33.0 26.0-28.0 Ce 0.05-0.10 Al 0.025Nb 0.6-0.10
WPS34565 S34565 0.030 5.0-
7.0
0.030 0.010 1.0 16.0-18.0 23.0-25.0 4.0-5.0 0.40-0.60 Nb 0.10
WP347 S3470 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (8)
WP347H S34709 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (9)
WP348 S3480 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 Nb+Ta= 103(C)-1.10Ta 0.10Co 0.20
WP348H S34809 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 Nb+Ta= 83(C)-1.10Ta 0.10Co 0.20
WPS38815 S38815 0.030 2.0 0.040 0.020 5.5-
6.5
13.0-17.0 13.0-15.0 0.75-1.50 Cu 0.75-1.50Al 0.30

Notes:

  1. Maximum, if not otherwise indicated.
  2. The method of analysis for Nitrogen is agreed between the purchaser and manufacturer.
  3. Niobium 0.10-0.30%; Vanadium, 0.10-0.30%.
  4. For small diameter or thin walls, a Carbon maximum of 0.040% is mandatory in grades TP304L and TP316L. Small outside diameter tubes are those less than 0.50 in. [12.7 mm] 5) in outside diameter and light wall tubes as those less than 0.049 in. [1.24 mm] in average wall thickness.
  5. On pierced tubing, the Nickel may be 11.0-16.0%.
  6. 5 X (C+N2)-0.70.
  7. 4 X (C+N2) -0.70.
  8. The Niobium % shall be ten times above the Carbon content and not more than 1.10%.
  9. The Niobium % shall be eight times above the Carbon content and not more than 1.10%.

 

ASTM A403 MECHANICAL PROPERTIES

Tensile and Elongation Requirements ASTM A403 WP304, WP316 WP304L, WP316L
Yield Strength, min, ksi [MPa] 30 [205] 25 [170]
Tensile Strength, min, ksi [MPa] 75 [515] 70 [485]
Elongation Longitudinal 28 28
Transverse 20 20

 

DUPLEX AND SUPER DUPLEX PIPE FITTINGS: ASTM A815

The ASTM A815 specification covers duplex and super duplex butt weld fittings to match ASTM A790 and ASTM A928 pipes.

Pipe Fittings Materials: ASTM A815 for Duplex and Superduplex Pipe Fittings

ASTM A815 CHEMICAL COMPOSITION

DUPLEX FITTINGS CHEMICAL COMPOSITION (UNS S31803, UNS S32205)

Grade C Mn Si P S Cr Mo Ni N Fe
S31803 0.030 max 2.00 max 1.00 max 0.030 max 0.020 max 22.0 – 23.0 3.0 – 3.5 4.50 – 6.50 0.14 – 0.20 63.72 min
S32205 0.030 max 2.00 max 1.00 max 0.030 max 0.020 max 21.0 – 23.0 2.50 – 3.50 4.50 – 6.50 0.8 – 0.20 63.54 min

 

DUPLEX FITTINGS MECHANICAL PROPERTIES (UNS S31803, UNS S32205)

Grades Density (g/cm 3) Density (lb/in 3) Melting Point (°C) Melting Point (°F)
S31803 / S32205 7.805 0.285 1420 – 1465 2588 – 2669

 

SUPER DUPLEX FITTINGS CHEMICAL COMPOSITION (UNS S32750, UNS S32760)

Grade C Mn Si P S Cr Mo Ni N Fe
S 32750 0.030 max 1.20 max 0.80 max 0.035 max 0.020 max 24.00 – 26.00 3.00 – 5.00 6.00 – 8.00 0.24 – 0.32 58.095 min
S 32760 0.05 max 1.00 max 1.00 max 0.030 max 0.010 max 24.00 – 26.00 3.00 – 4.00 6.00 – 8.00 0.20 – 0.30 57.61 min

 

SUPER DUPLEX FITTINGS MECHANICAL PROPERTIES  (UNS S32750, UNS S32760)

Grades Density (g/cm 3) Density (lb/in 3) Melting Point (°C) Melting Point (°F)
S32750 / S32760 7.8 0.281 1350 2460

 

PIPE FITTINGS MATERIALS MATCHING CHART

The chart shows the matching material grades for ASME B16.9, MSS SP 43 butt weld fittings, ASME B16.11 forged fittings (socket weld and threaded) and steel pipes.

Materials Forged Fittings
Materials
Butt Weld Fittings Materials Steel Pipes Materials
Carbon Steel A181-Gr.1 A181-Gr.2 A234-WPA WPB WPC
Moderate, high temp. service A105-Gr.1 A105-Gr.2 A106-Gr.B/API 5 LB
Low temp. service A350-LF1 A350-LF2 A420-WPL6 A33-Gr.6/A 671
Carbon -1/2 Moly Alloy Steel
High Temp Service A182-F1 A234-WP1
Low Temp Service
1/2Cr-1/2Mo Alloy Steel A182-F2
1/2Cr-1/2Mo-1 Alloy Steel
3/4Cr-1 Mo-3/4NI Alloy Steel
1Cr-1/2Mo Alloy Steel A182-F12 A234-WP12
1Cr-1 Mo-Vd Alloy Steel A404-F24
1-1/4Cr-1/2Mo Alloy Steel A182-F11 A234-WP11
1-1/4Cr-1/2Mo-Vd Alloy Steel
2-1/4Cr-1/2Mo-Vd Alloy Steel A182-F22 A234-WP22
3Cr-1 Mo Alloy Steel A182-F21
5Cr-1/2Mo Alloy Steel A182-F5 A234-WP5
5Cr-1/2Mo-Si Alloy Steel
7Cr-1/2Mo Alloy Steel A182-F7 A234-WP7
9Cr-1 Mo Alloy Steel A182-F9 A234-WP9
13Cr Alloy Steel A182-F6
Stainless Steel 304
Standard A182-F304 A403-WP304 A312-TP304
Low Carbon A182-F304-L A403-WP304-L A312-Tp304L
High Temp Service A182-F304-H A403-WP304-H A312-TP304H
Type 309 Stainless Steel A403-WP309
Type 310 Stainless Steel A182-F310 A403-WP310 A312-TP310
Type 316 Stainless Steel
Standard A182-F316 A403-WP316 A312-TP316
Low Carbon A182-F316-L A403-WP316-L A312-TP316L
High Temp Service A182-F316-H A403-WP316-H A312-TP316H
Type 317 Stainless Steel
Type 321 Stainless Steel
Standard A182-F321 A403-WP321
High Temp Service A182-F321-H A403-WP321-H
Type 347 Stainless Steel
Standard A182-F347 A403-WP347
High Temp Service A182-F347-H A403-WP347-H
Type 348 Stainless Steel
Standard A182-F348 A403-WP348
High Temp Service A182-F348-H
20 Ni-8 Cr Alloy A182-F10

 

EUROPEAN VS ASTM PIPE FITTINGS MATERIALS

The table shows the equivalent ASTM and European pipe fittings materials grades.

Butt Weld Fittings Materials Comparison Chart
Werkstoff Number European Grade ASTM Grade
CARBON STEEL FITTINGS MATERIALS
1.0254 St 37.0 S235
– –
1.0305 St 35.8/I P235GH (1.0345) A 234 Grade WPA
1.0305 St 35.8/III P235GH (1.0345)
1.0405 St 45.8/I P265GH (1.0425) A 234 Grade WPB
1.0405 St 45.8/III P265GH (1.0425)
ALLOY STEEL FITTINGS MATERIALS
1.5415 15 Mo 3 16Mo3 A 234 Grade WP1
1.7335 13 CrMo 4 4 13CrMo4-5 A 234 Grade WP11, WP12
1.7380 10 CrMo 9 10 10CrMo9-10 A 234 Grade WP22
1.7362 12 CrMo 19 5 X11CrMo5 A 234 Grade WP5
– – A 234 Grade WP9
1.4903  – X10CrMoVNb9-1 A 234 Grade WP91
LOW-TEMPERATURE CARBON STEEL FITTINGS MATERIALS
1.5637 10 Ni 14 12Ni14 A 420 Grade WPL3
1.0356 TTSt 35 N P215NL (1.0451)
1.0356 TTSt 35 V
– – A 420 Grade WPL6
HIGH YIELD CARBON STEEL FITTINGS MATERIALS
– –
1.0486 StE 285 A860 Grade WPHY42
1.0562 StE 355 P355N A860 Grade WPHY52
1.8902 StE 420 A860 Grade WPHY60
1.8905 StE 460 A860 Grade WPHY70
HIGH YIELD CARBON STEEL FITTINGS MATERIALS
1.0457 StE 240.7
1.0484 StE 290.7 L290NB A860 Grade WPHY42
1.0582 StE 360.7 L360NB A860 Grade WPHY52
1.8972 StE 415.7 L415NB A860 Grade WPHY60
– –
STAINLESS STEEL FITTINGS MATERIALS
1.4541 X 6 CrNiTi 18 10 X6CrNiTi18-10 A 403 Grade WP321
1.4571 X 6 CrNiMoTi 17 12 2 X6CrNiMoTi17-12-2 A 403 Grade WP316Ti
1.4301 X 5 CrNi 18 10 X5CrNi18-10 A 403 Grade WP304
1.4306 X 2 CrNi 19 11 X2CrNi19-11 A 403 Grade WP304L
1.4307  – X2CrNi18-9 A 403 Grade WP304L
1.4401 X 5 CrNiMo 17 12 2 X5CrNiMo17-12-2 A 403 Grade WP316
1.4404 X 2 CrNiMo 17 13 2 X2CrNiMo17-12-2 A 403 Grade WP316L
1.4462 X 2 CrNiMoN 22 5 3 X2CrNiMoN22-5-3 UNS S 31803 (Duplex)
1.4529 X 1 NiCrMoCuN 25 20 6 X1NiCrMoCuN25-20-7 UNS N 08926
1.4539 X 1 NiCrMoCuN 25 20 5 X1NiCrMoCu25-20-5 UNS N 08904 (904L)
1.4547  – X1CrNiMoCuN20-18-7 UNS S 31254

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