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q345 steel properties
q345 steel is a chinese gb standard low alloy high strength structural steel, material density is 7.85 g/cm3, tensile strength is 470-630 mpa, and yield strength is 345 mpa, it has better properties than q235. according to gb/t 1591 – 2008, q345 material has 5 quality grades: q345a, q345b, q345c, q345d and q345e.
q345 steel has good weldability, cold & hot workability and corrosion resistance. widely used in bridges, ships, boilers, pressure vessels, petroleum storage tanks, lifting transport machinery and other high-load welded structural parts.
meaning & designation
“q” is the first letter of chinese pinyin: “qu fu dian”, that means yield point, “345” is the minimum value of yield strength 345 mpa for steel thickness ≤16mm.
datasheet and specification
datasheet and specification are listed in the tables below, including chemical composition, machenical properties, etc.
chemical composition of q345 steel
based on melting analysis.
chemical composition content (≤%) | ||||||||||||||||
steel grade | quality grade | c | si | mn | p | s | cr | ni | mo | cu | ti | n | nb | v | b | als, ≥ |
q345 | q345a | 0.20 | 0.50 | 1.70 | 0.035 | 0.035 | 0.30 | 0.50 | 0.10 | 0.30 | 0.20 | 0.012 | 0.07 | 0.15 | – | – |
q345b | 0.035 | 0.035 | ||||||||||||||
q345c | 0.030 | 0.030 | 0.015 | |||||||||||||
q345d | 0.18 | 0.030 | 0.025 | |||||||||||||
q345e | 0.025 | 0.020 | ||||||||||||||
notes: the p and s contents of profiles and bars can be increased by 0.005%, and the upper limit of grade a steel can be 0.0045%.
material q345 mechanical properties
mechanical properties: yield strength (≥ mpa) | ||||||||||
steel grade | quality grade | d ≤16 | 16< d ≤ 40 | 40 | 63 | 80 < d ≤ 100 | 100 < d ≤ 150 | 150 < d ≤ 200 | 200 < d ≤ 250 | 250 < d ≤ 400 |
q345 | q345a | 345 | 335 | 325 | 315 | 305 | 285 | 275 | 265 | – |
q345b | ||||||||||
q345c | ||||||||||
q345d | 265 | |||||||||
q345e | ||||||||||
notes:
d= thickness or wire diameter in mm;
1 mpa = 1 n/mm2
mechanical properties: tensile strength (mpa) | ||||||||
grade | quality level |
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