What Is Q235 Carbon Steel?

Q235 Steel (Q235A Q235B Q235C Q235D)

Q235 steel is a common carbon structural steel widely used in my country. The Q235 material in Chinese standard GB/T 700 is divided into 4 quality grades: Q235A, Q235B, Q235C and Q235D; the density of the steel is 7.85 g/cm3, and the tensile strength is 370-500 MPa; Yield strength is 235MPa (data is for steel bars or steel plates with a diameter less than or equal to 16mm). Since it is mild steel, it can be used directly without heat treatment.

Meaning And Name

"Q" is the first letter of the Chinese Pinyin of "Qifu point", which means yield point.

"235" refers to the minimum yield strength of 235MPa tested when the steel diameter is less than or equal to 16mm.

Features And Applications

Q235 steel has good plasticity, toughness and welding ability, as well as a certain strength and good cold bending properties. Q235 material is usually rolled into wire rod or round steel, square steel, flat steel, angle steel, I-beam, channel steel, other profiles and steel plates. These products are widely used in construction and engineering welded structures for making steel bars or building factories, high-voltage transmission towers, bridges, vehicles, boilers, containers, etc. They can also be used as mechanical parts with low performance requirements, such as rods with low stress. , connecting rods, screws, nuts, ferrules, brackets and brackets, etc.

Chemical Composition Of Q235A, Q235B, Q235C, Q235D Steel

The following table lists the chemical composition of Q235 materials based on thermal analysis.

Q235 Steel Properties

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

Physical Properties

notes:

· 10-6·K-1 = 10-6/K

· 1Ω·mm²/m=1 μΩ·m

· 1 g/cm3=1 kg/dm3=1000 kg/cubic meter

· 1 GPa=1 kN/mm2

· 1 MPa = 1 N/mm2

Mechanical Behavior

Yield strength and tensile strength are listed in the table below.

1 MPa=1 N/mm2

 Minimum Elongation 

Q235 Material Bending Test Results

Q235 Steel Equivalent

S235JRG2 and S235J2G4 are the old names in EN 10025:1993. Since 2004, S235JRG2 has been replaced by the new name S235JR (1.0038) and S235J2G4 has been replaced by S235J2 (1.0117) in EN 10025-2.

You may be interested in Q235 and A36, SS400, S235JR and E250 steel;

Q235 and Q195, Q215 and Q275 steel

Q235 material is equivalent to ASTM, ISO, European EN (Germany DIN EN, British BS EN, French NF EN...), Japanese JIS standards.

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