ASTM A105 Flange

ASTM A105 is a globally recognized standard specification for forged carbon steel piping components, including flanges, fittings, valves, and similar parts. These components are engineered to endure high-temperature and high-pressure environments. The ASTM A105 Flange, in particular, is a pivotal product used across various industries for creating robust and reliable piping systems. Known for its exceptional mechanical properties, durability, and corrosion resistance, the A105 Flange ensures operational efficiency and safety in critical applications.

Key Features of ASTM A105 Flange

1. Material Composition: ASTM A105 flanges are manufactured using forged carbon steel. The material typically contains carbon, manganese, phosphorus, sulfur, and silicon, contributing to its excellent mechanical properties and weldability.
2. Versatility: A105 flanges are suitable for various applications, including high-pressure, high-temperature, and ambient-temperature environments.
3. Corrosion Resistance: While primarily composed of carbon steel, these flanges exhibit moderate corrosion resistance and are often coated or treated to enhance longevity in harsh conditions.
4. Strength and Durability: Forged construction ensures high tensile and yield strength, making the flange ideal for demanding applications.
5. Customizability: ASTM A105 flanges are available in various sizes, pressure ratings, and face types, catering to the specific needs of industries.

Types of ASTM A105 Flanges

ASTM A105 flanges are available in numerous types to meet different piping requirements. Below are the most common types:

• ASTM A105 Weld Neck Flange
• ASTM A105 Slip-On Flange
• ASTM A105 Blind Flange
• ASTM A105 Socket Weld Flange
• ASTM A105 Threaded Flange
• ASTM A105 Lap Joint Flange

ASTM A105 Flange Size

Class 150 Forged Flanges

Nom. Pipe Size	O	T	TJ	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	r	D	Thr
½	3.5	0.38	0.44	1.38	1.19	4-0.62	2.38	0.88	0.62	0.9	0.84	0.56	1.81	0.62	0.12	0.38	0.62
¾	3.88	0.44	0.5	1.69	1.5	4-0.62	2.75	1.09	0.82	1.11	1.05	0.56	2	0.62	0.12	0.44	0.62
1	4.25	0.5	0.56	2	1.94	4-0.62	3.12	1.36	1.05	1.38	1.32	0.62	2.12	0.69	0.12	0.5	0.69
1¼	4.62	0.56	0.62	2.5	2.31	4-0.62	3.5	1.7	1.38	1.72	1.66	0.75	2.19	0.81	0.19	0.56	0.81
1½	5	0.62	0.69	2.88	2.56	4-0.62	3.88	1.95	1.61	1.97	1.9	0.81	2.38	0.88	0.25	0.62	0.88
2	6	0.69	0.75	3.62	3.06	4-0.75	4.75	2.44	2.07	2.46	2.38	0.94	2.44	1	0.31	0.69	1
2½	7	0.81	0.88	4.12	3.56	4-0.75	5.5	2.94	2.47	2.97	2.88	1.06	2.69	1.12	0.31	0.75	1.12
3	7.5	0.88	0.94	5	4.25	4-0.75	6	3.57	3.07	3.6	3.5	1.12	2.69	1.19	0.38	0.81	1.19
3½	8.5	0.88	0.94	5.5	4.81	8-0.75	7	4.07	3.55	4.1	4	1.19	2.75	1.25	0.38	0.88	1.25
4	9	0.88	0.94	6.19	5.31	8-0.75	7.5	4.57	4.03	4.6	4.5	1.25	2.94	1.31	0.44	0.94	1.31
5	10	0.88	0.94	7.31	6.44	8-0.88	8.5	5.66	5.05	5.69	5.56	1.38	3.44	1.44	0.44	0.94	1.44
6	11	0.94	1	8.5	7.56	8-0.88	9.5	6.72	6.07	6.75	6.63	1.5	3.44	1.56	0.5	1.06	1.56
8	13.5	1.06	1.12	10.62	9.69	8-0.88	11.75	8.72	7.98	8.75	8.63	1.69	3.94	1.75	0.5	1.25	1.75
10	16	1.12	1.19	12.75	12	12-1.00	14.25	10.88	10.02	10.92	10.75	1.88	3.94	1.94	0.5	1.31	1.94
12	19	1.19	1.25	15	14.38	12-1.00	17	12.88	12	12.92	12.75	2.12	4.44	2.19	0.5	1.56	2.19
14	21	1.31	1.38	16.25	15.75	12-1.12	18.75	14.14	13.25	14.18	14	2.19	4.94	3.12	0.5	1.63	2.25
16	23.5	1.38	1.44	18.5	18	16-1.12	21.25	16.16	15.25	16.19	16	2.44	4.94	3.44	0.5	1.75	2.5
18	25	1.5	1.56	21	19.88	16-1.25	22.75	18.18	17.25	18.2	18	2.62	5.44	3.81	0.5	1.94	2.69
20	27.5	1.62	1.69	23	22	20-1.25	25	20.2	19.25	20.25	20	2.81	5.62	4.06	0.5	2.13	2.88
22	29.5	1.75	1.81	25.25	24.25	20-1.38	27.25	22.22	21.25	22.25	22	3.07	5.82	4.25	0.5	2.38	3.13
24	32	1.81	1.88	27.25	26.12	20-1.38	29.5	24.25	23.25	24.25	24	3.19	5.94	4.38	0.5	2.5	3.25

Class 600 Forged Flanges

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	r	C	D	Thr
½	3.75	0.56	1.38	1.5	4-0.63	2.62	0.88		0.9	0.84	0.88	2.06	0.88	0.12	0.93	0.38	0.62
¾	4.62	0.62	1.69	1.88	4-0.75	3.25	1.09		1.11	1.05	1	2.25	1	0.12	1.14	0.44	0.62
1	4.88	0.69	2	2.12	4-0.75	3.5	1.36		1.38	1.32	1.06	2.44	1.06	0.12	1.41	0.5	0.69
1¼	5.25	0.81	2.5	2.5	4-0.75	3.88	1.7		1.72	1.66	1.12	2.62	1.12	0.19	1.75	0.56	0.81
1½	6.12	0.88	2.88	2.75	4-0.88	4.5	1.95		1.97	1.9	1.25	2.75	1.25	0.25	1.99	0.62	0.88
2	6.5	1	3.62	3.31	8-0.75	5	2.44		2.46	2.38	1.44	2.88	1.44	0.31	2.5	0.69	1.12
2½	7.5	1.12	4.12	3.94	8-0.88	5.88	2.94		2.97	2.88	1.62	3.12	1.62	0.31	3	0.75	1.25
3	8.25	1.25	5	4.62	8-0.88	6.62	3.57		3.6	3.5	1.81	3.25	1.81	0.38	3.63	0.81	1.38
3½	9	1.38	5.5	5.25	8-1.00	7.25	4.07		4.1	4	1.94	3.38	1.94	0.38	4.13	….	1.56
4	10.75	1.5	6.19	6	8-1.00	8.5	4.57		4.6	4.5	2.12	4	2.12	0.44	4.63	….	1.62
5	13	1.75	7.31	7.44	8-1.12	10.5	5.66		5.69	5.56	2.38	4.5	2.38	0.44	5.69	….	1.88
6	14	1.88	8.5	8.75	12-1.12	11.5	6.72		6.75	6.63	2.62	4.62	2.62	0.5	6.75	….	2
8	16.5	2.19	10.62	10.75	12-1.25	13.75	8.72		8.75	8.63	3	5.25	3	0.5	8.75	….	2.25
10	20	2.5	12.75	13.5	16-1.38	17	10.88		10.92	10.75	3.38	6	4.38	0.5	10.88	….	2.56
12	22	2.62	15	15.75	20-1.38	19.25	12.88		12.92	12.75	3.62	6.12	4.62	0.5	12.94	….	2.75
14	23.75	2.75	16.25	17	20-1.50	20.75	14.14		14.18	14	3.69	6.5	5	0.5	14.19	….	2.88
16	27	3	18.5	19.5	20-1.63	23.75	16.16		16.19	16	4.19	7	5.5	0.5	16.19	….	3.06
18	29.25	3.25	21	21.5	20-1.75	25.75	18.18		18.2	18	4.62	7.25	6	0.5	18.19	….	3.12
20	32	3.5	23	24	24-1.75	28.5	20.2		20.25	20	5	7.5	6.5	0.5	20.19	….	3.25
22	34.25	3.75	25.25	26.25	24-1.75	30.63	22.22		22.25	22	5.25	7.75	6.88	0.5	….	….	—
24	37	4	27.25	28.25	24-2.00	33	24.25		24.25	24	5.5	8	7.25	0.5	24.19	….	3.62

Class 300 Forged Flanges

Nom. Pipe Size	O	T	TJ	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	r	C	D	Thr
½	3.75	0.5	0.56	1.38	1.5	4-0.63	2.62	0.88	0.62	0.9	0.84	0.81	2	0.88	0.12	0.93	0.38	0.62
¾	4.62	0.56	0.62	1.69	1.88	4-0.75	3.25	1.09	0.82	1.11	1.05	0.94	2.19	1	0.12	1.14	0.44	0.62
1	4.88	0.62	0.69	2	2.12	4-0.75	3.5	1.36	1.05	1.38	1.32	1	2.38	1.06	0.12	1.41	0.5	0.69
1¼	5.25	0.69	0.75	2.5	2.5	4-0.75	3.88	1.7	1.38	1.72	1.66	1	2.5	1.06	0.19	1.75	0.56	0.81
1½	6.12	0.75	0.81	2.88	2.75	4-0.88	4.5	1.95	1.61	1.97	1.9	1.13	2.63	1.19	0.25	1.98	0.62	0.88
2	6.5	0.81	0.88	3.62	3.31	8-0.75	5	2.44	2.07	2.46	2.38	1.25	2.69	1.31	0.31	2.5	0.69	1.12
2½	7.5	0.94	1	4.12	3.94	8-0.88	5.88	2.94	2.47	2.97	2.88	1.44	2.94	1.5	0.31	3	0.75	1.25
3	8.25	1.06	1.12	5	4.62	8-0.88	6.62	3.57	3.07	3.6	3.5	1.63	3.06	1.69	0.38	3.63	0.81	1.25
3½	9	1.12	1.19	5.5	5.25	8-0.88	7.25	4.07	3.55	4.1	4	1.69	3.13	1.75	0.38	4.13	….	1.44
4	10	1.19	1.25	6.19	5.75	8-0.88	7.88	4.57	4.03	4.6	4.5	1.82	3.32	1.88	0.44	4.63	….	1.44
5	11	1.31	1.38	7.31	7	8-0.88	9.25	5.66	5.05	5.69	5.56	1.94	3.82	2	0.44	5.69	….	1.69
6	12.5	1.38	1.44	8.5	8.12	12-0.88	10.62	6.72	6.07	6.75	6.63	2	3.82	2.06	0.5	6.75	….	1.81
8	15	1.56	1.62	10.62	10.25	12-1.00	13	8.72	7.98	8.75	8.63	2.38	4.32	2.44	0.5	8.75	….	2
10	17.5	1.81	1.88	12.75	12.62	16-1.12	15.25	10.88	10.02	10.92	10.75	2.56	4.56	3.75	0.5	10.88	….	2.19
12	20.5	1.94	2	15	14.75	16-1.25	17.75	12.88	12	12.92	12.75	2.82	5.06	4	0.5	12.94	….	2.38
14	23	2.06	2.12	16.25	16.75	20-1.25	20.25	14.14	13.25	14.18	14	2.94	5.56	4.38	0.5	14.19	….	2.5
16	25.5	2.19	2.25	18.5	19	20-1.38	22.5	16.16	15.25	16.19	16	3.19	5.69	4.75	0.5	16.19	….	2.69
18	28	2.31	2.38	21	21	24-1.38	24.75	18.18	17.25	18.2	18	3.44	6.19	5.12	0.5	18.19	….	2.75
20	30.5	2.44	2.5	23	23.12	24-1.38	27	20.2	19.25	20.25	20	3.69	6.32	5.5	0.5	20.19	….	2.88
22	33	2.57	2.63	25.25	25.25	24-1.63	29.25	22.22	21.25	22.25	22	3.93	6.43	5.75	0.5	22.19	….	3.13
24	36	2.69	2.75	27.25	27.62	24-1.63	32	24.25	23.25	24.25	24	4.13	6.56	6	0.5	24.19	….	3.25

Class 900 Forged Flanges

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	r	C	Thr
Sizes 1/2″ through 2 1/2″ are identical to class 1500.
3	9.5	1.5	5	5	8-1.00	7.5	3.57		3.6	3.5	2.12	4	2.12	0.38	3.63	1.62
4	11.5	1.75	6.19	6.25	8-1.25	9.25	4.57		4.6	4.5	2.75	4.5	2.75	0.44	4.63	1.88
5	13.75	2	7.31	7.5	8-1.38	11	5.66		5.69	5.56	3.12	5	3.12	0.44	5.69	2.12
6	15	2.19	8.5	9.25	12-1.25	12.5	6.72		6.75	6.63	3.38	5.5	3.38	0.5	6.75	2.25
8	18.5	2.5	10.63	11.75	12-1.50	15.5	8.72		8.75	8.63	4	6.38	4.5	0.5	8.75	2.5
10	21.5	2.75	12.75	14.5	16-1.50	18.5	10.88		10.92	10.75	4.25	7.25	5	0.5	10.88	2.81
12	24	3.12	15	16.5	20-1.50	21	12.88		12.92	12.75	4.63	7.88	5.62	0.5	12.94	3
14	25.25	3.38	16.25	17.75	20-1.63	22	14.14		14.18	14	5.12	8.38	6.12	0.5	14.19	3.25
16	27.75	3.5	18.5	20	20-1.75	24.25	16.16		16.19	16	5.25	8.5	6.5	0.5	16.19	3.38
18	31	4	21	22.25	20-2.00	27	18.18		18.2	18	6	9	7.5	0.5	18.19	3.5
20	33.75	4.25	23	24.5	20-2.13	29.5	20.2		20.25	20	6.25	9.75	8.25	0.5	20.19	3.62
24	41	5.5	27.25	29.5	20-2.63	35.5	24.25		24.25	24	8	11.5	10.5	0.5	24.19	4

Class 400 Forged Flanges

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	r	C	D	Thr
½	3.75	0.56	1.38	1.5	4-0.63	2.62	0.88		0.9	0.84	0.88	2.06	0.88	0.12	0.93	0.38	0.62
¾	4.62	0.62	1.69	1.88	4-0.75	3.25	1.09		1.11	1.05	1	2.25	1	0.12	1.14	0.44	0.62
1	4.88	0.69	2	2.12	4-.075	3.5	1.36		1.38	1.32	1.06	2.44	1.06	0.12	1.41	0.5	0.69
1¼	5.25	0.81	2.5	2.5	4-0.75	3.88	1.7		1.72	1.66	1.12	2.62	1.12	0.19	1.75	0.56	0.81
1½	6.12	0.88	2.88	2.75	4-0.88	4.5	1.95		1.97	1.9	1.25	2.75	1.25	0.25	1.99	0.62	0.88
2	6.5	1	3.62	3.31	8-0.75	5	2.44		2.46	2.38	1.44	2.88	1.44	0.31	2.5	0.69	1.12
2½	7.5	1.12	4.12	3.94	8-0.88	5.88	2.94		2.97	2.88	1.62	3.12	1.62	0.31	3	0.75	1.25
3	8.25	1.25	5	4.62	8-0.88	6.62	3.57		3.6	3.5	1.81	3.25	1.81	0.38	3.63	0.81	1.38
3½	9	1.38	5.5	5.25	8-1.00	7.25	4.07		4.1	4	1.94	3.38	1.94	0.38	4.13	….	1.56
4	10	1.38	6.19	5.75	8-1.00	7.88	4.57		4.6	4.5	2	3.5	2	0.44	4.63	….	1.44
5	11	1.5	7.31	7	8-1.00	9.25	5.66		5.69	5.56	2.12	4	2.12	0.44	5.69	….	1.69
6	12.5	1.62	8.5	8.12	12-1.00	10.62	6.72		6.75	6.63	2.25	4.06	2.25	0.5	6.75	….	1.81
8	15	1.88	10.62	10.25	12-1.12	13	8.72		8.75	8.63	2.69	4.62	2.69	0.5	8.75	….	2
10	17.5	2.12	12.75	12.62	16-1.25	15.25	10.88		10.92	10.75	2.88	4.88	4	0.5	10.88	….	2.19
12	20.5	2.25	15	14.75	16-1.38	17.75	12.88		12.92	12.75	3.12	5.38	4.25	0.5	12.94	….	2.38
14	23	2.38	16.25	16.75	20-1.38	20.25	14.14		14.18	14	3.31	5.88	4.62	0.5	14.19	….	2.5
16	25.5	2.5	18.5	19	20-1.50	22.5	16.16		16.19	16	3.69	6	5	0.5	16.19	….	2.69
18	28	2.62	21	21	24-1.50	24.75	18.18		18.2	18	3.88	6.5	5.38	0.5	18.19	….	2.75
20	30.5	2.75	23	23.12	24-1.62	27	20.2		20.25	20	4	6.62	5.75	0.5	20.19	….	2.88
22	33	2.88	25.25	25.25	24-1.75	29.25	22.22		22.25	22	4.25	6.75	6	0.5	….	….	—
24	36	3	27.25	27.62	24-1.88	32	24.25		24.25	24	4.5	6.88	6.25	0.5	24.19	….	3.25

Class 1500 Forged Flange

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B	B2b	B3	H	L	L2	L3c	r	C	D	Thr
½	4.75	0.88	1.38	1.5	4-0.88	3.25	0.88		0.9	0.84	1.25	2.38	1.25	0.12	0.93	0.38	0.88
¾	5.12	1	1.69	1.75	4-0.88	3.5	1.09		1.11	1.05	1.38	2.75	1.38	0.12	1.14	0.44	1
1	5.88	1.12	2	2.06	4-1.00	4	1.36		1.38	1.32	1.62	2.88	1.62	0.12	1.41	0.5	1.12
1¼	6.25	1.12	2.5	2.5	4-1.00	4.38	1.7		1.72	1.66	1.62	2.88	1.62	0.19	1.75	0.56	1.19
1½	7	1.25	2.88	2.75	4-1.12	4.88	1.95		1.97	1.9	1.75	3.25	1.75	0.25	1.99	0.62	1.25
2	8.5	1.5	3.63	4.12	8-1.00	6.5	2.44		2.46	2.38	2.25	4	2.25	0.31	2.5	0.69	1.5
2½	9.62	1.62	4.13	4.88	8-1.12	7.5	2.94		2.97	2.88	2.5	4.12	2.5	0.31	3	0.75	1.88
3	10.5	1.88	5	5.25	8-1.25	8	….		3.6	3.5	….	4.62	2.88	0.38	….	….	….
4	12.25	2.12	6.19	6.38	8-1.38	9.5	….		4.6	4.5	….	4.88	3.56	0.44	….	….	….
5	14.75	2.88	7.31	7.75	8-1.63	11.5	….		5.69	5.56	….	6.12	4.12	0.44	….	….	….
6	15.5	3.25	8.5	9	12-1.50	12.5	….		6.75	6.63	….	6.75	4.69	0.5	….	….	….
8	19	3.62	10.63	11.5	12-1.75	15.5	….		8.75	8.63	….	8.38	5.62	0.5	….	….	….
10	23	4.25	12.75	14.5	12-2.00	19	….		10.92	10.75	….	10	7	0.5	….	….	….
12	26.5	4.88	15	17.75	16-2.12	22.5	….		12.92	12.75	….	11.12	8.62	0.5	….	….	….
14	29.5	5.25	16.25	19.5	16-2.38	25	….		14.18	14	….	11.75	9.5	0.5	….	….	….
16	32.5	5.75	18.5	21.75	16-2.63	27.75	….		16.19	16	….	12.25	10.25	0.5	….	….	….
18	36	6.38	21	23.5	16-2.88	30.5	….		18.2	18	….	12.88	10.88	0.5	….	….	….
20	38.75	7	23	25.25	16-3.12	32.75	….		20.25	20	….	14	11.5	0.5	….	….	….
24	46	8	27.25	30	16-3.63	39	….		24.25	24	….	16	13	0.5	….	….	….

Class 2500 Forged Flange

Nom. Pipe Size	O	T	R	X	#/Dia of Holesa	Bolt Circle Dia	B2b	B3	H	L	L2	L3	r	C	Thr
½	5.25	1.19	1.38	1.69	4-0.88	3.5		0.9	0.84	1.56	2.88	1.56	0.12	0.93	1.12
¾	5.5	1.25	1.69	2	4-0.88	3.75		1.11	1.05	1.69	3.12	1.69	0.12	1.14	1.25
1	6.25	1.38	2	2.25	4-1.00	4.25		1.38	1.32	1.88	3.5	1.88	0.12	1.41	1.38
1¼	7.25	1.5	2.5	2.88	4-1.12	5.13		1.72	1.66	2.06	3.75	2.06	0.19	1.75	1.5
1½	8	1.75	2.88	3.12	4-1.25	5.75		1.97	1.9	2.38	4.38	2.38	0.25	1.99	1.75
2	9.25	2	3.63	3.75	8-1.12	6.75		2.46	2.38	2.75	5	2.75	0.31	2.5	2
2½	10.5	2.25	4.13	4.5	8-1.25	7.75		2.97	2.88	3.12	5.62	3.12	0.31	3	2.25
3	12	2.62	5	5.25	8-1.38	9		3.6	3.5	….	6.62	3.62	0.38	….	….
4	14	3	6.19	6.5	8-1.63	10.75		4.6	4.5	….	7.5	4.25	0.44	….	….
5	16.5	3.62	7.31	8	8-1.88	12.75		5.69	5.56	….	9	5.12	0.44	….	….
6	19	4.25	8.5	9.25	8-2.12	14.5		6.75	6.63	….	10.75	6	0.5	….	….
8	21.75	5	10.63	12	12-2.12	17.25		8.75	8.63	….	12.5	7	0.5	….	….
10	26.5	6.5	12.75	14.75	12-2.63	21.25		10.92	10.75	….	16.5	9	0.5	….	….
12	30	7.25	15	17.38	12-2.88	24.38		12.92	12.75	….	18.25	10	0.5	….	….

Applications of ASTM A105 Flange

The versatile ASTM A105 flange is widely utilized in various industries due to its durability and performance. Key applications include:

1. Oil and Gas: A105 flanges are crucial in pipelines, refineries, and offshore platforms, handling high-pressure and high-temperature fluids.
2. Petrochemical: These flanges ensure secure connections in complex piping systems transporting corrosive and hazardous chemicals.
3. Power Generation: Used in power plants, these flanges can withstand extreme thermal and mechanical stresses in steam and gas turbines.
4. Chemical Processing: In chemical industries, ASTM A105 flanges are used for pipelines carrying volatile and reactive substances.
5. Shipbuilding: Ensuring reliable connections in marine environments, these flanges are used in ship pipelines and hydraulic systems.
6. Water Treatment: A105 flanges play a critical role in water treatment plants by connecting pipes in high-pressure systems.

Advantages of ASTM A105 Flange

1. High-Temperature Resistance: These flanges perform efficiently under extreme temperatures, ensuring safe and reliable operations.
2. Cost-Effectiveness: Carbon steel flanges offer a balance between affordability and performance, making them a preferred choice for many industries.
3. Enhanced Strength: The forged construction enhances mechanical strength, ensuring durability under high pressure.
4. Wide Availability: ASTM A105 flanges are readily available in various sizes, pressure ratings, and specifications, ensuring prompt delivery for industrial needs.
5. Ease of Installation and Maintenance: These flanges facilitate easy installation and provide straightforward access for inspection or replacement.

ASTM A105 Flange Specification

Chemical Composition

Element	Composition (%)
Carbon (C)	0.35 max
Manganese (Mn)	0.60–1.05
Phosphorus (P)	0.035 max
Sulfur (S)	0.040 max
Silicon (Si)	0.10–0.35
Copper (Cu)	0.40 max
Nickel (Ni)	0.40 max
Chromium (Cr)	0.30 max
Molybdenum (Mo)	0.12 max
Vanadium (V)	0.08 max

Mechanical Properties

Property	Requirement
Tensile Strength	70,000 psi (485 MPa) min
Yield Strength	36,000 psi (250 MPa) min
Elongation	30% min
Reduction of Area	30% min
Hardness (HBW)	187 max

Pressure Ratings of ASTM A105 Flange

ASTM A105 flanges are manufactured in various pressure classes to accommodate different system requirements. Common pressure ratings include:

1. Class 150: Suitable for low-pressure systems and general-purpose applications.
2. Class 300: Designed for moderate-pressure systems with higher safety requirements.
3. Class 600: Capable of handling high-pressure and high-temperature environments.
4. Class 900, 1500, and 2500: Used in extreme-pressure applications, such as oil and gas pipelines and power plants.

Standards and Certifications

ASTM A105 flanges comply with international standards and certifications, ensuring quality and reliability. Key standards include:

1. ASME B16.5: Specifies dimensions, pressure ratings, and tolerances for pipe flanges and flanged fittings.
2. ASME B16.47: Covers large-diameter steel flanges for pipelines and pressure vessels.
3. API 605: Defines flanges used in the oil and gas industry.

Manufacturing Process of ASTM A105 Flange

1. Forging: The flange begins as a carbon steel billet, heated to a high temperature, and shaped into the desired form.
2. Machining: The forged piece undergoes precision machining to meet dimensional standards and specifications.
3. Heat Treatment: Normalizing or quenching and tempering processes enhance the flange’s mechanical properties.
4. Testing: Rigorous testing, including hydrostatic, ultrasonic, and dimensional inspections, ensures the flange meets quality standards.

Maintenance and Inspection

To ensure the longevity and performance of ASTM A105 flanges, regular maintenance and inspection are vital:

1. Visual Inspection: Check for cracks, corrosion, or wear and tear.
2. Dimensional Checks: Verify dimensions to ensure compatibility and fit.
3. Pressure Testing: Conduct hydrostatic or pneumatic tests to confirm pressure-holding capacity.
4. Surface Coating: Apply anti-corrosion coatings or paint for added protection in corrosive environments.

Conclusion

ASTM A105 flanges are indispensable in constructing reliable and efficient piping systems across industries. With their robust construction, excellent performance under high-pressure and high-temperature conditions, and wide-ranging applications, these flanges have earned their place as a top choice for engineers and designers. Investing in high-quality ASTM A105 flanges from reputable manufacturers like Emirerri Steel ensures optimal performance, safety, and durability in your operations. Whether for the oil and gas sector, power plants, or chemical processing, these flanges deliver exceptional value and reliability.