Forged Steel Flanges Archives | Quality Manufacturer of Industrial Pipe Fittings

ASME B16.47 Series B Flanges

zhao77jie — Thu, 21 Aug 2025 02:00:00 +0000

ASME B16.47 Series B Flanges are large-diameter steel flanges specifically designed for high-pressure, high-temperature piping systems. They are part of the ASME B16.47 standard, which covers butt-weld flanges and blind flanges in sizes ranging from NPS 26 to NPS 60. ASME B16.47 is a standard established by the American Society of Mechanical Engineers (ASME) specifically for defining the dimensions and pressure ratings of large-diameter steel flanges ranging from NPS 26“ to NPS 60”. This standard succeeded two separate standards: MSS SP-44 (Series A) and API 605 ( Series B).

ASME B16.47 Series B flanges, as the successor to API 605, are renowned for their unique structural design. Compared to Series A flanges, Series B flanges are typically thinner, lighter, and use more but smaller bolts. This design offers advantages in terms of installation and transportation, making them particularly suitable for projects with strict requirements for weight and cost. Contact us

ASME B16.47 Standard

Scope

This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included here are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (metric) and U.S. Customary units, with diameter of bolts and flange bolt holes expressed in inch units. This Standard is limited to

(a) flanges made from cast or forged materials

(b) blind flanges made from cast, forged, or plate materials (see Tables 1 and 2)Also, included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.

Flange Series

This Standard provides two series of flange dimensions. Series A specifies flange dimensions for general use flanges. Series Bspecifies flange dimensions for com-pact flanges that, in most cases, have smaller bolt circle diameters than Series A flanges. These two series of flanges are, in general, not interchangeable. The user should recognize that some flanged valves, equipment bolted between flanges, and flanged equipment may be compatible with only one series of these flanges.

Material & Grades of ASME B16.47 Series A Flanges

Carbon Steel Flanges :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel Flanges :
ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61

Copper Alloy Steel Flanges :

ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

ASME B16.47 Series B Class 75 Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	762	33.27	33.27	58.67	661.92	676.15	704.85	36	19.05	723.9	7.87
28	812.8	33.27	33.27	61.98	712.72	726.95	755.65	40	19.05	774.70	7.87
30	863.6	33.27	33.27	65.02	763.52	777.75	806.45	44	19.05	825.50	7.87
32	914.4	35.05	36.58	69.85	814.32	828.55	857.25	48	19.05	876.30	7.87
34	965.2	35.05	38.10	73.15	865.12	879.35	908.05	52	19.05	927.10	7.87
36	1033.5	36.58	42.42	85.85	915.92	934.97	965.20	40	22.35	992.12	9.65
38	1084.3	38.10	44.45	88.90	966.72	985.77	1016.0	40	22.35	1042.9	9.65
40	1135.1	38.10	44.45	91.95	1017.5	1036.57	1066.8	44	22.35	1093.7	9.65
42	1185.9	39.62	47.75	95.25	1068.3	1087.37	1117.6	48	22.35	1144.5	9.65
44	1251.0	42.93	49.28	104.65	1119.1	1139.95	1174.8	36	25.40	1203.5	9.65
46	1301.8	44.45	50.80	107.95	1169.9	1190.75	1225.6	40	25.40	1254.3	9.65
48	1352.6	45.97	53.85	111.25	1220.7	1241.55	1276.4	44	25.40	1305. 1	9.65

ASME B16.47 Series B Class 150 Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	785.88	41.15	44.45	88.90	661.92	684.28	711.20	36	22.35	744.47	9.65
28	836.68	44.45	47.75	95.25	712.72	735.08	762.00	40	22.35	795.27	9.65
30	887.48	44.45	50.80	100.08	763.52	787.40	812.80	44	22.35	846.07	9.65
32	941.32	45.97	53.85	107.95	814.32	839.72	863.60	48	22.35	900.18	9.65
34	39.56 1004.8	49.28	57.15	110.24	865.12	892.05	920.75	40	25.40	957.33	9.65
36	1057.1	52.32	58.67	117.35	915.92	944.63	971.55	44	25.40	1009.7	9.65
38	1124.0	53.85	63.50	123.95	968.25	996.95	1022.4	40	28.45	1069.8	9.65
40	1174.8	55.63	66.55	128.52	1019.0	1049.3	1079.5	44	28.45	1120.6	9.65
42	1225.6	58.67	68.33	133.35	1069.8	1101.9	1130.3	48	28.45	1171.4	11.18
44	1276.4	60.45	71.37	136.65	1120.6	1152.7	1181.1	52	28.45	1222.2	11.18
46	1341.4	61.98	74.68	144.53	1171.4	1205.0	1234.9	40	31.75	1284.2	11.18
48	1392.2	65.02	77.72	149.35	1222.2	1257.3	1289.1	44	31.75	1335.0	11.18

ASME B16.47 Series B Class 300 Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	866.65	88.90	88.90	144.53	665.23	701.55	736.60	32	35.05	803.15	14.22
28	920.75	88.90	88.90	149.35	716.03	755.65	787.40	36	35.05	857.25	14.22
30	990.60	93.73	93.73	157.99	768.35	812.80	844.55	36	38.10	920.75	14.22
32	1054.1	103.12	103.12	168. 15	819.15	863.60	901.70	32	41.15	977.90	15.75
34	1107.9	103.12	103.12	172.97	869.95	917.45	952.50	36	41.15	1031.7	15.75
36	1171.4	103.12	103.12	180.85	920.75	965.20	1009.7	32	44.45	1089.2	15.75
38	1222.2	111.25	111.25	192.02	971.55	1016.0	1060.5	36	44.45	1140.0	15.75
40	1273.0	115.82	115.82	198.37	1022.4	1066.8	1114.6	40	44.45	1190.8	15.75
42	1333.5	119.13	119.13	204.72	1074.7	1117.6	1168.4	36	47.75	1244.6	15.75
44	1384.3	127.00	127.00	214.38	1125.5	1173.2	1219.2	40	47.75	1295.4	15.75
46	1460.5	128.52	130.05	222.25	1176.3	1228.9	1270.0	36	50.80	1365.3	15.75
48	1511.3	128.52	134.87	223.77	1227.1	1277.9	1327.2	40	50.80	1416. 1	15.75

ASME B16.47 Series A Class 400 lb, 600 lb and 900 lb Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
Class 400
26	850.90	88.90	88.90	149.35	660.40	688.85	711.20	28	38.10	781.05	11.18
28	914.40	95.25	95.25	158.90	711.20	739.65	762.00	24	41.15	838.20	12.70
30	971.55	101.60	101.60	169.93	762.00	793.75	590.55	28	41.15	895.35	12.70
32	1035.1	107.95	107.95	179.32	812.80	844.55	873.25	28	44.45	952.50	12.70
34	1085.9	111.25	111.25	187.45	863.60	898.65	927.10	32	44.45	1003.3	14.22
36	1155.7	119.13	119.13	200. 15	914.40	952.50	980.95	28	47.75	1066.8	14.22
Class 600
26	889.00	111.25	111.25	180.85	660.40	698.50	726.95	28	44.45	806.45	12.70
28	952.50	115.82	115.82	190.50	711.20	752.35	784.35	28	47.75	863.60	12.70
30	1022.4	125.48	127	204.72	762.00	806.45	841.25	28	50.80	927.10	12.70
32	1085.9	130.05	134.87	215.90	812.80	860.55	895.35	28	53.85	984.25	12.70
34	1162.1	141.22	144.27	233.43	863.60	914.40	952.50	24	60.45	1054.1	14.22
36	1212.9	146.05	150.88	242.82	914.40	968.25	1009.7	28	60.45	1104.9	14.22
Class 900
26	1022.4	134.87	153.92	258.83	660.40	742.95	762.00	20	66.55	901.70	11.18
28	1104.9	147.57	166.62	276.35	711.20	797.05	819.15	20	73.15	971.55	12.70
30	1181.1	155.45	176.02	289.05	762.00	850.90	876.30	20	79.25	1035.1	12.70
32	1238.3	160.27	185.67	303.28	812.80	908.05	927.10	20	79.25	1092.2	12.70
34	1314.5	171.45	195.07	319.02	863.60	962. 15	990.60	20	85.85	1155.7	14.22
36	1346.2	172.97	201.68	325.37	914.40	1016.0	1028.7	24	79.25	1200.2	14.22

Differences between Series B and Series A Flanges

Thickness and Weight: Series B flanges are thinner and lighter.

Number and Size of Bolts: Series B flanges utilize a larger number of smaller-diameter bolts, while Series A flanges utilize a smaller number of larger-diameter bolts.

Strength and Load-Carrying Capacity: Series A flanges are thicker and heavier, capable of withstanding higher external loads, making them more popular in more demanding, high-pressure environments. Series B flanges are more suitable for general pipe connections.

Flange Types: ASME B16.47 Series B primarily includes weld neck flanges and blind flanges and is the only series in the standard to offer a Class 75 pressure rating.

Applications of ASME B16.47 Series B Flanges

Oil & Gas pipelines

Petrochemical plants

Water treatment and desalination projects

Power generation systems

Structural and general industrial piping

Advantages of Using Series B Flanges

Cost-effective for large diameter pipelines

Easy availability in multiple materials and sizes

Reliable sealing with fewer bolts

Reduced overall piping system weight

Why Choose ZIZI for ASME B16.47 Series B Flanges?

At ZIZI Engineering, we manufacture and supply a wide range of ASME B16.47 Series B weld neck and blind flanges. Our products are produced according to ASME, ASTM, and ANSI standards, ensuring durability and performance.

* Quality Assurance: 100% inspection before delivery
* Wide Material Range: Carbon steel, stainless steel, alloy steel, duplex
* Global Supply: Fast delivery with strong export packaging
* Customization: Available upon client request

The post ASME B16.47 Series B Flanges appeared first on Quality Manufacturer of Industrial Pipe Fittings.

ASTM A350 LF2 & A182 F316L Blind Flanges Order from Kyrgyz Customer

zhao77jie — Wed, 11 Oct 2023 09:56:24 +0000

The customer send inquiry about ASME B16.5 blind flanges in material of ASTM A350 LF2 & A182 F316L , and with addtional requirement of drill a center hole in NPT. After replying them with quotation,they didn’t have any comment on it during the first several weeks .

However, they kept asking me some question about orders which is not ours, like: I consulted other suppliers about ASTM A350 LF2 Blind Flanges ,why couldn’t they offer me quotation….Because we also manufacture the items they have question with, I confirmed these questions with our factory and solved their queries.In the end, I get several purchase orders from this value customer.

Purchase Order List

BLIND-FLANGE-WITH-NPT-HOLE

Short Description of Goods	Quantity	Unit
Blind Flange, ASTM A350 GR.LF2,RF,CL900,DN200,1/2IN NPT Flanges	2	PCS
Blind Flange, ASTM A350 GR.LF2,RF,CL300,DN40,1/2IN NPT Flanges	1	PCS
Blind Flange. ASTM A350 LF2,RF,LT,CL300,DN50,1IN NPT Flanges	4	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL300,DN40,3/4IN NPT Flanges	1	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL150,DN40,1/2IN NPT Flanges	1	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL1500,DN40,1IN NPT Flanges	1	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL300,DN50,1/2IN NPT Flanges	3	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL600,DN50,1/2IN NPT Flanges	2	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL300,DN50,2IN NPT Flanges	1	PCS
Blind Flange, ASTM A350 LF2,RF,CL300/600,1/2IN NPT,DN15 Flanges	3	PCS
Blind Flange, ASTM A350 LF2,RF,CL300,1/2IN NPT,DN150 Flanges	1	PCS
Blind Flange, ASTM A350 GR.LF2,RF,LT,CL900,DN200 Flanges	2	PCS
Blind Flange, ASTM A 182 F316/316L,RF,CL300,DN20 Flanges	4	PCS
TOTAL	26	PCS

ASTM A350 GRADE LF2 Flanges Properties

The ASTM A350 LF2 flanges is a forged carbon/ low-alloy steel forged flanges, this material is also for forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing.

Chemical Composition %

C	Mn	P	S	Si	Ni	Cr	Mo	Cu	Nb	V
≤ 0.30	0.60~1.35	≤ 0.035	≤ 0.040	0.15~0.30	≤ 0.40	≤ 0.30	≤ 0.12	≤ 0.40	≤ 0.02	≤ 0.08

Mechanical Properties

Tensile Strength, ksi [MPa]	Yield strength, ksi [MPa], min.	ELr, min. %	ELs, min. %	ELc, min. %	Reduction of Area, min. %	Hardness, max. HBW
70-95 [485–655]	36 [250]	22	30	48t + 15	30	197

ASTM A182 F316 /F316L ASME B16.5 Flanges Properties

Stainless steel grade 316/316L is the most commonly used austenitic stainless steel in the chemical process industry. The addition of molybdenum increases general corrosion resistance, improves chloride pitting resistance and strengthens the alloy in high temperature service. Through the controlled addition of nitrogen it is common for 316/316L to meet the mechanical properties of 316 straight grade, while maintaining a low carbon content.Flanges in material A350 LF2 is better than it is in A182 F316/316L in every term.

Chemical Composition %

	Ni	Cr	Mo	Mn	Si	C	S	P	N	Fe
MIN	10.0	16.0	2.0	–	–	–	–	–	–	–
MAX	14.0	18.0	3.0	2.0	0.75	0.03	0.03	0.045	0.1	Balance

Physical Properties

Density: 0.285 lb/inch3
Poisson’s Ratio: 0.3
Electrical Resistivity: 445 Ohm-circ mil/ft

Temperature, °F	Coefficient* of Thermal Expansion, in/in°F x 10-6	Thermal Conductivity Btu • ft/ft2 • hr • °F	Modulus of Elasticity Dynamic, psi x 106
70	–	7.8	29
212	9.2	–	–
932	10.1	–	–
1832	10.8	–	–

Mechanical Properties

Ultimate Tensile Strength, ksi	0.2% Yield Strength, ksi	Elongation, %	Hardness MAX, Brinell
75	30	40	217

We are manufacture of all kinds of ANSI / ASME B16.5 flanges (Blind, Socket Weld, Slip On, Weld Neck, Threaded, Ring Type Joint).

Specification of ASME B16.5 Flanges

Sealing Face	RF, FF, FTJ
Size Range	1/2” – 48” / DN15 – DN1200
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
Material	Carbon Steel, Alloy Steel, Stainless Steel

Service and quality are always our goal for customers.

The post ASTM A350 LF2 & A182 F316L Blind Flanges Order from Kyrgyz Customer appeared first on Quality Manufacturer of Industrial Pipe Fittings.