Nickel-based alloy lap joint stub ends are a type of special lap joint flange pipe fitting, formed from nickel-based alloy pipe blanks or plates, with one end being a butt-weld bevel for fusion welding to pipes of the same material, and the other end being solution-treated and finish-turned to form a flat lap joint surface, which can be rotationally aligned with a loose flange. We routinely stock Hastelloy, Monel, Inconel, and Incoloy series materials, covering both LP long-type and SP short-type structures, with manufacturing referencing standards such as GB/T12459, ASME B16.9, MSS SP43, and ASTM SB366. The products are used in highly corrosive, ultra-high-temperature, high-purity sterile, or high-radiation pipelines where stainless steel, duplex steel, and alloy steel cannot perform, helping to solve problems of butt-joint misalignment, high-temperature deformation, and maintenance in confined spaces. For specific diameters, materials, pressure ratings, and delivery cycles, please contact us for confirmation.
Overview
Nickel-based alloy lap joint stub end is a lap-type pipe fitting, with one end being a butt welding bevel, welded to a nickel-based pipe of the same material; the other end undergoes solution treatment and finish turning to form a lap sealing surface, used in conjunction with a loose flange. It is mainly used in extreme working conditions that ordinary stainless steel, duplex steel, and alloy steel cannot handle, such as ultra-high temperature, strong acids and alkalis, high chloride ions, high radiation, or high-purity aseptic pipelines. We provide Hastelloy, Monel, Inconel, and Incoloy series materials, structurally divided into LP long type and SP short type, manufactured with reference to standards such as GB/T12459, ASME B16.9, MSS SP43, ASTM SB366, etc.
Key Features
First, the material coverage is wide, and Hastelloy, Monel, Inconel, or Incoloy series can be selected according to the medium corrosion type and temperature. Second, the LP long type can isolate the welding heat-affected zone and protect the sealing surface, suitable for main process pipe networks; the SP short type is suitable for auxiliary pipelines with limited space. Third, the lap end combined with a loose flange can rotate for alignment, reducing sealing problems caused by pipeline misalignment and high-temperature deformation. Fourth, it supports non-standard diameters, special wall thicknesses, and sealing surface customization, and can be produced according to drawings, samples, or technical agreements. Fifth, before leaving the factory, quality inspections such as spectral verification, dimensional re-measurement, and hydrostatic testing are carried out to ensure batch consistency.
Applications
In the nuclear power and aerospace fields, it is used for cooling pipe networks, high-temperature pipelines, and heat-resistant and corrosion-resistant transportation systems; in deep-sea oil and gas and marine engineering, it is used for platform pipelines, high-chloride seawater transportation, and coastal installations; in fine chemicals, it is used for strong oxidants, concentrated acids and alkalis, and high-temperature sulfidation medium transportation; in biomedicine, it is used for aseptic pharmaceutical and high-purity fluid systems; in oil and gas energy, it is used for high-sulfur and high-carbonate acid wellheads and deep well high-temperature and high-pressure gathering and transportation pipelines. Different materials correspond to different working conditions, for example, C276 is suitable for strong corrosion, 625 is suitable for high temperature and high pressure, 825 is suitable for chloride ion environments, and 400 is suitable for seawater working conditions. For specific selection, please contact us to confirm.
Specifications
We can provide lap joint stub ends with diameters from DN15–DN3000, structurally divided into LP long type and SP short type, with materials covering Hastelloy, Monel, Inconel, and Incoloy series. Manufactured with reference to standards such as GB/T12459, ASME B16.9, MSS SP43, ASTM SB366, etc. Non-standard diameters, special straight pipe lengths, thickened sealing surfaces, special wall thicknesses, etc. can be customized according to project requirements. Prices and delivery cycles fluctuate according to material, diameter, and quantity; please contact us to confirm.
Procurement & Delivery
We set tiered minimum order quantities, suitable for sample submission for inspection, engineering replacement parts, and bulk centralized procurement. Raw materials are stocked for conventional pipe and stamped specifications, and solution treatment, quality inspection, and packaging are arranged after order confirmation. Packaging uses PE film vacuum wrapping, sealing surface anti-scratch protection, bevel edge protective rings, moisture-proof cartons, and fumigated wooden pallets, suitable for ocean shipping. Customized English shipping marks, material identification, and batch numbers are supported. For specific MOQ, delivery time, and logistics solutions, please contact us to confirm.
Service & Support
Before sales, we provide working condition selection, alloy matching, pressure rating adaptation, and flange matching suggestions. After sales, we provide answers on welding, solution treatment protection, and pipe network operation and maintenance, full-process logistics tracking for orders, and assistance with customs clearance for overseas customers. The product warranty period is 18 months, with 7×24 hour response. If there are factory production quality defects, we support free returns and exchanges and replacements. Welcome to contact us to confirm technical details and project requirements.
FAQ
What working conditions are nickel-based alloy lap joint stub ends suitable for?
It is mainly used in extreme working conditions such as ultra-high temperature, concentrated acids and alkalis, strong oxidation, deep-sea high chloride, high-sulfur oil and gas, nuclear power radiation, and pharmaceutical high purity, covering scenarios that stainless steel, duplex steel, and alloy steel cannot handle. For specific suitability, please contact us to confirm the medium, temperature, and pressure parameters.
How should different nickel-based materials be selected?
C276, C22 and other Hastelloy alloys are suitable for highly corrosive working conditions; 625, 718 and other Inconel alloys are suitable for ultra-high temperature and high pressure; 800, 825 and other Incoloy alloys are suitable for chloride ion corrosion environments; 400 Monel is suitable for seawater working conditions. The final selection needs to be combined with medium concentration, temperature and pressure; please contact us to confirm.
What is the difference between LP long type and SP short type?
The LP long type can isolate the welding heat zone and protect the sealing surface, and is suitable for main process pipelines; the SP short type has a shorter structure and is suitable for auxiliary pipelines with limited space. We can provide both structures; for specific selection, please contact us to confirm the installation space and working condition requirements.
Do you support non-standard customization?
We support customization of DN15–DN3000 non-standard diameters, special straight pipe lengths, thickened sealing surfaces, special wall thicknesses, etc., and can produce according to drawings, samples or technical agreements. Materials can be customized across the full Hastelloy, Monel, Inconel and Incoloy series. Please provide dimensions and quantity so that we can assist with a quotation.
What are the minimum order quantity and delivery lead time?
We set tiered minimum order quantities, suitable for sample submission for inspection, project replenishment and bulk centralized procurement. Raw materials are stocked for conventional pipe and stamped specifications, and production is arranged after order confirmation. The specific MOQ and delivery time are determined according to material, diameter and quantity; please contact us to confirm.
