ASTM A453/A453M Grade 660 Class A Bolts, Stud Bolts, Nuts & Washers

ASTM A453/A453M Grade 660 Class A 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 600 Class A. We produce these Grade 660 Class A 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 Gr 660 as per drawing. We stock premium and surplus bar stock in Grade 660 (UNS S66286 ; Alloy A286) for quick manufacturing and shorter delivery periods. These ASTM A453 Grade 660 Class A Bolts are supplied with EN 10204 Type 3.1 MTC. We offer Rupture Test Facility for sufficient quantity order.

ASTM A453 Grade 660 Class A Chemical Composition (UNS S66286)

Element
Content %
Grade 660
UNS S66286
Carbon 0.08 max
Manganese 2.00 max
Phosphorus 0.04 max
Sulfur 0.03 max
Silicon 1.00 max
Nickel 24.00 - 27.00
Chromium 13.50 - 16.00
Molybdenum 1.00 - 1.50
Tungsten ---
Titanium 1.90 - 2.35
Columbium* ---
Aluminum 0.35 max
Vanadium 0.10 - 0.50
Boron 0.001 - 0.010
Copper ---

* Or Columbium plus Tantalum

ASTM A453 Grade 660 Class A 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 660 A 130 895 85 585 15 18 248-341 24 HRC 37 HRC

ASTM A453 Grade 660 Class A Heat Treatment Requirements

Grade Class Solution Treatment Hardening Treatment
Grade 660 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

ASTM A453 Grade 660 Class A Stress Rupture Requirements

Grade Class Test Temperature Stress, Min Time to Rupture, min, hA Elongation, min, %
°F °C Ksi Mpa
Grade 660 A 1200 650 56 385 100 5

The combination bar specimen shall be tested continuously at the temperature and at the minimum stress specified or at a greater stress and shall rupture in a time not less than than specified.

ASTM A453 Grade 660 Class A Marking Requirements

Grade Class A
Grade 660 BPF 660A