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