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The difference between precision seamless steel pipe and seamless steel pipe

Posted by:Rain Time:2019.08.08 21:53

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.

Precision seamless steel pipe chemical composition:

Carbon C: 0.10 to 0.15, silicon Si: 0.17 to 0.37, manganese Mn: 1.10 to 1.60, sulfur S ≤ 0.035, phosphorus P: ≤ 0.035, chromium Cr: 0.90 to 1.30, vanadium V: 0.03 to 0.06, molybdenum Mo: 0.32 to 0.40, boron 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 Kuku (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 + a small amount of tempered sorbite.


1. The outer diameter is smaller.

2. High precision can be produced in small batches.

3. The cold drawn product has high precision and good surface quality.

4. The cross-sectional area of steel pipes is more complicated.

5. The performance of steel pipe is superior and the metal is dense.

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