Q390 Steel Properties, Chemical Composition & Equivalent

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Pressure vessel made from Q390 steel
Pressure vessel made from Q390 steel

Q390 Steel Introduction and Specifications

Q390 steel is a Chinese steel grade of Low Alloy High Strength Structural Steel, Yield Strength is 390 MPa, parameters are tested with 16mm diameter steel bars or steel plates, tensile strength is 470-630 Mpa, material density is 7.85 g/cm3. According to GB/T 1591-2018, Q390 has 3 quality levels: Q390B, Q390C, Q390D.

The characters and uses of Q390 are similar to Q345 and Q355.

Table-1, Q355 Steel Chemical Composition

(GB/T 1591-2008)

Steel GradeQuality LevelC % (≤)Si % (≤)Mn (≤)P (≤)S (≤)Nb (≤)V (≤)Ti (≤)Cr (≤)Ni (≤)Cu (≤)N (≤)Mo (≤)B (≤)Als (≥)
Q390Q390A0.200.501.700.0350.0350.070.200.200.300.500.300.0150.10
Q390B0.0350.035
Q390C0.0300.0300.015
Q390D0.0300.0250.015
Q390E0.0250.0200.015

(GB/T 1591-2018)

Steel GradeQuality LevelC % (≤)Si (≤)Mn (≤)P (≤)S (≤)Nb (≤)V (≤)Ti (≤)Cr (≤)Ni (≤)Cu (≤)N (≤)Mo (≤)B (≤)
Q390Q390B0.200.551.700.0350.0350.050.130.050.300.500.400.0150.10
Q390C0.0300.030
Q390D0.0250.025

Table-2, Carbon Equivalent (CEV)

steel delivered in hot rolled state (based on smelting analysis)

CEV (Mass fraction ≤%); Nominal thickness or diameter Ø
Steel GradeQuality Grade≤ 3030 < Ø ≤ 6363 < Ø ≤ 150150 < Ø ≤ 250250 < Ø ≤ 400
Q390Q390B0.45 (CEV)0.470.48
Q390C
Q390D

Table-3, Q390 Mechanical Properties (Hot rolled)

Thickness or Dia. (Ø) mm; Yield Strength (≥N/mm2)
Steel GradeQualityØ≤1616< Ø ≤4040 < Ø ≤6363 < Ø ≤ 8080 < Ø ≤ 100100 < Ø ≤ 150150 < Ø ≤ 200200 < Ø ≤ 250250 < Ø ≤ 400
Q390Q390B390380360340340320
Q390C
Q390D
Dia. (Ø) mm; Tensile Strength (N/mm2)
Steel GradeQuality LevelØ≤100100 < Ø ≤ 150150 < Ø ≤ 250250 < Ø ≤ 400
Q390Q390B490 – 650470 – 620
Q390C
Q390D

Table-4, Q390 Steel Elongation

Dia. (Ø) mm; Elongation (%)
Steel GradeSample directionØ≤4040 < Ø ≤ 6363 < Ø ≤ 100100 < Ø ≤ 150150 < Ø ≤ 200250 < Ø ≤ 400
Q390Horizontal20191918
Vertical21202019

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