ASME B16.5 Class 150 Weld Neck Flanges Order

In late January 2025, we received an order from a new foreign customer for SS316L Class 150 weld neck flanges. After receiving the order, our sales representative promptly responded. In early February, the customer placed the order with us.

Information：

Material Standard ：ASTM A182 F316L

Production Standard ：ASEM B16.5

Size ：1-1/2″

Pressure：Class 150

Sealing Surface Type ：Raised Face

What Is a Weld Neck Flange?

Weld neck flanges are commonly used and reliable connectors in pipeline systems. Their distinguishing feature is a long neck at the top. This long neck design evenly distributes pipeline pressure, reducing dangerous concentrations at the joint, making them ideal for high-temperature, high-pressure, or growing applications. They connect directly to the pipeline via groove welding, providing excellent sealing performance and the same fatigue resistance as other flange types. They are widely used in the petroleum, chemical, and power industries.

ASTM A182 F316L Material：

Chemical Composition：

ASTM A182 F316L stainless steel primarily contains chromium, nickel, and molybdenum as alloying elements. Its carbon content is controlled at a low level, which helps minimize carbide precipitation. The material also contains moderate amounts of manganese and silicon while limiting impurity elements such as phosphorus and sulfur. The addition of nitrogen further enhances the material’s corrosion resistance. This balanced composition ensures the material’s stability in corrosive environments.

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
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

 Mechanical Properties：

From a mechanical properties perspective, ASTM A182 F316L exhibits excellent overall performance. With a minimum tensile strength of 485 MPa and a yield strength of 170 MPa, this material demonstrates sufficient load-bearing capacity. Its elongation of no less than 30% indicates good plasticity and formability. Even in high-temperature environments, the material maintains stable mechanical properties, making it suitable for various industrial applications.

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

Class 150 Weld Neck Flanges Dimension：

The pressure ratings of the ASME B16.5 weld neck flanges include seven levels: 150#, 300#, 400#, 600#, 900#, 1500#, and 2500#.

Class 150 Weld Neck Flanges Dimension:

 

 

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	88.90	15.70	11.20	47.80	21.30	30.20	35.00	4	15.70	60.45	0.48
3/4	26.70	98.60	20.80	12.70	52.30	26.70	38.10	42.90	4	15.70	69.85	0.71
1	33.40	108.0	26.70	14.20	55.60	33.50	49.30	50.80	4	15.70	79.25	1.01
11/4	42.20	117.3	35.10	15.70	57.15	42.20	58.70	63.50	4	15.70	88.90	1.33
11/2	48.30	127.0	40.90	17.50	62.00	48.30	65.00	73.15	4	15.70	98.60	1.72
2	60.30	152.4	52.60	19.10	63.50	60.45	77.70	91.90	4	19.10	120.7	2.58
21/2	73.00	177.8	62.70	22.40	69.85	73. 15	90.4	104.6	4	19.10	139.7	4.11
3	88.90	190.5	78.00	23.90	69.85	88.90	108.0	127.0	4	19.10	152.4	4.92
31/2	101.6	215.9	90.20	23.90	71.40	101.6	122.2	139.7	8	19.10	177.8	6.08
4	114.3	228.6	102.40	23.90	76.20	114.3	134.9	157.2	8	19.10	190.5	6.84
5	141.3	254.0	128.3	23.90	88.90	141.2	163.6	185.7	8	22.40	215.9	8.56
6	168.3	279.4	154.2	25.40	88.90	168.4	192.0	215.9	8	22.40	241.3	10.6
8	219.1	342.9	202.7	28.40	101.6	219.2	246.1	269.7	8	22.40	298.5	17.6
10	273.0	406.4	254.5	30.20	101.6	273.0	304.8	323.8	12	25.40	362.0	24.0
12	323.8	482.6	304.8	31.75	114.3	323.8	365.3	381.0	12	25.40	431.8	36.5
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	48.4
16	406.4	596.9		36.60	127.0	406.4	475.2	469.9	16	28.40	539.8	60.6
18	457.2	635.0		39.60	139.7	457.2	505.0	533.4	16	31.75	577.9	68.3
20	508.0	698.5		42.90	144.5	508.0	558.8	584.2	20	31.75	635.0	84.5
24	609.6	812.8		47.80	152.4	609.6	663.4	692.1	20	35.10	749.3	115

Inspection of SS316L Class 150 Weld Neck Flanges:

• Outer Diameter:Verify overall outer diameter dimensions fall within tolerance limits.
• Bolt Hole Center Circle Diameter:Confirm bolt hole distribution and center circle diameter accuracy.
• Neck Diameter:Inspect neck outer and inner diameter dimensions for pipeline compatibility.
• Thickness: Measure whether the thickness of the flange body and neck complies with design and standard requirements.
• Sealing Surface:Examine surface finish and flatness of sealing face, ensuring no scratches or cracks.
• Welding Groove:Confirm groove angle and dimensions meet welding procedure specifications.

ASME B16.5 Class 150 Weld Neck Flanges Advantages:

✅Excellent corrosion resistance, suitable for acidic and marine environments.

✅Low carbon content enhances weldability and reduces intergranular corrosion risk.

✅Secure welded connections ensure reliable pressure-bearing capacity.

✅Standardized design facilitates installation and replacement.

✅Long service life with low maintenance costs.

SS316L Class 150 Weld Neck Flanges Application:

• Chemical Processing Industry
• Oil and Gas (Mild Environments)
• Pharmaceutical Industry
• Food and Beverage Processing
• Marine and Ship Equipment
• Water Treatment and Wastewater Treatment

Frequently Asked Questions:

What is the difference between 316 and 316L?

What is the difference between 904L and 316L?