Carbon Steel Weld Neck

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

High-Performance Carbon Steel Weld Neck Flanges for Demanding Industrial Systems

At Xi'an QinSteel Trading Co., Ltd, we engineer Carbon Steel Weld Neck flanges that redefine reliability in high-pressure pipeline systems. With over 20 years of specialized R&D and API-certified manufacturing, our weld necks deliver unmatched structural integrity for oil & gas, petrochemical, and power generation projects. Designed to ASME B16.5, API 6A, and EN 1092-1 standards, these flanges ensure leak-proof performance even under extreme temperatures (up to 600°F) and corrosive environments.

Precision Engineering Meets Global Standards

Our products combine optimal stress distribution with robust material grades like ASTM A105 and A350 LF2. Key features include:

Full Pressure Range: CLASS 150 to CLASS 2500 (PN 6 to PN 400)
Universal Compatibility: RF, FF, RTJ, M&F, and T&G facing options
Size Versatility: ½” to 60” diameters for standard and custom configurations
Certified Durability: API 6A, ISO 9001, PED, and NACE MR0175 compliance

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