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Seamless Buttwelding 45° and 90° Elbows

Seamless Buttwelding 45° & 90° Elbows Specifications

Material Grades

  • Stainless Steel
  • ASTM A403 WP304
  • ASTM A403 WP304L
  • ASTM A403 WP304H
  • ASTM A403 WP316
  • ASTM A403 WP316L
  • ASTM A403 WP316H
  • ASTM A403 WP316Ti
  • ASTM A403 WP317L
  • Super Duplex Steel
  • Nickel Alloys
  • Inconel
  • Incoloy
  • Hastelloy
  • Monel

Elbow Types

  • Seamless 45° Elbow
  • Seamless 90° Elbow
  • Buttwelding 45° Elbow
  • Buttwelding 90° Elbow
  • Long Radius Elbow
  • Short Radius Elbow
  • LR 45° Elbow
  • LR 90° Elbow
  • SR 90° Elbow
  • Seamless Pipe Elbow
  • Butt Weld Elbow
  • Custom Radius Elbow

Manufacturing Standards

  • ASME B16.9
  • ASME B16.28
  • MSS SP-43
  • MSS SP-75
  • ASME B16.25
  • ASTM A403
  • ASTM A234
  • ASTM A420
  • ASTM A815
  • JIS B2312
  • JIS B2313
  • DIN 2605
  • DIN 2615
  • DIN 2616
  • DIN 2617

Size & Schedule

  • Butt Weld: 1/2" to 36"
  • Seamless: 1/2" to 24"
  • DN 15 to DN 600 Seamless
  • Schedule 5S
  • Schedule 10S
  • Schedule 20S
  • Schedule 30
  • Schedule STD
  • Schedule 40S
  • Schedule 60
  • Schedule XS
  • Schedule 80S
  • Schedule 100
  • Schedule 160
  • Schedule XXS

Radius & Configuration

  • Long Radius (LR)
  • Short Radius (SR)
  • 1D Radius
  • 1.5D Radius
  • 2D Radius
  • 3D Radius
  • 5D Radius
  • 6D Radius
  • 10D Radius
  • 15D Radius
  • 20D Radius
  • Custom Radius

Connection & End Type

  • Butt Weld Ends
  • Seamless Ends
  • Beveled Ends
  • ASME B16.25 Bevel
  • Plain Ends
  • Weldable Ends
  • Custom End Preparation

Manufacturing Process

  • Seamless Forming
  • Hot Forming
  • Cold Forming
  • Mandrel Forming
  • Hydraulic Forming
  • Hot Induction Bending
  • Heat Treatment
  • Solution Annealing
  • Precision End Preparation
  • Custom Manufacturing

Mechanical Properties

  • Tensile Strength: 485 MPa Min.
  • Yield Strength: 170 MPa Min.
  • Elongation: 40% Min.
  • Rockwell Hardness: 92 HRB Max.
  • Brinell Hardness: 201 HBW Max.
  • Reference Grade: ASTM A403 WP304L

Chemical Composition

  • Carbon: 0.030% Max.
  • Chromium: 18.0–20.0%
  • Nickel: 8.0–12.0%
  • Manganese: 2.00% Max.
  • Silicon: 0.75% Max.
  • Phosphorus: 0.045% Max.
  • Sulfur: 0.030% Max.
  • Nitrogen: 0.10% Max.
  • Iron: Balance

Physical Properties

  • Density: Approx. 8000 kg/m³
  • Elastic Modulus: Approx. 193 GPa
  • Thermal Conductivity: Approx. 16.2 W/m·K
  • Specific Heat: Approx. 500 J/kg·K
  • Electrical Resistivity: Approx. 720 nΩ·m
  • Thermal Expansion: Approx. 17.2 × 10⁻⁶ /°C

Testing & Inspection

  • Visual Inspection
  • Dimensional Inspection
  • Chemical Analysis
  • Tensile Testing
  • Yield Strength Testing
  • Hardness Testing
  • Hydrostatic Testing
  • Ultrasonic Testing
  • Radiographic Testing
  • Dye Penetrant Testing
  • PMI Testing
  • Material Test Certificate
  • EN 10204 3.1 Certificate

Surface Treatment

  • Pickling
  • Passivation
  • Solution Annealing
  • Bright Annealing
  • Electropolishing
  • Shot Blasting
  • Polishing
  • Sand Blasting
  • Custom Surface Finish

ASME B16.9 Seamless Buttwelding 45° & 90° Elbow Dimensions

DN NPS OD Series A (mm) OD Series B (mm) 45° LR H (mm) 90° LR F (mm) 90° SR K (mm)
15 1/2" 21.3 18 16 38 —
20 3/4" 26.9 25 16 38 —
25 1" 33.7 32 16 38 25
32 1-1/4" 42.4 38 20 48 32
40 1-1/2" 48.3 45 24 57 38
50 2" 60.3 57 32 76 51
65 2-1/2" 76.1 76 40 95 64
80 3" 88.9 89 47 114 76
90 3-1/2" 101.6 — 55 133 89
100 4" 114.3 108 63 152 102
125 5" 139.7 133 79 190 127
150 6" 168.3 159 95 229 152
200 8" 219.1 219 126 305 203
250 10" 273.0 273 158 381 254
300 12" 323.9 325 189 457 305
350 14" 355.6 377 221 533 356
400 16" 406.4 426 253 610 406
450 18" 457.2 478 284 686 457
500 20" 508.0 529 316 762 508
550 22" 559 — 347 838 559
600 24" 610 630 379 914 610

Large Size Seamless Buttwelding Elbow Dimensions

NPS OD Series A (mm) 45° LR H (mm) 90° LR F (mm) 90° SR K (mm)
26" 660 410 991 660
28" 711 442 1067 711
30" 762 473 1143 762
32" 813 505 1219 813
34" 864 537 1295 864
36" 914 568 1372 914
38" 965 600 1448 965
40" 1016 631 1524 1016
42" 1067 663 1600 —
44" 1118 694 1676 —
46" 1168 726 1753 —
48" 1220 758 1829 —

Seamless Buttwelding 45° & 90° Elbow Weight Chart

NPS 45° Sch 5S 45° Sch 10S 45° Sch 40S 45° Sch 80S 90° Sch 5S 90° Sch 10S 90° Sch 40S 90° Sch 80S
1/2" 0.05 0.06 0.08 0.10 0.03 0.04 0.05 0.07
3/4" 0.06 0.07 0.09 0.11 0.04 0.05 0.06 0.07
1" 0.09 0.15 0.18 0.20 0.06 0.10 0.12 0.13
1-1/4" 0.13 0.20 0.25 0.35 0.09 0.13 0.17 0.12
1-1/2" 0.18 0.30 0.40 0.50 0.12 0.20 0.27 0.33
2" 0.30 0.50 0.70 0.90 0.20 0.33 0.47 0.60
2-1/2" 0.60 0.85 1.35 1.80 0.40 0.60 0.90 1.20
3" 0.90 1.30 2.00 2.90 0.60 0.90 1.35 1.90
4" 1.40 2.00 4.00 5.90 0.90 1.35 2.65 3.90
5" 2.90 3.60 6.50 9.70 1.95 2.40 4.35 6.50
6" 4.00 5.00 10.50 16.00 2.70 3.35 7.00 10.50
8" 7.40 10.00 21.50 33.50 4.90 6.70 14.50 22.50
10" 13.60 16.80 38.50 52.50 9.10 11.20 25.60 35.00
12" 23.40 27.00 59.00 79.00 15.60 18.00 39.50 53.00
14" 29.00 35.00 70.00 94.00 19.30 23.50 47.00 63.00
16" 41.30 47.00 95.00 125.00 27.50 31.50 63.50 84.00
18" 51.80 59.00 120.00 158.00 34.50 39.50 80.00 105.00
20" 73.00 85.00 146.00 194.00 49.00 57.00 98.00 129.00
24" 122.00 140.00 210.00 282.00 82.00 94.00 140.00 188.00

Approximate weights in kg per piece based on a density of approximately 8 kg/dm³. Actual weight can vary with material, wall thickness, manufacturing tolerance and end preparation.


Seamless Buttwelding Elbow Angle & Radius

Elbow Type Angle Radius Type Typical Radius Connection
Seamless Butt Weld Elbow 45° Long Radius 1.5D Butt Weld
Seamless Butt Weld Elbow 90° Long Radius 1.5D Butt Weld
Seamless Butt Weld Elbow 90° Short Radius 1D Butt Weld
Custom Seamless Elbow Custom 1D–20D As per drawing Butt Weld

Chemical Composition

Carbon (C)
0.030% Max.
Chromium (Cr)
18.0–20.0%
Nickel (Ni)
8.0–12.0%
Manganese (Mn)
2.00% Max.
Silicon (Si)
0.75% Max.
Phosphorus (P)
0.045% Max.
Sulfur (S)
0.030% Max.
Nitrogen (N)
0.10% Max.
Iron (Fe)
Balance

Physical Properties

Density: Approx. 8000 kg/m³
Elastic Modulus: Approx. 193 GPa
Thermal Expansion: Approx. 17.2 × 10⁻⁶ /°C
Thermal Conductivity: Approx. 16.2 W/m·K
Specific Heat: Approx. 500 J/kg·K
Electrical Resistivity: Approx. 720 nΩ·m

Mechanical Performance

485
MPa (70 ksi)
Tensile Strength
170
MPa (25 ksi)
Yield Strength
40%
Minimum
Elongation
92
HRB Maximum
Rockwell Hardness
201
HBW Maximum
Brinell Hardness
170
MPa Minimum
0.2% Yield Strength


MANUFACTURING

Forging Process

Each flange follows a rigorous 8-step forging and quality-control process to ensure conformance with ASTM A182 and ASME standards.

1

Material Selection

Prime 304 stainless steel billet sourced and certified.

2

Billet Preparation

Heat to 1100°C – 1250°C for optimal forgeability.

3

Forging

Shape billet into flange geometry under controlled pressure.

4

Heat Treatment

Solution anneal at 1040°C – 1120°C, then quench.

5

Machining & Finishing

CNC machining, drilling, and surface finishing.

6

Testing & Inspection

Tensile, hardness, PMI, visual and impact tests performed.