Q390 Steel Properties, Chemical Composition & Equivalent

0 201

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

Get real time updates directly on you device, subscribe now.

Leave A Reply

Your email address will not be published.

We use cookies to improve your experience on our website. By browsing this website, you agree to our use of cookies. Accept Read More