Carbon Steel Pipe Flange

TYPE: Welding Neck, Slio-On, Socket Welding, Blind, Threaded，Lapped, Spectacle Blind Flange, Orifice Flanges. Material: A105, A105N, A350 LF2, SS 400, Q235, S235 JR. Size: 1/2"~ 144" (DN15-DN1500) Pressure: 150lb~2500lb Thickness: Sch5s/10s/40s/Std/60/80/xs/120/160/xxs. Flange Facing: RF, FF, RTJ, M&F, T&G. Standard: ASME B16.5/B16.36/B16.47/B16.48, AWWA C207, API 6A/605, AS 2129, BS 3293/4504, EN1092-1, JIS B2220. MS SP-44 Customization: OEM/ODM service Samples: Sample service available

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Product Description

Carbon Steel Pipe Flanges Manufacturer | Bulk Supply & Fast Global Delivery

At Xi'an QinSteel Trading Co., Ltd, we engineer carbon steel pipe flanges that set the benchmark for durability and precision. With GMP-certified facilities and over a decade of expertise, we deliver ASME, API, and EN-compliant solutions trusted in oil/gas, power plants, and water treatment systems worldwide. Our 10,000+ ton annual production capacity ensures bulk orders ship within 15 days – no compromises on quality or deadlines.

Why Choose Carbon Steel Pipe Flanges?

The products offer unmatched strength-to-cost ratios for high-pressure piping networks. Designed to withstand temperatures from -29°C to 425°C, they’re ideal for steam lines, refinery pipelines, and offshore platforms. Our flanges come in weld neck, slip-on, threaded, and blind types, with sizes spanning ½” to 144” and pressure ratings up to Class 2500.

Material Specifications

STANDARD	TYPE	SIZE	PRESSURE
ASME B16.5	WN, SO, SW, BLD, THREADED, LP	1/2" ~ 24"	CLASS 150 ~ 2500
ASME B16.36	WN, SO, THREADED	1/2" ~ 24"	CLASS 300LB ~ 2500
ASME B16.47	WN BLD	26" ~ 60"	CLASS 75 ~ 900
ASME B16.48	SPECTACLE BLANKS, SPADES, RING SPACERS	1/2" ~ 24"	CLASS 150 ~ 2500
AWWA C207	STEEL RING, BLD, STEEL HUB	4" ~ 96"	86 ~ 275 PSI
API 6A	WN, BLD, THREADED, INTEGRAL, TEST	2-1/16" ~ 20-3/4"	13.8 MPa ~ 138.0 MPa
API 605	WN	26" ~ 60"	CLASS 150 ~ 900
SANS 1123	WN, PLATE, SCREWED, SO, LOOSE, BLANK, INTEGRAL	DN 10 ~ 3600	250 ~ 4000 kPa
AS 2129	BLD, PLATE, BOSS, WN	DN15 ~ 1800	TABLE A ~ TABLE T
BS 3293	SO, WN	26" ~ 48"	CLASS 150 ~ 600
BS 4504	PLATE, LOOSE, BLANK, WN, SO, THREADED, WO PLATE, INTEGRAL	DN 10 ~ 4000	PN 6 ~ 40
EN 1092-1	PLATE, LOOSE, BLIND, WN, SO, THREADED, WO PLATE, INTEGRAL	DN 10 ~ 3600	PN 6 ~ 400
JIS B2220	SOP, SOH, SW, WN, LJ, TR, IT, BL	DN 10 ~ 1500	5 ~ 63 K
MSS SP-44	BLD, WN	12" ~ 60"	CLASS 150,19.6bar ~ CLASS 900, 153.1 bar

5 Reasons Our Flanges Outperform Competitors

1. Zero Leak Guarantee

Hydrostatically tested at 1.5x rated pressure, with RTJ grooves machined to ±0.05mm accuracy.

2. Global Compliance

Certified to ASME B16.5, EN 1092-1, PED 2014/68/EU, and API 6A for oil/gas applications.

3. Corrosion Defense

Optional epoxy coating or hot-dip galvanizing (ISO 1461) for saltwater/chemical exposure.

4. Customization Ready

Modify bore sizes, bolt circles, or facings (RF/FF/RTJ) – MOQ 50 pieces.

5. Damage-Proof Packaging

Wooden crates with anti-rust VCI paper and edge protectors for overseas shipments.

Where Our Flanges Excel?

Oil & Gas: Wellhead connections, compressor stations
Power Generation: Steam turbine linkages, boiler feed systems
Water Infrastructure: Pump housings, filtration manifolds
HVAC: Chilled water loops, heat exchanger flanges

Trusted by Industries Worldwide

Our carbon steel pipe flanges meet the stringent demands of Shell’s Supplier Handbook, ADNOC Technical Standards, and EN 1092-1 Annex G compliance.