ASTM A285 steel is a kind of common carbon steel, whose tensile strength is low or mid-low. For ASTM A285 steel specification, there are three grades or levels: A285 Grade A, A285 Grade B, A285 Grade C.
ASTM A285 steel covers plate tensile strength range from 310-515Mpa. ASTM A285 steel plate is usually delivered as-rolled condition. ASTM A285 steel plate is made by killed, semi-killed, capped or rimmed steel practices according to the end users’ requirement.
ASTM A285 steel chemical composition:
| Element | Composition % | Composition % | Composition % |
| Grade A | Grade B | Grade C | |
| Carbon, max (a) | 0.17 | 0.22 | 0.28 |
| Manganese, max | |||
| Heat analysis | 0.9 | 0.9 | 0.9 |
| Product analysis | 0.98 | 0.98 | 0.98 |
| Phosphorus, max (a) | 0.035 | 0.035 | 0.035 |
| Sulfur, max (a) | 0.04 | 0.04 | 0.04 |
(a)Applies to both heat and product analysis
ASTM A285 steel mechanical property:
| ASTM A285 | Grade A | Grade B | Grade C |
| ksi(MPa) | ksi (MPa) | ksi (MPa) | |
| Tensile strength | 45-65 (310-450) | 50-65 (345-450) | 55-75 (380-515) |
| Yield strength, min (A) | 24 (165) | 27 (185) | 30 (205) |
| Elongation in 8 in. or (200 mm), min, % (B) | 27 | 25 | 23 |
| Elongation in 2 in. or (50 mm), min, % | 30 | 28 | 27 |
(A)Determined by either the 0.2% offset method or the 0.5% extension-under-load method.
(B)See Specifications A 20/A 20 M
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