Alloy steel reducing pipe, also known as alloy concentric/eccentric reducer, is a variable-diameter pipe fitting connecting different pipe diameters in industrial piping systems, and is divided into two structures: concentric and eccentric. Concentric reducers are mostly used for vertical pipes and vertical equipment interfaces, with the medium conveyed in the center; eccentric reducers are used for horizontal pipes, with one side generatrix flush, which helps reduce gas and liquid accumulation in horizontal pipelines. The product diameter range covers DN15–DN2000, and it is produced in accordance with ASME B16.9, GB/T12459, DIN, EN, GOST, and JIS standards, adapting to SCH40, SCH80, SCH160, and XXS wall thickness grades. Mainstream materials include heat-resistant and high-pressure alloy grades such as 15CrMo, 12Cr1MoV, Cr5Mo, P11, P12, P22, P91, and 16Mn/Q345B. Compared with carbon steel reducers, alloy steel material has better creep resistance and thermal fatigue resistance under high-temperature and high-pressure environments; compared with stainless steel reducers, it focuses more on high-temperature heat resistance and high-pressure load bearing. The products are aimed at pipeline new construction and renovation projects in fields such as thermal power and cogeneration, petrochemical refining, and boiler thermal power. For specific specifications, materials, and quantity requirements, please contact us for confirmation.
- Using chrome-molybdenum alloy and low-alloy heat-resistant steel as the base material, it is suitable for high-temperature and high-pressure working conditions, and differs from carbon steel reducers in creep resistance and thermal fatigue resistance.
- Concentric and eccentric structures are available. Concentric is used for vertical pipelines and vertical equipment interfaces, while eccentric is used for horizontal pipelines to reduce gas and liquid accumulation.
- The diameter range covers DN15–DN2000, adapting to SCH40, SCH80, SCH160, and XXS wall thickness grades, and specific specifications can be confirmed according to project requirements.
- Produced in accordance with multiple national standards including ASME B16.9, GB/T12459, DIN, EN, GOST, and JIS, adapting to the standard requirements of overseas projects.
- Materials cover grades such as 15CrMo, 12Cr1MoV, Cr5Mo, P11, P12, P22, P91, and 16Mn/Q345B, and can be selected according to working conditions.
- Supports customization for non-standard sizes, special eccentricity, extended straight pipe sections, special bevels, etc., and can be replicated 1:1 according to drawings or old parts.
- Sampling lead time is 3–5 days, and delivery time for bulk orders is confirmed according to project requirements.
| Product Name | Alloy Steel Reducer |
| Product Categories | Reducer |
| Customization | The factory possesses full-dimensional high-end high-pressure alloy steel reducer precision customization capabilities, is proficient in global high-temperature, high-pressure, hydrogen-service, and creep-resistant heavy-industry special working condition standards, and undertakes various high-pressure non-standard customization orders. For dimensional customization, it can produce arbitrary non-standard reducing drops, extended high-pressure straight pipe sections, non-standard overall lengths, special eccentricities, and special-shaped high-pressure transition structures, suitable for the special interface renovation of overseas old heavy-industry high-pressure pipeline networks and imported high-end power equipment. For wall thickness, it can customize SCH ultra-thick high-pressure, locally thickened pressure-resistant, and heavy-load reinforced structures, suitable for ultra-high-pressure extreme load working conditions. For materials, it can customize on demand the entire series of 15CrMo, 12Cr1MoV, Cr5Mo, P11, P12, P22, P91 heat-resistant high-pressure alloys and low-alloy high-strength steels. For processes, it supports integral forging |
| MOQ | Alloy steel reducers adopt a heavy-industry high-pressure flexible tiered MOQ mechanism, suitable for diverse procurement scenarios including foreign trade high-pressure sample orders, heavy-industry project supplementary orders, overseas high-end warehouse stocking, and EPC heavy-industry large-volume centralized procurement. For DN15–DN600 conventional 15CrMo, 12Cr1MoV, 16Mn low-alloy, standard thick-wall, concentric and eccentric mainstream stock specifications, the minimum order quantity |
| Lead Time | Relying on dedicated high-pressure alloy production lines, forging and heat treatment equipment, and a high-end pipe fittings stock warehousing system, alloy steel reducers provide heavy-industry precision stable tiered delivery services, suitable for the stringent schedule milestones of global power station and refining high-end high-pressure projects. DN15–DN600 conventional 15CrMo, 12Cr1MoV, 16Mn material standard wall thickness seamless high-pressure reducers, |
| Packaging | Alloy steel reducers adopt heavy-industry high-pressure foreign trade reinforced dedicated packaging, and in response to the characteristics of thick-wall heavy pipe fittings, high-pressure precision bevels, and heavy-industry export transportation, provide all-round protection against impact, bevel damage, rust corrosion, and transportation deformation. For small DN15–DN100 high-pressure alloy reducers, high-strength plastic protective rings are installed at the pipe ends to protect the bevels, the entire body is sprayed with high-pressure dedicated anti-rust oil, wrapped with anti-rust paper and waterproof PE film, and the outer layer is double-layer sealed with wear-resistant woven bags, completely preventing seawater corrosion and precision bevel wear. For medium DN125–DN600 conventional high-pressure specifications, they are neatly stacked on fumigation-free solid wood pallets, integrally wrapped with waterproof film, and secured with steel straps for anti-slip fixation, preventing displacement and impact during container stacking, suitable for mechanized loading and unloading in overseas heavy-industry warehousing. For large DN60 |
| Reference Price | Inquiry |
| Brand | Guojie |
Applications
- Reducer connections for thermal power plant boiler steam pipeline networks, steam turbine power pipelines, and cogeneration high-temperature high-pressure transmission systems
- Pipe diameter transitions for refinery hydrogen-service process pipeline networks, hydrogenation unit reducing systems, and high-temperature high-pressure oil and gas transmission pipelines
- Inlet and outlet reducer matching for large boiler equipment pipelines and high-temperature high-pressure power units
- Pipeline new construction and renovation projects of overseas thermal power and cogeneration EPC general contractors and petrochemical refining engineering contractors
- Batch supporting procurement for boiler equipment manufacturing plants, thermal power complete equipment suppliers, and high-pressure fluid unit enterprises
- Customized replacement of non-standard reducing drop, special eccentricity, and special-shaped transition structures in the renovation of old high-pressure pipeline networks
Procurement & Delivery
Alloy steel reducers are scheduled according to orders. For conventional material and wall thickness specifications from DN15–DN600, please contact us to confirm stock availability. Packaging is graded by specification: DN15–DN100 pipe ends are fitted with plastic protective rings, sprayed with anti-rust oil, wrapped in anti-rust paper and waterproof PE film, with an outer woven bag; DN125–DN600 are placed on fumigation-free solid wood pallets, wrapped with waterproof film and secured with steel straps; sizes above DN600 use thickened solid wood closed wooden boxes, with internal square wood positioning and shock-absorbing filling. All products are affixed with bilingual Chinese-English labels indicating material, pressure rating, wall thickness, standard, heat number, and batch information. For minimum order quantity and specific delivery time, please contact us to confirm, and we will assist with quotation based on specification, material, and quantity.
Service & Support
Before sales, engineers assist in matching material and concentric/eccentric structure according to medium temperature, working pressure, hydrogen service conditions, and frequency of alternating hot and cold. During order execution, forging, heat treatment, flaw detection, and quality inspection data can be synchronized, and remote factory audits and third-party supervision are supported. After sales, an 18-month warranty is provided. During the warranty period, for material non-compliance, leakage, or process defects caused by non-human installation issues, we are responsible for remanufacturing and replacement and bear cross-border logistics and production costs. At the same time, we provide technical support in pipeline installation, welding, heat treatment maintenance, and overseas acceptance specifications, with bilingual Chinese-English answers.
FAQ
What is the difference between alloy steel reducers and carbon steel and stainless steel reducers?
Alloy steel reducers add chromium-molybdenum heat-resistant alloy elements and are designed in a targeted way for high-temperature resistance, high-pressure resistance, creep resistance, and thermal fatigue resistance, making them suitable for high-temperature and high-pressure working conditions such as power stations and refining and chemical industries. Carbon steel reducers are usually used for normal-temperature and low-pressure pipelines, while stainless steel reducers focus on corrosion resistance. In high-temperature and high-pressure scenarios, carbon steel and stainless steel pipe fittings cannot replace the heat resistance and creep resistance of alloy steel.
How to choose different alloy materials?
For conventional high-temperature steam pipelines, 15CrMo or 12Cr1MoV can be selected; for hydrogen service refining and chemical working conditions, Cr5Mo or P22 can be considered; for ultra-high-pressure and ultra-high-temperature power station working conditions, P91 can be selected. The specific selection needs to be combined with medium temperature, working pressure, hydrogen service conditions, and frequency of alternating hot and cold. Please contact us, and engineers will assist in confirming the material plan.
Where are concentric and eccentric reducers used respectively?
Concentric reducers are mostly used in vertical pipelines and vertical equipment connections, where the medium is conveyed centrally and the flow is stable. Eccentric reducers are used in horizontal pipelines, with one side of the generatrix kept flush, which helps reduce gas accumulation, liquid accumulation, and medium retention in horizontal pipelines. When selecting a model, please provide the pipeline routing and medium condition, and we can assist in confirming which structure to use.
Can non-standard reducers be customized according to drawings or old parts?
Yes. We support customization of non-standard diameter reduction drop, extended straight pipe sections, non-standard total length, special eccentricity, special-shaped transition structures, special bevels, and non-standard end faces, and can also perform 1:1 replication according to overseas drawings or old parts. Materials can cover the full range of 15CrMo, 12Cr1MoV, Cr5Mo, P11, P12, P22, P91 heat-resistant high-pressure alloys and low-alloy high-strength steels. The sample-making cycle is 3–5 days; please provide drawings or old-part dimensions so that we can evaluate.
How are the minimum order quantity and delivery time confirmed?
We adopt a tiered MOQ mechanism, suitable for different procurement scenarios such as sample orders, project replenishment orders, and bulk centralized procurement. For DN15–DN600 conventional materials and wall thickness specifications, please contact us to confirm stock availability. For the specific minimum order quantity and delivery time, please provide the specifications, materials, quantity, and applicable standards, and we will assist in confirming according to the production scheduling situation.
Can export packaging meet sea transportation and customs clearance requirements?
Packaging is handled in tiers according to specifications: small-diameter pipe ends are fitted with protective rings and treated for rust prevention, medium-diameter products use fumigation-free solid wood pallets and steel straps for fixation, and large-diameter products use thickened solid wood closed wooden crates. All products are affixed with bilingual Chinese-English labels indicating material, pressure rating, wall thickness, standard, heat number, and batch information, facilitating warehouse acceptance and cross-border customs clearance for overseas projects.
