Q345A welded pipe characteristics

Q345A welded pipe is a low alloy steel grade widely used in China. The "Q" stands for the yield point of the steel (in MPa), and "345" indicates the minimum yield strength of 345 MPa for the material.

Characteristics of Q345A welded pipe:
- Chemical Composition: Q345A welded pipe typically contains carbon, manganese, silicon, sulfur, phosphorus, and small amounts of other elements such as copper, chromium, and nickel, depending on the specific version of Q345A welded pipe.
- Mechanical Properties:
- Yield Strength: ≥345 MPa
- Tensile Strength: 470-630 MPa
- Elongation: ≥ 20% (depending on the thickness of the material)
- Impact toughness: At least 27 J at -20°C.

Applications of Q345A welded pipe:
- Construction and Structural Engineering: Often used in bridge construction, buildings, and other large-scale infrastructure projects.
- Machinery and Equipment: Used in various machinery components where high strength and weldability are needed.
- Transportation: For pipelines or structural elements in transportation systems like railways, highways, and pipelines.

Key Specifications from the Standard: Dimensions and Tolerances:Outer diameter (OD), wall thickness, and length specifications are provided based on the Q345A welded pipe intended application.Tolerances for the outer diameter and wall thickness are defined to ensure proper fitting and welding.