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ASTM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F Forged forging Steel Round Bars Hollow Bars Rods Square rectangular Flat bars Blocks Discs Disks Plates
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We are professional ASTM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F Forged forging Steel Round Bars Hollow Bars Rods Square rectangular rectangle Blocks Discs Disks Plates Flat Hex Bars ASTM A668/A668M/A 668 Cl.C Cl.B Cl.D CL.E CL.F From china
A668 Chemical Requirements
| Element | Classes A to F and AH to FH | Classes G to N and GH to NH |
|---|---|---|
| Manganese % max | 1.35 | - |
| Phosphorous % max | 0.050 | 0.040 |
| Sulfur % max | 0.050 | 0.040 |
A668 Mechanical Requirements
| Class | Size, inches | Tensile, min ksi | Yield, min ksi | Elong, % min in 2” | RA, % min | Hardness, HBN |
|---|---|---|---|---|---|---|
| A | Up to 20 | 47 | - | - | - | 183 max |
| B | Up to 20 | 60 | 30 | 24 | 36 | 120-174 |
| C | Up to 12 | 66 | 33 | 23 | 36 | 137-183 |
| 12 to 20 | 66 | 33 | 22 | 34 | 137-183 | |
| D | Up to 8 | 75 | 37.5 | 24 | 40 | 149-207 |
| 8 to 12 | 75 | 37.5 | 22 | 35 | 149-207 | |
| 12 to 20 | 75 | 37.5 | 20 | 19 | 149-207 | |
| Over 20 | 75 | 37.5 | 19 | 30 | 149-207 | |
| E | Up to 8 | 85 | 44 | 25 | 40 | 174-217 |
| 8 to 12 | 85 | 44 | 23 | 37 | 174-217 | |
| 12 to 20 | 83 | 43 | 22 | 35 | 174-217 | |
| F | Up to 4 | 90 | 55 | 20 | 39 | 187-235 |
| 4 to 7 | 85 | 50 | 20 | 39 | 174-217 | |
| 7 to 10 | 85 | 50 | 19 | 37 | 174-217 | |
| 10 to 20 | 82 | 48 | 19 | 36 | 174-217 | |
| G | Up to 12 | 80 | 50 | 24 | 40 | 163-207 |
| 12 to 20 | 80 | 50 | 22 | 38 | 163-207 | |
| H | Up to 7 | 90 | 60 | 22 | 44 | 187-235 |
| 7 to 10 | 90 | 58 | 21 | 42 | 187-235 | |
| 10 to 20 | 90 | 58 | 18 | 40 | 187-235 | |
| J | Up to 7 | 95 | 70 | 20 | 50 | 197-255 |
| 7 to 10 | 90 | 65 | 20 | 50 | 187-235 | |
| 10 to 20 | 90 | 65 | 18 | 48 | 207-255 | |
| K | Up to 7 | 105 | 80 | 20 | 50 | 212-269 |
| 7 to 10 | 100 | 75 | 19 | 50 | 207-269 | |
| 10 to 20 | 100 | 75 | 18 | 48 | 207-269 | |
| L | Up to 4 | 125 | 105 | 16 | 50 | 255-321 |
| 4 to 7 | 115 | 95 | 16 | 45 | 235-302 | |
| 7 to 10 | 110 | 85 | 16 | 45 | 223-293 | |
| 10 to 20 | 110 | 85 | 14 | 40 | 223-293 | |
| M | Up to 4 | 145 | 120 | 15 | 45 | 293-352 |
| 4 to 7 | 140 | 115 | 14 | 40 | 285-341 | |
| 7 to 10 | 135 | 110 | 13 | 40 | 269-331 | |
| 10 to 20 | 135 | 110 | 12 | 38 | 269-341 | |
| N | Up to 4 | 170 | 140 | 13 | 40 | 331-401 |
| 4 to 7 | 165 | 135 | 12 | 35 | 331-401 | |
| 7 to 10 | 160 | 130 | 11 | 35 | 321-388 | |
| 10 to 20 | 160 | 130 | 11 | 35 | 321-402 |
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