ASTM A234 WPB Carbon Steel Elbow 45DEG LR Buttwelded BW B16.9

ASTM A234 WPB Carbon Steel Elbow 45DEG LR Buttwelded BW B16.9

WPB is made of carbon steel material, belonging to ASTM A234 standard, covering forged carbon steel and alloy steel pipe fittings for medium and high temperature applications, suitable for seamless or welded structures such as elbows, tees, pipe caps, etc. The main chemical components are typical components with C ≤ 0.3% Mn 0.29-1.06%,Si≥0.1%, Containing trace amounts of Cr, Ni, Mo, etc., balancing strength and weldability. The tensile strength of WPB material is not less than 415 MPa, the yield strength is not less than 240 MPa, the elongation is 22%, and the hardness is not greater than 197 HB, suitable for medium pressure scenarios.

Chemical Requirements of ASTM A234 WPB

Mechanical Properties of ASTM A234 WPB

ASTM A234 WPB Carbon Steel Elbow Manufacturing process and structural type:

Molding technology:

• Hot pressing: High frequency heating pressing, suitable for mass production, surface oxidation requires treatment.
• Cold pressing forming: Small diameter elbows are commonly used, with high precision but requiring annealing to eliminate internal stress.
• Welding elbows: For large diameters, steel plates are rolled and welded, which is low-cost but requires non-destructive testing.

Structural classification:

• Angle: 45 ° (diversion turn), 90 ° (right angle turn), 180 ° (U-shaped return).
• Curvature radius: long radius (1.5D, low flow resistance) vs short radius (1D, compact space).
• Wall thickness grade: Sch40, Sch80, etc., matched with ASME B16.9 wall thickness series.

ASTM A234 WPB Carbon Steel Elbow Application:

• Petroleum and natural gas industry: WPB carbon steel meets the pressure requirements from room temperature to medium temperature (-29 ° C~343 ° C), and its cost is lower than alloy steel, suitable for non acidic environments. Therefore, it can be used as a connecting component for oil and gas gathering and transportation pipelines, refinery pipeline systems, long-distance pipeline systems, etc.
• Power and energy industry: WPB material has stable performance below 343 ° C and can be used in combination with high-grade materials such as P91/P22 to optimize costs. It can be used for turning the main steam pipe and feedwater pipe of boilers in thermal power plants (such as Sch80 thick walled elbows to withstand high-pressure steam impact); Connect the main pipeline and branch pipeline in the urban centralized heating system (with a 45 ° bend to reduce fluid resistance); It can be used for connecting non radioactive water circulation pipelines in conventional islands in nuclear power auxiliary systems (in accordance with ASME B31.1 specifications).
• Chemical and petrochemical industries: WPB carbon steel elbow can connect reactors with heat exchangers, pumps, and other equipment in the inlet and outlet pipelines of reactors (long radius elbows reduce turbulence and protect catalysts); Transporting acidic and alkaline media in low concentration pipelines with non highly corrosive media (such as weak acids and alkaline solutions) (requiring lining with anti-corrosion coatings); As a turning connection for the pipeline network in compressed air systems (short radius elbows are suitable for compact layouts).

ASTM A234 WPB carbon steel elbows have become a common choice in industries such as petroleum, power, and chemical due to their moderate pressure bearing capacity, easy processing, and controllable cost. But in acidic corrosion, ultra-high temperature (>343 ° C) or ultra-high pressure scenarios, it needs to be replaced with WP series alloy steel (such as WP11/WP22) or stainless steel material (such as ASTM A403). When selecting, it is necessary to comprehensively evaluate the characteristics of the medium, environmental conditions, and industry standards.