The carbon steel lap joint stub end is primarily used in detachable connection systems of industrial pipeline loose flange systems, serving as the core component for lap joint sealing, and is widely used in conventional industrial pipeline
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The carbon steel lap joint stub ends we produce use carbon steel materials such as 20#, A234 WPB, Q235B, 16Mn, WPL6, and comply with GB/T12459, ASME B16.9, MSS SP43 standards. The products are divided into four processes: long pattern LP, short pattern SP, pipe-made precision-turned, and plate-made rolled, covering DN15–DN3000. One end has a standard butt-weld bevel for welding to carbon steel pipelines, and the other end has a flat lap face to mate with a loose flange, allowing 360° rotational alignment, solving on-site construction problems such as bolt hole misalignment, fixed equipment nozzles, and connection in confined spaces. Carbon steel material has good weldability, stable strength, and low cost, suitable for pipelines conveying conventional media such as water, gas, steam, ordinary oil products, and fuel gas. We routinely stock DN15–DN600 stamped and pipe-made specifications, and can ship within 24–48 hours after payment confirmation. We support non-standard customization and export packaging.
| Product Name | Carbon Steel Stub End |
| Product Category | Flanges & Stub Ends |
| Customization | Our factory has full-specification, full-process, full-working-condition non-standard customization capability for carbon steel lap joint stub ends, and can undertake customized orders for various special parameters, special structures, and special working conditions. Dimensional customization covers DN15–DN3000 arbitrary non-standard diameters, non-conventional straight pipe lengths, widened and thickened lap faces, extra-thick pressure-bearing wall thicknesses, and eccentric irregular structures, precisely matching the needs of old pipe network renovation, imported equipment connection, and special engineering non-standard parameters. Process customization can provide precision-turned end faces, roundness correction, stress relief, sandblasting and rust removal, and anti-corrosion coating enhancement treatment, improving product precision and anti-corrosion durability. Material customization can provide 16Mn high-strength carbon steel, WPL6 low-temperature carbon steel, and high-temperature-resistant special carbon steel, suitable for special working conditions of extreme cold, heavy load, and high temperature. Can strictly according to customer |
| MOQ | To accommodate the diversified procurement needs of engineering replenishment, bulk centralized purchasing, foreign trade trial orders, and overseas stockpiling, carbon steel lap joint stub ends have flexible and lenient tiered minimum order rules. For DN15–DN600 conventional stamped and seamless standard specifications, and general materials such as carbon steel 20# and WPB, the MOQ is as low as 1 piece, supporting partial engineering replacement, single-piece equipment matching, foreign trade sample submission for inspection, and small-order trial |
| Lead Time | Our factory has a fully automated production line for the entire process of carbon steel lap joint stub ends, and routinely stocks massive carbon steel seamless pipes and carbon steel plate blanks, with complete specifications, ample production capacity, mature processes, and stable delivery. For DN15–DN600 stamped and pipe-made conventional in-stock specifications, after payment confirmation, quality inspection, packaging, and ultra-fast warehouse shipment are completed within 24–48 hours, fully meeting urgent engineering replenishment and urgent foreign trade orders |
| Packaging | Carbon steel lap joint stub ends use engineering-grade + foreign trade-grade dual protective packaging, taking into account both domestic transportation wear and damage prevention and sea freight rust and salt spray prevention needs. The bevel and lap joint sealing surface of each single product are covered with protective film to prevent collisions, scratches, wear, and deformation; small specifications are uniformly packed into thickened hard cardboard boxes with built-in moisture-proof desiccant to eliminate oxidation and rusting in humid environments. Medium and large diameter and plate-made large diameter products are individually wrapped with waterproof stretch film and pearl cotton, with overall reinforced protection to avoid deformation and paint loss from friction during transportation bumps. All boxed products are externally wrapped with waterproof stretch film for fully enclosed sealing, preventing dust, water, moisture, and loosening. Large-volume full-container shipments are uniformly stacked on fumigation-free solid wood pallets and secured and shaped with high-strength strapping, with a stable structure that is not easy to shift, fully complying with customs export inspection standards |
| Reference Price | Inquiry |
| Material | 20#, A234 WPB, Q235B, 16Mn, WPL6 and other carbon steels |
The carbon steel lap joint stub end is a lap joint sealing pipe fitting in a loose flange connection system. One end is a butt weld bevel, welded to the carbon steel main pipeline; the other end is formed into a flat lap joint face by hot pressing or finish turning, used in conjunction with a loose flange. During installation, the flange can rotate 360°, facilitating bolt hole alignment, suitable for fixed equipment nozzles, construction in confined spaces, and pipeline connections requiring disassembly and maintenance. We provide four processes: long pattern LP, short pattern SP, seamless pipe finish turned, and plate rolled and welded, covering DN15–DN3000. Carbon steel material has good weldability, stable strength, and low cost, suitable for normal temperature and medium-low pressure pipelines conveying water, gas, steam, ordinary oil products, gas, and other non-highly corrosive media.
The main advantages of the carbon steel lap joint stub end are high cost-effectiveness, sufficient stock, and convenient welding. Carbon steel material costs less than stainless steel and duplex steel, suitable for bulk centralized procurement and foreign trade volume sales. One end of the product is a butt weld bevel welded to the pipeline, and the other end is a lap joint face matched with a loose flange, capable of 360° rotational alignment, reducing on-site bolt hole misalignment and pipeline nozzle docking difficulties. Long pattern LP is suitable for high temperature and medium-high pressure main pipelines, short pattern SP is suitable for low pressure auxiliary pipe networks and municipal civil pipelines. For conventional specifications DN15–DN600, we keep stock regularly, and can ship within 24–48 hours after payment confirmation. For non-standard diameters, thickened lap joints, special lengths, low temperature materials, and other requirements, please contact us for customization.
The carbon steel lap joint stub end is used for pipeline systems at normal temperature, medium temperature, medium-low pressure, and without highly corrosive media. Municipal fields include urban water supply and drainage, sewage main pipes, residential community pipe networks, park heating transmission, and low pressure gas branch pipes. Industrial fields include chemical plant auxiliary pipe networks, refinery branch pipelines, power plant cooling circulation pipelines, plant compressed air pipe networks, and ordinary oil and gas transmission pipelines. Equipment matching includes storage tank inlet and outlet, boiler ordinary pipelines, and electromechanical equipment connecting pipes. Extra-large diameter main pipe networks can adopt the plate rolled and welded process. Low temperature carbon steel models can be used for outdoor pipe networks in cold northern regions. The product is not suitable for strongly acidic, strongly alkaline, high salt spray, and highly corrosive environments.
Carbon steel lap joint stub end materials include 20#, A234 WPB, Q235B, 16Mn, WPL6, etc. It complies with GB/T12459, ASME B16.9, and MSS SP43 standards. Structures are divided into long pattern LP, short pattern SP, seamless pipe finish turned, and plate rolled and welded. Diameters cover DN15–DN3000, and DN15–DN600 stamped and seamless pipe specifications are kept in stock regularly. Applicable media are water, gas, steam, ordinary oil products, gas, and other non-highly corrosive media. For conventional specifications DN15–DN600, MOQ is as low as 1 piece, and shipment is made within 24–48 hours after payment confirmation. For non-standard customization and special materials, please contact us to confirm specific parameters and delivery time.
We set tiered minimum order rules for carbon steel lap joint stub ends. For conventional stamped and seamless pipe specifications DN15–DN600, carbon steel 20# and WPB materials have an MOQ as low as 1 piece, suitable for project replenishment, single-piece equipment matching, and foreign trade samples. Conventional stock for DN15–DN600 completes quality inspection, packaging, and shipment within 24–48 hours after payment confirmation. Non-standard customized orders require delivery time confirmation based on drawings or technical agreements. Packaging adopts dual protection of engineering grade and foreign trade grade: bevels and sealing faces are covered with protective film, small pieces are packed in thickened cartons with desiccant, medium and large diameters are individually wrapped with waterproof stretch film and pearl cotton, and full container shipments are stacked on fumigation-free solid wood pallets, complying with customs export inspection standards. English shipping marks, project numbers, and specification labels can be customized.
We provide pre-sales selection support for carbon steel lap joint stub ends, including working condition confirmation, material matching, pressure rating adaptation, and flange matching suggestions. After-sales, we provide technical Q&A for welding protection, pipe network operation and maintenance, and troubleshooting. Before leaving the factory, products undergo appearance inspection, dimensional inspection, material spectral verification, hydrostatic pressure testing, and weld seam inspection. The warranty period is 18 months, and during the warranty period, quality problems caused by non-human damage are repaired or replaced free of charge. Orders can be tracked throughout the logistics process, assisting overseas customers with customs clearance and receipt. If you need to confirm specific parameters or customization requirements, please contact us.
Suitable for normal-temperature, medium-temperature, medium-low-pressure industrial and municipal pipelines conveying water, air, steam, ordinary oil products, gas, and other media without strong corrosion. Not suitable for strongly acidic, strongly alkaline, or high-salt-spray highly corrosive environments.
Long-type LP is suitable for high-temperature, medium-high-pressure main pipelines, and can isolate the welding heat zone to protect the sealing surface. Short-type SP is cost-effective and suitable for low-pressure auxiliary pipe networks and municipal civil pipelines. For specific selection, please contact us to confirm.
Products with large diameters of DN600 and above use a plate-rolled manufacturing process, and can cover up to DN3000. For specific process parameters and delivery time, please contact us to confirm.
Yes. Carbon steel lap joint stub ends are used together with carbon steel loose flanges to form an all-carbon-steel economical connection system, reducing project costs.
We can provide customs clearance and acceptance documents such as 3.1 material certificates, spectrum reports, CE certification, flaw detection reports, and certificates of conformity. For specific certificate requirements, please contact us to confirm.
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