Weld Neck Pipe Flanges

TYPE: RF, FF, RTJ, M&F, T&G. Material: A105, A350 LF2, A36, SS 400, A182 F11/F304/F316/F51/F53/F55 etc. Size: 1/2" ~ 60" Standard: ASME B16.5/B16.36/B16.47, API 6B/605, BS 3293/4504, EN 1092-1, JIS B2220, MSS SP-44 Pressure: CLASS 150 ~ CLASS 2500, PN 6 ~ PN 400 Flange Facing: RF, FF, RTJ, M&F, T&G. Customization: OEM/ODM service. Samples: Sample service available.

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Product Description

Xi'an QinSteel Trading Co., Ltd | High-Performance Weld Neck Pipe Flanges for Demanding Industrial Systems

When you need leak-proof connections for high-pressure pipelines, Weld Neck Pipe Flanges deliver unmatched reliability. At Xi’an QinSteel, we specialize in manufacturing flanges that meet ASME B16.5, API 6A, and EN 1092-1 standards, backed by 15+ years of expertise in serving oil, gas, and power industries. Our GMP-certified facility combines advanced CNC machining with rigorous quality checks to ensure every flange withstands extreme temperatures and pressures.

Durable Weld Neck Flanges Built for Critical Applications

Our products are engineered to optimize stress distribution in piping systems, minimizing failure risks in corrosive or high-vibration environments. With sizes from ½" to 60" and pressure ratings up to Class 2500 (PN 400), they’re ideal for:

Oil & Gas Pipelines: Offshore platforms, refinery transfer lines
Power Plants: High-temperature steam systems
Chemical Processing: Corrosion-resistant alloy solutions

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	DN 15 ~ 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

Custom sizes, RTJ/T&G facings, and coatings available via OEM/ODM services.

Why Our Weld Neck Flanges Outperform?

1. Global Compliance, Local Reliability

Every flange undergoes material traceability checks and non-destructive testing (NDT) to comply with API, ASME, and PED standards for Weld Neck Pipe Flanges.