Comprehensive analysis of S355J0 seamless steel tube

1、 Basic Information

Material grade: S355J0 (European standard EN 10210, non alloy structural steel).

Manufacturing process: Hot rolled/cold drawn seamless steel pipes, suitable for high load-bearing structures.

2、 Core Features

Chemical composition (typical values)

Carbon (C): ≤ 0.22%

Manganese (Mn): ≤ 1.60%

Silicon (Si): ≤ 0.55%

Phosphorus (P), sulfur (S): ≤ 0.035%

Mechanical performance

Yield strength: ≥ 355 MPa

Tensile strength: 470-630 MPa

Elongation rate (A5): ≥ 22%

Impact toughness: 27J (at room temperature, longitudinal specimen)

3、 Standards and specifications

Main standards:

EN 10210-1/2 (Hot rolled structural steel pipes)

EN 10216 (Seamless pipes for pressure purposes, specific grades to be considered)

Equivalent brand:

National standard GB/T 8162: Similar to Q355B (but not completely equivalent)

ASTM A106: Gr. B (requires comparison of composition and performance differences)

4、 Typical applications

Building structures: bridge supports, trusses, high-rise building frames.

Mechanical engineering: lifting equipment, hydraulic cylinders, transmission shafts.

Energy sector: Wind turbine tower components (subject to low-temperature toughness requirements).

5、 Processing and usage suggestions

Weldability: Good, it is recommended to use low hydrogen welding rods and preheat to 100-150 ℃ (when the thickness is greater than 20mm).

Cold processing: It can be bent or expanded, and the deformation rate needs to be controlled to avoid cracking.

Corrosion resistance: Suitable for dry environments without special protection. For humid/corrosive environments, it needs to be coated or replaced with weather resistant steel (such as S355J2W).

6、 Precautions

Standard update: Confirm the latest specifications in the project location (such as EN 10210:2017 replacing the old version).

Procurement parameters: Clearly define delivery status (normalizing/N, or hot rolling), dimensional tolerances, and testing requirements (such as ultrasonic testing).

Alternative materials: If higher toughness is required, S355J2 (-20 ℃ impact energy ≥ 27J) can be considered.