Precision bright seamless steel pipe is a kind of high-precision steel pipe material processed by fine drawing or cold rolling. Due to the advantages of no oxide layer on the inner and outer walls of the precision bright tube, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no flaring, no cracks in flattening, etc., it is mainly used to produce products for pneumatic or hydraulic components, such as cylinders or The oil cylinder can be a seamless pipe or a welded pipe. The chemical composition of the precision bright tube is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.
Brief introduction of precision bright tube process: high-quality carbon steel, finish rolling, non-oxidative bright heat treatment (NBK state), non-destructive testing, the inner wall of the steel tube is brushed with special equipment and washed with high pressure, the anti-rust oil on the steel tube is used for anti-rust treatment, and both ends are sealed For dust-proof treatment.
The main features of the precision bright tube: the inner and outer walls of the steel tube have high precision and high smoothness, the steel tube has no oxide layer after heat treatment, the inner wall is clean, the steel tube is subjected to high pressure, the cold bending does not deform, the flaring and flattening have no cracks, and various complex deformations can be made. and mechanical processing. Steel pipe color: bright white with high metallic luster. Main uses of precision bright tube: Automobiles, machinery parts and other machinery that have high requirements on the accuracy and smoothness of steel tubes. And the current users of precision steel pipes are not only users who have higher requirements for precision and finish, because precision bright seamless steel pipes have high precision and can maintain tolerances within 2–8 wires, so many machining users save labor, materials, With the loss of time, the seamless steel pipe or round steel is slowly being transformed into a precision bright seamless steel pipe.
Common specifications of precision bright tube
10# 0.07~0.13 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035 20# 0.17~0.23 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035 35# 0.32~0.39 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035 45# 0.42~0.50 0.17~0.37 0.50~0.80 ≤0.035 ≤0.035 40cr 0.37~0.44 0.17~0.37 0.50~0.80 ≤0.035 ≤0.035 0.08~1.10 25Mn 0.22~0.2 0.17~0.37 0.70~1.00 ≤0.035 ≤0.035 ≤0.25 37Mn5 0.30~0.39 0.15~0.30 1.20~1.50 ≤0.015 ≤0.020
Calculation formula for the pressure of the seamless bright tube Tensile strength) / (outer diameter * coefficient) 2: Knowing the outer diameter of the precision bright seamless steel pipe and the calculation method of the wall thickness under pressure: Wall thickness = (pressure * outer diameter * coefficient) / (2 * tensile strength of steel pipe material Strength) Three: Representation method of pressure coefficient of precision bright seamless steel pipe: Pressure P<7Mpa coefficient S=8 7<steel pipe pressure P<17.5 coefficient S=6 Pressure P>17.5 coefficient S=4