150# 904L Forged Flanges Order

On March 26, 2025, an old customer sent us an inquiry for 904L forged flanges, including three types: slip on flanges, blind flanges and weld neck flanges. The customer had purchased this type of product and material from us before, so after confirming the price, the customer placed an order quickly.

 

ZIZI is a company specializing in the production and processing of pipes and fittings. The company’s main products include pipe fittings (such as tees, elbows, reducers), flanges, valve accessories, etc. made of carbon steel, stainless steel, alloy steel, etc., which are widely used in petrochemical, natural gas transportation, power stations, nuclear power projects and other scenes to meet the requirements of high pressure, high temperature, corrosion resistance and other harsh working conditions.

 

Purchase List

 

1	SORF, DN200 Sch 10S, PN16 ASTM A182 F-904L, FORGED, ASME B 16.5
2	WNRF, DN25 Sch 10S, #150 ASTM A182 F-904L, FORGED, ASME B 16.5
3	BLIND FLANGE, DN125 Sch 10S, #150 ASTM A182 F-904L, FORGED, ASME B 16.5
4	BLIND FLANGE, DN100 Sch 10S, #150 ASTM A182 F-904L, FORGED, ASME B 16.5
5	BLIND FLANGE, DN25 Sch 10S, #150 ASTM A182 F-904L, FORGED, ASME B 16.5

Product Photo

 

 

Specification of 904L Forged Flanges

 

904L forged flanges are high-performance pipe connection components made from 904L stainless steel—an austenitic, non-stabilized alloy with very high corrosion resistance. These flanges are ideal for aggressive environments involving acids, chlorides, and seawater.

Shape Type	Regular and Long Neck
Sealing Face	RF, FF, FTJ
Size Range	1/2″ – 48″/ DN15 – DN1200
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
Standard	ASME B16.5, ASME B16.47 Series A/B
Carbon Steel	ASTM A105 / A105N
Low Temp Carbon Steel	ASTM A350 LF2/LF3
Pipeline Steel	ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel	ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel	ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel	ASTM A182 F51, F53, F44

 

ASTM A182 F904L Forged Flange 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
	MAX	0.02	2.00	0.040	0.030	1.00	28.00	23.00	5.00	0.10		2.00

ASTM A182 F904L Forged Flange Mechanical Property

 

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

150# Forged Flange Dimension

 

Dimensions of Class  150 Flanges (Cont’d)
Nominal Pipe Size, NPS	Outside Diameter of Flange, O	Minimum Thickness of Flange, tf [Notes (2)-(4)]	Minimum Thickness Lap Joint, tf	Diameter of Hub, X	Hub Diameter Beginning of Chamfer Welding Neck, Ah [Note (5)]	Length Through Hub		Minimum Thread Length Threaded, T [Note (6)]	Bore	Welding Neck/ Socket Welding, B [Note (7)]
						Threaded/ Slip-on/ Socket Welding,              Y	Welding Neck, Y		Minimum Slip-on/ Socket     Welding,                 B
1/2	90	9.6	11.2	30	21.3	14	46	16	22.2	15.8
3/4	100	11.2	12.7	38	26.7	14	51	16	27.7	20.9
1	110	12.7	14.3	49	33.4	16	54	17	34.5	26.6
1 1/4	115	14.3	15.9	59	42.2	19	56	21	43.2	35.1
1 1/2	125	15.9	17.5	65	48.3	21	60	22	49.5	40.9
2	150	17.5	19.1	78	60.3	24	62	25	61.9	52.5
2 1/2	180	20.7	22.3	90	73.0	27	68	29	74.6	62.7
3	190	22.3	23.9	108	88.9	29	68	30	90.7	77.9
3 1/2	215	22.3	23.9	122	101.6	30	70	32	103.4	90.1
4	230	22.3	23.9	135	114.3	32	75	33	116.1	102.3
5	255	22.3	23.9	164	141.3	35	87	36	143.8	128.2
6	280	23.9	25.4	192	168.3	38	87	40	170.7	154.1
8	345	27.0	28.6	246	219.1	43	100	44	221.5	202.7
10	405	28.6	30.2	305	273.0	48	100	49	276.2	254.6
12	485	30.2	31.8	365	323.8	54	113	56	327.0	304.8
14	535	33.4	35.0	400	355.6	56	125	57	359.2	Note(8)
16	595	35.0	36.6	457	406.4	62	125	64	410.5	Note(8)
18	635	38.1	39.7	505	457.0	67	138	68	461.8	Note(8)
20	700	41.3	42.9	559	508.0	71	143	73	513.1	Note(8)
24	815	46.1	47.7	663	610.0	81	151	83	616.0	Note(8)

Packaging considerations

 

Before packaging, the flange surface should be thoroughly cleaned of impurities such as oil, moisture, and iron filings, and plastic film or bubble film should be applied for basic protection. Each flange should be wrapped in a plastic bag or bubble film, and then packed in a carton or thickened cardboard box. The interior should be filled with foam, pearl cotton and other cushioning materials to prevent shaking or collision during transportation. At the same time, use PVC flange covers, rubber gaskets or plastic plugs to seal the sealing surface and bolt holes of the flange to ensure that key parts are not damaged.

 

Applications:

 

Chemical and petrochemical plants

Seawater treatment and desalination

Acid production and transfer systems

Heat exchangers and pressure vessels

Pharmaceutical and food processing