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q355 steel (q355b q355c q355d)
q355 steel is a chinese low alloy high strength structural steel, which replaced q345, the material density is 7.85 g/cm3. according to gb/t 1591 -2018, q355 has 3 quality levels: q355b, q355c and q355d. “q” is the first letter of chinese pinyin: “qu fu dian”, which means yield strength, “355” is the minimum value of yield strength 355 mpa for steel thickness ≤16mm, and tensile strength is 470-630 mpa.
datasheet and specification
the tables below shows the q355 material datasheet and specifications such as chemical composition, and mechanical properties.
q355 steel chemical composition (hot rolled)
steel grade | quality grade | c % (≤) | si % (≤) | mn (≤) | p (≤) | s (≤) | cr (≤) | ni (≤) | cu (≤) | n (≤) |
q355 | q355b | 0.24 | 0.55 | 1.6 | 0.035 | 0.035 | 0.30 | 0.30 | 0.40 | 0.012 |
q355c | 0.20 | 0.030 | 0.030 | 0.012 | ||||||
q355d | 0.20 | 0.025 | 0.025 | – |
carbon equivalent (cev)
based on smelting analysis, steel delivered in hot rolled state.
cev (mass fraction ≤%); nominal thickness or diameter (d) | ||||||
steel grade | quality grade | ≤ 30 | 30 < d ≤ 63 | 63 < d ≤ 150 | 150 < d ≤ 250 | 250 < d ≤ 400 |
q355 | q355b | 0.45 (cev) | 0.47 | 0.47 | 0.49 | – |
q355c | – | |||||
q355d | 0.49 | |||||
q355 mechanical properties (hot rolled)
notes:
1 mpa = 1 n/mm2
1 gpa = 1 kn/mm2
yield strength (≥n/mm2), thickness or dia. (d) in mm | ||||||||||
steel grade | quality level | d≤16 | 16< d ≤40 | 40 < d ≤63 | 63 < d ≤ 80 | 80< d ≤ 100 | 100< d≤ 150 | 150 < d≤ 200 | 200 < d ≤ 250 | 250 < d ≤ 400 |
q355 | q355b | 355 | 345 | 335 | 325 | 315 | 295 | 285 | 275 | – |
q355c | – | |||||||||
q355d | 265 | |||||||||
tensile strength (n/mm2), dia. (d) mm | |||||
steel grade | quality level | d≤100 | 100 <
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