Product Overview

Steel concentric reducer is a pipe fitting used to connect pipes of different diameters in a piping system. Its two ends share a common centerline, featuring a concentric structure. It is primarily used in pipeline systems transporting liquid or gaseous media, ensuring smooth flow of the medium and stable pipe connections. Used in industries such as petroleum, chemical engineering, power generation, shipbuilding, municipal engineering, fire protection systems, and mechanical equipment manufacturing, the concentric reducer is suitable for piping connections in valves, pump rooms, heat exchangers, boilers, storage tanks, and other equipment. It offers excellent pressure resistance, temperature tolerance, and erosion resistance, meeting the requirements for pipe diameter transitions under diverse operating conditions.

Product Parameters

Parameter	Range / Details
Execution Criterion	ASME B16.9; GOST 17378; DIN2616;
Specification Range	GOST: 21.3mm-1016mm; DN15-DN1200;
Wall Thickness Class	SCH10/20/40/80/160; XXS, GOST, DIN, etc.
Connection Type	Butt-Welding
Surface Treatment	Bare surface, paint, anti-erosion paint, hot-dip galvanizing
Carbon Steel Material	ct20, A234 WPB, P235GH, P265GH, P355NH, ST35.8, ST37.2
Stainless Steel Material	304/304L, 316/316L, 321; 12Х18Н10Т, 08X18H10, 08X17H13M2T;
Alloy Steel Material	A234 WP11, WP22, WP12, WP5, WP9, WP91, WB36, 15XM, 10Cr9Mo1VNbN
Packaging Method	Wooden crate; wooden pallet.
Supply Capacity	1000 tons/month

ASME B16.9-2024
Dimensions of Concentric Reducers

product-430-318

Nominal Pipe Size (NPS)	Outside Diameter at Bevel (mm)		End-to-End H (mm)	Nominal Pipe Size (NPS)	Outside Diameter at Bevel (mm)		End-to-End H (mm)
Nominal Pipe Size (NPS)	Large End	Small End	End-to-End H (mm)	Nominal Pipe Size (NPS)	Large End	Small End	End-to-End H (mm)
3/4x1/2	26.7	21.3	38.1	8x6	219.1	168.3	152.4
3/4x3/8		17.3		8x5		141.3
1x3/4	33.4	26.7	50.8	8x4		114.3
1x1/2		21.3		8x3-1/2		101.6
1-1/4x1	42.2	33.4	50.8	8x3		88.9
1-1/4x3/4		26.7		8x2-1/2		73.0
1-1/4x1/2		21.3		10x8	273.1	29.1	177.8
1-1/2x1-1/4	48.3	42.2	63.5	10x6		168.3
1-1/2x1		33.4		10x5		141.3
1-1/2x3/4		26.7		10x4		114.3
1-1/2x1/2		21.3		12x10	323.9	273.1	203.2
2x1-1/2	60.3	48.3	76.2	12x8		219.1
2x1-1/4		42.2		12x6		168.3
2x1		33.4		12x5		141.3
2x3/4		26.7		14x12	355.6	323.9	330.2
2-1/2x2	73.0	60.3	88.9	14x10		273.1
2-1/2x1-1/2		48.3		14x8		219.1
2-1/2x1-1/4		42.2		14x6		168.3
2-1/2x1		33.4		16x14	406.4	355.6	355.6
3x2-1/2	88.9	73.0	88.9	16x12		323.9
3x2		60.3		16x10		273.1
3x1-1/2		48.3		16x8		219.1
3x1-1/4		42.2		18x16	457.2	406.4	381.0
3-1/2x3	101.6	88.9	101.6	18x14		355.6
3-1/2x2-1/2		73.0		18x12		323.9
3-1/2x2		60.3		18x10		273.1
3-1/2x1-1/2		48.3		18x8		219.1
3-1/2x1-1/4		42.2		20x18	508.0	457.2	508.0
4x3-1/2	114.3	101.6	101.6	20x16		406.4
4x3		88.9		20x14		355.6
4x2-1/2		73.0		20x12		323.9
4x2		60.3		20x10		273.0
4x1-1/2		48.3		22x20	558.8	508.0	508.0
5x4	141.3	114.3	127.0	22x18		457.2
5x3-1/2		101.6		22x16		406.4
5x3		88.9		22x14		355.6
5x2-1/2		73.0		22x12		323.8
5x2		60.3		24x22	609.6	558.8	508.0
6x5	168.3	141.3	139.7	24x20		508.0
6x4		114.3		24x18		457.2
6x3-1/2		101.6		24x16		406.4
6x3		88.9		24x16		355.6
6x2-1/2		73.0		24x16		323.8

Product Advantages

Comprehensive Criterions, Wide Applicability

Compliant with ASME, GOST, DIN and other international criterions, meeting American, Russian, and German criterion system requirements. Suitable for global petroleum, natural gas, and chemical engineering projects without the need for secondary certification conversion.

Diverse Materials, Strong Adaptability

Offers carbon steel, stainless steel, alloy steel and other materials to adapt to different media and environments.

Flexible Surface Treatment

Provides 5 surface treatment options: bare surface, paint, rust preventive oil, anti-erosion paint, and hot-dip galvanizing. Hot-dip galvanizing treatment significantly enhances erosion resistance in outdoor and humid environments, extending service life by over 50%.

Main Applications

Semiconductor and Electronics Manufacturing

Used to transport high-purity electronic-grade chemicals, specialty gases, or ultra-pure water.

Power Engineering

Steel concentric reducer suitable for piping systems in boilers, turbines, heat exchangers, etc.

Shipbuilding and Marine Engineering

316L stainless steel material resists chloride ion erosion, suitable for marine environments. Used in ship ballast water and fuel oil pipeline systems.

FAQ

Q1: Are your products suitable for high-temperature, high-pressure or corrosive media environments?

A1: Yes. We offer multiple material options to meet different operating requirements: Carbon steel materials are suitable for general industrial pipelines. Stainless steel materials offer excellent erosion resistance, making them ideal for chemical and marine engineering environments. Alloy steel materials are specifically designed for high-temperature and high-pressure conditions, suitable for applications such as boilers, steam turbines, and heat exchangers. Wall thickness classes accommodates various pressure requirements. Surface treatments including anti-erosion coatings and hot-dip galvanizing are available to further extend product service life.

Q2: Do you have quality assurance for your steel concentric reducer?

A2: Our concentric reducers are manufactured in strict accordance with multiple international criterions. We have a complete quality control system from raw material procurement to final inspection. Each product is individually inspected to ensure a smooth surface free from oxidation, burrs, cracks, or obvious mechanical scratches. Dimensional, wall thickness, and hardness tests all comply with relevant criterions. Upon request, we can provide inspection reports such as magnetic particle examination and ultrasonic examination.

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