Precision seamless steel pipe is a high-precision steel pipe that has been cold-rolled or cold-drawn; full name: cold-rolled or cold-drawn precision seamless steel pipe. Due to the advantages of no oxide layer on the inner and outer walls of precision seamless steel pipes, no leakage under high pressure, high precision, high finish, no deformation after cold bending, no cracks after expansion, flattening, etc., it is mainly used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders, all of which are seamless pipes. The chemical composition of precision seamless steel pipes is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr.

First, an overview of precision steel pipes: Precision seamless steel pipe is a high-precision steel pipe that has been cold-rolled or cold-drawn; 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 pipes, no leakage under high pressure, high precision, high finish, no deformation after cold bending, no cracks after expansion, flattening, etc., it is mainly used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders, all of which are seamless pipes. The chemical composition of precision seamless steel pipes includes carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr.

Second, the difference between precision steel pipes and seamless steel pipes
1. The obvious difference from seamless steel pipes is high dimensional accuracy, which can reach 0.05mm.
2. The surface finish of the inner and outer diameters of precision steel pipes is high, and customers can use them directly without processing; while ordinary seamless steel pipes require customers to lathe, polish, etc.

Material name: alloy structural steel Grade: 14CrMnMoVB precision seamless steel pipe ● Characteristics and application range of precision seamless steel pipes: It is a weldable low-alloy high-strength steel with a yield strength of 686MPa, which has good comprehensive mechanical properties. After different heat treatments, different comprehensive mechanical properties can be obtained to suit different working conditions. Its corrosion resistance is higher than that of low-carbon steel (about three times). It is suitable for manufacturing various pressure vessels and parts such as engineering mining machinery and trucks.

●Chemical composition of precision seamless steel pipe:
Carbon C: 0.10～0.15Silicon Si: 0.17～0.37Manganese Mn: 1.10～1.60Sulfur S: ≤0.035Phosphorus P: ≤0.035Chromium Cr: 0.90～1.30Vanadium V: 0.03～0.06Molybdenum Mo: 0.32～0.40Boron B: 0.002～0.006

●Mechanical properties of precision seamless steel pipe:
Tensile strength σb (MPa): 868Conditional yield strength σ0.2 (MPa): 713Elongation δ5 (%): 17Elongation δ10 (%): 11Short-section reduction ψ (%): 62Impact toughness value αku (J/cm2): 5 Sample size: a certain sample

●Precision seamless steel pipe heat treatment specifications and metallographic structure: Heat treatment specifications: 900℃ normalizing, 600℃ tempering. Metallographic structure: tempered bainite, a small amount of tempered troostite.

●Features of precision seamless steel pipes
1. Smaller outer diameter.
2. High precision and small batch production.
3. Cold-drawn finished products have high precision and good surface quality.
4. The cross-sectional area of ​​the steel pipe is more complex.
5. The steel pipe has better performance and the metal is denser.

●Implementation standards of precision seamless steel pipes
GB/T3639, GB/T8713, DIN2391-2, EN 10305-1, HK15-2000

●Application of precision seamless steel pipes
Used in manufacturing mechanical structures, hydraulic equipment, and automotive parts