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

Introduction
Chemical Composition
Mechanical Properties
Heat Treatment
Stress Rupture Requirement
Marking Requirement

ASTM A453/A453M Grade 660 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 600 Class B. We produce these Grade 660 Class B 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 B Bolts are supplied with EN 10204 Type 3.1 MTC. We offer Rupture Test Facility for sufficient quantity order.

ASTM A453 Grade 660 Tensile Class

Grade 660

ASTM A453 Grade 660 Class B 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 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
Grade	Class	Ksi	Mpa	Ksi	Mpa	Elongation in 4D, min, %	Reduction of Area, min, %	Brinell Hardness Number	min	max
Grade 660	B	130	895	85	585	15	18	248-341	24 HRC	37 HRC

ASTM A453 Grade 660 Class B Heat Treatment Requirements

Grade	Class	Solution Treatment	Hardening Treatment
Grade 660	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 660 Class B Stress Rupture Requirements

Grade	Class	Test Temperature		Stress, Min		Time to Rupture, min, h^A	Elongation, min, %
Grade	Class	°F	°C	Ksi	Mpa	Time to Rupture, min, h^A	Elongation, min, %
Grade 660	B	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 B Marking Requirements

Grade	Class B
Grade 660	BPF 660B