ANSI B16.5 Class 300 Slip On Flanges Order

On March 11, 2025, we received an inquiry from a long-standing Chinese client regarding ANSI B16.5 Class 300 slip on flanges. We promptly responded to the client. Due to our long-term partnership and the client’s trust in us, they placed an order immediately after we completed the quotation.

Purchase Information:

Product: Slip On Flange

Material: ASTM A182 F304L

Production Standard: ANSI B16.5

NPS: 10″

Pressure Rating: Class 300

The customer required clean, undamaged surfaces without dents or scratches. Our company strictly adheres to these standards. During production, we not only select premium raw materials compliant with international standards but also employ advanced processing and inspection techniques to ensure the appearance and dimensional accuracy of every product. Before shipment, each finished product undergoes individual inspection and is carefully packaged to prevent damage during transit. This guarantees that the delivered products feature smooth, undamaged surfaces and consistently reliable quality.

Introduction of slip on flange

Slip on flanges are the most widely used and common type of flange connection in industrial piping systems. Their name originates from the welding method employed—the flange and pipe are joined via a fillet weld, with the flange face remaining parallel to the pipe during welding, hence the term “slip-on.”

How Slip On Flanges Work

The operational principle of a slip-on flange is rooted in its dual-welding mechanism. The flange is first slipped onto the pipe, allowing for initial alignment adjustments. Two fillet welds are then applied: one at the hub-to-pipe interface on the outside and another on the inside where the pipe meets the flange face. This creates a strong, leak-proof connection capable of withstanding system pressure and external loads. The design of the ANSI B16.5 Class 300 slip on flanges ensures sufficient structural integrity for its pressure class, distributing stress effectively through the welded joints and the flange body itself.

Class 300 Slip On Flanges Dimension

ANSI B16.5 slip on Flanges include six classes: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500.

ANSI B16.5 Class 300 Slip On Flanges Dimension:

 

Nominal Pipe Size		A	B	C	D	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.3	95.2	22.4	14.2	22.4	38.1	35.1	4	15.7	66.55	0.64
3/4	26.7		27.7	15.7	25.4	47.7	42.9	4	19.1	82.5	1. 12
1	33.4	123.9	34.5	17.5	26.9	53.8	50.8	4	19.1	88.9	1.36
11/4	42.2	133.3	43.2	19	26.9	63.5	63.5	4	19.1	98.6	1.68
11/2	48.3	155.4	49.5	20.6	30.2	69.85	73.15	4	22.4	114.3	2.49
2	60.3	165.1	62	22.3	33.2	84	91.9	8	19.1	127	2.87
21/2	73	190.5	74.7	25.4	38.1	100	104.6	8	22.4	149.4	4.32
3	88.9	209.5	90.7	28.4	42.9	117.3	127	8	22.4	168.1	5.85
31/2	101.6	228.6	103.4	30.2	44.4	133.3	139.7	8	22.4	184.2	7.34
4	114.3	254	116.1	31.7	47.7	146	157.2	8	22.4	200.1	9.61
5	141.3	279.4	143.8	35	50.8	177.8	185.7	8	22.4	234.9	12.3
6	168.3	317.5	170.7	36.5	52.3	206.2	215.9	12	22.4	269.7	15.6
8	219. 1	381	221.5	41.1	61.9	260.3	269.7	12	25.4	330.2	24.2
10	273	444.5	276.3	47.7	66.55	320.5	323.9	16	28.4	387.3	34.1
12	323.8	520.7	327.1	50.8	73.15	374.6	381	16	31.7	450.8	49.8
14	355.6	584.2	359.1	53.8	76.2	425.4	412.8	20	31.7	514.4	69.9
16	406.4	647.7	410.5	57.15	82.5	482.6	469.9	20	35	571.5	88.1
18	457.2	711.2	461.8	60.45	88.9	533.4	533.4	24	35	628.7	109
20	508	774.7	513.1	63.5	95.2	587.2	584.2	24	35	685.8	134
24	609.6	914.4	616	69.85	106.4	701.5	692.2	24	41	812.8	201

If you wish to learn about the dimensions of other grades of slip-on flanges under the ANSI B16.5 standard, you can click the link below.

ANSI B16.5 Class 150 Slip On Flange Dimension

ANSI B16.5 Class 400 Slip On Flange Dimension

ANSI B16.5 Class 600 Slip On Flange Dimension

ANSI B16.5 Class 900 Slip On Flange Dimension

ANSI B16.5 Class 1500 Slip On Flange Dimension

ASTM A182 F304L Flanges Material

Chemical Properties

ASTM A182 F304L is an austenitic stainless steel forged material for flanges. Its core chemical composition features 18% chromium and 8% nickel, with carbon content controlled below 0.03% to achieve excellent intergranular corrosion resistance. This composition design enables the formation of a stable passivation film in corrosive environments, making it widely used in chemical and food industries.

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F304L	MIN						8.00	18.00
	MAX	0.03	2.00	0.045	0.030	1.00	13.00	20.00		0.10

Mechanical Properties

Regarding mechanical properties, the material standard specifies a minimum tensile strength of 485 MPa and a yield strength of 170 MPa at room temperature. These performance metrics are achieved through solution heat treatment, a process involving heating the material to high temperatures followed by rapid cooling. This results in a uniform austenitic microstructure, ensuring both high strength and good ductility across diverse service conditions.

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %
ASTM A182 F304L	485 min	170 min	30 min	50 min

ASTM A182 F304L Slip On Flanges Advantages

• Easy installation and alignment
• Reduced fabrication costs
• Excellent resistance to corrosion
• Reliable sealing performance
• Compatibility with international standards

Flange Facing & Manufacture

ANSI B16.5 Class 300 slip on flanges are produced with different facing types such as Raised Face (RF) and Ring Type Joint (RTJ). Advanced forging and machining techniques ensure tight tolerances and smooth sealing surfaces, enhancing operational safety and service life.

Global Applications

• Petrochemical Industry
• Natural Gas Transmission
• Power Generation
• Shipbuilding
• Offshore Engineering
• Pharmaceutical Industry
• Food Processing
• Water Treatment Systems

Additional Resources

Difference between Weld Neck Flange and Slip On Flange