Precision seamless steel pipe is called cold-rolled precision seamless steel pipe. Because the inner and outer walls of precision seamless steel tubes have no oxide layer, high pressure and no leakage, high precision, high smoothness, no deformation of cold bending, flaring, flattening without cracks, etc., they are mainly used to produce pneumatic or hydraulic components, such as Cylinders or cylinders are all made of seamless tubes. The chemical composition of precision seamless steel tubes is C, Si, Mn, S, P, Cr.

The difference between precision steel pipe and seamless steel pipe

1. The obvious difference with the seamless steel pipe is: high dimensional accuracy, which can reach 0.05mm.

2. The surface roughness of the inner and outer diameter of the precision steel pipe is high, and the customer can directly use it without processing; and the ordinary seamless steel pipe requires the customer to perform latheing and polishing.

Grade: 14CrMnMoVB
Material Name: Alloy Structural Steel
Precision seamless steel pipe characteristics and scope of application: 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). Applicable to the manufacture of various types of pressure vessels and engineering mining machinery and trucks and other components.

Precision seamless steel pipe chemical composition:

C: 0.10 to 0.15, Si: 0.17 to 0.37, Mn: 1.10 to 1.60, S: ≤ 0.035, P: ≤ 0.035, Cr: 0.90 to 1.30, V: 0.03 to 0.06, Mo: 0.32 to 0.40, B: 0.002 to 0.006

Precision seamless steel tube mechanical properties:

Tensile strength σb (MPa): 868
Conditional yield strength σ0.2 (MPa): 713
Elongation δ5 (%): 17
Elongation δ10 (%): 11
Section shrinkage ψ (%): 62
Impact toughness value αku (J/cm2): 5

Precision seamless steel tube heat treatment specifications and metallographic organization: heat treatment specifications: 900 ° C normalizing, 600 ° C tempering. Metallographic organization: tempered bainite and a small amount of tempered sorbite.