ASTM A234 Pipe fittings type

Steel elbow, steel pipe bend, tee, reducer, cross, cap,weldolet,etc.

About ASTM A234 WPB pipe fittings

ASTM A234 is Standard Specification for steel pipe fittings includes carbon and alloy steel material for moderate and high temperature services. It covers steel fittings of seamless and welded types. Steel Pipe fittings are applied in pressure pipelines and in pressure vessel fabrications. These fittings material consist of  steel, forgings, bars, plates, seamless or HFW (fusion welded) pipe products, with filler metal added.

What is WPB?

W = WELDABLE / wrought

P = RELATED TO P NUMBER OF ALLOY MATERIAL

B = REFER TO MINIMUM YIELD OF MATERIAL

They are available in latest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. Also widely used in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. The grades are ASTM A234 WPB, WPC, WP5, WP9, WP91, WP11, WP12 and WP22.

Specifications of ASTM A234 Pipe fittings

Standards: ANSI /ASME B16.9, B16.28, MSS-SP-43.

Outer Diameter Range: 1/2” to 48”

Thickness Range: SCH 10, sch 20, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160, SCH XXS etc.

Steel pipe fittings manufacturing types in forged, threaded, butt- welded, and seamless.

How to test the quality of ASTM A234 Pipe fittings ?

Detection elements of steel pipe fittings

• Appearance detection, appearance is mainly to intuitively observe whether steel pipeline products have scars, rust, knock marks, cracks, flattening and other defects, whether to meet the relevant product appearance standards.

• Specifications and models shall be tested by measuring tools such as calipers, meters, micrometers and thickness meters in accordance with the contract specifications: pipe outer diameter, inner diameter,wall thickness, length, ellipticity and size error range shall be accurately measured to check whether the products conform to the supply requirements or the national standard sizes of corresponding products.

• Material detection, chemical element analysis of steel pipeline products by spectroscopic, can also be detected by direct reading spectrometer,which is very simple and convenient.

• Hydraulic pressure test, according to the requirements of the pipeline product pressure  to test whether can ensure the actual use of pressure, such as: 10 kg (1MPA steel pipe), 16 kg (16PN flange), and other pressure requirements.

• Flaw detection,  commonly used flaw detection inspection methods are: ultrasonic detection, X-ray detection. Flaw detection can also be divided into: first-level flaw detection, second-level flaw detection, third-level flaw detection, etc., can be carried out according to the actual needs of the third-party testing institutions spot sampling flaw detection.

A234 WPB is the most common material used for carbon steel butt welded fittings.

Specifications  ASTM A234 WPB is the Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.

• ASTM:   A234 WPB

• ASME:   B16.9, B.11

• NACE:    MRO175

• MSS:      SP-83, SP-95

Chemical Composition of ASTM A234 %

1. Fittings made from bar or plate may have 0.35 max carbon.

2. Fittings made from forgings may have 0.35 max Carbon and 0.35 max Silicon with no min.

3. For each reduction of 0.01% below the specified Carbon maximum, an increase of 0.06% Manganese above the specified maximum will be permitted, up to a maximum of 1.35%.

4. The sum of Copper, Nickel, Niobium, and Molybdenum shall not exceed 1.00%.

5. The sum of Niobium and Molybdenum shall not exceed 0.32%.

Stainless Steel Butt Weld Fittings:

Types: Caps - Crosses - Elbows - Reducers - Stub Ends - TeesStainless buttweld fittings are available in 316 and 304 grades.

• Sizes: 1/2" - 36" +

• Schedules: S/5s - XXH

• Alloys: Aluminum - Carbon - Nickel Alloys - Stainless

304/304L (UNS S30400/S30403) 

Chemical Composition%

 Tensile Requirements

Tensile Strength:  (KSI) = 60                                      

Yield Strength:  (KSI) = 35                                          

(KSI converts to MPA {Megapascals} by multiplying by 6.895)         

316/316L (UNS S31600/S31603)  

Chemical Composition%

Tensile Requirements 

• Tensile Strength:  (KSI) = 70                                      

• Yield Strength:  (KSI) = 25                                          

• (KSI converts to MPA {Megapascals} by multiplying by 6.895)