ASTM A234 WPB butt-welding concentric reducer is a pipe fitting used in piping systems to change pipe diameters. Its key feature is that the two ends have different diameters while maintaining a coinciding centerline, connected to pipes via butt welding.
Structurally, its gradual tapered design ensures smooth fluid transition from a larger to a smaller diameter (or vice versa), effectively minimizing resistance and turbulence caused by abrupt diameter changes. This design is crucial for maintaining stable fluid flow, particularly in industrial piping systems where flow rate and pressure stability are critical.
Order Specification
Type: Concentric Reducer.
Material: ASTM A234 WPB.
Size: 16 Inch × 10 Inch.
Ends: Butt Weld.
Wall Thichkness: 0.375 Inch × 0.365 Inch.
ASTM A234 Carbon Steel Butt-Welding Concentric Reducer Materials and Characteristics
The ASTM A234 standard classifies carbon steel materials for pipe fittings based on service conditions (such as temperature and pressure), with the most commonly used grades being WPB and WPC. The composition and performance characteristics of each grade are as follows:
WPB Grade: This is the most widely used carbon steel material in the ASTM A234 standard, with a carbon content ≤0.30% and a manganese content of 0.29-1.06%. Through optimized chemical composition and heat treatment processes, its mechanical properties include: tensile strength ≥415 MPa, yield strength ≥240 MPa. It can withstand a temperature range of -29°C to 343°C and is suitable for medium-temperature and medium-pressure piping systems, such as pipelines in petroleum refineries' atmospheric and vacuum distillation units and urban district heating pipelines.
chemical composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V |
| ASTM A234 WPB | MIN | 0.29 | 0.10 | ||||||||
| MAX | 0.30 | 1.06 | 0.050 | 0.058 | 0.40 | 0.15 | 0.40 | 0.40 | 0.08 |
Mechanical properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | HARDNESS |
| ASTM A234 WPB | 415 min | 240 min | 22 min | 197 max |
WPC Grade: This is a medium-carbon steel material with a carbon content ≤0.35% and a manganese content of 0.29-1.06%. It offers higher tensile strength and yield strength (tensile strength ≥485 MPa, yield strength ≥275 MPa), with further improved temperature resistance (capable of withstanding 427°C). It is suitable for high-temperature and high-pressure service conditions, such as steam pipelines in power plants and connecting pipelines for chemical reactors in process plants.
chemical composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V |
| ASTM A234 WPC | MIN | 0.29 | 0.10 | ||||||||
| MAX | 0.35 | 1.06 | 0.050 | 0.058 | 0.40 | 0.15 | 0.40 | 0.40 | 0.08 |
Mechanical properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | HARDNESS |
| ASTM A234 WPC | 485min | 275min | 30 min | 197 max |
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