Stamping eccentric reducer (also known as eccentric reducer) is a type of pipe variable diameter connector formed through stamping process, with the centers of the two ends of the pipe not on the same straight line. It is designed to achieve eccentric variable diameter connection of pipes with different diameters and is widely used in industrial pipeline systems such as petroleum, chemical, pharmaceutical, food, and environmental dust removal.

1、 Product Features

Eccentric structure, suitable for special installation scenarios: Adopting an eccentric design, one side remains flat (top or bottom), making it easy to stick to walls, floors, or lay along equipment, optimizing spatial layout, and avoiding gas accumulation or impurity deposition.

One time stamping forming, high strength: seamless connection is achieved through cold/hot stamping process, continuous metal flow lines, no weak points in welds, excellent tensile strength and fatigue resistance, suitable for medium and high pressure working conditions.

Accurate fluid control:

Top flat type: used for gas or steam pipelines to prevent the formation of air pockets at the top;

Bottom flat type: used for fluids containing liquid or impurities, facilitating low point drainage and avoiding blockage.

High dimensional accuracy: The mold molding ensures that the outer diameter, wall thickness, and length tolerances are controlled within ± 0.5mm, and the end face parallelism is high, which is conducive to on-site butt welding installation.

There are various connection methods: mainly butt welding connection, but can also be customized with socket welding, thread or compression structure, suitable for different pipes and construction conditions.

Material diversity and adaptability support customization of various materials, including carbon steel (Q235, 20 #), alloy steel, austenitic stainless steel, duplex steel, titanium alloy, Hastelloy, Monel, Inconel, and special metal customization.

Stainless steel stamped fittings have excellent corrosion resistance and are widely used in industries such as chemical, food, and pharmaceutical; Carbon steel pipe fittings are economical and practical, and are the preferred choice for municipal engineering and ordinary industrial pipelines; Alloy steel pipe fittings can meet the requirements of special working conditions such as high temperature and high pressure.

2、 Execution standards

national standard:

GB/T 12459-2017 "Steel butt welded seamless fittings"

GB/T 13401-2017 "Welded Steel Pipe Fittings"

Industry standards:

SH/T 3408-2021 "Steel butt welded fittings for petrochemical industry"

HG/T 21634-2022 "Reducing Pipes for Chemical Pipelines"

International standards:

ASME B16.9 (American standard butt welded pipe fittings)

DIN 2616‌（德标异径管）

ISO 3419‌（国际通用对焊管件规范）

所有产品需通过无损检测（如RT、UT）和1.5倍工作压力水压试验，确保符合安全与质量要求。

3、 Size specifications

 注：标注方式为“DN大端×小端”，如DN100×80表示大端DN100、小端DN80；弯曲长度通常为‌1.5D~2.0D‌（D为大端直径），保证流体平稳过渡。

四、压力等级

公称压力范围‌：PN1.0MPa ~ PN420MPa（Sch5s ~ XXS）

常见等级对应‌：

Sch40‌：适用于PN1.6~2.5MPa，常规工业与建筑系统

Sch80/XS‌：适用于PN4.0~10.0MPa，高压蒸汽、石油管线

XXS‌：适用于PN10.0MPa以上或强腐蚀环境，如核电、深海管道

耐温范围‌：

碳钢：-20℃ ~ +400℃

不锈钢：-40℃ ~ +600℃

合金钢：可达+650℃（如15CrMo）

实际选型应结合设计压力、温度、介质特性（如是否含气、含固、腐蚀性），依据‌ASME B31.3‌或‌GB 50316‌进行强度校核，确保系统长期安全运行。