What is Q235 steel?
Q235 is a common carbon structural steel specified in the Chinese national standard GB/T 700-2006, commonly known as "A3 steel," and is one of the most widely used basic steels.
What does "Q235" mean in the grade designation?
"Q" represents yield strength (the first letter of the pinyin for "屈"). "235" indicates that the yield strength is ≥235MPa when the steel thickness is ≤16mm.
What are the differences between Q235 and Q195, Q215, Q255, and Q275?
Q195/Q215: Lower yield strength, better plasticity, suitable for thin plates, nails, and welded steel pipes;
Q255/Q275: Higher yield strength, stronger than Q235, suitable for medium load-bearing components and anchor bolts.
How does it correspond to international grades?
It is equivalent to ASTM A36 (USA), JIS SS400 (Japan), and S235JR (Europe).
What is the carbon content range?
Grade A has a carbon content of ≤0.22%, Grade B ≤0.20%, Grade C ≤0.18%, and Grade D ≤0.17%, which are classified as low-carbon steel.