Hastelloy C276 flanges are a unique type of equipment, distinguished by their remarkable material composition and superior properties. Composed of a super alloy known as Hastelloy C276, these flanges exhibit unusual durability and resistance in challenging conditions.

Hastelloy C276 is an alloy that stands out because of its distinctive blend of elements: nickel, molybdenum, and chromium primarily, with traces of iron, tungsten, cobalt, and other elements. This blend gives the Hastelloy C276 remarkable characteristics, extending these qualities to the flanges crafted from it.

Specifications Of Hastelloy C276 Flanges

Standards	ANSI/ASME B16.5, EN Flanges,  BS 10,  B16.47 Series A & B,  EN-1092,  ASME Flanges,  BS Flanges,  B16.48,  DIN,  DIN Flanges,  GOST Flanges,  ANSI Flanges,  BS4504.
Size	1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000
Pressure Rating	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Production technique	Forged, Heat treated and machined
Connect Type/ Flange Face Type	Ring Type Joint (RTJ),  Small Tongue, Raised Face (RF),  Lap-Joint Face (LJF),  Small Male-Female (SMF),  Flat Face (FF),  Large Tongue & Groove,  Large Male-Female (LMF).
Application	Gas,  Power,  Chemical,  Metallurgy, Petroleum,  Shipbuilding,  Construction etc.
Equipment	Pushing Machine, Press machine, Bending machine, Sand-blasting machine, electric bevelling machine etc

ASTM B564 Hastelloy C276 Chemical Composition

Hastelloy C276 flange is a nickel-molybdenum-chromium alloy. The presence of molybdenum gives the alloy excellent resistance to reducing acid corrosion, while the chromium element helps to improve the alloy’s oxidation resistance and corrosion resistance, especially in oxidizing environments.

CHEMICAL	LIMITS	Ni	Fe	Mn	C	Si	S	Cr	Mo	P	W	Co	V
Hastelloy C276	MIN	Balance	4					14.5	15		3
	MAX		7	1	0.01	0.08	0.03	16.5	17	0.04	4.5	2.5	0.35

ASTM B564 Hastelloy C276 Mechanical Properties

Hastelloy C276 flanges has good strength and toughness. Its mechanical properties such as yield strength and tensile strength can meet the requirements of various harsh engineering conditions.

Grade	Density	Melting Point	Yield Strength (0.2%Offset)	Tensile Strength	Elongation
C276	8.89 g/cm3	1370 °C (2500 °F)	Psi – 52,000 , MPa – 355	Psi – 1,15,000 , MPa – 790	40 %

Equivalent Grades of Hastelloy C276 Flanges

STANDARD	EN	UNS	WERKSTOFF NR.	JIS	GOST	OR
Hastelloy C276	NiMo16Cr15W	N10276	2.4819	NW 0276	ХН65МВУ	ЭП760

Hastelloy C276 Flanges Dimension

Nominal Pipe Size, NPS	O	[Notes (2)-(4)]	Lap Joint, tf	X	[Note (5)]	Length Through Hub			[Note (6)]	Bore		[Note (7)]	r	D
						Threaded/ Slip-on/ Socket Welding,              Y	Lapped,           Y	Welding Neck, Y		Minimum Slip-on/ Socket      Welding,                 B	Minimum Lapped, B
1/2	90	9.6	11.2	30	21.3	14	16	46	16	22.2	22.9	15.8	3	10
3/4	100	11.2	12.7	38	26.7	14	16	51	16	27.7	28.2	20.9	3	11
1	110	12.7	14.3	49	33.4	16	17	54	17	34.5	34.9	26.6	3	13
1 1/4	115	14.3	15.9	59	42.2	19	21	56	21	43.2	43.7	35.1	5	14
1 1/2	125	15.9	17.5	65	48.3	21	22	60	22	49.5	50.0	40.9	6	16
2	150	17.5	19.1	78	60.3	24	25	62	25	61.9	62.5	52.5	8	17
2 1/2	180	20.7	22.3	90	73.0	27	29	68	29	74.6	75.4	62.7	8	19
3	190	22.3	23.9	108	88.9	29	30	68	30	90.7	91.4	77.9	10	21
3 1/2	215	22.3	23.9	122	101.6	30	32	70	32	103.4	104.1	90.1	10
4	230	22.3	23.9	135	114.3	32	33	75	33	116.1	116.8	102.3	11
5	255	22.3	23.9	164	141.3	35	36	87	36	143.8	144.4	128.2	11
6	280	23.9	25.4	192	168.3	38	40	87	40	170.7	171.4	154.1	13
8	345	27.0	28.6	246	219.1	43	44	100	44	221.5	222.2	202.7	13
10	405	28.6	30.2	305	273.0	48	49	100	49	276.2	277.4	254.6	13
12	485	30.2	31.8	365	323.8	54	56	113	56	327.0	328.2	304.8	13
14	535	33.4	35.0	400	355.6	56	57	125	57	359.2	360.2	Note(8)	13
16	595	35.0	36.6	457	406.4	62	64	125	64	410.5	411.2	Note(8)	13
18	635	38.1	39.7	505	457.0	67	68	138	68	461.8	462.3	Note(8)	13
20	700	41.3	42.9	559	508.0	71	73	143	73	513.1	514.4	Note(8)	13
24	815	46.1	47.7	663	610.0	81	83	151	83	616.0	616.0	Note(8)	13

Differences between Hastelloy C22 and C276 Flange

Differences in Chemical Composition

Hastelloy C276 flanges has a chromium content of 14.5 – 16.5%. Compared with Hastelloy C22 flange, the chromium content is slightly lower. The molybdenum content is 15 – 17%. The molybdenum content is slightly higher than that of C22, which may make C276 have better corrosion resistance in some reducing corrosion environments. The tungsten content is 3 – 4.5%. Its tungsten content is also slightly higher than that of C22, which has a certain impact on high temperature performance and corrosion resistance.

Different Corrosion Resistance

In a strong oxidizing acid environment, due to its higher chromium content, C22 flange can form a more stable chromium oxide protective film and show better corrosion resistance.

In some complex environments containing a mixture of oxidizing and reducing media, Hastelloy C276 flange has better comprehensive corrosion resistance.