Q235B Steel Plate

Q235B steel plate is a kind of low carbon steel. The national standard GB/T 700-2006 “Carbon Structural Steel” has a clear definition. Q235B is one of the most common steel products in China. It is cheap and can be used for most products that do not require high performance.

Method:
① Consists of Q+number+quality grade symbol+deoxidation method symbol. Its steel number is prefixed with “Q”, which represents the yield point of the steel, and the following number represents the yield point value in MPa. For example, Q235 represents a carbon structural steel with a yield point (σs) of 235 MPa.
②If necessary, a symbol indicating quality grade and deoxidation method can be marked after the steel number. The quality grade symbols are A, B, C, D. Symbol of deoxidation method: F means boiling steel; b means semi-killed steel; Z means killed steel; TZ means special killed steel. Killed steel may not be marked with symbols, that is, both Z and TZ may not be marked. For example, Q235-AF represents Class A boiling steel.
③ Carbon steel for special purposes, such as bridge steel, ship steel, etc., basically uses the expression method of carbon structural steel, but the letter indicating the purpose is added at the end of the steel number.

Chemical Composition
Carbon C: ≤0.20
Silicon Si: ≤0.35
Manganese Mn: ≤1.4
Sulfur S: ≤0.045
Phosphorus P: ≤0.045
Chromium Cr: allowable residual content ≤0.30
Nickel Ni: allowable residual content ≤0.30
Copper Cu: allowable residual content ≤0.30
Note: Deoxygenation method: F, b, Z

Mechanical properties
Yield strength: ≤16mm: ≥235
16-40: ≥225
40-100: ≥215
100—150: ≥195
150-200: ≥185.
Tensile strength: 370-500.
Impact test: Temperature: 20℃: ≥27

Applications:
Q235B has a certain degree of elongation, strength, good toughness and castability, and is easy to stamp and weld. It is widely used in the manufacture of general mechanical parts. Mainly used for welding structural parts with high quality requirements in construction and bridge engineering.

AB difference
The difference between Q235A and Q235B: steels are all carbon steels. In the national standard GB700-88, the material distinction between Q235A and Q235B is mainly in terms of the carbon content of steel. The material of Q235A has a carbon content of 0.14-0.22%;
Q235A board does not do impact test, while Q235B does room temperature impact test with V-notch. Relatively speaking, the mechanical properties of steel made of Q235B are far superior to those of steel made of Q235A.
Under normal circumstances, steel mills mark the finished profiles on the identification plates before they leave the factory. The user can judge whether the material is Q235A, Q235B, or other materials on the identification plate. Design pressure P≤1.6MPa; use temperature 0～350℃; steel plate thickness>=20mm

Q235B Steel Plate Sizes: