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q215 mild steel
q215 steel is a chinese carbon structural steel, divided into 2 quality grades: q215a and q215b, material density is 7.85 g/cm3. “q” is the first letter of chinese spelling of “qu fu dian”, translated as yield strength, “215” is a abbreviation for the unit value “215 mpa”, the tensile strength is 315-430 n/mm2, technical specifications are tested with 16mm diameter steel bars or steel plates.
the latest standard of q215 steel is gb/t 700-2006, the chemical composition and physical properties are equivalent to astm a283/a283m grade c, astm a1011/a1011m cs type b; jis g3101 ss330, jis g3131 sphc.
for q215 material main characteristics and uses, please refer to q195.
q215 chemical composition
chemical composition % | |||||||
steel grade | steel grade | c (≤) | si (≤) | mn (≤) | p (≤) | s (≤) | deoxidation |
q215 | q215a | 0.15 | 0.35 | 1.2 | 0.045 | 0.050 | rimmed / killed |
q215b | 0.15 | 0.35 | 1.2 | 0.045 | 0.045 | ||
quality grade: a < b < c < d
q215 steel mechanical properties
steel grade | quality | yield strength (≥n/mm2) | tensile strength (n/mm2) | elongation (≥%) | impact test (v notch) | ||||||||||
thickness or dia. ø mm | thickness or dia. ø mm | temp. ℃ | absorbed energy (vertical, ≥j) | ||||||||||||
ø ≤16 | 16 < ø ≤ 40 | 40 < ø ≤ 60 | 60 < ø ≤ 100 | 100 < ø ≤ 150 | 150 < ø ≤ 200 | ø ≤40 | 40 < ø ≤ 60 | 60 < ø ≤ 100 | 100 < ø ≤ 150 | 150 < ø ≤ 200 | |||||
q215 | q215a | 215 | 205 | 195 | 185 | 175 | 165 | 335 – 450 | 31 | 30 | 29 | 27 | 26 | – | – |
q215b | +20 | 27 | |||||||||||||
q215 steel bending test results
cold bending test 180° (b=2a) | |||
grade | sample orientation | steel ø of curve center | |
≤ 60mm | 60 < ø ≤ 100 | ||
q215 | vertical | 0.5a | 1.5a |
horizontal | a | 2a | |
b= sample steel width; a= sample diameter or thickness | |||
q215 equivalent
q215 steel equivalent to us astm, japan jis, uk bsi standards
you may also be interested in q215 vs q195, q235 and q275 steel
equivalent (for reference) | |||||||
china | usa | japan | uk | ||||
standard |
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