How is the corrosion resistance of Q235?
Generally speaking, it rusts easily and requires painting/galvanizing for corrosion protection.
What is the difference between Q235 and Q195?
Q195 has a lower yield strength (195MPa), is softer, and has better plasticity; it is used for wire, thin plates, and nails.
What is the difference between Q235 and Q355 (formerly Q345)?
Q355 is a low-alloy high-strength steel with a yield strength ≥355MPa, approximately 50% higher in strength; it is used for heavy-duty/high-rise/crane beams.
What are the European and American equivalents for Q235?
European Standard: S235JR (closest to Q235B)
American Standard: ASTM A36
What is the difference between Q235 and 45# steel?
45# is medium carbon steel (C≈0.45%), which can be quenched and tempered (HRC45～55) and is used for shafts/gears/molds; Q235 is low carbon mild steel.