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Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D

2021-03-02256
Q235 Steel (Q235A Q235B Q235C Q235D)

Q235 steel is a plain carbon structural steel which is widely used in China, Q235 material in Chinese standard GB/T 700 is divided into 4 quality grades: Q235A, Q235B, Q235C and Q235D; Density of this steel is 7.85 g/cm3, tensile strength is 370-500 MPa; yield strength is 235 MPa (data are for steel bar or steel plate diameter ≤ 16mm). Since it’s mild steel, it is used directly without heat treatment.

Meaning and Designation

"Q" is the first letter of Chinese spelling of "Qu Fu Dian", which means Yield Point.
"235" refers to the minimum yield strength 235 MPa tested with steel diameter ≤ 16mm.

Features and Applications

Q235 steel has good plasticity, toughness and weldability, as well as a certain strength, good cold bending performance. Q235 material is usually rolled into wire rod or round steel, square steel, flat steel, angle steel, I beam, channel steel, other sections and steel plates. These products are widely used in construction and engineering welded structures, to make steel bars or build factory buildings, high voltage transmission towers, bridges, vehicles, boilers, containers, etc., and also used as a mechanical part with less demanding performance such as less stressed rods, connecting rods, screws, nuts, ferrules, brackets, and stands, etc.

Data Sheet and Specification

The following tables show Q235A, Q235B, Q235C and Q235D steel datasheet and specification, including chemical composition, physical and mechanical properties, etc.

Q235A, Q235B, Q235C, Q235D Steel Chemical Composition

The table below lists Q235 material chemical composition based on heat analysis.

Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 1

Q235 Steel Properties

The following list summarizes Q235 steel properties including physical and mechanical properties.

Physical Properties

Notes:

  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2
  • Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 2

    Mechanical Properties

    Yield strength and tensile strength are listed in the table below.
    1 MPa = 1 N/mm2

    Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 3

    Minimum Elongation

    Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 4

    Minimum Charpy Impact

    Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 5

    Bending Test Results of Q235 Material

    Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 6

    B= Sample Steel Width; a= Sample Diameter or Thickness.

    Steel rolled with Q195 and Q235B grade rimmed steel, the thickness or diameter of which is not more than 25mm.

    Q235 Steel Equivalent

    S235JRG2 and S235J2G4 are old designations in EN 10025:1993, S235JRG2 is replaced by the new designation S235JR (1.0038), and S235J2G4 replaced by S235J2 (1.0117) in EN 10025-2 since 2004.

    Q235 material equivalent to ASTM, ISO, European EN (German DIN EN, British BS EN, French NF EN…), Japanese JIS standard.

    Note: Q235 India equivalent is E250 in Indian standard IS 2062.

    Q235 Carbon Mild Steel Q235A Q235B Q235C Q235D Materials 7

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