ASTM A403 WP304 Seamless Elbow

ASTM A403/A403M WP304/304L Seamless elbows are often used in piping systems that require high corrosion resistance and pressure bearing capacity, such as chemical, petroleum, natural gas, food processing and other industries.

What material is A403 WP304?

A403 304 stainless steel covers the standards for forged austenitic stainless steel fittings for pressure piping applications, including elbows, flanges, tees, reducers, caps and other pipe fittings. Fitting materials should include stainless steel forgings, stainless steel bars, stainless steel plates or seamless or welded stainless steel pipes.

What does A234 WPB Pipe Elbow mean?

ASTM A234 is a standard for pipe fitting materials. But it is to indicate the properties of various alloy steel and carbon steel materials. WPB is the steel grade, where W stands for weldable, B stands for B grade, and P stands for pressure. So it refers to the minimum yield strength.

ASTM A403 WP304 Seamless Elbow Dimensions:
Size: DN250
Thickness: Schedule 40S
End Type: BW
Standard: ASME B16.9

Chemical Composition of ASTM A403 WP304 Pipe Fittings:

C	Mn	Si	P	S	Ni	Cr
0.08	2.0	1.0	0.045	0.03	8-11	18-20

Mechanical Properties of ASTM A403 WP304 Pipe Fittings:

Tensile Strength	Yield Strength	Elongation
515 (Mpa)	205  (Mpa)	40  (%)

Types and Manufacturing Methods of Pipe Fittings:

- Manufacturing Methods: Pipe fittings with both seamless and welded manufacturing methods. Seamless pipe fittings are manufactured by hot working or cold working processes, and have good integrity and uniformity; welded pipe fittings are made by connecting stainless steel plates or pipes by welding processes. The manufacturing process is relatively simple, but the welding quality needs to be strictly controlled.

- Category Distinction: For the "WP" stainless steel grade, there are multiple pipe fitting categories to indicate whether the pipe fitting is a seamless or welded structure, as well as the non-destructive testing method and degree of testing used. However, there is no relevant category division for the "CR" grade, and its specific requirements are specified elsewhere.

Mechanical performance requirements:

- Strength index: Pipe fittings of different steel grades have different mechanical performance requirements such as tensile strength and yield strength. For example, the common 304/304L and 316/316L grades, the yield strength of 304 stainless steel pipe fittings is usually above 205MPa (conditional yield strength σ0.2 (MPa) ≥ 205), 304L is a low-carbon version, and its yield strength is slightly lower than 304, generally around 170MPa; the strength performance of 316 stainless steel pipe fittings is different from that of 304, and the specific values will fluctuate due to standards and actual production.

- Toughness requirements: Depending on the use environment and requirements of the pipe fittings, it may be necessary to meet certain impact toughness indicators, especially for pipe fittings used at low temperatures or special working conditions, additional low-temperature impact tests may be required to verify their toughness and impact resistance under low temperature conditions.

Chemical composition requirements:

- Strict restrictions are imposed on the content of various elements in stainless steel pipe fittings, including major alloying elements such as carbon, chromium, nickel, molybdenum, titanium, and impurity elements such as phosphorus and sulfur. The content of these elements directly affects the corrosion resistance, strength, toughness and other properties of stainless steel.

- Chemical composition analysis of each batch of raw materials is required for production to ensure compliance with standard requirements.

Dimensions and tolerances:

- The dimensional parameters such as outer diameter, wall thickness, length, angle and the corresponding tolerance range of pipe fittings are clearly specified. The dimensional tolerance of pipe fittings should comply with the range specified in the standard to ensure the tightness and interchangeability of the connection between pipe fittings.

- For some pipe fittings of special shapes or sizes, special dimensional control and inspection may be required according to specific design requirements and use conditions.

Non-destructive testing:

- Depending on the grade and use requirements of the pipe fittings, nondestructive testing such as ultrasonic testing, radiographic testing, magnetic particle testing, etc. may be required to detect defects inside and on the surface of the pipe fittings.

- The standard specifies the requirements for non-destructive testing methods, testing frequency, testing scope, and qualified standards to ensure the quality and reliability of pipe fittings.

Marking and packaging:

- The pipe fittings should be marked with information such as production, steel grade, specification, batch number, etc. for easy traceability and management.
- The packaging should be able to protect the pipe fittings from damage and corrosion during transportation and storage, and be easy to load and unload and handle.

ASTM A403/A403M WP304 stainless steel butt welding pipe fittings are widely used in various industries. Husteel can provide SS304/304L pipe fittings and flanges according to customer requirements: sales@hu-steel.com

Read more: ASTM A403 WP316/316L Stainless Steel Butt-weld Elbow or Material selection and application of pipe elbows