Hem Industries
Hem Industries
ASTM A 453 Grade 660 A Details & Specifications
- ASTM A453 Grade 660 covers four grades of bolting materials with ten classes of yield strength ranging from 50 to120 ksi [345 to 827 MPa] for use in high-temperature service such as fasteners for pressure vessel and valve flanges.
- ASTM A 453 Grade 660 Fasteners requires special processing and is not intended for general purpose applications.
- The term bolting material as used in this specification, covers rolled, forged, or hot-extruded bars; bolts, nuts, screws, washers, studs, and stud bolts. Headed bolts and rolled threads may be supplied.
- ASTM A453 Grade 660 is classified into 4 property class namely A, B, C & D, each designated with different tensile and stress rupture properties.
ASTM A 453 Grade 660-A
| Chemical Composition | C | Mn | Si | Cr | Ni | Mo | P | S | Fe | Ti | Al | V | B |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 13.5 | 24 | 1 | Balance | 1.90 | 0.10 | 0.001 | ||||||
| Max | 0.08 | 2.00 | 1.00 | 16 | 27 | 1.50 | 0.04 | 0.03 | Balance | 2.35 | 0.35 | 0.50 | 0.010 |
| Mechanical Properties | Tensile Strength | Yield Strength | Elongation | Reduction | Hardness | Rockwell Hardness | Range | ||
|---|---|---|---|---|---|---|---|---|---|
| KSI | (MPa) | KSI | (MPa) | Min % | Min % | Brinell | B and C | ||
| 660 Class A/B/C | 130 | (895) | 85 | (585) | 15 | 18 | 248-341 | 24 HRC | Min |
| 37 HRC | Max | ||||||||
| 660 Class D | 130 | (895) | 105 | (725) | 15 | 18 | 248-321 | 24 HRC | Min |
| 35 HRC | Max | ||||||||
| Stress Rupture Requirement | Test Temperature | Stress Min | Time to Rupture | Elongation | ||
|---|---|---|---|---|---|---|
| 660 Grade A / B / C | F | ( C ) | KSI | (Mpa) | Min Hours | Min % |
| 1200 | (650) | 56 | (385) | 100 | 5 |
Characteristics
ASTM A 453 Grade 660 Class A/B/C/D
UNS 66286
ASTM A 453/453M
Fasteners Manufactured by Hem Industries
- ASTM A 453 Grade 660 Threaded Bar
- ASTM A 453 Grade 660 Stud Bolt
- ASTM A 453 Grade 660 Double End Stud Bolt
- ASTM A 453 Grade 660 Head Hex Bolt
- ASTM A 453 Grade 660 Head Hex Screws
- ASTM A 453 Grade 660 Head Hex Nut and Heavy Hex Nut
- ASTM A 453 Grade 660 Foundation Bolt
- ASTM A 453 Grade 660 Plain Washer
- ASTM A 453 Grade 660 Spring Washer
- ASTM A 453 Grade 660 Bar
- ASTM A 453 Grade 660 Round Bar
Sizes Manufactured by Hem Industries
Imperial Series: 5/16 Inch upon 4 Inch Diameter
Metric Series: M6 upto M100
Dimension Standards
IS: Indian Standard
ASTM: American Standard
DIN: German Standard
ISO: European Standard
JIS: Japanese Standard
Raw Material Origin for ASTM A 453 Grade 660 will be from USA Mill, European Mill, Japanese Mill and Korean Mill only.