ASTM A453/A453M Grade 665 Class B Bolts, Stud Bolts, Nuts & Washers

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

ASTM A453/A453M Grade 665 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 665 Class B. We produce these Grade 665 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 665 as per drawing. We stock premium and surplus bar stock in Grade 665 (UNS S66545) for quick manufacturing and shorter delivery periods. These ASTM A453 Grade 665 Class B Bolts are supplied with EN 10204 Type 3.1 MTC. We offer Rupture Test Facility for sufficient quantity order.

ASTM A453 Grade 665 Class B Chemical Composition

Element
	Content %
	Grade 665 UNS S66545
Carbon	0.08 max
Manganese	1.25 - 2.00
Phosphorus	0.04 max
Sulfur	0.03 max
Silicon	0.10 - 0.80
Nickel	24.00 - 28.00
Chromium	12.00 - 15.00
Molybdenum	1.25 - 2.25
Tungsten	---
Titanium	2.70 - 3.30
Columbium*	---
Aluminum	0.25 max
Vanadium	---
Boron	0.01 - 0.07
Copper	0.25 max

* Or Columbium plus Tantalum

ASTM A453 Grade 665 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
		Ksi	Mpa	Ksi	Mpa				min	max
Grade 665	B	155	1070	120	830	12	15	311-388	32 HRC	41 HRC

ASTM A453 Grade 665 Class B Heat Treatment Requirement

Grade	Class	Solution Treatment	Hardening Treatment
Grade 665	B	2000 +/- 25° F [1095 +/- 14°C], hold 3 hr and liquid quench	1350 to 1400° F [730 to 760°C], hold 20 hr, furnace cool to 1200 +/- 25°F [650 +/- 14°C], hold 20hr, air cool

ASTM A453 Grade 665 Class B Stress Rupture Requirement

Grade	Class	Test Temperature		Stress, Min		Time to Rupture, min, hA	Elongation, min, %
		°F	°C	Ksi	Mpa
Grade 665	B	1200	650	70	485	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 665 Class B Marking Requirement

Grade	Class B
Grade 665	FB 665B