Precision seamless steel pipe is a kind of high-precision steel pipe after cold rolling or cold drawing; Full name: cold rolled precision seamless steel pipe. Due to the advantages of no oxide layer on the inner and outer walls of precision seamless steel pipe, no leakage under high pressure, high precision, high finish, no deformation in cold bending, flaring, flattening and no cracks, seamless steel pipe is mainly used to produce products of pneumatic or hydraulic components, such as air cylinder or oil cylinder. The chemical composition of precision seamless steel pipe includes carbon C, silicon Si, manganese Mn, sulfur s, phosphorus P and chromium CR.
Difference between precision steel pipe and seamless steel pipe
1. The obvious difference from seamless steel pipe is that the dimensional accuracy is high, which can reach 0.05mm.
2. The surface finish of inner and outer diameter of precision steel pipe is high, and customers can use it directly without processing; The ordinary seamless steel pipe needs to be processed by lathe and polishing.
Material name: alloy structural steel brand: 14crmnmovb precision seamless steel pipe ● characteristics and scope of application of precision seamless steel pipe: it is a weldable low alloy high strength steel with yield strength of 686MPa, with good comprehensive mechanical properties. After different heat treatment, different comprehensive mechanical properties can be obtained for different working conditions. Its corrosion resistance is higher than that of low carbon steel (about three times). It is suitable for manufacturing all kinds of pressure vessels, engineering and mining machinery, trucks and other parts.
● chemical composition of precision seamless steel pipe:
Carbon C: 0.10 ~ 0.15 silicon Si: 0.17 ~ 0.37 manganese Mn: 1.10 ~ 1.60 sulfur s: ≤ 0.035 phosphorus P: ≤ 0.035 chromium Cr: 0.90 ~ 1.30 vanadium V: 0.03 ~ 0.06 molybdenum Mo: 0.32 ~ 0.40 boron B: 0.002 ~ 0.006
● mechanical properties of precision seamless steel pipe:
Tensile strength σ B (MPA): 868 conditional yield strength σ 0.2 (MPA): 713 elongation δ 5 (%): 17 elongation δ 10 (%): 11 reduction of area ψ (%): 62 impact toughness value α Ku (J / cm2): 5 sample size: a sample
● heat treatment specification and metallographic structure of precision seamless steel pipe: heat treatment specification: 900 ℃ normalizing and 600 ℃ tempering. metallographic structure: tempered bainite + a small amount of tempered sorbite.