ASTM A453/A453M Grade 668 Class A/B Bolts, Stud Bolts, Nuts & Washers

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