ASTM A449 Grades
A449 Types
TYPE 1 - Plain carbon steel, carbon boron steel, alloy steel, or alloy boron steel.
TYPE 2 - Withdrawn 2003.
TYPE 3 - Weathering steel.
| A449 Mechanical Properties | ||||
|---|---|---|---|---|
| Size | Tensile, ksi | Yield, ksi | Elong. %, min | RA %, min |
| 1/4 - 1 | 120 min | 92 min | 14 | 35 |
| 1-1/8" – 1-1/2" | 105 min | 81 min | 14 | 35 |
| 15/8 - 3 | 90 min | 58 min | 14 | 35 |
| A449 Chemical Properties | ||||
|---|---|---|---|---|
| Type 1 Bolts | ||||
| Element | Carbon Steel | Carbon Boron Steel | Alloy Steel | Alloy Boron Steel |
| Carbon | 0.30 - 0.52% | 0.30 - 0.52% | 0.30 - 0.52% | 0.30 - 0.52% |
| Manganese, min | 0.60% | 0.60% | 0.60% | 0.60% |
| Phosphorus, max | 0.04% | 0.04% | 0.04% | 0.04% |
| Sulfur, max | 0.05% | 0.05% | 0.04% | 0.04% |
| Silicon | 0.15 - 0.30% | 0.10 - 0.30% | 0.15 - 0.35% | 0.15 - 0.35% |
| Boron | - | 0.0005 - 0.003% | - | 0.0005 - 0.003% |
| Alloying Elements | - | - | * | * |
* Steel, as defined by the American Iron and Steel Institute, shall be considered to be alloy when the maximum range given for the content of alloying elements exceeds one of more of the following limits: Manganese, 1.65%, silicon, 0.60%, copper, 0.60%, or in which a definite range or a minimum quantity of any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels: aluminum, chromium up to 3.99%, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium or any other alloying elements added to obtain a desired alloying effect.
| Type 3 Bolts, Class * | ||||||
|---|---|---|---|---|---|---|
| Element | A | B | C | D | E | F |
| Carbon | 0.33 - 0.40% | 0.38 - 0.48% | 0.15 - 0.25% | 0.15 - 0.25% | 0.20 - 0.25% | 0.20 - 0.25% |
| Manganese | 0.90 - 1.20% | 0.70 - 0.90% | 0.80 - 1.35% | 0.40 - 1.20% | 0.60 - 1.00% | 0.90 - 1.20% |
| Phosphorus | 0.035% max | 0.06 - 0.12% | 0.035% max | 0.035% max | 0.04% | 0.04% |
| Sulfur, max | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% |
| Silicon | 0.15 - 0.35% | 0.30 - 0.50% | 0.15 - 0.35% | 0.25 - 0.50% | 0.15 - 0.35% | 0.15 - 0.35% |
| Copper | 0.25 - 0.45% | 0.20 - 0.40% | 0.20 - 0.50% | 0.30 - 0.50% | 0.30 - 0.60% | 0.20 - 0.40% |
| Nickel | 0.25 - 0.45% | 0.50 - 0.80% | 0.25 - 0.50% | 0.50 - 0.80% | 0.30 - 0.60% | 0.20 - 0.40% |
| Chromium | 0.45 - 0.65% | 0.50 - 0.75% | 0.30 - 0.50% | 0.50 - 1.00% | 0.60 - 0.90% | 0.45 - 0.65% |
| Vanadium | - | - | 0.020% min | - | - | - |
| Molybdenum | - | 0.06% max | - | 0.10% max | - | - |
| Titanium | - | - | - | 0.05% max | - | - |
* Selection of a class shall be at the option of the manufacturer.
All information derived from globally recognized specifications, subject to change, user discretion is advised.
