What is the difference between Q345 and 20Mn2 seamless steel pipe
What is the difference between 20Mn2 seamless steel pipe and Q345 seamless steel pipe?
Chemical composition difference between 20Mn2 seamless steel pipe and Q345 seamless steel pipe:
Chemical composition of 20Mn2 seamless steel pipe: C: 0.17-0.24, Si: 0.17-0.37, Mn: 1.40-1.80.
The chemical composition of Q345 seamless steel pipe is as follows: C ≤ 0.18, Si ≤ 0.50, Mn ≤ 1.70, P ≤ 0.030, S ≤ 0.025, Nb ≤ 0.07, V ≤ 0.15, Ti ≤ 0.20, Cr ≤ 0.30, Ni ≤ 0.50, Cu ≤ 0.30, N ≤ 0.012, Mo ≤ 0.10, Al ≥ 0.015.
Mechanical properties difference between 20Mn2 seamless steel pipe and Q345 seamless steel pipe:
Mechanical properties of 20Mn2 seamless steel pipe: tensile strength ≥ 785 MPa, yield strength ≥ 590 MPa, elongation after fracture ≥ 10%, section expansion rate ≥ 40%, impact absorption energy ≥ 47J.
The mechanical properties of Q345 seamless steel pipe are: yield strength ≥ 265 MPa, tensile strength 450-600 MPa, elongation after fracture ≥ 17%, impact energy 27J. Q345D seamless pipe has good comprehensive mechanical properties, low-temperature impact toughness, cold stamping, machinability and weldability.
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EN 10210 S355J2H hollow section
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GB/T 18248 35CrMo seamless pipe
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GB/T 18248 34CrMo4 seamless pipe
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GB/T 18248 30CrMo seamless pipe
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GB/T 8163 Q345E seamless alloy s
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GB/T 8163 Q345D seamless alloy s
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GB/T 8163 Q345C seamless alloy s
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GB/T 8163 Q345B seamless steel p
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GB/T 8163 20# seamless steel pip
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EN 10297 42CrMo4 seamless pipe a
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