Strength Requirements by Grade
| Strength Requirements by Grade | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Grade Marking | Specification | Material and Treatment | Nominal Size (In.) |
Mechanical Properties | Hardness Rockwell | |||||
| Proof Load Min (ksi) |
Yield Strength Min (ksi) |
Tensile Strength Min (ksi) |
Elong, min, % | RA, min, % | Min | Max | ||||
 |
SAE J429 Grade 1 |
Low or Medium Carbon Steel | 1/4" to 1-1/2" | 33 | 36 | 60 | 18 | 35 | B70 | B100 |
 |
A307 Grade A |
Low or Medium Carbon Steel | 1/4" to 4" | - | - | 60 | 18 | - | B69 | B100 |
 |
A307 Grade B |
Low or Medium Carbon Steel | 1/4" to 4" | - | - | 60 min 100 max |
18 | - | B69 | B95 |
 |
A307 Grade C |
Low or Medium Carbon Steel | 1/4" to 4" | - | 36 | 58 min 80 max |
23 | - | - | - |
 |
F1554 Grade 36 |
Low or Medium Carbon Steel | 1/2" to 4" | - | 36 | 58 min 80 max |
23 | 40 | - | - |
 |
F1554 Grade 55 |
Low or Medium Carbon Steel | 1/2" to 2" | - | 36 | 58 min 80 max |
21 | 30 | - | - |
| 2-1/4" to 21/2" | 21 | 30 | ||||||||
| 2-3/4" to 3" | 21 | 30 | ||||||||
| 3-1/4" to 4" | 21 | 30 | ||||||||
|
SAE J429 Grade 2 |
Low or Medium Carbon Steel | 1/4" to 3/4" | 55 | 57 | 74 | 18 | 35 | B80 | B100 |
| 7/8" to 11/2" | 33 | 36 | 60 | 18 | B70 | B100 | ||||
 |
A193/A320 Grade B8 Class 1 |
AISI SS304 Stainless | No Restrictions | - | 30 | 75 | 30 | 50 | - | B96 |
 |
A193/A320 Grade B8 Class 2 |
AISI SS304 Stainless | Up to 3/4” | - | 100 | 125 | 12 | 35 | - | C35 |
| 7/8” to 1” | 80 | 115 | 15 | 35 | ||||||
| 1-1/8” to 1-1/4” | 65 | 105 | 20 | 35 | ||||||
| 1-3/8” to 1-1/2” | 50 | 100 | 28 | 45 | ||||||
 |
A193/A320 Grade B8M |
AISI SS316 Stainless | No Restrictions | - | 30 | 75 | 30 | 50 | - | B96 |
 |
A193/A320 Grade B8 Class 2 |
AISI SS304 Stainless | Up to 3/4” | - | 95 | 110 | 15 | 45 | - | C35 |
| 7/8” to 1” | 80 | 100 | 20 | 45 | ||||||
| 1-1/8” to 1-1/4” | 65 | 95 | 25 | 45 | ||||||
| 1-3/8” to 1-1/2” | 50 | 90 | 30 | 45 | ||||||
 |
F3125 Grade A325 Type 1 |
Medium Carbon Steel, Q & T | 1/2" to 1-1/2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
 |
F3125 Grade A325 Type 3 |
Atmospheric Corrosion Resistant Steel, Q & T | 1/2" to 1-1/2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
 |
SAE J429 Grade 5 |
Medium Carbon Steel, Q & T | 1/4" to 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 1-1/8" to 11/2" | 74 | 81 | 105 | C19 | C30 | |||||
 |
A449 Type 1 |
Medium Carbon Steel, Q & T | 1/4" to 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 1-1/8" to 1-1/2" | 74 | 81 | 105 | C19 | C30 | |||||
| 1-5/8" to 3" | 55 | 58 | 90 | B91 | B100 | |||||
 |
A449 Type 3 |
Weathering Steel, Q & T | 1/4" to 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
| 11/8" to 1-1/2" | 74 | 81 | 105 | C19 | C30 | |||||
| 1-5/8" to 3" | 55 | 58 | 90 | B91 | B100 | |||||
 |
A193 Grade B7 |
Medium Carbon Alloy Steel, Q & T | 1/4" to 2-1/2" | - | 105 | 125 | 16 | 50 | - | C35 |
| 25/8" to 4" | 95 | 115 | 16 | 50 | C35 | |||||
| 41/8" to 7" | 75 | 100 | 16 | 50 | C35 | |||||
 |
A354 Grade BC |
Medium Carbon Alloy Steel, Q & T | 1/4" to 2-1/2" | 105 | 109 | 125 | 16 | 50 | C26 | C36 |
| Over 2-1/2" | 95 | 99 | 115 | 16 | 45 | C22 | C33 | |||
 |
F1554 Grade 105 |
Medium Carbon Alloy Steel, Q & T | 1/2" to 3" | - | 105 | 125min 150max |
15 | 45 | - | - |
 |
A320 Grade L7 |
AISI 4140, 4142, or 4145 | 1/4" to 2-1/2" | - | 105 | 125 | 16 | 50 | - | - |
 |
A320 Grade L43 |
AISI 4340 | 1/4" to 4" | - | 105 | 125 | 16 | 50 | - | - |
 |
F3125 Grade A490 Type 1 |
Medium Carbon Alloy Steel, Q & T | 1/2" to 1-1/2" | 120 | 130 | 150 min 173 max |
14 | 40 | C33 | C38 |
 |
F3125 Grade A490 Type 3 |
Atmospheric Corrosion Resistant Steel, Q & T | 1/2" to 1-1/2" | 120 | 130 | 150 min 173 max |
14 | 40 | C33 | C38 |
 |
SAE J429 Grade 8 |
Medium Carbon Alloy Steel, Q & T | 1/4" to 1-1/2" | 120 | 130 | 150 | 12 | 35 | C33 | C39 |
 |
A354 Grade BD |
Medium Carbon Alloy Steel, Q & T | All Sizes | - | 130 | 150-173 | 14 | 40 | C33 | C38 |
All information derived from globally recognized specifications, subject to change, user discretion is advised.
