TG&P Bright Steel Bar

TG&P steel bar (Turned, Ground & Polished) is a high-precision round steel bar that has undergone finishing turning, external cylindrical grinding, and surface polishing, replacing rough hot/cold drawn round steel bars for precision mechanical applications with high requirements for dimensional tolerances, surface finish, and mechanical stability. I. Core Process and Key Indicators - Process: Hot/cold drawn blank → Turning and peeling → External cylindrical grinding and sizing (tolerance up to ±0.01mm) → Polishing (Ra≤0.4μm) → Stress-relief annealing → Non-destructive testing. - Key Indicators: Dimensional tolerance h6-h9; Surface roughness Ra0.1-Ra0.8μm; Roundness ≤0.01mm/m; Straightness ≤0.1mm/m; Hardness uniformity ±2HRC. II. Core Advantages - High dimensional accuracy, reducing machining allowance, improving tool life and production efficiency. - Surface defects-free (no oxide scale, cracks, burrs), fatigue strength increased by 30%-50%. - Low roughness reduces friction loss, suitable for precision mating surfaces in hydraulic systems, seals, bearings, etc. - Sufficient stress relief results in minimal deformation after machining, suitable for critical components such as slender shafts and high-precision gear blanks. III. Common Materials and Specifications - Materials: Medium carbon steel (4140/4340), alloy steel (416/303 stainless steel), bearing steel (52100), free-machining steel etc.