Precision bright seamless steel pipe is a high-precision steel pipe material that is processed by cold drawing or hot rolling. The main materials are 10, 20, 35, 45, etc. The main categories are precision seamless steel pipe, precision hydraulic seamless steel pipe, cold-drawn precision seamless steel pipe, cold-rolled precision seamless steel pipe, high-precision seamless steel pipe, and precision bright seamless steel pipe. Precision steel pipe is a kind of precision steel pipe that has no oxide layer on the inner and outer walls, can withstand high pressure without leakage, has high precision, high smoothness, no deformation in cold bending, no cracks in flaring and flattening, etc. The main features of precision bright seamless steel pipes are smaller outer diameter, high precision, good surface quality, superior performance and relatively dense metal. There are strict tolerances and roughness requirements for the inner hole and outer wall dimensions of the pipe body. The main implementation standards are GB/T3639 and GB/T8713. Mainly used in the manufacture of mechanical structures, hydraulic equipment, hydraulic and pneumatic cylinders.
Material name: Alloy structural steel Brand: 12MoVWBSiRE bright steel pipe Standard: GB5310-2008
Bright steel pipe characteristics and scope of application: It is a chromium-free multi-element bainitic heat-strength steel. Although steel does not contain chromium, due to the combined effect of multiple elements, steel has high thermal strength, oxidation resistance and structural stability. It can be used as boiler superheater tube with an operating temperature of 580℃, and can also be used in pressure vessels, etc.
Chemical composition of bright steel pipe:
Carbon C: 0.08～0.15 Silicon Si: 0.60～0.90 Manganese Mn: 0.40～0.70 Sulfur S: ≤0.040 Phosphorus P: ≤0.040 Vanadium V: 0.30～0.50 Titanium Ti: Adding amount 0.06 Molybdenum Mo: 0.45～0.65 Boron B: Add Amount (electric furnace) 0.008; (open furnace) 0.010 Tungsten W: 0.15～0.40 Note: RE adding amount 0.15
Mechanical properties of bright steel pipe:
Tensile strength σb (MPa): 540～687 Yield strength σs (MPa): ≥314 Elongation δ5 (%): ≥18 Sample size: longitudinal mechanical properties of the sample
Heat treatment specifications and metallographic structure of bright steel pipes:
Heat treatment specifications: normalizing, 970~1010℃, holding time is 1.5min/wall thickness mm, but not less than 20min. Tempering at 760~780℃, 3h. Metallographic structure: bainite + ferrite.
