GB standard elbow

National standard elbows are pressure-bearing directional fittings specially used in national standard industrial pipeline systems. They are mainly used to change the conveying direction of various fluid pipelines and are widely suitable fo

GB standard elbow - GB elbows fully compatible with all domestic GB pressure pipeline scenarios

GB standard elbow

National standard elbows are pressure-bearing directional fittings specially used in national standard industrial pipeline systems. They are mainly used to change the conveying direction of various fluid pipelines and are widely suitable fo

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  • National standard elbows have four core advantages: national standard compliance and universality, mature craftsmanship, stable pressure-bearing capacity, and high cost-effectiveness
  • they are the preferred pipeline direction-change fittings for domestic engineering and foreign-aid projects. First
  • strictly follow GB/T124599 and GB/T13401 national standards for production
  • dimensions, wall thickness, bevels, and pressure-bearing parameters fully match national standard drawings
  • universally applicable to engineering nationwide, worry-free acceptance
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Detailed Introduction

National standard elbows are formed by stamping and pushing seamless steel pipes or by rolling and welding steel plates, with an integrally formed structure, used for pipeline direction changes, slight adjustment of routing, and pipeline avoidance. The products strictly align with GB/T12459-2017 "Steel Butt-Welding Seamless Pipe Fittings" and GB/T13401-2017 "Steel Plate Butt-Welding Pipe Fittings"; dimensions, wall thickness, bevels, and pressure-bearing parameters match national standard drawings, and they are suitable for the compliance requirements of domestic bidding, engineering inspection, and foreign aid export projects. Conventional supply angles are 45°, 90°, and 180°; bending radii are divided into long radius 1.5D and short radius 1.0D; nominal diameter ranges from DN15 to DN1200, among which seamless elbows cover small and medium diameters, and rolled elbows cover large-diameter specifications. Commonly used materials include 20# carbon steel, Q235B, 16Mn alloy steel, 304 and 316L stainless steel; the connection method is butt-welding bevel connection, suitable for on-site welding construction. At factory delivery, documents such as material certificates, non-destructive testing, and hydrostatic testing can be provided, and both spot supply and non-standard customization according to drawings are supported.

  • Complies with the two national standards GB/T12459-2017 and GB/T13401-2017; dimensions, wall thickness, bevels, and pressure-bearing parameters match national standard drawings, and it can be used for domestic engineering bidding and inspection.
  • Angle specifications cover the conventional standard angles 45°, 90°, and 180°; bending radii are divided into long radius 1.5D and short radius 1.0D; nominal diameter ranges from DN15 to DN1200.
  • Materials can be selected from 20# carbon steel, Q235B, 16Mn alloy steel, 304 and 316L stainless steel, adapting to pipeline systems with different media and working conditions.
  • Two forming processes are available: seamless stamping and pushing, and steel plate rolling and welding; seamless elbows cover small and medium diameters, and rolled elbows cover large-diameter specifications.
  • At factory delivery, documents such as material certificates, non-destructive testing, and hydrostatic testing can be provided, meeting the compliance requirements of domestic engineering inspection and foreign aid export projects.
  • Supports spot supply and non-standard customization according to drawings; for conventional DN15-DN200 standard specifications, MOQ is as low as 1 piece; for conventional long-radius 90° standard models from DN15-DN400, spot stock is sufficient; after payment confirmation, sorting, packing, and shipping are completed within 24-48 hours.
Product NameGB Elbow
Product CategoriesElbows
All parameters of national standard elbows strictly align with the authoritative national standards GB/T12459-2017 and GB/T13401-2017; parameters are compliant, universally applicable nationwide, and exempt from engineering inspection. Angle specifications45°, 90°, 180° conventional standard angles, supporting custom irregular angles; Bending radius: long radius 1.5D (mainstream), short radius 1.0D. Nominal diameter range: DN15-DN1200, seamless elbows cover small and medium diameters, rolled elbows cover large-diameter non-standard specifications. Wall thickness grades: compatible with national standard ordinary wall thickness, thickened wall thickness, high-pressure SCH series wall thickness, meeting low-pressure, medium-pressure, and high-pressure full working condition pressure-bearing requirements. Common materials: 20#, Q235B, 16Mn, 304, 316L, material mechanical properties conform to national standard forging and plate standards. Connection method: national standard butt-welding bevel connection, suitable for on-site welding construction. Working temperature: -20℃ to 450℃ carbon steel working conditions, -196℃ to 600℃
CustomizationOur factory possesses deep non-standard customization capability for full-specification national standard elbows, strictly in accordance with GB/T12459 and GB/T13401 national standards, undertaking customization orders for various special working conditions, special sizes, and special processes. Supporting non-standard angle customization: 22.5°, 30°, 60° and various irregular special angle elbows; supporting non-standard radius customization: extended radius, short radius customization, special arc length elbows. Supporting large-diameter non-standard rolled customization, DN600-DN1200 super large diameter non-standard wall thickness, reducing elbows customization, suitable for large-scale municipal, chemical, and electric power key projects. Supporting material customization: 20#, Q235B, 16Mn, 304, 316L, duplex steel and other full-series national standard material customization. Supporting process customization:
MOQNational standard elbows adopt a relaxed and flexible minimum order mechanism, suitable for the full-scenario procurement needs of engineering sporadic supplementary orders, sample submission for inspection, batch centralized procurement, and foreign trade full-order shipment, with no high minimum order threshold. Conventional DN15-DN200 national standard specifications, 20# carbon steel, 304 stainless steel general-purpose stock models, MOQ as low as 1 piece, supporting construction site repair parts, sample submission for inspection, small project zero
Lead TimeOur factory has national standard elbow automated production lines and a large-scale spot goods warehousing base, routinely stocking massive inventory of national standard conventional specifications, ensuring extremely fast delivery for domestic engineering and foreign trade orders. DN15-DN400 conventional long radius 90° national standard elbows, ordinary carbon steel and stainless steel standard models, sufficient stock, completing sorting, packing, and shipping within 24-48 hours after payment confirmation, extremely fast response
PackagingNational standard elbows adopt engineering-grade standardized protective packaging, accommodating multiple needs of domestic short-distance transportation, long-distance logistics, and foreign trade export ocean shipping, eliminating transportation collisions, bevel damage, rust and deformation. Small-diameter precision elbows are fully wrapped with bubble film and stretch film, with thickened plastic protective rings on ports, protecting welding bevels flat and undamaged, avoiding collision deformation and impurities entering the pipe. Small and medium batches are neatly packed into thickened cartons and woven bags with classified packaging, labeled with specifications, materials, standards, and batches, eliminating mixed loading and confusion. Large-diameter, thick-wall, high-pressure national standard elbows are wrapped with multi-layer stretch film + rainproof cloth, with special protective port sealing, and solid wood pallets added at the bottom for fixation, reinforced with steel straps to prevent displacement, preventing transportation deformation and paint surface wear. Carbon steel products are factory-sprayed with black anti-rust paint, transparent
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Applications

  • Pipe turning and direction adjustment in municipal water supply and drainage networks, road supporting pipelines, municipal fire protection networks, and urban-rural heating thermal pipelines
  • Pipeline connection and turning in thermal power plant steam pipelines, hydropower station water supply and drainage pipelines, new energy plant process networks, and central heating main networks
  • Medium conveyance and turning in petroleum refining production lines, chemical fluid transport pipelines, natural gas transmission and distribution networks, and storage tank supporting pipeline systems
  • Pipeline avoidance and layout adjustment for factory circulating water pipelines, HVAC pipelines, and industrial plant fluid pipeline networks
  • Pipeline direction fittings selected and procured according to national standard drawings in Chinese-funded overseas EPC aid projects and Belt and Road national standard engineering projects
  • National standard pipe fitting supporting procurement during the stages of pipeline design institute drawing selection, mechanical and electrical installation engineering budget submission for review, and project acceptance

Procurement & Delivery

National standard elbows conventional DN15-DN200 standard specifications, 20# carbon steel and 304 stainless steel general-purpose in-stock models with MOQ as low as 1 piece, supporting construction site repair replacement parts, sample submission for inspection, and small project sporadic procurement. DN15-DN400 conventional long-radius 90° standard models are sufficiently in stock, and sorting, packing, and shipping are completed within 24-48 hours after payment confirmation. Non-standard customized products are scheduled for production according to drawings and quantity; please contact us to confirm the specific delivery time. Packaging is carried out according to engineering-grade standardized protection, taking into account domestic short-distance transportation, long-distance logistics, and foreign trade export sea freight requirements. Small-diameter elbow ports are equipped with protective rings to protect welding bevels, and large-diameter elbows use solid wood pallets for fixation and steel straps for reinforcement to prevent displacement. Carbon steel products are factory-sprayed with black anti-rust paint or transparent anti-rust oil, and stainless steel products are pickled and passivated and then film-covered for protection. All packaging supports customized shipping marks and labels, and can meet domestic project site acceptance standards as well as foreign trade export commodity inspection and sea freight warehousing requirements. If you need to know the inventory status and shipping arrangements for specific specifications, you are welcome to contact us for confirmation.

Service & Support

We provide procurement customers with full-cycle services for national standard pipe fittings. Before sales, we can assist with working condition selection, specification matching, wall thickness and pressure calculations, and interpretation of national standards, helping to avoid engineering rework caused by selection errors and non-compliance with standards. During sales, dedicated customer service is arranged for order tracking, synchronizing production progress, quality inspection processes, and shipping logistics information, and supporting minor adjustments to order parameters, expedited production scheduling, reissuance of qualification documents, and batch traceability inquiries. After sales, long-term warranty service is provided; for products with quality defects under national standard compliant working conditions and without human-caused damage, free replacement or reshipment is supported. We can provide guidance on national standard elbow welding processes, pipeline installation specifications, and anti-corrosion maintenance, and assist with engineering acceptance and document submission for review issues. Long-term cooperative customers enjoy the benefits of inventory reservation, priority production scheduling, and priority after-sales response. If you need to confirm specific service content or submit customization requirements, please contact us.

FAQ

What standards do national standard elbows implement?

Seamless elbows implement GB/T12459-2017 Steel Butt-Welding Seamless Pipe Fittings, and large-diameter rolled welded seam elbows implement GB/T13401-2017 Steel Plate Butt-Welding Pipe Fittings. Product dimensions, wall thickness, bevels, and pressure-bearing parameters align with national standard drawings, and are suitable for domestic engineering bidding and submission for inspection. If you need to confirm the standard clauses corresponding to specific specifications, please contact us.

What is the difference between national standard elbows and non-standard elbows?

The dimensions, wall thickness, bevels, and materials of national standard elbows are produced in accordance with national standards, with tolerances meeting requirements and stable pressure-bearing capacity, and can be used for formal engineering acceptance. Non-standard elbows usually have thinner wall thickness and larger dimensional deviations, are suitable for simple low-pressure pipelines, and cannot be used for formal pressure-bearing projects. If you are unsure whether your project should use national standard or non-standard products, please contact us for assistance in confirming.

Do you support third-party inspection for engineering acceptance?

All national standard products support third-party testing, spectral analysis, and non-destructive testing. At the factory, we can provide material certificates, non-destructive testing reports, hydrostatic test reports, and other documents, meeting the compliance requirements for domestic engineering submission and foreign aid export projects. The specific testing items and document list can be confirmed according to project requirements; please contact us.

What is the regular delivery time?

DN15-DN400 regular long-radius 90° national standard elbows, ordinary carbon steel and stainless steel standard models are in sufficient stock. After payment confirmation, sorting, packing, and shipping will be completed within 24-48 hours. Non-standard customized products are scheduled for production according to drawings and quantity; please contact us to confirm the delivery time.

What customization options are supported?

We support non-standard angle customization (22.5°, 30°, 60°, and irregular angles), non-standard radius customization (extended radius, short radius, special arc length), large-diameter non-standard rolled customization (DN600-DN1200 extra-large diameter non-standard wall thickness, reducing elbows), material customization (20#, Q235B, 16Mn, 304, 316L, duplex steel, etc.), and process customization (pickling and passivation, sandblasting and rust removal, hot-dip galvanizing, anti-corrosion coating, national standard high-pressure thickening process). We can optimize solutions one-on-one according to customer drawings, parameters, and working conditions. Please contact us for confirmation.

What is the minimum order quantity?

Standard DN15-DN200 national standard specifications, 20# carbon steel and 304 stainless steel general stock models MOQ as low as 1 piece, supporting construction site repair parts, sample submission for inspection, and small project sporadic procurement. For the MOQ of other specifications and materials, please contact us to confirm.

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