Introductio ad ASTM A106:
1. ASTM A106 pro materia Americana norma, inter quas A, B, C in summa tres gradus sunt.
| Norma Americana | Similes Sinicae | robur tensile |
| A | Viginti numeri | 330MPa |
| B | Q235 | 415MPa, |
| C | Q345 | 485MPa |
- Analysis chemica
| ≤C | Mn | ≤P | ≤S | Si | ≤Cr | ≤Cu | Mo | Ni | V | |
| A | 0.25 | 0.27-0.93 | 0.035 | 0.035 | 0.1 | 0.4 | 0.4 | 0.15 | 0.4 | 0.08 |
| B | 0.30 | 0.29-1.06 | 0.035 | 0.035 | 0.1 | 0.4 | 0.4 | 0.15 | 0.4 | 0.08 |
| C | 0.35 | 0.29-1.06 | 0.035 | 0.035 | 0.1 | 0.4 | 0.4 | 0.15 | 0.4 | 0.08 |
Supra gradus distinguitur per C et Mn, deinde cum diversa vi tensile venit.
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Tempus publicationis: XII Martii, MMXVIII