Bolts & Nuts

We are manufacturer of Flange bolts & Nuts and supply high quality Flange bolts & Nuts in both large and small quantities worldwide and offer you the best prices in the market.

Flange Nuts

A flange nut is a nut that has a wide flange at one end that acts as an integrated, non-spinning washer.

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We are manufacturer of Flange bolts & Nuts and supply high quality

A193= This specification covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
A320= Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-Temperature Service.
A194= Standard specification for nuts in many different material types.

ASTM A453

ASTM A453 Grade 660 is a material specification for studs, bolts, nuts and other fasteners, intended for use in high temperature bolting applications.

ASTM A453 Grade 660 is classified into 4 property class namely A, B, C & D, each designated with different tensile and stress rupture properties. Grade 660 fasteners are used in bolting boilers, pressure vessels, pipeline flanges and valves, intended for high temperature service. ASTM A453 grade 660 material is chemically equivalent to ASTM B638 grade 660 stainless steel alloy, also known by alloy A286 and UNS S66286, heat treated to achieve properties defined in ASTM A453 specification.

Find more information on chemical composition, mechanical properties, tensile class, heat treatment definition, available products, bar stock sizes, applicable dimension standards, etc.

Grade	Class	Tensile Strength, min		Yield Strength, min		Elongation %
		ksi	Mpa	ksi	Mpa
660	A, B, and C	130	895	85	585	15
	D	130	895	105	725	15
651	A	100	690	70 A	485	18
				60B	415
	B	95	655	60A	415	18
				50B	345
662	A	130	895	85	585	15
	B	125	860	80	550	15
665	A	170	1170	120	830	12
	B	155	1070	120	830	12
668	A and B	130	895	85	585	15

Material Chemical CompositionRequirements

ELEMENT	Grade 660	Grade 651	Grade 662	Grade 665	Grade 668
ELEMENT	%	%	%	%	%
Carbon	0.08 max	0.28-0.35	0.08 max	0.08 max	0.08 max
Manganese	2.00马克思	0.75-1.5	0.40-1.00	1.25-2.00	2.00马克思
Phosphorus, max	0.040 max	0.040 max	0.040 max	0.040 max	0.040 max
Sulfur, max	0.030 max	0.030 max	0.030 max	0.030 max	0.030 max
Silicon	1.00 max	0.30-0.80	0.40-1.00	0.1-0.80	1.00 max
Nickel	24.0-27.0	8.0-11.0	24.0-28.0	24.0-28.0	17.5-21.5
Chromium	13.5-16.0	18.0-21.0	12.0-15.0	12.0-15.0	13.5-16.0
Molybdenum	1.00-1.50	1.00-1.75	2.0-3.50	1.25-2.25	1.50 max
Tungsten	...	1.00-1.75	...	...	...
Titanium	1.9-2.35	0.1-0.35	1.80-2.10	2.70-3.30	2.20-2.80
Columbium *	...	0.25-0.6	...	...	...
铝	0.35 max		0.35 max	0.25 max	0.50 max
Vanadium	0.10-0.50		...	...	0.50 max
Boron	0.001 - -0.010		0.001 - -0.010	0.01-0.07	0.001 - -0.010
Copper		0.50 max	0.50 max	0.25 max	...

Mechanical Properties Requirements

Size	Class	Tensile, Mpa	Yield, Mpa	Elong. %, min	RA %, min
Grade 660	A, B , & C	895 min	585 min	15	18
	D	895 min	725 min	15	18
Grade 651	A	690 min	485 min	18	35
Grade 651	A	690 min	415 min	18	35
	B	655 min	415 min	18	35
	B	655 min	345 min	18	35
Grade 662	A	895 min	585 min	15	18
	B	860 min	550 min	15	18
Grade 665	A	1170 min	830 min	12	15
	B	1070 min	830 min	12	15
Grade 665	A & B	895 min	858 min	15	18

Heat Treatment Requirements

Grade	Class	Solutiona Treatment	Hardening Treatment
660	A	1650 +/- 25 °F [900 +/-14 °C], hold 2 h, min and liquid quench	1325 +/- 25 °F [720 +/- 14 °C] 16h, air cool
	B	1800 +/- 25 °F [980 +/-14 °C], hold 1 h, min and liquid quench	1325 +/- 25 °F [720 +/- 14 °C] 16h, air cool
	C	1800 +/- 25 °F [980 +/-14 °C], hold 1 h, min and oil quench	1425 +/- 25 °F [775 +/- 14 °C] hold 16h, air cool followed by 1200 +/- 25 °F [650 +/- 14 °C], hold 16h, air cool
	D	1650 +/- 25 °F [900 +/-14 °C], hold 2 h, min and liquid quench OR	1325 +/- 25 °F [720 +/- 14 °C] hold 16h, air cool followed by 1200 +/- 25 °F [650 +/- 14 °C], hold 16h, air cool if neccessary to achieve properties, second age : 1200 +/- 25 °F [650 +/- 14 °C] hold 16h, air cool
		1800 +/- 25 °F [980 +/-14 °C], hold 1 h, min and liquid quench
651	A		hot-cold worked at 1200 °F[650] min with 15% min reduction in cross sectional area, stress-relief anneal at 1200 °F [650 °C] min or 4h, min
651	B		hot-cold worked at 1200 °F[650] min with 15% min reduction in cross sectional area, stress-relief anneal at 1350 °F [730 °C] min or 4h, min
662	A	1800 +/- 25 °F [980 +/-14 °C], hold 1 h, min and liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20h, furnace cool to 1200 +/- 25 °F [650 +/- 14 °C], hold 20h, air cool
662	B	1950 +/- 25 °F [1065 +/-14 °C], hold 2 h, min and liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20h, furnace cool to 1200 +/- 25 °F [650 +/- 14 °C], hold 20h, air cool
665	A	1800 +/- 25 °F [980 +/-14 °C], hold 3 h, min and liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20h, furnace cool to 1200 +/- 25 °F [650 +/- 14 °C], hold 20h, air cool
665	B	2000 +/- 25 °F [1095 +/-14 °C], hold 3 h, min and liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20h, furnace cool to 1200 +/- 25 °F [650 +/- 14 °C], hold 20h, air cool
668	A	1650 +/- 25 °F [900 +/-14 °C], hold 2 h, min and liquid quench	1325 +/- 25 °F [720 +/- 14 °C] 16h, air cool
668	B	1800 +/- 25 °F [980 +/-14 °C], hold 1 h, min and liquid quench	1325 +/- 25 °F [720 +/- 14 °C] 16h, air cool

Stree Rupture Requirements

Grade	Class	Test Temperature	Stress, Min		Time to Rupture	Elongation
Grade	Class	Deg F [ Deg C ]	Ksi	Mpa	Min, h*	Min %
660	A, B & C	1200 [650]	56	385	100	5
651	A & B	1200 [650]	40	275	100	5
662	A & B	1200 [650]	55	380	100	5
665	A	1200 [650]	75	515	100	3
665	B	1200 [650]	70	485	100	5