Welded fittings are essential components used to connect and join pipes, valves, and other pipe elements. They provide a strong, leak-proof connection by using welding techniques, ensuring durability and reliability in various industrial applications. Due to their robust structure and high strength, welded fittings are widely used across different sectors such as petrochemical, chemical processing, power generation, and more.
Table of contents
Welded Steel Fittings Specification
Dimensions of Welded Fittings
Welded Pipe Fittings Applications
Seamless and Welded Fittings Standards
HS Code for Welded Pipe Fittings
Welded Carbon Steel Fittings Benefits
ASME B16.9 Buttweld Elbow Dimension
What is welded fittings?
Difference Between Seamless and Welded Fittings
Welded Tee Dimension
Welded Pipe Reducer Dimensions
Welded Steel Fittings Specification
Seamless Fitting Size
1/2″ – 10
Welded fittings Size Range
1/2″ – 48″
ASTM Standards
ASME B16.9
Butt Weld Fittings Connection
Welding
Welded Black Iron Fittings Bending Radius
3D
2D
6D
1D
5D
8D
10D
Welded Pipe Fittings Wall Thickness
SCH10
SCH20
XS
SCH140
SCH60
SCH120
STD
SCH40
SCH80
Welded Carbon Steel Fittings Density
7.84 (Mg/m3)
Welded Steel Pipe Fittings Temperature
1100°C (2010°F)
ASTM A403 Welded Fittings Testing Methods
HIC tested
Hyrdrostatic test
100% Radiography tested
Ultrasonic test
PMI test
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View ASTM A403 welded fittings sizes, dimensions and application
ASTM A403 welded fittings are forged and rolled austenitic stainless steel fittings commonly used in pressure piping systems. They are ideal for use in engineering industries, energy transformation plants, and other demanding environments where corrosion resistance and strength are critical.
The ASTM A403 standard includes various grades of austenitic stainless steel. The following table outlines the available dimensions of welded fittings:
Dimensions of Welded Fittings
NPS
In.
OD
Wall Thickness T
90° Elbows
90° Returns
45°
Elbows
Crosses
Caps
Tees
Stub Ends
XS
ST
XX
160
Short R
A
Long R
A
Short R
K
Long R
K
B
C
E
C
G
F
1
1.315
0.179
0.133
0.358
0.250
1
1-1/2
1-5/8
2-3/16
7/8
–
1-1/2
1-1/2
2
4
3/4
1.050
0.154
0.113
0.308
–
–
1-1/8
–
1-11/16
7/16
–
1-1/4
1-1/8
1-11/16
3
1-1/2
1.900
0.200
0.145
0.400
0.281
1-1/2
2-1/4
2-7/16
3-1/4
1-1/8
2-1/4
1-1/2
2-1/4
2-7/8
4
1/2
0.840
0.147
0.109
–
–
–
1-1/2
–
1-15/16
5/8
–
1
1
1-3/8
3
1-1/4
1.660
0.191
0.140
0.382
0.250
1-1/4
1-7/8
2-11/16
2-3/4
1
1-7/8
1-1/2
1-7/8
2-1/2
4
2
2.375
0.218
0.154
0.436
0.344
2
3
3-3/16
4-3/16
1-3/8
2-1/2
1-1/2*
2-1/2
3-5/8
6
3
3.500
0.300
0.216
0.600
0.438
3
4-1/2
4-3/4
6-1/4
2
3-3/8
2*
3-3/8
5
6
2-1/2
2.875
0.276
0.203
0.552
0.375
2-1/2
3-3/4
3-15/16
5-3/16
1-3/4
3
1-1/2
3
4-1/8
6
3-1/2
4.000
0.318
0.226
0.636
–
3-1/2
5-1/4
5-1/2
7-1/4
2-1/4
3-3/4
2-1/2*
3-3/4
5-1/2
6
5
5.563
0.375
0.258
0.750
0.625
5
7-1/2
7-3/4
10-5/16
3-1/8
4-7/8
3*
4-7/8
7-5/16
8
4
4.500
0.337
0.237
0.674
0.531
4
6
6-1/4
8-1/4
2-1/2
4-1/8
2-1/2*
4-1/8
6-3/16
6
6
6.625
0.432
0.280
0.864
0.719
6
9
9-5/16
12-5/16
3-3/4
5-5/8
3-1/2*
5-5/8
8-1/2
8
10
10.750
0.500
0.365
1.000
1.125
10
15
15-3/8
20-3/8
6-1/4
8-1/2
5*
8-1/2
12-3/4
10
8
8.625
0.500
0.322
0.875
0.906
8
12
12-5/16
16-5/16
5
7
4*
7
10-5/8
8
12
12.750
0.500
0.375
1.000
1.312
12
18
18-3/8
24-3/8
7-1/2
10
6*
10
15
10
16
16.000
0.500
0.375
–
–
16
24
24
32
10
12
7*
12
18-1/2
12
14
14.000
0.500
0.375
–
–
14
21
21
28
8-3/4
11
6-1/2*
11
16-1/4
12
18
18.000
0.500
0.375
–
–
18
27
27
36
11-1/4
13-1/2
8*
13-1/2
21
12
22
22.000
0.500
0.375
–
–
–
33
–
44
13-1/2
16-1/2
10
16-1/2
–
–
20
20.000
0.500
0.375
–
–
20
30
30
40
12-1/2
15
9*
15
23
12
24
24.000
0.500
0.375
–
–
24
36
36
48
15
17
10-1/2
17
27-1/4
12
30
30.000
0.500
0.375
–
–
30
45
45
60
18-1/2
22
10-1/2
22
–
–
26
26.000
0.500
0.375
–
–
–
39
–
52
16
19-1/2
10-1/2
19-1/2
–
–
34
34.000
0.500
0.375
–
–
–
51
–
–
21
25
10-1/2
25
–
–
42
42.000
0.500
0.375
–
–
42
63
–
–
26
–
12
–
–
–
36
36.000
0.500
0.375
–
–
36
54
54
–
22-1/4
–
10-1/2
26-1/2
–
–
Welded Pipe Fittings Applications
Petrochemical
Chemical processing
Water treatment
Power generation
Oil and gas
Refer various welded fittings standards such as ASME B16.9 and MSS SP-43
Welded fittings manufactured according to ASME B16.9 cover scope, size, material, pressure ratings, etc. Meanwhile, those fabricated under MSS SP-43 are typically used in low-pressure and corrosion-resistant applications.
The following table provides more details about the ASTM standards for seamless and welded fittings, including how they are used and in what form or condition.
Seamless and Welded Fittings Standards
ASTM Standards
A403
A815
A234
A420
A361
A366
A363
Material Specification
Wrought Austenitic
Stainless Steel Piping Fittings
Wrought Ferritic, Ferritic
Austenitic, and
Martensitic Stainless Steel Piping Fittings
Wrought Carbon Steel
Alloy Steel for Moderate
High Temperature Service
Wrought Carbon Steel
Alloy Steel for Low Temperature Service
Wrought Aluminum
Aluminum
Alloy Welding Fittings
Wrought Nickel
Nickel Alloy Fittings
Seamless
Welded Unalloyed Titanium
Titanium Alloy Welding Fittings
Welded steel pipe fittings are available in beveled and plain ends
Welded pipe fittings with beveled ends are often used by manufacturers manually or through automated processes to ensure stability. This allows for a perfect combination with butt-weld fittings, making the welding process simpler and more efficient.
Welded steel fittings with plain ends are commonly used for creating strong, leak-proof joints. Their ends are smooth and do not have any threaded parts.
HS Code for Welded Pipe Fittings
Product
HS Code
Welded fittings
73072300
Welded Carbon Steel Fittings Benefits
Allow thin thickness (SCH 10 or SCH 10S)
Various sizes (1/4″ to 24″)
Many possibilities for twisting and ease of welding
Butt weld saves more cost than socket weld or threaded
ASME B16.9 Buttweld Elbow Dimension
NPS
1
01 1/4
01 1/2
2
02 1/2
3
03 1/2
4
5
6
O.D mm
33.4
42.2
48.3
60.3
73
88.9
101.6
114.3
141.3
168.3
inch
1.32
1.66
1.9
2.38
2.88
3.5
4
4.5
5.56
6.62
A mm
25
32
38
51
64
76
89
102
127
152
inch
1
1.25
1.5
2
2.5
3
3.5
4
5
6
NPS
8
10
12
14
16
18
20
22
24
O.D mm
219.1
273
323.8
355.6
406.4
457
508
559
610
inch
8.62
10.75
12.75
14
16
18
20
22
24
A mm
203
254
305
356
406
457
508
559
610
inch
8
10
12
14
16
18
20
22
24
Welded Buttweld Pipe Fittings can be manufactured in various types and wall thickness
They can be manufactured in several types and wall thicknesses to suit a wide range of applications and environments. Different piping systems operate under varying temperature and pressure conditions, requiring pipe fittings that offer suitable strength and longevity.
Therefore, manufacturers can provide pipe fittings based on the required wall thickness—whether thicker or thinner—ensuring they can withstand certain pressures without damage.
What is welded fittings?
Components used to connect, direct, or change the direction of pipes
Provides strong, durable, and leak-proof connections
suitable for high pressures and harsh environments
Types: elbows, tees, reducers, stub end, and caps
Welded black iron fittings connect pipes using a weld for a robust connection
Welded black iron fittings connected to pipes create a permanent, leak-proof connection. This type of connection offers resistance against high pressure and temperature applications.
The robust connection involves using heat to melt the welded black iron fitting and joint, resulting in a permanent attachment. This process ensures high strength, leak resistance, and safety for the pipe fitting.
Difference Between Seamless and Welded Fittings
Features
Seamless Fittings
Welded Fittings
Manufacturing
Made from single piece of metal without joints or seams
Made by welding together separate pieces of metal
Strength
stronger due to the absence of seams
slightly reduced strength at the weld joint
Durability
durable and less prone to failure
susceptible to weld defects
Cost
more expensive
less expensive
Pressure ratings
Higher
Lower
Flexibility
Less
designed with more variations in shape and size
Surface finish
smooth surface finish
may vary depending on the welding process
Heat Treatment
requires less heat treatment post-production
requires heat treatment post-welding to relieve stresses
Weight
consistent weight due to uniform wall thickness
depend on the thickness of welds and additional components.
