Grade 660 Class D

ASTM A453/A453M Grade 660 Class D 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 D. We produce these Grade 660 Class D 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 D Bolts are supplied with EN 10204 Type 3.1 MTC. We offer Rupture Test Facility for sufficient quantity order.

ASTM A453 Grade 660 Class D 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
Titanium	1.90 - 2.35
Aluminum	0.35 max
Vanadium	0.10 - 0.50
Boron	0.001 - 0.010

ASTM A453 Grade 660 Class D 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	D	130	895	105	725	15	18	248-341	24 HRC	35 HRC

ASTM A453 Grade 660 Class D Heat Treatment Requirements

Grade	Class	Solution Treatment	Hardening Treatment
Grade 660	D	1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and liquid quench	1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool, If required to achieve properties, second age: 1200 +/- 25°F [650 +/- 14°C], air cool

ASTM A453 Grade 660 Class D Stress Rupture Requirements

ASTM A453/A453M does not state any stress rupture test requirement for Grade 660 Class D Boltings.

ASTM A453 Grade 660 Class D Marking Requirements

Grade	Class D
Grade 660	BPF 660D NR