Q390 Steel Properties, Chemical Composition & Equivalent

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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 Grade Quality Level C % (≤) Si % (≤) Mn (≤) P (≤) S (≤) Nb (≤) V (≤) Ti (≤) Cr (≤) Ni (≤) Cu (≤) N (≤) Mo (≤) B (≤) Als (≥)
Q390 Q390A 0.20 0.50 1.70 0.035 0.035 0.07 0.20 0.20 0.30 0.50 0.30 0.015 0.10
Q390B 0.035 0.035
Q390C 0.030 0.030 0.015
Q390D 0.030 0.025 0.015
Q390E 0.025 0.020 0.015

(GB/T 1591-2018)

Steel Grade Quality Level C % (≤) Si (≤) Mn (≤) P (≤) S (≤) Nb (≤) V (≤) Ti (≤) Cr (≤) Ni (≤) Cu (≤) N (≤) Mo (≤) B (≤)
Q390 Q390B 0.20 0.55 1.70 0.035 0.035 0.05 0.13 0.05 0.30 0.50 0.40 0.015 0.10
Q390C 0.030 0.030
Q390D 0.025 0.025

Table-2, Carbon Equivalent (CEV)

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

CEV (Mass fraction ≤%); Nominal thickness or diameter Ø
Steel Grade Quality Grade ≤ 30 30 < Ø ≤ 63 63 < Ø ≤ 150 150 < Ø ≤ 250 250 < Ø ≤ 400
Q390 Q390B 0.45 (CEV) 0.47 0.48
Q390C
Q390D

Table-3, Q390 Mechanical Properties (Hot rolled)

Thickness or Dia. (Ø) mm; Yield Strength (≥N/mm2)
Steel Grade Quality Ø≤16 16< Ø ≤40 40 < Ø ≤63 63 < Ø ≤ 80 80 < Ø ≤ 100 100 < Ø ≤ 150 150 < Ø ≤ 200 200 < Ø ≤ 250 250 < Ø ≤ 400
Q390 Q390B 390 380 360 340 340 320
Q390C
Q390D
Dia. (Ø) mm; Tensile Strength (N/mm2)
Steel Grade Quality Level Ø≤100 100 < Ø ≤ 150 150 < Ø ≤ 250 250 < Ø ≤ 400
Q390 Q390B 490 – 650 470 – 620
Q390C
Q390D

Table-4, Q390 Steel Elongation

Dia. (Ø) mm; Elongation (%)
Steel Grade Sample direction Ø≤40 40 < Ø ≤ 63 63 < Ø ≤ 100 100 < Ø ≤ 150 150 < Ø ≤ 200 250 < Ø ≤ 400
Q390 Horizontal 20 19 19 18
Vertical 21 20 20 19

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