ANSI B16.5 400LB 304 Stainless Steel High - Neck Butt - Welded American Standard Flange

High-Quality Forged Stainless Steel Flanges & Pipe Fittings
WE PRODUCE FORGED FLANGES -- Your Reliable Industrial Pipeline Partner

Nominal Size		Outer Diameter	Inner Diameter	Flange Ring Height	Hub Diameter at Base	Weld End OD	Flange wall thickness	Sealing Face Diameter	Sealing Face Height	Flange Overall Height	Central circle diameter	Number of Bolt Holes	Bolt Hole Diameter
DN	NPS	A	B	C	F	E		G		D	J		I
15	1/2	95.3	15.7	14.2	38.1	21.3	5.6	35	6.4	52.3	66.5	4	15.7
20	3/4	117.3	20.8	15.7	47.8	26.7	5.9	42.9	6.4	57.2	82.6	4	19.1
25	1	124	26.7	17.5	53.8	33.5	6.8	50.8	6.4	62	88.9	4	19.1
32	1-1/4	133.4	35.1	20.6	63.5	42.2	7.1	63.5	6.4	66.6	98.6	4	19.1
40	1-1/2	155.4	40.9	22.4	69.9	48.3	7.4	73.2	6.4	69.9	114.3	4	22.4
50	2	165.1	52.6	25.4	84.1	60.5	7.9	91.9	6.4	73.2	127	8	19.1
65	2-1/2	190.5	62.7	28.4	100.1	73.2	10.5	104.6	6.4	79.3	149.4	8	22.4
80	3	209.6	78	31.8	117.3	88.9	10.9	127	6.4	82.6	168.1	8	22.4
90	3-1/2	228.6	90.2	35.1	133.4	101.6	11.4	139.7	6.4	85.9	184.2	8	25.4
100	4	254	102.4	35.1	146.1	114.3	11.9	157.2	6.4	88.9	200.2	8	25.4
125	5	279.4	128.3	38.1	177.8	141.2	12.9	185.7	6.4	101.6	235	8	25.4
150	6	317.5	154.2	41.1	206.2	168.4	14.2	215.9	6.4	103.1	269.7	12	25.4
200	8	381	202.7	47.8	260.4	219.2	16.5	269.7	6.4	117.3	330.2	12	28.4
250	10	444.5	254.5	53.8	320.5	273	18.5	323.8	6.4	124	387.4	16	31.8
300	12	520.7	304.8	57.2	374.7	323.8	19	381	6.4	136.7	450.9	16	35.1
350	14	584.2	336.6	60.5	425.5	355.6	19	412.7	6.4	149.4	514.4	20	35.1
400	16	647.7	387.4	63.5	482.6	406.4	19	469.9	6.4	152.4	571.5	20	38.1
450	18	711.2	438.2	66.6	533.4	457.2	19	533.4	6.4	165.1	628.7	24	38.1
500	20	774.7	489	69.9	587.2	508	19	584.2	6.4	168.1	685.8	24	41.1
600	24	914.4	590.6	76.2	701.5	609.6	19	692.1	6.4	174.8	812.8	24	47.8

Application

Onshore/offshore oil and gas field gathering and transportation pipeline network
Operating condition parameters: pressure 4 - 7MPa, temperature - 30~120℃, containing H₂S/CO₂ corrosive media
Technical characteristics:
The material is selected as A350 LF2 (low - temperature toughness steel) or A182 F316 (sulfur - resistant corrosion)
The RTJ sealing surface is equipped with an R - type metal ring gasket, meeting the API 6A wellhead equipment specification
Post - weld heat treatment (PWHT) is required after welding to eliminate welding residual stress
Typical case: The outlet pipeline connection of the high - pressure gas gathering station in the shale gas field needs to pass the NACE MR0175 acidic environment certification
Low - temperature pipeline of LNG liquefaction unit
Operating condition parameters: pressure 6.5MPa, temperature - 162℃
Technical characteristics:
Material of A350 LF3 (-196℃ impact test passed)
The extended neck design (≥ 2 times the pipe wall thickness) to reduce the low - temperature cold - shrinkage stress
Adopt a vacuum - jacketed cold - insulation structure flange