ASTM A182 F316/316L Socket Weld Flange Overview

ASTM A182 F316/316L Socket Weld Flange, designed in accordance with ASME B16.5 standards, is a high-integrity flange used for creating a secure pipe connection in high-pressure systems. This flange features a recessed area that receives the pipe end; welders then weld around the outer diameter to form a strong, leak-proof joint. Engineers widely use this type of flange in the oil and gas, chemical processing, and power generation industries.

Specification of ASME B16.5 Socket Weld Flange

Size Range	1/2″- 3″ / DN15 – DN80
Pressure Rating	Class 150, 300, 600, 1500
Standard	ANSI / ASME B16.5
Stainless Steel	ASTM A182 F304 / 304L / 304H, 316 / 316L, 310S, 317, 347, 904L

Introduction to ASTM A182 F316 Socket Weld Flanges:

ASTM A182: This specification covers forged low alloy and stainless steel piping components for use in pressure systems. Included are flanges, fittings, valves, and similar parts to specified dimensions or to dimensional standards, such as the ASME specifications that are referenced in Section 2.

316 Stainless Steel (F316): An austenitic stainless steel with a higher nickel and molybdenum content than standard 304 stainless steel. This addition of molybdenum significantly enhances its corrosion resistance, especially in chloride environments (reducing pitting and crevice corrosion). It also offers good strength at elevated temperatures.

316L Stainless Steel (F316L): The “L” stands for “Low Carbon.” 316L is a low-carbon version of 316. The lower carbon content (max 0.03%) is crucial for improved weldability as it minimizes carbide precipitation during welding.

Socket weld flange: It is a type of flange designed to receive the end of a pipe into a recessed area (socket) of the flange hub. Fabricators weld the pipe both at the pipe end and around the outside for a secure connection.

Material of A182 F316/316L Flange

F316/316L Socket Weld Flange Chemical Composition

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

F316/316L Socket Weld Flange Mechanical Property

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

ASTM A182 F316/L/H Flange Physical Property

Grade	Density(kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (μm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C(J/kg.K)	Electrical Resistivity (nΩ.m)
			0-100°C	0-315°C	0-538°C	at 100°C	at 500°C
316/L/H	8000	193	15.9	16.2	17.5	16.3	21.5	500	740

Dimension of Socket Weld Flange

There are many pressure levels for socket flanges, and the common pressure levels include 150#, 300#, 600#, 900#, 1500#, 2500#. The pressure level of the socket flange should be selected according to the working pressure, temperature, medium and other factors of the specific pipeline system to ensure the safety of the pipeline system.

NPS	A	B	C	D	E	K	F	G	H	I	J	W
	inch								No. of Holes	inch		kg/pc
	mm									mm
1/2	3.5	0.62	0.44	0.62	0.88	0.38	1.19	1.38	4	0.62	2.38	0.42
	88.9	15.7	11.2	15.7	22.4	9.6	30.2	35.1		15.7	60.45
3/4	3.88	0.82	0.5	0.62	1.09	0.44	1.5	1.69	4	0.62	2.75	0.59
	98.6	20.8	12.7	15.7	27.7	11.1	38.1	42.9		15.7	69.85
1	4.25	1.05	0.56	0.69	1.36	0.50	1.94	2.0	4	0.62	3.120	0.81
	108	26.7	14.2	17.5	34.5	12.70	49.3	50.8		15.7	79.25
1-1/4	4.62	1.38	0.62	0.81	1.7	0.56	2.31	2.5	4	0.62	3.5	1.07
	117.3	35.1	15.7	20.6	43.2	14.2	58.7	63.5		15.7	88.9
1-1/2	5.0	1.61	0.69	0.88	1.95	0.62	2.56	2.88	4	0.62	3.88	1.36
	127	40.9	17.5	22.3	49.5	15.7	65.0	73.15		15.7	98.6
2	6.0	2.07	0.75	1.0	2.44	0.69	3.06	3.62	4	0.75	4.75	2.10
	152.4	52.6	19.1	25.4	62.0	17.5	77.7	91.9		19.1	120.7
2-1/2	7.0	2.47	0.88	1.12	2.94	0.75	3.56	4.12	4	0.75	5.5	3.33
	177.8	62.7	22.4	28.4	74.7	19.0	90.4	104.6		19.1	139.7
3	7.5	3.07	0.94	1.19	3.57	0.81	4.25	5.0	4	0.75	6.0	3.90
	190.5	78.0	23.9	30.2	90.7	20.6	108.	127		19.1	152.4

Advantages of Socket Weld Flanges: 

 1. Strong corrosion resistance: Made of high-quality alloy and stainless steel materials, it can resist corrosion from a variety of chemical substances, thus ensuring the service life of the pipeline system.

2. Good sealing performance: The sealing surface adopts a concave and convex surface or annular surface design, which can provide a good contact area, thereby achieving a reliable sealing effect.

3. High strength and stability: Made by forging or rolling process, it has high strength and stability, and can meet the requirements for pipeline connection under high temperature and high pressure environment.

4. Convenient installation: It adopts socket welding process connection, which is easy to install, thereby reducing the installation cost.

5. Wide range of application: It is suitable for a variety of pipeline connection occasions, especially for pipeline systems under high temperature and high pressure environment, such as petroleum, chemical industry, natural gas and other fields.

ASTM A182 F316 /316L Socket Weld Flanges Pressure Rating Table

Table Il-2-2.2 Pressure-Temperature Ratings for Group 2.2 Materials
Nominal Designation		Forgings		Castings		Plates
16Cr-12Ni-2Mo		A182 Gr.F316(1)		A351 Gr.CF3M(2)		A240 Gr.316(1)
Working Pressures by Classes,psig
Class
Temp.,F	150	300	400	600	900	1500	2500
-20 to 100	275	720	960	1440	2160	3600	6000
200	235	620	825	1240	1860	3095	5160
300	215	560	745	1120	1680	2795	4660
400	195	515	685	1.025	1540	2570	4280
500	170	480	635	955	1435	2390	3980
600	140	450	600	900	1355	2255	3760
650	125	440	590	885	1325	2210	3680
700	110	435	580	870	1305	2170	3620
750	95	425	570	855	1280	2135	3560
800	80	420	565	845	1265	2110	3520
850	65	420	555	835	1255	2090	3480
900	50	415	555	830	1245	2075	3460
950	35	385	515	775	1160	1930	3220
1000	20	365	485	725	1090	1820	3030
1050		360	480	720	1080	1800	3000
1100		305	405	610	915	1525	2545
1150		235	315	475	710	1185	1970
1200		185	245	370	555	925	1545
1250		145	195	295	440	735	1230
1300		115	155	235	350	585	970
1350		95	130	190	290	480	800
1400		75	100	150	225	380	630
1450		60	80	115	175	290	485
1500		40	55	85	125	205	345

Applications of A182 F316/316L Socket Weld Flanges

✔ Oil & Gas Industry – Offshore platforms, pipelines
✔ Chemical & Petrochemical Plants – Corrosive fluid handling
✔ Marine & Shipbuilding – Saltwater-resistant piping
✔ Power Generation – High-pressure steam lines
✔ Food & Beverage Industry – Hygienic process piping
✔ Pharmaceuticals – Sterile and clean piping systems

Exported Countries

We Export ASTM A182 F316/316L socket weld flange to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan,  Europe, Africa, Asia, North America, South America, Middle East.etc

June 9, 2025