ASTM A453 Grade 668
ASTM A453/A453M Grade 668 Class A/B Bolts, Stud Bolts, Nuts & Washers
- Introduction
- Tensile Class
- Chemical Composition
- Mechanical Properties
- Heat Treatment
- Stress Rupture Requirement
- Marking Requirement
ASTM A453/A453M Grade 668 Class A & Class B Stainless Steel Bolting for High Temperature Applications
We offer precisely made Stud Bolts, Hex Bolts, Heavy Hex Bolts, Socket Head Cap Screws, Threaded Rods, Nuts & Washers as per ASTM A453 Grade 668 Class A and B. We produce these Grade 668 Bolts from 3/8" to 4" in imperial and upto M100 in metric sizes. Larger size bolts can be made to order as per request. We also undertake custom made boltings in A453 as per drawing. We stock premium and surplus bar stock in Grade 668 (UNS S66285) for quick manufacturing and shorter delivery periods. These ASTM A453 Grade 668 Bolts are supplied with EN 10204 Type 3.1 MTC. We offer Rupture Test Facility for sufficient quantity order.
ASTM A453 Grade 668 Tensile Class
| Grade 668 | Class A | Class B |
ASTM A453 Grade 668 Chemical Composition
| Element | |
|---|---|
| Content % | |
| Grade 668 UNS S66285 |
|
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Phosphorus | 0.04 max |
| Sulfur | 0.03 max |
| Silicon | 1.00 max |
| Nickel | 17.50 - 21.50 |
| Chromium | 13.50 - 16.00 |
| Molybdenum | 1.50 max |
| Tungsten | --- |
| Titanium | 2.20 - 2.80 |
| Columbium* | --- |
| Aluminum | 0.50 max |
| Vanadium | 0.50 max |
| Boron | 0.001 - 0.010 |
| Copper | --- |
* Or Columbium plus Tantalum
ASTM A453 Grade 668 Class A/B Mechanical Properties
| 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 668 | A and B | 130 | 895 | 80 | 858 | 15 | 18 | 248-321 | 24 HRC | 37 HRC |
ASTM A453 Grade 668 Class A/B Heat Treatment Requirements
| Grade | Class | Solution Treatment | Hardening Treatment |
|---|---|---|---|
| Grade 668 | A | 1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench | 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool |
| Grade 668 | B | 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and liquid quench | 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool |
ASTM A453 Grade 668 Class A/B Stress Rupture Requirements
This Grade does not requirement rupture test.
ASTM A453 Grade 668 Class A/B Marking Requirements
| Grade | Class A | Class B | Class C | Class D |
|---|---|---|---|---|
| Grade 668 | FB 668A NR | FB 668B NR |
