ERW carbon steel pipe standards

ERW carbon steel pipe is the abbreviation of resistance welded carbon steel pipe. It features efficient welding, uniform wall thickness and excellent mechanical properties. It is widely applied in fields such as oil and gas pipelines, chemical equipment, building structures and water vapor transportation.

To ensure its safety and reliability under different working conditions, international and industry institutions have successively formulated a series of standards for its chemical composition, mechanical properties, dimensional tolerances and inspection and testing methods, such as ASTM A53, API 5L, EN 10217 and ISO 3183, etc. Together, they have established a full-process quality assurance system for ERW carbon steel pipes from material selection, manufacturing to acceptance.

Common standards of ERW carbon steel pipes

Standard	Typical ERW product/application	Common grades/types	Main purpose
ASTM A53/A53M	ERW steel pipe	Grade A, Grade B; Type E	Water, steam, air, gas and general industrial piping
API 5L	HFW/ERW line pipe	Grade B, X42, X52, X60, X65, X70 and others	Oil and gas pipeline transportation
ASTM A178/A178M	ERW boiler and superheater tubes	Grade A, C, D	Boilers, superheaters and heat-transfer applications
ASTM A214/A214M	ERW heat-exchanger tubes	Carbon steel	Heat exchangers and condensers
ASTM A500/A500M	Welded structural tubing	Grades A–D	Buildings, bridges and structural frames
ASTM A501/A501M	Hot-formed welded/seamless structural tubing	Grades A, B	Structural applications
ASTM A252/A252M	Welded pipe piles	Grades 1–3	Foundations and piling
ASTM A513/A513M	ERW mechanical tubing	Multiple types	Machinery, automotive and mechanical components
EN 10217-1	Welded pressure tubes	Carbon and carbon-manganese steels	Pressure applications
EN 10219-1	Cold-formed welded structural hollow sections	Carbon and fine-grain steels	Structural applications
ISO 3183	Line pipe	Various pipeline grades	Oil and natural gas pipeline systems

What are the chemical compositions of ERW carbon steel pipes?

The chemical composition of ERW carbon steel pipes mainly includes carbon, manganese, phosphorus, sulfur, etc. Other elements can also be added to enhance the overall performance of the pipes. Among them, API 5L and ASTM A53 set standards for the contents of carbon, manganese, phosphorus, sulfur, etc. in steel pipes. Elements such as chromium and nickel can be added to ASTM A513 to enhance the performance of pipes.

Dimensions and processing requirements

Size range: from ½ "(≈21 mm) to up to 24" (≈600 mm) in diameter. Wall thickness can be selected according to Schedule or special requirements.
End treatment methods: Common cutting, chamfering, threading and other forms, which are conducive to the subsequent connection of valves or pipes.
Surface treatment: Common surface treatment methods include black pipe, electroplating, hot-dip galvanizing, anti-corrosion coatings (coal tar pitch, epoxy asphalt, 3PE/PP), and other different anti-corrosion methods.

Commonly used inspection tests

Chemical analysis and mechanical property testing: including yield strength, tensile strength, elongation, etc.
Technical performance testing: such as flattening test, bending test, hardness impact test, etc.
Non-destructive testing (NDT) : Common methods include ET (eddy current), RT (radiographic), and UT (ultrasonic) testing.

Hydrotest: It can effectively ensure the sealing performance and pressure-bearing capacity of the pipeline.

FAQ about ERW carbon steel pipe standards

What is the most common standard for ERW carbon steel pipe?

ASTM A53 is one of the most widely used standards for general-purpose welded carbon steel pipe. For oil and gas pipeline transportation, API 5L is a key standard.

Is ERW a pipe standard?

No. ERW is a manufacturing method, meaning electric resistance welding. The actual product must be manufactured according to a product standard such as ASTM A53, API 5L or ASTM A178.

Is ASTM A53 the same as ERW pipe?

No. ASTM A53 covers both welded and seamless steel pipe. For ERW products, the pipe is generally supplied as Type E under ASTM A53.

Is API 5L pipe ERW?

API 5L covers both seamless and welded line pipe. Therefore, API 5L does not mean ERW by itself. The manufacturing type must be specified separately.

What is the difference between ASTM A53 and API 5L?

ASTM A53 is a general-purpose steel pipe specification covering welded and seamless pipe, while API 5L is specifically designed for line pipe used in pipeline transportation systems and includes requirements for pipeline grades, manufacturing, inspection, testing and traceability.

CENTRAL STEEL can produce various standard ERW carbon steel pipes. Our production line is equipped with advanced equipment such as non-destructive testing (NDT), hydrostatic testing, and heat treatment. The products can be inspected by internationally renowned third-party testing institutions such as SGS, BV, and TuV to ensure that customers receive satisfactory products and services.