Stainless Steel Flange Archives | Quality Manufacturer of Industrial Pipe Fittings

Carbon & Stainless Steel Flange

zhao77jie — Wed, 06 Aug 2025 02:33:38 +0000

On June 6, 2025, our domestic long-term customer sent us a quotation request for carbon & stainless steel flange, including weld neck flanges and socket weld flanges, covering multiple specifications and pressure ratings. Upon receiving the request, we immediately confirmed the product specifications and calculated the costs, and provided the customer with a detailed quotation and delivery schedule on the same day. The client expressed satisfaction with our response speed and technical support and placed an official order one month later.

ZIZI is a professional manufacturer specializing in the production and processing of pipes and fittings. Our pipes and pipe fittings are primarily used in industries such as chemicals, petroleum, natural gas, water conservancy, power, and marine engineering. Our product range includes various sizes of seamless pipes, welded pipes, butt-welded pipe fittings, high-pressure forged pipe fittings, and flanges. Materials used include carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, and base alloys.Welcome to contact us.

Products Lists

ITEM	Description	Quantity	Units
1	WN RF CL150 A105 ASME B16.5 SCH80	14	piece
2	WN RF CL150 A105 ASME B16.5 XXS	10	piece
3	WN RF CL150 A105 ASME B16.5 SCH80	17	piece
4	WN RF CL150 A182-F51 ASME B16.5 SCH40S	10	piece
5	WN RF CL300 A182-F316L ASME B16.5 SCH80S	40	piece
6	WN RF CL300 A182-F316L ASME B16.5 SCH40S	11	piece
7	SW RF CL150 A182-F316L ASME B16.5	4	piece
8	SW RF CL150 A105 ASME B16.5 SCH160	6	piece
9	SW RF CL150 A105 ASME B16.5 XXS	6	piece
10	SW RF CL300 A182-F316L ASME B16.5 SCH80S	6	piece
11	SW RF CL300 A182-F316L ASME B16.5 SCH80S	12	piece

Inspection Photos

ASME B16.5 Forged Flange Specification

Size:	1/2 to 24 Inch / DN15 — DN600
Pressure:	Class 150, 300, 600, 900, 1500, 2500
Seal Type:	Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)
Seal Thickness:	Sch 10S, 20, STD, 40, XS, 80, 160, XXS
Alloy Steel:	ASTM A182 F1, F5, F9, F11, F12, F22, F91
Carbon Steel:	ASTM A105, A350 LF2,LF3. A694 F52, F60, F65, F70
Stainless Steel:	ASTM A182 F304, F316, F317, F321, F310
Duplex Stainless Steel:	ASTM A182 F51, F53, F55
Product:	Weld Neck Flange, Socket Weld Flange, Threaded Flange, Blind Flange, Spectacle Blind, Slip On Flange, Ring Joint Flange, Plate Flange.

ASTM A105 Carbon Steel Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Cu	Ni	Cr	Mo	V
ASTM A105	MIN		0.60			0.10
ASTM A105	MAX	0.35	1.05	0.035	0.040	0.35	0.40	0.40	0.30	0.12	0.08
ASTM A105N	MIN		0.600
ASTM A105N	MAX	0.350	1.050	0.040	0.050		0.400		0.300	0.120	0.080

ASTM A105 Carbon Steel Flange Mechanical Property

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %	HARDNESS
ASTM A105	485 min	250 min	22 min	30 min	197 max
ASTM A105N	485min	250 min	22 min	30 min	197 max

ASTM A182 F316L Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F316	MIN						10.0	16.0	2.00
ASTM A182 F316	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00	0.10
ASTM A182 F316L	MIN						10.00	16.0	2.00
ASTM A182 F316L	MAX	0.03	2.00	0.045	0.030	1.00	15.00	18.0	3.00	0.10

ASTM A182 F316L Flange Mechanical Property

MATERIAL	ASTM A182 F316	ASTM A182 F316L
T.S (MPA)	515 min	485 min
Y.S (MPA)	205 min	170 min
EL %	30 min	30 min
R/A %	50 min	50 min

ASTM A182 F51 Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F51	MIN						4.50	21.00	2.50	0.08
ASTM A182 F51	MAX	0.03	2.00	0.030	0.020	1.00	6.50	23.00	3.50	0.20

ASTM A182 F51 Flange Mechanical Property

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %
ASTM A182 F51	620 min	450 min	25 min	45 min

Class 150 Flange Dimension

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			Corner Bore Radius of Lapped Flange and Pipe, r	Depth of Socket, 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		Threaded/ Slip-on/ Socket Welding, Y	Lapped, Y	Welding Neck, Y	Minimum Thread Length Threaded, T [Note (6)]	Minimum Slip-on/ Socket Welding, B	Minimum Lapped, B	Welding Neck/ Socket Welding, B [Note (7)]	Corner Bore Radius of Lapped Flange and Pipe, r	Depth of Socket, D
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	79	125	57	359.2	360.2	Note(8)	13	…
16	595	35.0	36.6	457	406.4	62	87	125	64	410.5	411.2	Note(8)	13	…
18	635	38.1	39.7	505	457.0	67	97	138	68	461.8	462.3	Note(8)	13	…
20	700	41.3	42.9	559	508.0	71	103	143	73	513.1	514.4	Note(8)	13	…
24	815	46.1	47.7	663	610.0	81	111	151	83	616.0	616.0	Note(8)	13	…

How to Choose?

When selecting carbon steel flanges and stainless steel flanges, the following factors should be primarily considered:

Medium characteristics: If the fluid is a corrosive medium (such as acids or alkalis), stainless steel flanges must be selected. If the medium is ordinary water or oil, carbon steel flanges are more cost-effective.

Environmental conditions: If the flange is installed in a corrosive environment such as a humid or high-salt fog environment, stainless steel flanges provide better protection and reduce maintenance costs.

Budget: Under the premise of meeting performance requirements, if the budget is limited, carbon steel flanges are an economical choice.

Sanitary requirements: In the food and pharmaceutical industries, for sanitary reasons, only stainless steel flanges are typically permitted.

The post Carbon & Stainless Steel Flange appeared first on Quality Manufacturer of Industrial Pipe Fittings.

904L Weld Neck & Blind Flange Order

zhao77jie — Tue, 10 Jun 2025 02:01:14 +0000

On April 25, 2025, we received a special order from an old customer – a batch of high-performance 904L weld neck & blind flanges. This is not just a deal, but another confirmation of the long-term trust and tacit understanding between us and our customers.

This customer has always been very demanding on product quality and material performance, and this time chose 904L flanges because of its excellent performance and extraordinary durability in extremely corrosive environments. We are well aware that these flanges will become an indispensable “connection point” in their key projects, carrying the safe transportation of fluids and the stable operation of equipment.

904L is a high alloy austenitic stainless steel, known for its excellent corrosion resistance, especially in dealing with strong acidic environments (such as sulfuric acid, phosphoric acid) and chloride corrosion (pitting, crevice corrosion and stress corrosion cracking). Therefore, 904L flanges are important components for connecting critical piping systems to ensure long-term stable operation under harsh conditions.

Contact us

Purchase List

ITEM	Description	Quanitity	Unit
1	BLIND FLANGE, DN200 RF, PN16 ASTM A182 F-904L. FORGED.EN 1092	4	EA
2	BLIND FLANGE,DN100 RF, PN10 ASTM A182 F-904L. FORGED. EN 1092	6	EA
3	BLIND FLANGE, DN80 RF, PN10 ASTM A182 F-904L, FORGED, EN 1092	2	EA
4	BLIND FLANGE, DN50 RF, PN10 ASTM A182 F-904L. FORGED. EN 1092	2	EA
5	WNRF, DN100 SCh 10S, PN10 ASTM A182 F-904L, FORGED, EN 1092	6	EA
6	WNRF, DN80 SCh 10S, PN10 ASTM A182 F-904L, FORGED, EN 1092	34	EA

Dimensional Inspection of 904L Flange

Outer Diameter
Ensure overall compatibility: Verify that the flange can be properly installed within the reserved space in the piping system without interference from surrounding equipment or structures.
Thickness
Ensure pressure resistance: Flange thickness is a critical factor in determining its pressure-bearing capacity. Sufficient thickness ensures the flange will not deform or crack under rated pressure, maintaining system sealing performance.
Sealing Face Diameter
Ensure sealing integrity: This is one of the most critical inspection points. The sealing face diameter must precisely match the selected gasket size to ensure uniform compression under pressure and form an effective seal to prevent fluid leakage.
Bolt Circle Diameter (BCD)
Ensure bolt hole alignment: This is a decisive factor for proper flange connection. An accurate bolt circle diameter ensures full alignment with the mating flange’s bolt holes, allowing bolts to pass through smoothly and be evenly stressed, avoiding damage from forced installation.
Number and Diameter of Bolt Holes
Ensure connection strength: The number and diameter of bolt holes must meet the standard to ensure enough bolts are available to bear the stress at the flange connection and to apply uniform preload on the gasket.
Pipe End Outside Diameter
Ensure match with pipe OD: This is the core objective. The outside diameter of the weld neck portion of the flange must closely match the pipe’s outside diameter to ensure proper alignment during welding, reduce misalignment, and achieve a high-quality weld joint.

Specification of Forged Steel Flange

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
Stainless Steel	ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L

ASTM A182 F904L Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Ti	Cu
ASTM A182 F904L (N08904)	MIN						23	19	4			1
ASTM A182 F904L (N08904)	MAX	0.02	2	0.04	0.03	1	28	23	5	0.1		2

ASTM A182 F904L Flange Mechanical Property

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

PN16 Forged Flange Dimensions

Table 13 — Dimensions of PN 16 flanges
Dimensions in millimetres
DN	Mating dimensions					Outside diameter of neck	Bore diameters			Flange thickness				Chamfer	Collar thickness				Centre portion	Length						Neck diameters			Corner radii	Wall thickness (see 5.6.1)
	Outside diameter	Diameter of bolt circle	Diameter of bolt hole	Bolting		Outside diameter of neck	Bore diameters			Flange thickness				Chamfer	Collar thickness				Centre portion	Length						Neck diameters			Corner radii	Wall thickness (see 5.6.1)
	D	K	L	Number	Size	A	B1	B2	B3	C1	C2	C3	C4	E	F				Gmax	H1	H2	H3	H4		H5	N1	N2	N3	R1	S
	Flange type
	01, 02, 04, 05, 11, 12, 13, 21					11 21 a 34 d 35 – 37	01 12 32	02	04	01 02 04	11 12 13	21	05	02 04	32 34 d	35	36	37	05	12 13	11 34 c,d	11 34 c,d	35	36	37	11 34 c, d	12 13	21	11 12 13 21, 34d	34 d	11, 35 to 37
10	90	60	14	4	M12	172	180	21	31	14	16	16	16	3	12	5	2	25		22	35	6	35	35	7	28	30	28	4	18	See Annex A
15	95	65	14	4	M12	213	220	25	35	14	16	16	16	3	12	5	2	25		22	38	6	38	38	7	32	35	32	4	20
20	105	75	14	4	M12	269	275	31	42	16	18	18	18	4	14	6	25	3		26	40	6	40	40	8	40	45	40	4	23
25	115	85	14	4	M12	337	345	38	49	16	18	18	18	4	14	7	25	3		28	40	6	40	40	10	46	52	50	4	26
32	140	100	18	4	M16	424	435	47	59	18	18	18	18	5	14	8	3	3		30	42	6	42	42	12	56	60	60	6	26
40	150	110	18	4	M16	483	495	53	67	18	18	18	18	5	14	8	3	3		32	45	7	45	45	15	64	70	70	6	26
50	165	125	18	4	M16	603	615	65	77	20	18	18	18	5	16	8	3	3		28	45	8	45	45	20	74	84	84	6	29
65	185	145	18	8b	M16	761	775	81	96	20	18	18	18	6	16	8	3	3	55	32	45	10	45	45	20	92	104	104	6	29
80	200	160	18	8	M16	889	905	94	108	20	20	20	20	6	16	10	3	3	70	34	50	10	50	50	25	105	118	120	6	32
100	220	180	18	8	M16	1,143	1,160	120	134	22	20	20	20	6	18	10	4	4	90	40	52	12	52	52	25	131	140	140	8	36
125	250	210	18	8	M16	1,397	1,415	145	162	22	22	22	22	6	18	10	4	4	115	44	55	12	55	55	25	156	168	170	8	40
150	285	240	22	8	M20	1,683	1,705	174	188	24	22	22	22	6	20	10	5	5	140	44	55	12	55	55	25	184	195	190	10	45
200	340	295	22	12	M20	2,191	2,215	226	240	26	24	24	24	6	20	11	6	6	190	44	62	16	62	62	30	235	246	246	10	63
250	405	355	26	12	M24	2,730	2,765	281	294	29	26	26	26	8	22	12	10		235	46	70	16	70	68		292	298	296	12	63
300	460	410	26	12	M24	3,239	3,275	333	348	32	28	28	28	8	24	14	10		285	46	78	16	78	68		344	350	350	12	71
350	520	470	26	16	M24	3,556	3,595	365	400	35	30	30	30	8	26	18	10		330	57	82	16	82	68		390	400	410	12	80

Sulfuric acid treatment and production

Seawater and brine treatment

Marine engineering and offshore platforms

Desalination plants

Coastal power plants

Pollution control equipment

Flue gas desulfurization (FGD) systems

Chemical and petrochemical industries:

Pharmaceutical industry

Food and beverage industry

Pulp and paper industry

The post 904L Weld Neck & Blind Flange Order appeared first on Quality Manufacturer of Industrial Pipe Fittings.