Welcome to Qingdao Steel Building Co., Ltd.
02-10
2023
Q235B and Q355B are commonly used structural steel materials, mainly used in fields such as architecture, bridges, and ships. The differences between the two are as follows: 1. Different chemical compositions: Q235B has carbon (C) ≤ 0.22%, manganese (Mn) ≤ 1.4%, silicon (Si) ≤ 0.35%, phosphorus (P) ≤ 0.045%, and sulfur (S) ≤ 0.045%, while Q355B has carbon (C) ≤ 0.20%, manganese (Mn) ≤ 1.70%, silicon (Si) ≤ 0.50%, phosphorus (P) ≤ 0.030%, and sulfur (S) ≤ 0.030%. 2. Different strength: The yield strength of Q355B is 355MPa, which is about 100MPa higher than the yield strength of Q235B. 3. Different toughness: Q355B has better toughness than Q235B and can be used at low temperatures. 4. Different prices: Due to the more optimized composition, better strength and toughness of Q355B, the price is relatively higher compared to Q235B.
Steel grade Q235B equally the following grade :
China (GB) Q235B
Japan (JIS) SS400B
United States (ASTM): Gr.65
International (IOS) E235B
Europe (EN) S235JR
Steel grade Q355B equally the following grade :
China (GB) Q355B
Japan (JIS) SCM440B
United States (ASTM): Gr.50
International (IOS) E355B
Europe (EN) S355JR