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What is ASTM A234 WPB

Views: 21     Author: Site Editor     Publish Time: 2022-05-25      Origin: Site

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ASTM A234 steel pipe fittings are widely used in pipeline systems, it includes carbon and alloy steel material for moderate and high temperature services.


A234 WPB buttwelding fittings have two types that seamless and welded. Both of them are applied in pressure pipelines and in pressure vessel fabrications.
These fittings material consist of killed steel, forgings, bars, plates, pipe products.


Tolerance for Buttwelding Fittings


TOLERANCES  FOR  BW FITTINGS

 Nominal  Size

All Fittings1)2)

45 。& 90
Elbows
& Tees, Crosses

3D
Radius
Elbows

Returns

Caps

Reducers
& Lap Joint
Stub Ends

Lap Joint  Stub Ends

DN

NPS

OD 3) 4)

ID 3)

A   B   C   M

A   B

   O

K

   U

E,  E1

H   F

G

R

t

15-65

1/2 -21/2

+1.6
-0.8

± 0.8

± 2

± 3

± 6

± 6

±  1

± 3

± 2

    0
    -1

    0
    -1

+1.6
0

80-90

3-31/2

± 1.6

± 1.6

± 2

± 3

± 6

± 6

±  1

± 3

± 2

    0
    -1

    0
    -1

+1.6
0

100

4

± 1.6

± 1.6

± 2

± 3

± 6

± 6

±  1

± 3

± 2

    0
    -1

    0
    -2

+1.6
0

125-200

5-8

+2.4
-1.6

± 1.6

± 2

± 3

± 6

± 6

±  1

± 6

± 2

    0
    -1

    0
    -2

+1.6
0

250-450

10-18

+4.0
-3.2

± 3.2

± 2

± 3

± 10

± 6

± 2

± 6

± 2

    0
    -2

    0
    -2

+3.2
0

500-600

20-24

+6.4
-4.8

± 4.8

± 2

± 3

± 10

± 6

± 2

± 6

± 2

    0
    -2

    0
    -2

+3.2
0

650-750

26-30

+6.4
-4.8

± 4.8

± 3

± 6

---

---

---

± 10

± 5

---

---

---

800-1200

32-48

+6.4
-4.8

± 4.8

± 5

± 6

---

---

---

± 10

± 5

---

---

---

1300-1500

52-60

+6.4
-4.8

± 4.8

± 5

---

---

---

---

---

---

---

---

---

1600-1700

64-68

+6.4
-4.8

± 4.8

± 5

---

---

---

---

---

---

---

---

---

1800-2000

72-80

+6.4
-4.8

± 4.8

± 5

---

---

---

---

---

---

---

---

---


Grades in ASTM A234


ASTM A234 specification has many grades, such as WPB, WPC, WP5, WP9 WP11, WP12, WP22, WP91 and so on.

In these standard Grade WPB is the most common material used for medium and high temperature pipelines. W means weldable, P means pressure, B is grade b, refer to the minimum yield strength.

The source raw material of ASTM A234 WPB steel pipe fittings may be from steel pipe, such as ASTM A106 Gr.B and C. Also from steel plate, as ASTM A285 Gr.C, ASTM A516 Gr 70, ASTM A572 etc.


A234 WPB Meaning 


W = WELDABLE / WROUGHT

P = RELATED TO P NUMBER OF ALLOY MATERIAL

B = REFER TO MINIMUM YIELD OF MATERIAL


ASTM A234 WPB VS A105


  • ASTM A105 is forging.

  • ASTM A234 WPB is wrought.

  • A105 for flanges & threaded & socket weld fittings.

  • A234 WPB for butt welding fittings.


ASTM A234 Specification


Dimensions

1/2 " to 80" / DN15 to DN2000

Thickness 

Schedule 10, 20, 30, STD, 40, 60, 80, 100, 120, 140, 160, XXS

Product Type

Elbow, Tee, Reducer, Bend, Cap, Cross, Stub End

Material Grade

WPB, WPC, WP5, WP9, WP11, WP12, WP22, WP91, WPR, WP911


Chemical Compostition %

GRADE

C

Mn

P

S

Si

Cr

Mo

WPB

0.30 max

0.29-1.06

0.05

0.058

0.10min

0.40max

0.15max

WPC

0.35max

0.29-1.06

0.05

0.058

0.10min

0.40max

0.15max

WP1

0.28max

0.30-0.90

0.045

0.045

0.10-0.50

...

0.44-0.65

WP12 CL1 & CL2

0.05-0.20

0.30-0.80

0.045

0.045

0.60max

0.80-1.25

0.44-0.65

WP11 CL1

0.05-0.15

0.30-0.60

0.03

0.03

0.50-1.00

1.00-1.50

0.44-0.65

WP11 CL2 & CL3

0.05-0.20

0.30-0.80

0.04

0.04

0.50-1.00

1.00-1.50

0.44-0.65

WP22 CL1 & CL3

0.05-0.15

0.30-0.60

0.04

0.04

0.05max

1.90-2.60

0.87-1.13

WP5 CL1 & CL3

0.15max

0.30-0.60

0.04

0.03

0.05max

4.0-6.0

0.44-0.65

WP9 CL1 & CL3

0.15max

0.30-0.60

0.03

0.03

1.00max

8.0-10.0

0.90-1.10

WPR

0.20max

0.40-1.06

0.045

0.05

...

...

...

WP91

0.08-0.12

0.30-0.60

0.02

0.01

0.20-0.50

8.0-9.5

0.85-1.05

WP911

0.09-0.13

0.30-0.60

0.02

0.01

0.10-0.50

8.5-9.5

0.90-1.10


Mechanical Properties

GRADE

WPB

WPC

WP11CL2

WP12 CL2

WP1

WP11 CL1

WP22 CL1

WP5 CL1

WP9 CL1

WPR

WP11 CL3

WP22 CL3

WP2 CL3

WP9 CL3

WP91

WP911

Tensile Strength [MPa]

415-655

485-655

380-550

415-585

435-605

520-690

585-760

620-840

Yiled Strength min [MPa]

240

275

205

205

315

310

415

440

Heat Treatment

After forming at an elevated temperature, fittings are cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air. Heat treatment temperatures specified are metal (part) temperatures. Heat-treated fittings are to be treated according to paragraph 7 in Specification A960/A960M.

Reference Documents

  • ASTM A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service

  • ASTM A217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service

  • ASTM A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings

  • ASME B16.9 Steel Butt-Welding Fittings

  • ASME B16.11 Forged Steel Fittings, Socket Welding and Threaded


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