Features and application:
Q235A good toughness and ductility, have a certain elongation, good weldability and hot workability. Q235A generally used in hot-rolled state, with its rolled steel, steel, steel, steel pipe can be used in the manufacture of welded structure, bridges and general non-critical machine parts such as bolts, rod, rivets, rings and even rod and so on.

Chemical composition:
Carbon C: 0.14 ~ 0.22


Si Si: ≤ 0.30


Manganese Mn: 0.30 ~ 0.65


Sulfur S: ≤ 0.050


Phosphorus P: ≤ 0.045


Chromium Cr: allow the residual content ≤ 0.030


Ni: to allow the residual content of ≤ 0.030


Copper Cu: to allow the residual content ≤ 0.030


Note: deoxidation method: F, b, Z

Mechanical properties
:


Tensile strength σb (MPa): 375 ~ 460


Yield strength σs (MPa): ≤ 16 时: ≥ 235;> 16 ~ 40 time: ≥ 225;> 40 ~ 60 time: ≥ 215;> 60 ~ 100 time: ≥ 205;> 100 ~ 150 time: ≥ 195; > 150 when: ≥ 185


Elongation δ5 (%): ≤ 16 时: ≥ 26;> 16 ~ 40 at: ≥ 25;> 40 ~ 60 at: ≥ 24;> 60 ~ 100 time: ≥ 23;> 100 ~ 150 time: ≥ 22 ;> 150 when: ≥ 21


Sample size: sample thickness (diameter)

Heat treatment and microstructure specifications:
Heat treatment specifications: hot.


Microstructure: ferrite + pearlite.