ASTM A453 Grade 660 Stud bolt
ASTM A453 Grade 660 is a high-temperature bolting material with properties suitable for service in high-temperature environments. Specifically, Grade 660 refers to a precipitation-hardening stainless steel alloy that is commonly known as “A286” or “Alloy 660.”
ASTM A453 Grade 660 stud bolts are specific types of fasteners made from the precipitation-hardening stainless steel alloy known as Alloy 660 or A286, which conforms to the
ASTM A453 Grade 660 specification.
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Standard Specification for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
This specification covers standards for Grade 660 (Class A, B, C, and D) , Grade 651 (Class A and B), Grade 662 (Class A and B), and Grade 665 (Class A and B) of bolting materials for use in high-temperature service such as fasteners, for pressure vessels and valve flanges. Bolting materials in this specification covers rolled, forged, or hot-extruded bars, and also bolts, nuts, screws, washers, studs, and stud bolts.
A453 Grade 660 Material Equivalent
| AISI | UNS | BS | Wr No. | En Name | DIN EN | JIS | AMS | ASTM | other names | Additional Requirements |
|---|---|---|---|---|---|---|---|---|---|---|
| 660 | S 66286 | HR 51 | 1.4944 | X6NiCrTiMoV26-15 | 10269 | SUS 660 | 5726 | ASTM A453 GRADE 660A | incoloy a286 | NACE MR-0175 |
Chemical Composition of A453 Gr 660 Stud Bolts
| Element | Grade 660 |
|---|---|
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Phosphorus, max | 0.040 max |
| Sulfur, max | 0.030 max |
| Silicon | 1.00 max |
| Nickel | 24.0-27.0 |
| Chromium | 13.5-16.0 |
| Molybdenum | 1.00-1.50 |
| Tungsten | … |
| Titanium | 1.9-2.35 |
| Columbium * | … |
| Aluminum | 0.35 max |
| Vanadium | 0.10-0.50 |
| Boron | 0.001-0.010 |
| Copper | – |
ASTM A453 Gr 660 Stus bolt Strength Chart
| Grade | Class | Tensile Strength | Yield Strength | Elongation in 4D, min, % |
Reduction of Area, min, % |
Brinell Hardness Number |
Approximate Rockwell Hardness, B & C |
|||
|---|---|---|---|---|---|---|---|---|---|---|
| Ksi | Mpa | Ksi | Mpa | min | max | |||||
| Grade 660 | A, B and C | 130 | 895 | 85 | 585 | 15 | 18 | 248-341 | 24 HRC | 37 HRC |
| Grade 660 | D | 130 | 895 | 105 | 725 | 15 | 18 | 248-341 | 24 HRC | 35 HRC |
| Grade | Class A | Class B | Class C | Class D |
|---|---|---|---|---|
| Grade 660 Bolts | 660A | 660B | 660C | 660D NR |
Our ASTM A453 Grade 660 Cl D Stud bolts and nuts can meet impact test requirements of 70 joules minimum at – 196 Degrees Centigrade and comply with NACE MR 0175 requirement.