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A stainless steel eccentric reducer is a pipe fitting designed to join two pipes of different diameters, with the centerlines of each end offset from one another. This offset, known as the eccentricity, means one side of the fitting is straight while the other tapers at an angle. Unlike concentric reducers, which are symmetrical, the eccentric design helps control fluid flow, reduce turbulence, and prevent the accumulation of gas or air pockets in piping systems. It is commonly used where maintaining a consistent bottom or top pipe level is important.

Stainless Steel Eccentric Reducer Specification

Standard: ASME/ANSI B16.9, B36.19

Size: 3/4″ to 48″

Thickness: Sch 10S, 20, STD, 40S, XS, 80S, 100, 120, 140, 160

Technical: Seamless and Weld Eccentric Reducer

Surface: Pickling and Solution Heat Treatment.

Materials of Stainless Steel Eccentric Reducers:

Stainless Steel	304, 304L, 304H, 310s, 316, 316L, 317L, 321, 347, 904L, 410, 446 etc.
Carbon Steel	WPB, WPC, WPL6, WPHY42, WPHY46, WPHY52, WPHY56, WPHY60, WPHY65 etc.
Alloy Steel	WP5, WP9, WP11, WP22, WP91, 4140, Class 1, 2, 3 etc.
Duplex and Super Duplex	UNS N031803, UNS N032750, UNS N032760 etc.
Inconel	600, 601, 625, 718, UNS N06600, UNS N06601, UNS N06625, UNS N07718 etc.
Incoloy	800, 800H, 800HT, 825, UNS N08800, UNS N08810, UNS N08811, UNS N08825 etc.
Monel	400, UNS N04400 etc.
Hastelloy	C276, C22, UNS N010276, UNS N06022 etc.
Titanium	Grade 2, Grade 3, UNS R50400, UNS R56200 etc.
Copper Nickel	90/10, 70/30, UNS C71500, UNS C70600 etc.
Other	Alloy 20, SMO 254, UNS N08020, UNS N031254 etc.

How to Calculate Weight of Eccentric Reducer

0.02466 × S ×[ (D+d)/2-S] × H / 1000

S: Wall thickness

D: Outside diameter of the larger end

d: Outside diameter of the small end

H: End to end dimension

Features of Stainless Steel Eccentric Reducers

High Corrosion Resistance: Made from stainless steel, it effectively resists corrosion from various media such as acids, alkalis, and salts, making it particularly suitable for industries like chemicals, food processing, and pharmaceuticals.

Easy Installation: Typically connected to pipes via welding, it offers simple installation and reliable connections.

Compact structure: The eccentric design provides advantages in pipeline systems with limited space.

Fluid control: Eccentric reducers can help adjust the flow direction of fluids within pipelines, reduce turbulence, and ensure smooth fluid passage.

ASTM A403 Butt Weld Eccentric Reducer Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu
ASTM A403 WP304	MIN						8	18
	MAX	0.08	2	0.045	0.03	1	11	20
ASTM A403 WP316	MIN						10	16	2
	MAX	0.08	2	0.045	0.03	1	14	18	3
ASTM A403 WP317	MIN						11	18	3
	MAX	0.08	2	0.05	0.03	1	15	20	4
ASTM A403 WP321	MIN						9	17
	MAX	0.08	2	0.045	0.03	1	12	19
ASTM A403 WP904L	MIN						23	19	4		1
	MAX	0.02	2	0.045	0.035	1	28	23	5	0.1	2

ASTM A403 Butt Weld Eccentric Reducer Mechanical Property

MATERIAL	ASTM A403 WP304	ASTM A403 WP316	ASTM A403 WP317	ASTM A403 WP321	ASTM A403 WP904L
T.S (MPA)	515 min	515 min	515min	515 min	490 min
Y.S (MPA)	205 min	205 min	205min	205 min	220 min
EL %	28 min	28 min	28min	28 min	28 min

ASME B16.9 Eccentric Reducer Dimensions

OD1	OD2	END TO END
NPS	NPS	H
3/4	3/8 – 1/2	38
1	1/2 – 3/4	51
1 1/4	1/2 – 1	51
1 1/2	1/2 – 1 1/4	64
2	3/4 – 1 1/2	76
2 1/2	1 – 2	89
3	1 1/4 – 2 1/2	102
4	2 – 3 1/2	102
5	2 – 4	127
6	2 1/2 – 5	140
8	3 1/2 – 6	152
10	4 – 8	178
12	5 – 10	203
14	6 – 12	330
16	6 – 14	356
18	8 – 16	381
20	10 – 18	508
22	12 – 20	508
24	12 – 22	508
26	12 – 24	610
28	14 – 26	610
30	14 – 28	610
32	20 – 30	610
34	22 – 32	610
36	22 – 34	610
38	24 – 36	610
40	28 – 38	610
42	28 – 40	610
44	32 – 42	610
46	34 – 44	711
48	36 – 46	711
52	40 – 48	711
56	40 – 52	711
60	44 – 56	711

ASME B16.9 Eccentric Reducer Weight

Eccentric Reducer Weight Chart in kg
Nominal Size		SCH20	STD	SCH40	SCH80	SCH120	SCH160
DN	NPS
15	1/2		0.08	0.08	0.1
20	3/4		0.17	0.17	0.2
25	1		0.21	0.21	0.25		0.22
32	1 1/4		0.29	0.29	0.35
40	1 1/2		0.42	0.42	0.58		0.6
50	2		0.8	0.8	1.03		1.04
65	2 1/2		1.05	1.05	1.42		1.65
80	3		136	1.36	1.9
90	3 1/2		1.63	1.63	2.27		2.4
100	4		2.77	2.77	3.93		4.4
125	5		3.96	3.96	6		7.14
150	6		6.31	6.31	9.26		10.8
200	8	7.85	10.7	10.7	17.5	15	18.4
250	10	11.2	15.8	16.3	25.1	25.1	32.5
300	12	25.6	28.8	32.1	56.5	41.7	53.3
350	14	30.5	38.5	48.8	79	84.5	106
400	16	35.2	44.5	64.3	102	112	143
450	18	62.7	62.7	98.5	165
500	20	72.6	72.6		181
550	22	97	79.1	142	226
600	24	130	100

Surface Treatment

• Mechanical Polishing

A widely used method that smooths and brightens the stainless steel surface by grinding and polishing it with sanding belts, polishing wheels, and similar tools.

• Acid Washing and Passivation

A chemical process that removes iron particles and oxide scale through acid washing. This is followed by passivation, which forms a dense, protective film on the surface to improve corrosion resistance.

• Electrolytic Polishing

An electrochemical technique where stainless steel serves as the anode and is polished in an electrolyte solution, resulting in a smooth, reflective finish.

• Sandblasting

A process where fine abrasive materials—such as glass beads or aluminum oxide—are blasted at high speed onto the stainless steel surface to produce a consistent matte or textured appearance.

Applications

Chemical and petrochemical industries

Food and beverage processing

Pharmaceutical industry

Water treatment and desalination

Oil and gas transportation

Pulp and paper and sugar industries

Marine and offshore engineering

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

12 8 月, 2025