ASTM A453 Grade 660 Mechanical properties describe tensile Class A, B, C & D along with Brinell hardness, Rockwell hardness, stress rupture test requirements and impact test requirements.
| Grade | ASTM A453/A453M Grade 660 | ||||
|---|---|---|---|---|---|
| Class | A, B, and C | D (≤2 1 / 2 in. [63.5 mm]) | D (>2 1 / 2 in. [63.5 mm]) | Cold Worked | |
| Tensile Strength,min | ksi | 130 | 130 | 120 | 160 |
| MPa | 895 | 895 | 825 | 1100 | |
| Yield Strength(0.2 % Offset), min | ksi | 85 | 105 | 95 | 120 |
| MPa | 585 | 725 | 655 | 825 | |
| Elongation in 4× Diam, min, % | 15 | 15 | 15 | 12 | |
| Reduction of Area, min, % | 18 | 18 | 18 | 18 | |
| Brinell Hardness Number | 248-341 | 248-321 | 248-321 | 248-341 | |
| Approximate Rockwell Hardness,B and C | min | 24 HRC | 24 HRC | 24 HRC | 24HRC |
| max | 37 HRC | 35 HRC | 35 HRC | 37HRC | |
| Hardness as per API 20F BSL2 & BSL3* | N/A | 35 HRC | 35 HRC | N/A | |
|
|||||
| Properties | Temperatures | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50℃ | 100℃ | 150℃ | 200℃ | 250℃ | 300℃ | 350℃ | 400℃ | 450℃ | 500℃ | 550℃ | 600℃ | 650℃ | 700℃ | 750℃ | ||
| Yield point | Re (MPa) | >592 | >580 | >570 | >560 | >550 | >530 | >520 | >510 | >500 | >490 | >460 | >430 | >380 | >295 | >200 |
| Density | ρ | 8.00 kg/dm3 |
|---|---|---|
| Modulus of elasticity | E | 211 GPa |
| Coefficient of thermal expansion | α | 17.0 - 18.5 ⋅ 10-6 K-1 |
| Heat conductivity | λ20℃ | 13 W ⋅ m-1 ⋅ K-1 |
| Testing Temperature | Charpy V-Notch Impact Energy | ||
|---|---|---|---|
| ° F | ° C | Ft-lbs | Joules |
| -320 | -196 | 57 | 77 |
| -100 | -73 | 68 | 92 |
| 80 | 27 | 64 | 87 |
| 410 | 210 | 60 | 81 |
| 810 | 432 | 52 | 70 |
| 1010 | 543 | 46 | 62 |
| 1113 | 600 | 44 | 60 |
| 1250 | 677 | 41 | 56 |
| 1450 | 788 | 52 | 71 |
| Grade | Class | Test Temperature, °F [°C] | Stress, min | Time to Rupture, min, hA | Elongation, min, % | |
|---|---|---|---|---|---|---|
| ksi | MPa | |||||
| ASTM A453/A453M Grade 660 | A, B, C | 1200 [650] | 56 | 385 | 100 | 5 |
| D | No Stress Rupture Required to be marked NR | |||||
|
||||||
| Specimen Dimensions | Specimen Type | Mid-length Gage Dia D and Notch-Root Dia F | Gage Length, G | Shoulder Diameter, H | Notch-Root Radius |
|---|---|---|---|---|---|
| Inches | 1 | 0.125 | 0.5 | 0.177 | 0.005 |
| 2 | 0.160 | 0.65 | 0.226 | 0.005 | |
| 3 | 0.178 | 0.75 | 0.250 | 0.005 | |
| 4 | 0.252 | 1.0 | 0.375 | 0.007 | |
| 5 | 0.357 | 1.5 | 0.500 | 0.010 | |
| 6 | 0.505 | 2.0 | 0.750 | 0.015 | |
| Tolerance | ±0.001 | ±0.05 | ±0.003 | ±0.0005 | |
| Millimetres | 7 | 3.17 | 12.0 | 4.5 | 0.13 |
| 8 | 4.06 | 17.0 | 5.5 | 0.13 | |
| 9 | 4.52 | 20.0 | 6.5 | 0.13 | |
| 10 | 6.40 | 25.0 | 9.5 | 0.18 | |
| 11 | 9.07 | 40.0 | 12.0 | 0.25 | |
| 12 | 12.8 | 50.0 | 19.0 | 0.38 | |
| Tolerance | ±0.025 | ±1.3 | ±0.1 | ±0.01 |
Impact tests shall be performed in accordance with the procedures specified in ASTM A370 or ISO 148-1 using the Charpy V-notch technique.
To qualify material for a temperature rating, impact tests shall be performed at or below the lowest temperature shown in the table for that temperature range.
Three impact specimens shall be tested to qualify a heat of material. Impact properties as determined from these tests shall satisfy the applicable requirements . In no case shall an individual impact value fall below two-thirds of that required as a minimum average. No more than one of the three test results shall be below the required minimum average.
| Temperature | Minimum Average Impact Value, J (ft-lb) | ||||
|---|---|---|---|---|---|
| Transverse | Direction | Longitudinal | Direction | ||
| Wrought or Cast Qualification | Material, Weld | Alternate Method for Only | Wrought Materials | ||
| Class | Test °C (°F) | PSL 1 and PSL 2 | PSL 3 and PSL 4 | PSL 1 and PSL 2 | PSL 3 and PSL 4 |
| K | -60 (-75) | 20 (15) | 20 (15) | 27 (20) | 27 (20) |
| L | -46 (-50) | 20 (15) | 20 (15) | 27 (20) | 27 (20) |
| Specimen Dimension | Adjustment Factor | Minimum Average Impact Value | |
|---|---|---|---|
| Transverse Direction Wrought and Castings J (ft-lb) | Longitudinal Direction Wrought a J (ft-lb) | ||
| 10 mm X 10 mm (full size) | 1 (none) | 20 (15) | 27 (20) |
| 10 mm X 7.5 mm | 0.833 | 17 (13) | 23 (17) |
| 10 mm X 6.7 mm | 0.78 | 16 (12) | 21 (16) |
| 10 mm X 5.0 mm | 0.667 | 13 (10) | 18 (13) |
| 10 mm X 3.3 mm | 0.44 | 9 (7) | 12 (9) |
| 10 mm X 2.5 mm | 0.333 | 7 (5) | 9 (7) |
| Product | Pressure Rating MPa (psi) | Nominal Size ( in .) | ASTM Bolting Standard(s) and 0.2 % Offset Yield Strength |
|---|---|---|---|
| H2S-Exposed Bolting | |||
| A453 GR. 660D (≤ 4. 0" ) CRA |
|||
| 725 MPa (105 ksi) | |||
| API 6A Studs, Bolts, and Cap Screws | 13.8 (2000 ) | All sizes | ✔ |
| 20.7(3000 ) | All sizes | ✔ | |
| 34.5 (5000 ) | All sizes | ✔ | |
| 69. 0(10,000) | 1 13/16, 2 1/16, 2 9/16,3 1/16 | ✔ | |
| 4 1/16 | ✔ | ||
| 5 1/8 | ✔ | ||
| 7 1/16 | ✔ | ||
| 9, 11, 13 5/8, 18 3/4, 21 1/4 | ✔ | ||
| 103.5(15,000 ) | 14/5 | ✔ | |
| 2 1/16, 2 9/16,3 1/16, 4 1/16 | ✔ | ||
| 5 1/8 | ✔ | ||
| 7 1/16, 9, 11, 13 5/8 | ✔ | ||
| 18 3/4 | ✔ | ||
| 138.0(20,000 ) | 1 13/16, 2 1/16, 2 9/16,3 1/16, 4 1/16, 7 1/16, 9 | ✔ | |
| 11, 13 5/8 | ✔ | ||
| API 6A Nuts | All pressure ratings | All sizes | ASTM A194/A194M GR.2HM, 7M |
