A449 is very similar to A325 in checmistry and is used for standard bolts, high tensile bolts and high tensile fasteners,
It's strength is in the middle of low and high and is manufacvtured from carbon steel or alloy steel raw material which can suffice its requirements as per A449.
Below we have mentioned the grades that fall under A449.
A449 Grades
Type 1 |
Plain Carbon Steel, Carbon Boron Steel, or alloy Boron steel |
Type 2 |
Withdrawn 2003 |
Type 3 |
Weathering Steel |
A449 Mechanical Requirements
Sizes |
Tensile ksi, min |
Yield ksi, min |
Elong %, min |
RA % min |
1/4 to 1 |
120 |
92 |
14 |
35 |
1-1/8 to 1-1/2 |
105 |
81 |
14 |
35 |
1-5/8 to 3 |
90 |
58 |
14 |
35 |
A449 Chemical Properties for 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 |
0.60 min |
0.60 min |
0.60 min |
0.60 min |
Phosphorus, max |
0.040 max |
0.040 max |
0.035 max |
0.035 max |
Sulfur, max |
0.050 max |
0.050 max |
0.040 max |
0.040 max |
Silicon |
0.15 – 0.30% |
0.10 - 0.30% |
0.15 – 0.35% |
0.15 – 0.35% |
Boron |
- |
|
|
|
Alloying Elements |
- |
0.06 max |
0.10 min |
0.10 min |
A449 Chemical Properties for Type 3 Bolts
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, max |
0.035 max |
0.06 - 0.12% |
0.035 max |
0.035 max |
0.035 max |
0.035 max |
Sulfur, max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
Silicon |
0.15 – 0.30% |
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% |
0.20 - 0.60% |
0.20 - 0.60% |
Nickel |
0.25 - 0.45% |
0.50 - 0.80% |
0.25 - 0.50% |
0.50 - 0.80% |
0.20 min |
0.20 min |
Chromium |
0.45 - 0.65% |
0.50 - 0.80% |
0.30 - 0.50% |
0.50 - 1.00% |
0.20 min |
0.20 min |
Vanadium |
- |
|
0.20 min |
- |
- |
- |
Molybdenum |
- |
0.06 max |
|
0.10% max |
|
|
Titanium |
- |
|
|
0.05% max |
|
|
A449 Compatible Nuts & Washers
Nuts |
Washers |
Plain |
Galvanized |
1/4 to 1-1/2 |
1-5/8 to 3 |
1/4 to 3 |
A563B Hex |
A563A Heavy Hex |
A563DH Heavy Hex |
F436 |