SS304 Blind Flange

zhao77jie — Fri, 29 Aug 2025 02:00:00 +0000

On August 12, 2025, our long-standing domestic client placed an order for SS304 blind flange. Having collaborated with us on multiple occasions, this customer consistently values our product quality and delivery efficiency. For this order, we strictly adhered to ASME/ASTM standards throughout production and inspection, ensuring each flange met project specifications in dimensions, performance, and surface treatment.

To facilitate the client’s project progress, we optimized our production schedule and ultimately delivered the order one week ahead of the contractual deadline, earning high praise from the client once again.

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Product Inspection

We provide customers with Mill Test Certificates (MTC) for flanges to ensure every product meets international standards and client specifications. The MTC details chemical composition, mechanical properties, heat treatment conditions, dimensional tolerances, and relevant inspection results. By delivering comprehensive certification documentation, customers gain clear insight into flange materials and performance while receiving robust support for project quality management and third-party audits. This exemplifies our unwavering commitment to quality-first, transparent, and traceable service.

Sealing Face	RF, FF, FTJ
Size Range	1/2” – 48” / DN15 – DN1200
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
Standard	ASME / ANSI B16.5, ASME B16.47 Series A/B
Carbon Steel	ASTM A105 / A105N
Low Temp Carbon Steel	ASTM A350 LF2/LF3
Pipeline Steel	ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel	ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel	ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel	ASTM A182 F51, F53, F44

ASTM A182 F304 Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F304	MIN						8.0	18.0
ASTM A182 F304	MAX	0.08	2.00	0.045	0.030	1.00	11.0	20.0		0.10
ASTM A182 F304H	MIN	0.04					8.00	18.00
ASTM A182 F304H	MAX	0.10	2.00	0.045	0.030	1.00	11.00	20.00

ASTM A182 F304 Flange Mechanical Property

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %
ASTM A182 F304	515 min	205 min	30 min	50 min
ASTM A182 F304L	485 min	170 min	30 min	50 min

Nominal Pipe Size		A	C	G	H	I	J	Weight
inch	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.3	95.2	14.2	35.1	4	15.7	66.55	0.64
3/4	26.7	117.3	15.7	42.9	4	19	82.5	1.11
1	33.4	123.9	17.5	50.8	4	19	88.9	1.39
11/4	42.2	133.3	19	63.5	4	19	98.5	1.79
11/2	48.3	155.4	20.6	73.15	4	22.3	114.3	2.66
2	60.3	165. 1	22.3	91.9	8	19. 10	127	3.18
21/2	73.0	190.5	25.4	104.6	8	22.3	1.493	4.85
3	88.9	209.5	28.4	127	8	22.3	168.1	6.81
31/2	101.6	228.6	30.2	139.7	8	22.3	184.1	8.71
4	114.3	254	31.7	157.2	8	22.3	200.1	11.5
5	141.3	279.4	35	185.7	8	22.3	234.9	15.6
6	168.3	317.5	36.5	215.9	12	22.3	269.7	20.9
8	219. 1	381	1.620 41.10	269.7	12	25.4	330.2	34.3
10	273.0	444.5	47.7	323.9	16	28.4	387.3	53.3
12	323.8	520.7	50.8	381	16	31.7	450.8	78.8
14	355.6	584.2	53.8	412.8	20	31.7	514.3	105
16	406.4	647.7	57.15	469.9	20	35	571.5	137
18	457.2	711.2	60.45	533.4	24	35	628.6	175
20	508.0	774.7	63.5	584.2	24	35	685.8	221
24	609.6	914.4	69.85	692.2	24	41. 10	812.8	339

Different Face Types

Similar to other flanges, blind flanges can have different face types to match the mating flange and gasket:

Raised Face (RF): The most common type, featuring a raised ring around the bore to concentrate sealing pressure.

Flat Face (FF): Has a flat sealing surface, typically used with flat face mating flanges, often in low-pressure applications or with fragile flanges.

Ring Joint (RTJ): Features a groove to accommodate a metal ring gasket, designed for high-pressure and high-temperature service.

Characteristic of 304 Stainless Steel

304 stainless steel is one of the most widely used austenitic stainless steels. Its standard composition contains approximately 18% chromium (Cr) and 8% nickel (Ni), hence it is often referred to as “18-8” stainless steel. This material is highly favored for its outstanding comprehensive properties.

Superior Corrosion Resistance: The chromium in 304 stainless steel forms a dense oxide film on its surface, effectively resisting corrosion from air, water, weak acids, and weak alkalis. This makes it highly suitable for long-term use in general corrosive environments.

Excellent Workability: It possesses good plasticity, making it easy to process through stamping, bending, welding, and other methods. It can be readily formed into products of various shapes and specifications.

Strong Strength and Toughness: While not a high-strength steel, 304 stainless steel possesses sufficient yield strength and tensile strength to meet the demands of most engineering applications.

Hygienic and Non-Toxic: Its smooth surface facilitates easy cleaning and prevents chemical reactions with media, making it widely used in industries with stringent hygiene requirements, such as food processing and pharmaceuticals.

Carbon steel: economical and practical, suitable for common working conditions (such as water and oil).

Stainless steel (304/316): strong corrosion resistance, suitable for chemical and marine environments.

Alloy steel: resistant to high temperature and high pressure, used in power and petrochemical industries.

Applications:

Oil & Gas pipelines

Chemical and Petrochemical plants

Food & Pharmaceutical industry

Water Treatment systems

Any industrial piping requiring temporary or permanent closure

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