What is the material of 20# seamless tube?

The material of 20# seamless tube is 20 steel, generally 20# seamless tube. The material of 20# seamless tube is: high quality carbon structural steel brand: 20# seamless tube standard: GB / T 699-198820 characteristics and application scope: the strength is slightly higher than that of 15 steel, little quenching, no tempering brittleness. It is generally used for bending, calendering, bending, hammer arch and other processing.

The welding performance of arc welding and contact welding is good. When gas welding, the thickness is small, and the shape is strict or complex, cracks are easy to occur on the parts. The machinability of cold drawing or normalizing state is better than that of annealing state, which is generally used for manufacturing with low stress and high toughness requirements.

20# seamless tube chemical composition: C: 0.17-0.24, Si: 0.17-0.37, Mn: 0.35-0.65, s: ≤ 0.035, P: ≤ 0.035, Cr: ≤ 0.25, Ni: ≤ 0.25, Cu: ≤ 0.25.

20# seamless tube mechanical properties: tensile strength σ B (MPA): ≥ 410 (42), yield strength σ s (MPA): ≥ 245 (25), elongation δ 5 (%): ≥ 25, area shrinkage ψ (%): ≥ 5, hardness: not heat treated ≤ 156hb, sample size: sample size 25mm.

20# seamless tube heat treatment specification and metallographic structure: heat treatment specification: normalizing, 910 ℃, air cooling. Metallographic structure: ferrite + pearlite.

20# seamless tube delivery status: delivered in non heat treatment or heat treatment (annealing, normalizing or high temperature tempering) status. If the delivery is required to be in heat treatment state, it shall be indicated in the contract, otherwise, it shall be delivered without heat treatment.