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Stainless Steel Reducing Elbow

Stainless steel reducing elbow, also known as reducing butt welding elbow and reducing elbow, is a kind of elbow fitting with different cross-sectional radius at both ends. It is mainly used to connect two sections of pipes with different end face radius, or to change the pipe diameter. The connection form of reducing butt welding elbow is butt welding, that is, the elbow is directly welded to the steel pipe. This connection method has the characteristics of high strength and good sealing.

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Size Range

2″~24″ (DN50~DN600)

Pressure Level

3mm – 40mm / SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS

Material Grades

304/304L, 316/316L, 316Ti, 321, 317L, S31803, S31254, S32750, S32760, A234 WPB, 20#, etc.

Manufacturing Processes

Sawing, hot pressing, cold processing, hot processing, welding, heat treatment

Product Standards

ASME B16.9, GB/T12459, GB/T13401, GB/T10752, SH3408, SH3409, HG/T21631, HG/T21635, SY/T0510, JIS2311/2312/2313, DL/T695, EN 10253, etc.

Technical Specifications & Dimensions

stainless steel reducing elbow dimension

Nominal Size		Outside Diameter at Bevel				Center to End A	Nominal Size		Outside Diameter at Bevel				Center to End A
Nominal Size		Large End		Small End			Nominal Size		Large End		Small End
DN	NPS	A Series	B Series	A Series	B Series		DN	NPS	A Series	B Series	A Series	B Series
50×40	2×1½	60.3	57	48.3	45	76	250×200	10×8	273.0	273	219.1	219	381
50×32	2×1¼	60.3	57	42.4	38	76	250×150	10×6	273.0	273	168.3	159	381
50×25	2×1	60.3	57	33.7	32	76	250×125	10×5	273.0	273	141.3	133	381
65×50	2½×2	73.0	76.0	60.3	57	95	300×250	12×10	323.9	273	273.0	273	457
65×40	2½×1½	73.0	76.0	48.3	45	95	300×200	12×8	323.9	325	219.1	219	457
65×32	2½×1¼	73.0	76.0	42.4	38	95	300×150	12×6	323.9	325	168.3	159	457
80×65	3×2½	88.9	89	73.0	76.0	114	350×300	14×12	355.6	377	323.9	325	533
80×50	3×2	88.9	89	60.3	57	114	350×250	14×10	355.6	377	273.0	273	533
80×40	3×1½	88.9	89	48.3	42	114	350×200	14×8	355.6	377	219.1	219	533
90×80	3½×3	101.6	---	88.9	---	133	400×350	16×14	406.4	426	355.6	377	610
90×65	3½×2½	101.6	---	73.0	---	133	400×300	16×12	406.4	426	323.9	325	610
90×50	3½×2	101.6	---	60.3	---	133	400×250	16×10	406.4	426	273.0	273	610
100×90	4×3½	114.3	---	101.6	---	152	450×400	18×16	457	480	406.4	426	686
100×80	4×3	114.3	108	88.9	89	152	450×350	18×14	457	480	355.6	377	686
100×65	4×2½	114.3	108	73.0	76.0	152	450×300	18×12	457	480	323.9	325	686
100×50	4×2	114.3	108	60.3	57	152	450×250	18×10	457	480	273.0	273	686
125×100	5×4	141.3	133	114.3	108	190	500×450	20×18	508	530	457.0	480	762
125×90	5×3½	141.3	---	101.6	---	190	500×400	20×16	508	530	406.4	426	762
125×80	5×3	141.3	133	88.9	89	190	500×350	20×14	508	530	355.6	377	762
125×65	5×2½	141.3	133	73.0	76.0	190	500×300	20×12	508	530	323.9	325	762
150×125	6×5	168.3	159	141.3	133	229	500×250	20×10	508	530	273.0	273	762
150×100	6×4	168.3	159	114.3	108	229	600×550	24×22	610	---	559.0	---	914
150×90	6×3½	168.3	---	101.6	---	229	600×500	24×20	610	630	508.0	530	914
150×80	6×3	168.3	159	88.9	89	229	600×450	24×18	610	630	457.0	480	914
200×150	8×6	219.1	219	168.3	159	305	600×400	24×16	610	630	406.4	426	914
200×125	8×5	219.1	219	141.3	133	305	600×350	24×14	610	630	355.6	377	914
200×100	8×4	219.1	219	114.3	108	305	600×300	24×12	610	630	323.9	325	914

What Are The Main Uses Of Reducing Butt Welding Elbows?

Industrial pipeline system: In many industrial fields such as petrochemical, electric power, metallurgy, etc., reducing butt welding elbows are widely used to connect pipelines of different diameters, realize the turning and diameter adaptation of pipelines in the process flow, and ensure that materials (such as oil, natural gas, steam, various chemical raw materials, etc.) can be smoothly transmitted in the pipeline.

Building water supply and drainage and heating system: In the field of construction, it can be used to connect water supply pipes, drainage pipes and heating pipes of different diameters, making the pipeline layout of the entire system more reasonable and smooth, meeting the requirements of pipeline diameter and direction for different areas and different water or heating equipment in the building.

How Do We Produce Top-quality Butt Weld Reducing Elbow?

Material preparation

Material selection: Select suitable materials such as carbon steel, stainless steel, and alloy steel according to design requirements and working environment.

Inspection: Perform chemical composition analysis and mechanical property test on the selected materials to ensure that the quality meets the standards.

Forming

Cutting: Use cutting equipment to cut the pipe into appropriate lengths according to the specifications of the elbow.

Hot push: Heat the cut pipe to the appropriate temperature, put it into the push machine for push forming, and bend it into the required elbow shape under the extrusion of the mold.

Shaping: Shape the elbow after pushing, and adjust it several times until the size and shape meet the design requirements.

Welding

Bevel treatment: Open a groove at the connection between the elbow and the pipe. The shape and size of the groove are selected according to the welding method and material properties.

Welding: Connect the elbow and the pipe by butt welding. Control the current, voltage, and welding speed during welding to ensure the quality and strength of the weld.

Weld inspection: Perform visual inspection, non-destructive testing (such as X-ray, ultrasonic testing), and mechanical property testing on the weld to ensure that the weld quality meets the standards.

Heat treatment

According to the material characteristics and design requirements, the elbow after welding is heat treated. The main purpose is to eliminate welding stress and improve the mechanical properties and corrosion resistance of the material. Common methods include annealing, normalizing, quenching and tempering.

Inspection and testing

Dimension inspection: Use measuring tools to inspect the dimensions of the elbow to ensure that it meets the design requirements.

Pressure test: Perform pressure test on the elbow to check its ability to withstand pressure. During the test, the pressure needs to be gradually increased, and the deformation and leakage of the elbow need to be observed.

Other tests: According to the design requirements and working environment, other tests may also be required, such as corrosion resistance test, fatigue performance test, etc.

Surface treatment

Rust removal and cleaning: The elbows are rust-removed and cleaned to remove impurities such as oxides and oil stains on the surface.

Anti-corrosion treatment: The elbows are treated with anti-corrosion according to the requirements of the working environment. Common anti-corrosion methods include painting, hot-dip galvanizing, etc.

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