Stainless Steel Flanges Order

In late March 2025, we received an inquiry for stainless steel flanges from a long-term domestic client. Drawing on years of experience, our sales representative promptly provided a quotation. Trusting our capabilities, the client placed an order. Following the order confirmation, the sales representative immediately coordinated with procurement personnel to ensure the flanges meeting the client’s specifications would be delivered promptly.

Procurement List

ITEM	Product	Dimension	Pressure	Port thickness	Material	Standard	Quantity
1	Slip On Flange	DN200	PN16	SCH10S	A182 F904L	EN1092-1	2
2	Weld Neck Flange	DN25	150#	SCH10S	A182 F904L	ASME B16.5	12
3	Blind Flange	DN125	150#	/	A182 F904L	ASME B16.5	2
4	Blind Flange	DN100	150#	/	A182 F904L	ASME B16.5	2
5	Blind Flange	DN25	150#	/	A182 F904L	ASME B16.5	3

Flange Specification

Flange Types	Weld Neck , Slip On , Blind , Socket Weld , Threaded ,  Lap Joint Flange
Flange Faces	RF ,  FF ,  FTJ , MFM , TG
Standards	ASME B16.5 ,  ASME B16.47 Series A / B ,  JIS B2220
Pressure Rating	Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500 , PN2.5 / 6 / 10 / 16 / 25 , etc
Carbon Steel Flanges	ASTM A105 , A105N
Low Temp Carbon Steel Flanges	ASTM A350 LF2 , LF3
Pipeline Steel Flanges	ASTM A694 F42 , 46 , 56 , 60 , 65
Alloy Steel Flanges	ASTM A182 F11 , 12 , 5 , 9 , 91 , 92
Stainless Steel Flanges	ASTM A182 F304 / 304L / 304H ,  316 / 316L ,  310S ,  317 , 347 , 904L
Duplex Stainless Steel Flanges	ASTM A182 F51 ,  F53 ,  F44

ASTM A182 F904L Flange

In a nutshell, it’s a high-performance stainless steel flange designed for extreme environments.

• ASTM A182: The standard for forged steel pipe flanges, fittings, valves, and parts for high-temperature service. It signifies high quality.
• F904L: The material grade. “F” means it’s Forged for strength. 904L is a “super austenitic” stainless steel known for excellent resistance to corrosive chemicals like sulfuric acid and chlorides.

Key Advantage: Its superior corrosion resistance, especially where common stainless steels like 316 would fail.

ASTM A182 F904L Material

Chemical Composition

• Chromium (Cr): 19-23%
• Nickel (Ni): 23-28%
• Molybdenum (Mo): 4-5%
• Copper (Cu): 1-2%

Mechanical Properties

• Tensile Strength: ≥490 MPa
• Yield Strength: ≥220 MPa
• Elongation: ≥35%

ASME B16.5 Standard

The weld neck flange and Blind Flange portions of the order are manufactured under the ASME B16.5 standard, which covers pipe flanges and flanged fittings NPS ½ to 24″. This standard defines dimensions, tolerances, bolt-hole patterns, pressure class ratings (for example Class 150) and sealing face types for these stainless steel flanges. By referencing ASME B16.5, the components ensure compatibility with global piping systems.

EN 1092-1 Standard

For the slip on flange (type 12 flange) DN200 PN16 stainless steel flanges, the specification EN 1092-1 applies. This European standard defines requirements for circular steel flanges with PN designations (nominal pressure) and includes material grades, dimensions, tolerances and pressure/temperature ratings. By using EN 1092-1, we guarantee that the slip-on raised face flange meets European industrial norms and is fully traceable.

PN16 Type 12 Flange Dimension

DN	Mating dimensions					Bore diameters	Flange thickness	Length	Neck diameters	Corner radii
	Outside diameter	Diameter of bolt circle	Diameter of bolt hole	Bolting
	D	K	L	Number	Size	B1	C2	H1	N2	R1
10	90	60	14	4	M12	18.0	16	22	30	4
15	95	65	14	4	M12	22.0	16	22	35	4
20	105	75	14	4	M12	27.5	18	26	45	4
25	115	85	14	4	M12	34.5	18	28	52	4
32	140	100	18	4	M16	43.5	18	30	60	6
40	150	110	18	4	M16	49.5	18	32	70	6
50	165	125	18	4	M16	61.5	18	28	84	6
65	185	145	18	8b	M16	77.5	18	32	104	6
80	200	160	18	8	M16	90.5	20	34	118	6
100	220	180	18	8	M16	116.0	20	40	140	8
125	250	210	18	8	M16	141.5	22	44	168	8
150	285	240	22	8	M20	170.5	22	44	195	10
200	340	295	22	12	M20	221.5	24	44	246	10
250	405	355	26	12	M24	276.5	26	46	298	12
300	460	410	26	12	M24	327.5	28	46	350	12
350	520	470	26	16	M24	359.5	30	57	400	12
400	580	525	30	16	M27	411.0	32	63	456	12
450	640	585	30	20	M27	462.0	34	68	502	12
500	715	650	33	20	M30	513.5	36	73	559	12
600	840	770	36	20	M33	616.5	40	83	658	12
700	910	840	36	24	M33	c	40	83	760	12
800	1 025	950	39	24	M36		41	90	864	12
900	1 125	1 050	39	28	M36		48	94	968	12
1 000	1 255	1 170	42	28	M39	c	59	100	1 072	16
1 200	1 485	1 390	48	32	M45	—	78	—	—	16
1 400	1 685	1 590	48	36	M45	—	84	—	—	16
1 600	1 930	1 820	56	40	M52	—	102	—	—	16
1 800	2 130	2 020	56	44	M52	—	110	—	—	16
2 000	2 345	2 230	62	48	M56	—	124	—	—	16
c  To be specified by the purchaser.

 

Class 150 Weld Neck Flange Dimension

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

 

Class 150 Blind Flange Dimension

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

Sch 10S (Schedule 10 Stainless)

“Sch” is the abbreviation for “Schedule,” a widely used system for designating pipe wall thickness grades.The higher the number following “Sch,” the thicker the pipe wall and the greater its pressure-bearing capacity.

The “S” in “10S” stands for stainless steel.

“Sch 10S” refers to the “connection size” of this flange being compatible with “pipes of Schedule 10S wall thickness.” It is not the flange’s pressure rating itself, but rather the specification of its connection port.