Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.

In addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless thin-wall steel pipe, special-shaped steel pipe. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the diameter of the cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of the thin-walled pipe can be up to 5mm, the wall thickness is less than 0.25mm, and the size accuracy is higher than that of the hot-rolled seamless pipe.

Product information:

10# Steel pipe Grade :10 # Steel pipe Chemical composition(%):

C: 0.07~0.14，Si: 0.17~0.37，Mn: 0.35~0.65，S: ≤0.04，P: ≤0.035，Cr: ≤0.15，Ni: ≤0.25，Cu: ≤0.25

10# steel pipe mechanical properties:

Tensile strength σb (MPa):≥410

Yield strength σs (MPa):≥205

Elongation δ5 (%):≥25

Section shrinkage (%):≥5

Hardness: No heat treatment,≤156HB

Sample size: 25mm

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20# steel pipe chemical composition

Chemical composition(%):

Carbon C :0.17~0.23 Silicon Si:0.17~0.37 Manganese Mn:0.35~0.65 Sulfur S :≤0.035 Phosphorus P :≤0.035 Chromium Cr:≤0.25 Nickel Ni:≤0.25 Copper Cu:≤0.25

Mechanical properties

Tensile strength σb (MPa):≥410(42) Yield strength σs (MPa):≥245(25) Elongation δ5 (%):≥25 Section shrinkage ψ (%):≥5, hardness: not heat treated,≤156HB, sample size: sample size 25mm

Heat treatment specifications and metallographic structure:

Heat treatment specification: normalizing,910℃, air cooling. Metallographic structure: ferrite + pearlite.

Delivery condition: Delivery in a condition of no heat treatment or heat treatment (annealing, normalizing or high temperature tempering). Where delivery in heat treatment condition is required, it shall be indicated in the contract, and if not indicated, delivery shall be made without heat treatment.

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45# Precision Steel pipe Chemical composition (%)

C: 0.42~0.50%,Si: 0.17~0.37%,Mn: 0.50~0.80%,Cr: ≤0.25%.

#45 Mechanical properties of steel plate

Tensile strength: 600Mpa

Yield strength: 355Mpa

Elongation: 16%

Shrinkage rate: 40%

Impact power: 39J