Standard of alloy steel welded pipes

Alloy steel welded pipes are produced according to various international standards to ensure quality, safety, and consistency. These standards define the chemical composition, mechanical properties, manufacturing processes, testing methods, and dimensions of the pipes. Below are some of the key standards that apply to alloy steel welded pipes.

1. ASTM Standards (American Society for Testing and Materials)

ASTM A335: Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service. Though primarily for seamless pipes, this standard is relevant for alloy materials in welded applications as well.

ASTM A691: Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures. It covers welded pipes made from carbon and alloy steel.

ASTM A213: Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes, also applicable to welded pipes in high-temperature environments.

ASTM A928: Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe for Corrosive Environments, which can be applied to certain alloy steel types.

2. ASME Standards (American Society of Mechanical Engineers)

ASME B31.1 and B31.3: Codes for Power Piping and Process Piping, respectively. These codes provide guidelines for alloy steel pipe usage in power generation and process industries.

ASME SA-335: Similar to ASTM A335, this standard is for seamless and welded ferritic alloy-steel pipes used in high-temperature environments.

ASME SA-691: Similar to ASTM A691, it covers the specifications for electric-fusion-welded alloy steel pipes.

3. DIN Standards (German Institute for Standardization)

DIN 17175: Standard for seamless steel pipes made of heat-resistant steels, applicable to alloy steel welded pipes in high-pressure and temperature conditions.

DIN EN 10217-5: Standard for welded steel pipes used under pressure, specifically alloy steel pipes resistant to corrosion and heat.

4. EN Standards (European Standards)

EN 10216-2: Standard for seamless steel tubes for pressure purposes, made of alloy steel with specified elevated temperature properties. It can also apply to welded alloy steel pipes.

EN 10217-2: Standard for welded steel tubes used under pressure, covering non-alloy and alloy steel tubes with specified elevated temperature properties.

EN 10224: Standard for non-alloy and alloy steel pipes used for conveying fluids such as water.

5. ISO Standards (International Organization for Standardization)

ISO 3183: Specification for steel pipe for pipeline transportation systems, including alloy steel pipes used in the oil and gas industry.

ISO 9329-2: Specification for seamless steel tubes for pressure purposes made from non-alloy and alloy steels with specified elevated temperature properties, applicable to welded pipes.

ISO 9362: Specification for welded steel tubes for pressure purposes made from non-alloy and alloy steels with specified elevated temperature properties.

6. JIS Standards (Japanese Industrial Standards)

JIS G3462: Standard for alloy steel tubes used for boilers, heat exchangers, and high-temperature applications.

JIS G3458: Standard for alloy steel pipes used for high-pressure and high-temperature services.

Summary

These standards provide a comprehensive framework to ensure that alloy steel welded pipes meet required mechanical, chemical, and dimensional criteria for their intended applications, ranging from high-pressure environments to corrosive conditions. Depending on the region or industry, different standards may apply, but they all share the common goal of guaranteeing pipe quality and performance.