Q195 mechanical properties

Q195 is a low-carbon structural steel primarily used in construction, bridges, and metal products. Its mechanical properties are key indicators of a material's performance under load. They are as follows:
I. Key Mechanical Properties
Tensile Strength (σb)
Range: 315-430 MPa
Tensile strength is the maximum resistance of a material to tensile fracture. Q195 has moderate tensile strength, making it suitable for withstanding moderate tensile loads.
Yield Strength (σs)
Range: ≥195 MPa (hence the "195" in the name).
Yield strength is the critical stress at which a material begins to undergo plastic deformation. Q195 exhibits significant plastic yield at a load of 195 MPa, making it suitable for processing applications requiring a certain degree of ductility, such as bending and stamping. Elongation (δ)
Range: ≥33% (when the specimen gauge length is 5 times the diameter)
Elongation reflects the material's plastic deformation capacity. Q195's high elongation indicates good plasticity, ease of cold forming, and clear deformation warning before fracture.
Impact Toughness
It generally performs well at room temperature, but has lower low-temperature impact toughness (due to its low carbon content and lack of alloying element strengthening). It is suitable for structural parts in non-cryogenic environments.
Hardness
Brinell hardness (HB) is approximately 100-130, indicating low hardness and good machinability.
II. Correlation between Performance Characteristics and Applications
Advantages: Good plasticity, easy processing (welding, cold bending, etc.), and low cost. Suitable for manufacturing components that require low strength but require formability, such as light steel keels, scaffolding, bolts, nails, and thin plates.
Limitations: Low strength makes it unsuitable for structures bearing heavy loads (such as large bridge girders). III. Implementation Standards
The mechanical properties of Q195 are based on the national standard "GB/T 700-2006 Carbon Structural Steel." While steel of varying thickness may exhibit slight performance differences, core indicators (such as yield strength ≥ 195 MPa) remain consistent.
The above properties demonstrate that Q195 is a typical low-carbon mild steel, primarily characterized by excellent ductility and workability. It is widely used in lightweight structures and everyday metal products.