ASTM A182 F904L Blind & Weld Neck Flanges Order

On April 25, 2025, a regular customer from Shanghai sent us an inquiry for blind  & weld neck flanges in ASTM A182 F904L. This material grade and product type are common to us, so we completed the quote quickly and the customer placed the order a week later.

ZIZI is a manufacturer specializing in the production and processing of flanges. Our products are mainly used in the chemical, oil, gas, water conservancy, power generation and offshore industries. Our products cover a wide range of flanges in various materials and sizes. The materials we offer include carbon steel, stainless steel, alloy steel, cryogenic steel, duplex steel and super alloys.

Purchase List:

ITEM	DESCRIPTION	QUANTITY	UNIT
1	BLIND FLANGE, DN200 RF, PN16 ASTM A182 F-904L. FORGED.EN 1092	6	EA
2	BLIND FLANGE,DN100 RF, PN10 ASTM A182 F-904L. FORGED. EN 1092	8	EA
3	BLIND FLANGE, DN80 RF, PN10 ASTM A182 F-904L, FORGED, EN 1092	4	EA
4	BLIND FLANGE, DN50 RF, PN10 ASTM A182 F-904L. FORGED. EN 1092	4	EA
5	WNRF, DN100 SCh 10S, PN10 ASTM A182 F-904L, FORGED, EN 1092	8	EA
6	WNRF, DN80 SCh 10S, PN10 ASTM A182 F-904L, FORGED, EN 1092	38	EA

Weld Neck Flange Inspection:

✅Appearance Inspection: mainly for surface quality and process defects, usually done visually or by simple tools.

✅Flange Outer Diameter (OD): Measure whether the maximum outer diameter of the flange meets the tolerance requirements.

✅Bolt hole center circle diameter (PCD): check whether the diameter of the distribution circle of bolt holes is accurate.

✅Number and Diameter of Bolt Holes (NBH): Check whether the number of holes, hole diameter and positional degree are consistent with the standard.

✅Flange thickness (Thickness): including overall thickness and neck thickness.

✅Flange Height (H): the vertical distance from the end face of the flange to the welding end.

✅Neck Big End Diameter (NBD): refers to the inner diameter of the flange neck where it connects with the flange disk.

✅Machined dimensions of the raised face (RF): used to install the gasket to realize the seal.

Blind Flange Inspection:

✅Appearance Inspection: mainly for surface quality and process defects, usually done visually or by simple tools.

✅Outside Diameter (OD): Measure the outside diameter of the flange to ensure that it conforms to the design standard dimensions.

✅Inside Diameter (ID): Check the diameter of the flange’s inner hole to make sure it is the same size as the pipe connection.

✅Flange Thickness: Measure the overall thickness of the flange to ensure compliance with the thickness tolerance specified in the standard.

✅Bolt hole size: Check the diameter and number of bolt holes to ensure that the matching bolts can be installed correctly.

✅Hole center distance: check whether the center distance of the bolt holes meets the standard and design requirements.

Dimension of Weld Neck Flange:

Pressure ratings of weld neck flanges include 150#, 300#, 400#, 600#, 900#, 1500# and 2500#.

150# weld neck flange:

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	88.90	15.70	11.20	47.80	21.30	30.20	35.00	4	15.70	60.45	0.48
3/4	26.70	98.60	20.80	12.70	52.30	26.70	38.10	42.90	4	15.70	69.85	0.71
1	33.40	108.0	26.70	14.20	55.60	33.50	49.30	50.80	4	15.70	79.25	1.01
11/4	42.20	117.3	35.10	15.70	57.15	42.20	58.70	63.50	4	15.70	88.90	1.33
11/2	48.30	127.0	40.90	17.50	62.00	48.30	65.00	73.15	4	15.70	98.60	1.72
2	60.30	152.4	52.60	19.10	63.50	60.45	77.70	91.90	4	19.10	120.7	2.58
21/2	73.00	177.8	62.70	22.40	69.85	73. 15	90.4	104.6	4	19.10	139.7	4.11
3	88.90	190.5	78.00	23.90	69.85	88.90	108.0	127.0	4	19.10	152.4	4.92
31/2	101.6	215.9	90.20	23.90	71.40	101.6	122.2	139.7	8	19.10	177.8	6.08
4	114.3	228.6	102.40	23.90	76.20	114.3	134.9	157.2	8	19.10	190.5	6.84
5	141.3	254.0	128.3	23.90	88.90	141.2	163.6	185.7	8	22.40	215.9	8.56
6	168.3	279.4	154.2	25.40	88.90	168.4	192.0	215.9	8	22.40	241.3	10.6
8	219.1	342.9	202.7	28.40	101.6	219.2	246.1	269.7	8	22.40	298.5	17.6
10	273.0	406.4	254.5	30.20	101.6	273.0	304.8	323.8	12	25.40	362.0	24.0
12	323.8	482.6	304.8	31.75	114.3	323.8	365.3	381.0	12	25.40	431.8	36.5
14	355.6	533.4	To be specified by the Purchaser	35.10	127.0	355.6	400.1	412.7	12	28.40	476.3	48.4
16	406.4	596.9		36.60	127.0	406.4	475.2	469.9	16	28.40	539.8	60.6
18	457.2	635.0		39.60	139.7	457.2	505.0	533.4	16	31.75	577.9	68.3
20	508.0	698.5		42.90	144.5	508.0	558.8	584.2	20	31.75	635.0	84.5
24	609.6	812.8		47.80	152.4	609.6	663.4	692.1	20	35.10	749.3	115

 

Dimension of Blind Flange:

Pressure ratings of weld neck flanges include 150#, 300#, 400#, 600#, 900#, 1500# and 2500#.

150# blind flange：

Norminal Pipe Size		A	C	G	H	I	J	Weight
inch	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.3	88.9	11.2	35. 10	4	15.7	60.45	0.42
3/4	26.7	98.6	12.7	42.9	4	15.7	69.85	0.61
1	33.4	108	14.2	50.8	4	15.7	79.25	0.86
11/4	42.2	117.3	15.7	63.5	4	15.7	88.9	1.17
11/2	48.3	127	17.5	73. 15	4	15.7	98.6	1.53
2	60.3	152.4	19. 10	91.9	4	19.1	120.7	2.42
21/2	73.0	177.8	22.4	104.6	4	19.1	139.7	3.94
3	88.9	190.5	23.9	127	4	19.1	152.4	4.93
31/2	101.6	215.9	23.9	139.7	8	19.1	177.8	6.17
4	114.3	228.6	23.9	157.2	8	19.1	190.5	7.00
5	141.3	254	23.9	185.7	8	22.4	215.9	8.63
6	168.3	279.4	25.4	215.9	8	22.4	241.3	11.3
8	219.1	342.9	28.4	269.7	8	22.4	298.5	19.6
10	273.0	406.4	30.2	323.9	12	25.4	362	28.8
12	323.8	482.6	31.75	381	12	25.4	431.8	43.2
14	355.6	533.4	35. 10	412.8	12	28.4	476.3	58.1
16	406.4	596.9	36.6	469.9	16	28.4	539.8	76.0
18	457.2	635	39.6	533.4	16	31.75	577.9	93.7
20	508.0	698.5	42.9	584.2	20	31.75	635	122
24	609.6	812.8	47.8	692.2	20	35.1	749.3	185

 

ASTM A182 F904L Flange Material Analysis：

Chemical Composition：

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Ti	Cu
ASTM A182 F904L  (N08904)	MIN						23.00	19.00	4.00			1.00
	MAX	0.02	2.00	0.040	0.030	1.00	28.00	23.00	5.00	0.10		2.00

 

Mechanical properties：

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %
ASTM A182 F904L	490 min	215 min	35 min

 

Application Areas of Weld Neck Flange：

• Oil & Gas
• Chemical Industry
• Power Industry
• Shipbuilding
• Paper & Metallurgy
• Water & Heating

Application Areas of Blind Flange：

• Oil & Gas
• Chemical Industry
• Food & Pharmaceuticals
• Power Industry
• Aerospace
• Water Treatment