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Stainless Steel Lap Joint Flange

Forged Stainless Steel Lap Joint Flange is composed of a butt-welding ring and a loose flange. The butt-welding ring is crafted through forging. This forging process refines the internal metal structure, eradicates internal flaws, and significantly enhances the strength and toughness of the butt - welding ring.

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Introduction

Stainless Steel Lap Joint Flange is a loose flange used together with a stub end for pipeline connection, dismantling, and maintenance in industrial piping systems.

Size: 1/2″~24″ (DN15~DN600)

Pressure: 150#, 300#, 600#, 900#, 1500#, 2500#

Material: 20#, A105, 16Mn, A350 LF2; F304/304L, F316/316L, F316Ti, F321, F317L, S31803(F51), S31254(F44), S32750(F53), S32760(F55); ASTM A182 F9, F11, F12, F22, F91, etc.

Material: round steel, steel ingot

Standard: ASME B16.5, GB/T9124.2-2019, HG/T20615-2009, etc.

Machining Quality Control

Forging Process Control

Forged according to corresponding pressure class requirements to reduce deformation risk under high-pressure conditions.

CNC Precision Machining

Sealing faces, bolt holes, and key dimensions processed through unified CNC machining for more consistent flange installation fitting.

Sealing Face Precision

RF sealing face roughness controlled according to machining requirements to help reduce leakage risks.

Dimensional & Material Inspection

Bolt hole positions, thickness, and material information supported with individual inspection and traceability.

Technical Specifications & Dimensions

RF lap joint flange

RJ lap joint flange

Applicable Pressure and Size Range of Lap Joint Flange

ASME B16.5, HG/T20615)	Sealing Surface Type	PN
		Class(LB)/Mpa/Bar
		150LB	300LB	600LB	900LB	1500LB	2500LB
		2.0	5.0	11.0	15.0	26.0	42.0
		20	50	110	150	260	420
	RF	DN15-600 (1/2"-24")					DN15-300 (1/2"-12")
	RJ	DN15-600 (1/2"-24")					DN15-300 (1/2"-12")

OutsCore Technical Value

Rotating flange structure allows easier bolt hole alignment during installation.

Better suited for systems requiring frequent dismantling with stub ends.

Media mainly contacts the stainless steel wetted end, reducing corrosion impact on the flange body.

Machined sealing surfaces improve flange fitting stability.

Loose flange structure reduces installation adjustment pressure

Standards & Compliance

Manufactured according to ASME, ANSI, DIN, and related standards.

Pressure ratings and connection dimensions processed based on corresponding standards.

Support for export project inspection and documentation requirements.

MTC and related inspection documents available.

Customization Services

Non-Standard Dimension Processing

Custom outer diameter, thickness, and bolt hole production available.

Special Stainless Steel Requirements

Duplex steel and special stainless steel options supported.

Special Surface Treatment

Custom pickling, sandblasting, and protective treatments available.

Service & Project Coordination

Engineering Order Scheduling

Support for simultaneous production arrangement of mixed-size and mixed-pressure orders.

Long-Distance Transport Packaging

Wooden cases and moisture-protection packaging supported for sea shipment.

After-Sales Feedback Support

Support for order and specification issue handling.

FAQ

1. What parameters need to be confirmed during procurement?

Key parameters include pressure rating, pipe size, material grade, and matching stub end specifications, as these directly affect system compatibility.

2. What is typically considered when selecting this product in projects?

Selection is usually based on site construction conditions, such as installation space, maintenance frequency, and whether the assembly method fits the project workflow.

3. How is material selection generally determined?

Material grade is selected based on media type, corrosion conditions, and operating temperature, as different projects require different corrosion resistance and strength levels.

4. What confirmation steps are usually involved before delivery?

Typical steps include drawing confirmation, dimensional verification, and technical communication prior to production to ensure consistency with project requirements.

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