What standards apply to Q195 steel used in automobiles?
National Standards: GB/T 700 (basic), GB/T 912 (cold-rolled), GB/T 3274 (hot-rolled); automakers often develop their own enterprise standards based on these (e.g., surface, dimensional, performance tolerances).
What are the surface quality requirements for Q195 steel used in automobiles?
Cold-rolled sheet: No oxidation, pitting, or scratches on the surface; surface finish Ra≤0.8μm; suitable for electrophoresis/painting. Hot-rolled sheet: Slight oxide scale is permissible; used for non-appearance parts.
What are the cost advantages of Q195 in automobile manufacturing?
Approximately 10%–15% lower than Q235, and 30%–50% lower than high-strength steel, suitable for low-cost strategies in mass-produced vehicles.
What are the common quality defects of Q195 automotive parts?
Stamping cracks, weld porosity, dimensional deviations, surface corrosion, and unacceptable springback; strict control of material condition and process parameters is required.
How to test the key performance characteristics of Q195 for automotive applications?
Tensile test (yield/tensile strength/