A234 WPB welded steel pipe fittings
What is A234 WPB welded steel pipe fittings?
A234 WPB welded steel pipe fittings are made of carbon steel or alloy steel pipes, plates and sections with a certain shape which can be used in piping systems plays the function to change the direction or rate of flow. Welded steel pipe fittings include steel elbows (45 and 90 degree), tees, reducers (concentric and eccentric reducers), crosses and caps.
What is ASTM A234 WPB material?
ASTM A234 is the standard specification for steel pipe fittings, which including carbon steel and alloy steel materials for medium to high temperature service. It covers seamless and welded types of steel fittings. Pipe fittings for pressure piping and pressure vessels.These materials include killed steel, forgings, bars, sheets, seamless and welded pipe products. ASTM A234 WPB is one type of carbon steel material mainly service for butt welded steel pipe fittings.
The chemical analysis and mechanical features of ASTM A234 WPB pipe fittings
WPB carbon steel is the most common material used in medium to high temperature pipelines.W for weldable, P for pressure, B for class B, minimum yield strength. Raw materials of ASTM A234 WPB steel pipe fittings can be from steel pipes, such as ASTM A106 Gr.B and C. Also from steel plates, such as ASTM A285 Gr.C, ASTM A516 Gr 70, ASTM A572, etc.
The chemical analysis:
The maximum grade of WPB pipe fittings made of steel pipe or steel plate C is not more than 0.35% .
The carbon content of forged parts is up to 0.35%, the silicon content is up to 0.35%, and there is no minimum value.
For each 0.01 reduction in carbon content, the maximum content of manganese increases by 0.06% and 1.35% respectively.
The total content of copper, nickel, niobium and molybdenum shall not exceed 1.00%.
Niobium + molybdenum shall not exceed 0.32%.
The mechanical features:
Tensile Strength 60,000 pis 415 Mpa
Yield Strength 35,000 psi 240 Mpa
Pressures Ratings: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2000 LBS, 3000 LBS to 9000 LBS.
ASTM A234 steel pipe fittings include seamless and welded fittings.
Seamless steel pipe fittings refer to the raw materials of seamless steel pipe and fittings.
Therefore, the welded steel pipe fittings cover the raw materials of the welded steel pipe fittings.
It should be pointed out that, ASTM A234 does not cover castings, welded parts or parts processed by castings.
Steel pipe fittings manufacturing process
The manufacturing process of pipe fittings includes forging and forming operations. As well as pressing, hammering, punching, extrusion, upsetting, rolling, bending, welding and machining. Or a combination of two or more of these operations.
When manufacturing steel pipe fittings, the following activities should be noted:
1, should not produce harmful defects, welding defects.
2.After molding or forming joints at appropriate temperature, cool them below critical temperature in appropriate environment. No defects shall be allowed in the cooling process.
3.Proper inspection shall be carried out after manufacturing. (water pressure test, hardness test, tensile test, etc.)
The dimension of A234 WPB steel pipe fittings
Standards: ANSI /ASME B16.9, B16.28, MSS-SP-43.
Outer Diameter: 1/2” to 48”
Wall thickness: 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 weld, and seamless.
