The national standard reducer is mainly used for the smooth transition connection of pipe diameters in industrial piping systems under the national standard system, realizing the smooth transition between large and small pipe diameters, pre
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National standard reducers are used to connect two pipes of different nominal diameters in national standard pipeline systems, adjusting medium flow velocity, flow rate, and pressure through the reducing structure, reducing fluid turbulence impact and local scouring wear. Products are manufactured according to GB/T 12459 and GB/T 13401. Concentric reducers are mostly used for vertical pipes and inlets/outlets of vertical equipment, while eccentric reducers are used for horizontal pipes and can prevent gas and liquid accumulation. Diameter coverage ranges from DN15 to DN2000, pressure ratings include PN10, PN16, PN25, PN40, PN63, PN100, etc., materials can be selected from carbon steel, stainless steel, alloy steel, and duplex steel, and forming processes include seamless hot pushing, steel plate roll welding, and forging. Before leaving the factory, treatments such as sandblasting and rust removal, pickling and passivation, and anti-corrosion coating can be performed as needed. We serve domestic engineering general contractors, petrochemical and chemical EPC, power and energy infrastructure, municipal heating and gas construction enterprises, as well as pipeline and fitting wholesalers and foreign trade export supporting customers.
| Product Name | GB Reducer |
| Product Categories | Reducer |
| Customization | The factory has full-dimensional special customization capability for the national standard system, has been deeply engaged in national standard pipeline processes for many years, is proficient in the full set of parameter specifications of GB/T12459 and GB/T13401, and undertakes various national standard non-standard upgrade and special working condition customization orders. Dimensional customization can produce national standard non-standard reducing drop, extended national standard straight pipe sections, non-standard total length, and special eccentricity reducers as needed, adapting to old national standard pipeline network renovation and new-old equipment national standard interface connection projects. Wall thickness customization can perform thickening for high pressure and wear-resistant reinforcement on the basis of national standards, keeping the basic national standard dimensions unchanged and improving pressure resistance and wear resistance. Material customization can switch the full range of compliant materials under national standards as needed, meeting differentiated working conditions in municipal, chemical, power, and high-temperature and high-pressure applications. Process customization supports national standard sandblasting and rust removal, black paint anti- |
| MOQ | National standard reducer adopts an accessible and flexible tiered MOQ mechanism, adapting to diverse procurement scenarios including sporadic supplementary orders for domestic engineering, small-batch purchases at construction sites, dealer distribution stocking, large-scale centralized engineering procurement, and foreign trade national standard orders. DN15–DN600 conventional national standard concentric and eccentric mainstream specifications, 20#, Q235B, 304 general-purpose materials, PN16/PN25 commonly used pressure, etc. |
| Lead Time | Relying on standardized national standard pipe fitting production lines, a full-specification in-stock warehousing system, and mature mass-production processes, national standard reducers provide extremely fast, stable, and zero-delay tiered delivery services for engineering, precisely matching domestic construction site schedules, project rush timelines, and foreign trade shipping schedule milestones. DN15–DN600 conventional national standard carbon steel and stainless steel general-purpose in-stock specifications, with massive inventory year-round, standard orders within 3 working days |
| Packaging | National standard reducers adopt standardized protective packaging suitable for both national standard engineering and foreign trade, accommodating the dual needs of domestic construction site transportation and stacking as well as cross-border sea freight export, effectively preventing rust, impact damage, bevel damage, and transportation deformation. For small DN15–DN100 national standard specifications, plastic protective rings are installed on pipe ends to protect welding bevels, the entire body is sprayed with anti-rust oil, wrapped with anti-rust paper and waterproof PE film, and the outer layer is sealed in wear-resistant woven bags, eliminating transportation rust and precision bevel wear. For medium DN125–DN600 conventional national standard pipe fittings, they are neatly stacked on fumigation-free solid wood pallets, integrally wrapped with waterproof film, and secured with steel straps locked tightly to prevent slipping, preventing stacking displacement and impact damage, adapting to mechanized loading/unloading at construction sites and orderly container stuffing. For large DN600 and above large-diameter national standard rolled |
| Reference Price | Inquiry |
| Standard | GB/T 12459, GB/T 13401 |
We adopt a flexible tiered MOQ mechanism. For DN15–DN600 conventional national standard concentric and eccentric mainstream specifications, 20#, Q235B, 304 general-purpose materials, and PN16/PN25 commonly used pressure ratings, small-batch procurement is available, suitable for sporadic replenishment orders for domestic projects, small-batch procurement at construction sites, and stocking by distributors; large-batch project centralized procurement and foreign trade national standard orders can also be undertaken, and the specific minimum order quantity should be confirmed by contacting us. Conventional carbon steel and stainless steel general-purpose stock specifications of DN15–DN600 are kept in stock year-round, and standard orders can be delivered within 3 working days; the delivery time for other specifications and customized orders is confirmed according to the production scheduling situation. Packaging is carried out in accordance with standardized protection commonly used for national standard engineering and foreign trade, with small, medium, and large specifications using protective rings, pallets, square timber supports, and other protection methods respectively. Products are affixed with bilingual Chinese-English labels indicating the execution standard, specifications, material, pressure, batch, and heat number information, facilitating warehouse acceptance, long-term storage, and cross-border customs clearance.
Before sales, we can assist with selection according to the project's national standard grade, working condition medium, pressure and temperature, and installation method, helping to distinguish between concentric and eccentric structures, pressure ratings, and suitable materials. During sales, we synchronize production, quality inspection, and testing data, support online inspection, on-site supervision, and third-party national standard testing, and the entire order is traceable. After sales, we provide an 18-month warranty. During the warranty period, for non-human installation issues causing national standard parameter nonconformity, process defects, leakage and deformation, or substandard materials, we will remake and reship free of charge and bear the logistics and production costs. We provide lifetime free national standard pipeline technical support, answering technical questions within 24 hours on installation and welding, national standard adaptation, engineering acceptance, pipeline network renovation, and other issues. In terms of customization, we can undertake needs such as non-standard reducer drop, extended straight pipe sections, non-standard total length, special eccentricity, thickened high pressure, wear-resistant reinforcement, and 1:1 replication according to drawings or old parts, with a sampling period of 3–5 days.
Small and medium diameter seamless reducers implement GB/T 12459, and large diameter rolled reducers implement GB/T 13401. The dimensions, wall thickness, tolerances, and bevels of the entire series are aligned with national standards, facilitating engineering acceptance.
For vertical pipelines, vertical equipment, and gas-phase media, concentric type is generally selected; for horizontal pipelines, liquid-phase media, and working conditions requiring prevention of gas accumulation, liquid accumulation, and cavitation, eccentric type is generally selected. For specific selection, please contact us, and we will assist in confirming according to the project working conditions.
Yes. The national standard Series I universal outer diameter can be adapted to the pipeline systems of multiple countries. We can provide a full set of English qualification documents, and packaging is also carried out in accordance with cross-border ocean export requirements.
For conventional national standard carbon steel and stainless steel universal in-stock specifications from DN15–DN600, standard orders can be delivered within 3 working days. For other specifications and customized orders, please contact us to confirm the delivery time.
We adopt a flexible tiered MOQ mechanism. For conventional specifications from DN15–DN600, general materials of 20#/Q235B/304, and commonly used pressure ratings of PN16/PN25, small-batch procurement is possible. For the specific minimum order quantity, please contact us to confirm.
The warranty period is 18 months. During the warranty period, for non-human installation issues that result in non-compliance with national standard parameters, process defects, leakage or deformation, or substandard materials, we will remake and reship free of charge and bear the logistics and production costs.
Yes. We can undertake customization such as non-standard reducing drop, extended straight pipe section, non-standard total length, special eccentricity, thickened high pressure, wear-resistant reinforcement, etc. We can also replicate 1:1 according to national standard drawings or old parts, with a sampling cycle of 3 to 5 days.
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