Meaning and Designation
“Q” is the first letter of Chinese spelling of “Qufu dian”, which means Yield Point.
“235” refers to the minimum yield strength 235 MPa tested with steel bar diameter or plate thickness ≤ 16mm.
A, B, C and D represent quality grades.
Minimum Elongation
| Elongation (≥ %); Thickness or Dia. (d) mm | |||||
| Steel Grade | d≤40 | 40< d ≤60 | 60< d ≤100 | 100< d ≤150 | 150< d ≤200 |
| Q235 | 26 | 25 | 24 | 22 | 21 |
Minimum Charpy Impact
| Charpy impact (V notch) | |||
| Steel Grade | Quality | Temperature. °C | Impact energy (longitudinal, ≥ J) |
| Q235 | Q235A | – | – |
| Q235B | +20 | 27 | |
| Q235C | 0 | ||
| Q235D | -20 | ||
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