The national standard tee is a core pressure-bearing pipe fitting in industrial piping systems for realizing medium diversion, confluence, and branch connection. It is widely used in various national standard pressure piping projects. Its m
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National standard tees are produced in accordance with Chinese national standards. Seamless tees comply with GB/T 12459, and steel plate butt-welded tees comply with GB/T 13401. They are core pipe fittings used for flow diversion and convergence in domestic pressure piping systems. Products are divided into equal-diameter tees and reducing tees. DN15 to DN600 are mostly formed by integral seamless stamping, while sizes above DN600 are formed by steel plate die pressing and rolling. Commonly used materials include 20# carbon steel, Q235B, 16Mn, 304 and 316L stainless steel. Wall thickness grades include STD, XS and XXS, corresponding to pressure ratings from PN10 to PN100. Dimensional tolerances, bevels and mechanical properties are implemented according to national standards, and they can be used together with national standard elbows, flanges and reducers. We can provide flaw detection, hydrostatic testing and material spectral testing according to project requirements, along with factory documentation, for domestic engineering inspection applications, bidding and overseas Chinese-funded projects. For specific specifications, materials and testing requirements, please contact us to confirm.
| Product Name | GB Standard Tee |
| Product Categories | Tees & Crosses |
| All technical parameters of national standard tees strictly follow the two authoritative national standards GB/T12459 for seamless pipe fittings and GB/T13401 for welded pipe fittings. Parameters are unified, universally applicable nationwide, and exempt from inspection in engineering. Specification system | Diameter range DN15-DN2000, divided into two major structures: equal-diameter tees and reducing tees. The reducing specifications cover all mainstream reducing combinations, meeting the reducing and flow-dividing needs of various pipelines. Forming process: DN15-DN600 adopts integral seamless stamping forming, and those above DN600 adopt national standard steel plate die-pressing and rolling process. Mainstream national standard materials: 20# high-quality carbon steel, Q235B carbon steel, 16Mn low-alloy high-strength steel, 304/316L stainless steel. Wall thickness grades include STD standard wall thickness, XS extra-heavy, and XXS double extra-heavy, adapting to the full pressure rating from PN10 to PN100. Working temperature range: carbon steel -20℃ to 450℃, alloy steel -40℃ to 500℃, stainless steel -196℃ to 65 |
| Customization | Our factory is based on national standards and possesses the capability for precise fine-tuning customization, special ratios, and special process upgrade customization on the basis of national standards. Without changing the core parameters of national standards, it meets the special working condition needs of various projects. It supports special thickening customization of conventional national standard specifications, ultra-high-pressure wall thickness upgrades, and special reducing non-standard ratio tee customization, adapting to special reducing and flow-dividing pipelines. It supports national standard tees with straight sections extended, special-angle machining of end face bevels, and customization of unequal lengths at both ends, adapting to on-site special installation distances and butt-joint working conditions. It supports national standard material upgrade customization, with 20# carbon steel, 16Mn low-temperature high-strength steel, 304/316L stainless steel, and duplex steel special materials produced on demand. It supports process upgrade customization, with dedicated stress relief heat treatment and precision for national standard products |
| MOQ | National standard tees adopt an engineering-grade loose and flexible minimum order mechanism, adapting to the diverse procurement needs of scattered site replenishment, pipeline network maintenance, sample submission for inspection, batch centralized procurement, and full-order supporting for large projects, with no high minimum order threshold. For conventional 20# carbon steel and 304 stainless steel mainstream national standard in-stock tees, the MOQ is as low as 1 piece, supporting scattered point replenishment at various sites, single-piece replacement of old pipeline networks, and single |
| Lead Time | Our factory has large-scale mass production workshops for national standard pipe fittings and massive in-stock reserves, with an in-stock coverage rate exceeding 98%, and can rapidly respond to the delivery needs of domestic and overseas Chinese-invested projects. DN15-DN600 conventional equal-diameter and reducing national standard carbon steel and stainless steel tees are sufficiently in stock. After order confirmation, sorting, quality inspection, fine packaging, and loading for shipment can be completed within 24-48 hours, rapidly |
| Packaging | National standard tees adopt standardized protective packaging commonly used in domestic engineering and export, taking into account both rough transportation at domestic construction sites and the protection needs of foreign trade ocean shipping, comprehensively preventing bevel collisions, pipe end deformation, surface rust, and transportation wear. Small-diameter precision national standard tees are equipped with high-strength plastic protective caps at both ends, sealing the pipe ends to protect the welding bevels, preventing the entry of impurities and damage from edge collisions; the exterior is independently wrapped with multiple layers of waterproof film and bubble film to achieve shockproof and moisture-proof protection. Small and medium-sized standard tees are classified and packed into thickened export cartons, clearly marked with national standard, DN specification, material, pressure rating, and production batch, neatly classified to prevent mixed loading and confusion. Large-diameter, thick-wall high-pressure, and heavy-duty national standard tees are wrapped overall with anti-rust stretch film, with an outer layer of rainproof cloth for protection, and the bottom |
| Reference Price | Inquiry |
The MOQ for conventional 20# carbon steel and 304 stainless steel mainstream in-stock tees is as low as 1 piece, suitable for sporadic on-site replenishment and single-piece replacement; for bulk centralized procurement and whole-order supporting, please contact us to confirm production scheduling and inventory. DN15 to DN600 conventional equal-diameter and reducing carbon steel and stainless steel tees are sufficiently in stock. After order confirmation, sorting, quality inspection, packaging, and loading for shipment will be completed within 24 to 48 hours. For delivery times of other materials, large diameters, or customized specifications, please provide dimensions, material, quantity, and inspection requirements, and we will assist in confirming. Packaging is designed for two scenarios: domestic construction site delivery and foreign trade ocean shipping. Small diameters are fitted with plastic protective caps and waterproof film, small and medium specifications are packed in thickened export cartons, and large diameters use anti-rust wrapping film, rainproof cloth, solid wood pallets, and steel strip reinforcement. Carbon steel products are sprayed with anti-rust oil, and stainless steel products are pickled, passivated, and film-covered. Outer packaging can be customized with Chinese and English shipping marks, project names, and customer LOGOs.
Before sales, we provide consultation on national standard working condition selection, pressure rating matching, and reducing specification ratio configuration, and recommend national standard models according to medium, temperature, and pressure. During sales, we provide one-on-one contact, synchronizing inventory status, shipping progress, batch quality inspection reports, and qualification lists, supporting partial supply, on-demand replenishment, and slight specification adjustments. After sales, we implement national standard pipe fitting warranty service. For quality defects caused by non-human installation errors under compliant working conditions, we support free returns and exchanges, reissue products, and bear the corresponding losses. We can provide free technical guidance on national standard tee welding processes, pipeline diversion installation specifications, and pipeline network maintenance, assisting construction sites in completing inspection applications, third-party sampling inspections, and completion acceptance. Long-term engineering customers can enjoy inventory reservation, priority shipping, and long-term technical traceability benefits. For specific warranty terms and after-sales scope, please contact us to confirm.
Seamless tees implement GB/T 12459, and steel plate butt-welded tees implement GB/T 13401. These two standards specify nominal diameter, wall thickness, dimensional tolerances, and bevels, and products are produced and inspected according to them.
When the DN, wall thickness, and pressure rating are the same, the dimensional parameters of national-standard tees are consistent and they can be universally replaced without on-site pipe modification. Products of different standards or non-standard products are not included in this.
DN15 to DN600 regular equal-diameter and reducing carbon steel and stainless steel tees are in ample stock. After order confirmation, sorting, quality inspection, packaging, and loading for shipment are completed within 24 to 48 hours. For other materials, large diameters, or customized specifications, please contact us to confirm production scheduling and delivery time.
Regular 20# carbon steel and 304 stainless steel mainstream in-stock tees have an MOQ as low as 1 piece, suitable for sporadic on-site replenishment and single-piece replacement. For the MOQ of other materials and specifications, please contact us to confirm.
We can provide flaw detection, hydrostatic testing, and material spectral analysis according to project requirements, along with factory documentation, for domestic engineering inspection applications, bidding, and overseas Chinese-funded projects. For specific testing items and the documentation list, please confirm with us before placing an order.
Supports customization on the basis of national standards, including thickening, non-standard size matching for reducing diameters, extension with straight sections, bevel angle adjustment, material upgrades, and anti-corrosion treatment. Please provide drawings or specific parameters, and we will assist in confirming the solution.
The packaging is designed for two scenarios: domestic construction site delivery and foreign trade ocean shipping. Small diameters are fitted with plastic protective caps and waterproof film, small and medium specifications are packed in thickened export cartons, and large diameters use anti-rust wrapping film, rainproof cloth, solid wood pallets, and steel strip reinforcement. The outer packaging can be customized with Chinese and English shipping marks, project names, and customer LOGOs.
Please provide information such as nominal diameter, material, wall thickness grade, pressure rating, quantity, and whether flaw detection or hydrostatic testing is required. We will assist with the quotation based on the specifications and quantity.
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