ASTM A453 Grade 660D is used in high temperature applications offering expansion co-efficient comparable to austenitic stainless steels. The grades of A/B/C and D are defined by the solution treatment and subsequent hardening treatment of the material as defined under ASTM A453.
Common uses of this grade are oil, gas and petrochemical and power generation applications, normally in adverse or challenging conditions at elevated temperatures.
LoneStar Fasteners Europe can manufacture product in various forms to the standard of A453, including its supplementary requirements. A453 Grade 660D is also manufactured by LoneStar Fasteners Europe under the additional requirements of API 20F BSL 2 and 3.
Forms
| LoneStar Manufacture | ||
| Stud Bolts | ✓ | |
| Studding | ✓ | |
| Hexagon Headed Bolting | ✓ | |
| Socket Headed Bolting | ✓ | |
| Double Ended and Waisted Studs | ✓ | |
| Associated OEM Parts | ✓ | |
| Nuts | ✓ |
Sizes and Threads
| LoneStar Manufacture | ||
| Metric Coarse | ✓ | |
| Metric Fine | ✓ | |
| Imperial UNC | ✓ | |
| Imperial 8UN | ✓ | |
| Imperial UNF | ✓ | |
| ACME | ✓ | |
| Metric sizes available | Up t0 M100 | |
| Imperial sizes available | Up to 4.00″ |
Chemical Composition
| Carbon | 0.08 | % Max |
| Manganese | 2.00 | % Max |
| Phosphorus | 0.040 | % Max |
| Sulphur | 0.030 | % Max |
| Silicon | 1 | % Max |
| Chromium | 13.5-16.0 | % |
| Nickel | 24.0-27.0 | % |
| Molybdenum | 1.00-1.50 | % |
| Copper | – | … |
| Niobium | – | … |
| Titanium | 1.90-2.35 | % |
| Vanadium | 0.10-0.50 | % |
| Aluminium | 0.35 | % Max |
| Boron | 0.001-0.010 | % |
Mechanical Properties
| Up to 2 ½” Inc. (63.5mm) | Over 2 ½” (63.5mm) | |
| Tensile Strength Min, Ksi (MPa) | 130 (895) | 120 (825) |
| Yield Strength min, 0.2% offset Ksi (MPa) | 105 (725) | 95 (655) |
| Elongation min% | 15 | 15 |
| Reduction of Area min% | 18 | 18 |
| Hardness | 248-321 HB | 248-321 HB |
| Hardness | 24-35 HRC | 24-35 HRC |
Similar or Equivalent Standards
| ASTM B638 |
| EN 10269 1.4980 |