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Raised Face Carbon Steel Weld Neck Flange LF2 Class 300 ANSI B16.5

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Raised Face Carbon Steel Weld Neck Flange LF2 Class 300 ANSI B16.5

Country/Region	china
City & Province	shanghai shanghai
Categories	Flanges

Product Details

ASTM A350 LF2 ANSI B16.5 WN RF Class 300 Carbon Steel Weld Neck Raised Face Flange

Product Information

Product Name	ASTM A350 LF2 ANSI B16.5 WN RF Class 300 Carbon Steel Weld Neck Raised Face Flange
Size Range	1/2” to 24”
Pressure Class	Class 300
Standards	ASTM A350 LF2
Face Type	WNRF-Weld Neck Raised Face
Specification	ANSI B16.5
Coating	Anti-rust Paint, Could and Hot Dip Galvanized, Zinc Plated, Yellow Transparent, Oil Black Paint

ASTM A350

ASTM A350 (ASME SA350) is the standard specification for carbon steel and low alloy steel forged flanges and flanged fittings for low temperature services.

Common use grade is ASTM A350 LF2 Class 1, corresponding material for piping in ASTM A333 Grade 6 and pipe fittings in ASTM A420 WPL6. With yield strength minimum 240 MPa, and tensile strength in 480 MPa to 655 MPa, impact test temperature at -45℃.

ASTM A350 Chemical Composition (%)

	Chemical Composition (%)
	Grade LF1	Grade LF2	Grade LF3	Grade LF5	Grade LF6	Grade LF9	Grade LF787
C max	0.30	0.30	0.20	0.20~0.35	0.22	0.20	0.07
Mn	0.60~1.35	0.60~1.35	0.90 max	0.60~1.35	1.15~1.50	0.40~1.06	0.40~0.70
P max	0.035	0.035	0.035	0.035	0.025	0.035	0.025
S max	0.04	0.04	0.04	0.04	0.025	0.04	0.025
Si ^A	0.15~0.3	0.15~0.3	0.20~0.35	0.20~0.35	0.15~0.3	﹍	0.40 max
Ni	0.40 max ^B	0.40 max ^B	3.30~3.70	1.0~2.0	0.40 max ^B	1.60~2.4	0.70~1.0
Cr	0.30 max ^B,C	0.30 max ^B,C	0.30 max ^C	0.30 max ^C	0.30 max ^B,C	0.30 max ^C	0.60~0.90
Mo	0.12 max ^B,C	0.12 max ^B,C	0.12 max ^C	0.12 max ^C	0.12 max ^B,C	0.12 max ^C	0.15~0.25
Cu	0.40 max ^B	0.40 max ^B	0.40 max	0.40 max	0.40 max ^B	0.75~1.25	1.0~1.3
Cb	0.02 max ^D	0.02 max ^D	0.02 max	0.02 max	0.02 max	0.02 max	0.02 min
V	0.08 max	0.08 max	0.03 max	0.03 max	0.04~0.11	0.03 max	0.03 max
N	﹍	﹍	﹍	﹍	0.01~0.03	﹍	﹍

^A When vacuum carbon-deoxidation is required by Supplementary Requirement S4, the silicon content shall be 0.12%

^B The sum of copper nickel chromium vanadium and molybdenum shall not exceed 1.00% on heat analysis.

^C The sum of chromium and molybdenum shall not exceed 0.32% on heat analysis.

^D By agreement, the limit for columbium may be increased up to 0.05% on heat analysis and 0.06% on product analysis

Flange Type:Weld Neck Flange (WN)

A weld neck flange, also called a tapered hub flange or high-hub flange, is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. There are two welding neck flanges designs – the first type is used with pipes while the second, longer type cannot be used with pipes but with a process plant. The weld neck flange comprises of a round fitting that extends beyond the rim of the circumference. These flanges, typically manufactured from forging, are actually welded to pipes.

Face Type: Raised Face (RF)

The Raised Face flange is the most common type used in process plant applications, and is easily to identify. It is referred to as a raised face because the gasket surfaces are raised above the bolting circle face. This face type allows the use of a wide combination of gasket designs, including flat ring sheet types and metallic composites such as spiral wound and double jacketed types.

The purpose of a RF flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint. Diameter and height are in ASME B16.5 defined, by pressure class and diameter. Pressure rating of the flange determines the height of the raised face.

ANSI B16.5 Flange Dimensions - Class 300 (mm)

Nominal Size		Outside Dia.	Thickness	Length thru Hub			Dia. of Hub	Raised Face Dia.	Corner Radius of Bore	Depth of Socket	Counter Bore	Thread Length	Bolt Holes
Nominal Size		Outside Dia.	Thickness	WN	SO SW TR	LJ	Dia. of Hub	Raised Face Dia.	LJ	SW	TR		Bolt Circle Dia.	No	Dia.
A	B	O	t	Y1	Y2	Y3	X	R	r1	D	B4	Q	C	No	H
15	1/2	95	14.3	52.3	22		38.0	35.1	3	10	23.5	15.7	66.5	4	16
20	3/4	117	15.8	57.2	25		48.0	42.9	3	11	29.0	15.7	82.6	4	19
25	1	124	17.6	62.0	27		54.0	50.8	3	13	36.0	17.5	88.9	4	19
32	1-1/4	133	19.1	65.0	27		63.4	63.5	5	14	44.5	20.6	98.6	4	19
40	1-1/2	155	20.6	6.3	30		70.0	73.2	6	16	50.5	22.4	114.3	4	22
50	2	165	22.4	69.8	33		84.0	91.9	8	18	63.5	28.4	127.0	8	19
65	2-/21	190	25.4	76.2	38		100	104.6	8	19	76.0	31.8	149.4	8	22
80	3	210	28.5	79.2	43		117	127.0	10	21	92.0	31.8	168.1	8	22
90	3-1/2	229	30.3	81.0	44		133	139.7	10		105.0	36.6	184.2	8	22
100	4	254	31.8	85.9	48		146	157.2	11		118.0	36.6	200.2	8	22
125	5	279	35.1	98.6	51		178	185.7	11		145.0	42.9	235.0	8	22
150	6	318	36.6	98.6	52		206	215.9	13		171.0	46.0	269.7	12	22
200	8	381	41.2	111.3	62		260	269.7	13		222.0	50.8	330.2	12	26
250	10	444	47.8	117.3	67	95	321	323.8	13		276.0	55.6	387.4	16	29
300	12	520	50.8	130.0	73	102	375	381.0	13		329.0	60.5	450.8	16	32
350	14	585	53.9	142.7	76	111	425	412.8	13		360.0	63.5	514.4	20	32
400	16	650	57.2	146.0	83	121	483	469.9	13		411.0	68.3	571.5	20	35
450	18	710	60.5	158.8	89	130	533	533.4	13		462.0	69.8	628.6	24	35
500	20	775	63.5	162.1	95	140	587	584.2	13		513.0	73.2	685.8	24	35
600	24	915	69.9	168.1	106	152	702	692.2	13		614.0	82.6	812.8	24	42

Nominal Size		Dimensions of Ring Joint Flanges						Weight (kg)
Nominal Size		Groove Number	Dia. of Raised Portion	Pitch Dia.	Depth	Width	Radius at Bottom	WN Sch 40	SO	BL	SW Sch 40	LJ	TR
A	B	Groove Number	K	P	E	F	r2	WN Sch 40	SO	BL	SW Sch 40	LJ	TR
15	1/2	R11	51.0	34.14	5.56	7.14	0.8	0.75	0.65	0.65	0.66	0.71	0.65
20	3/4	R13	63.5	42.88	6.35	8.74	0.8	1.27	1.11	1.11	1.14	1.20	1.10
25	1	R16	70.0	50.80	6.35	8.74	0.8	1.64	1.39	1.43	1.43	1.49	1.35
32	1-1/4	R18	79.5	60.32	6.35	8.74	0.8	2.07	1.70	1.83	1.75	1.81	1.69
40	1-1/2	R20	90.5	68.28	6.35	8.74	0.8	2.94	2.51	2.69	2.58	2.66	2.54
50	2	R23	108	82.55	7.92	11.91	0.8	3.45	2.91	3.22	2.97	3.02	2.92
65	2-/21	R26	127	101.60	7.92	11.91	0.8	5.10	4.22	4.86	4.41	4.37	4.24
80	3	R31	147	123.82	7.92	11.91	0.8	6.25	5.88	6.83	6.15	6.04	5.94
90	3-1/2	R34	159	131.78	7.92	11.91	0.8	8.78	7.44	8.85		7.64	7.90
100	4	R37	175	149.22	7.92	11.91	0.8	11.4	9.73	11.8		9.98	9.71
125	5	R41	210	180.98	7.92	11.91	0.8	15.4	12.5	15.8		12.7	12.4
150	6	R45	242	211.12	7.92	11.91	0.8	19.8	16.2	21.3		16.5	16.2
200	8	R49	302	269.88	7.92	11.91	0.8	30.5	24.8	34.6		25.2	24.8
250	10	R53	356	323.85	7.92	11.91	0.8	44.1	35.5	54		40.2	35.9
300	12	R57	413	381.00	7.92	11.91	0.8	64	51	79		58	51.5
350	14	R61	458	419.90	7.92	11.91	0.8	88	70	106		86.2	70.1
400	16	R65	508	469.90	7.92	11.91	0.8	113	90	139		113.4	90.4
450	18	R69	575	533.40	7.92	11.91	0.8	138	109	175		133.8	109.0
500	20	R73	635	584.20	9.52	13.49	1.5	169	135	221		167.8	136.0
600	24	R77	750	692.15	11.13	16.66	1.5	249	204	341		249.5	204.0