Stainless Steel Pipe Fittings

Stainless steel fittings are a type of pipe fittings. They are made of stainless steel, so they are called stainless steel pipe fittings. They include: stainless steel elbows, stainless steel tees, stainless steel crosses, stainless steel reducers, stainless steel pipe caps, etc. According to the connection method, they can be divided into four categories: socket-type stainless steel pipe fittings, threaded stainless steel pipe fittings, flanged stainless steel pipe fittings and welded stainless steel pipe fittings. Stainless steel elbows are used for the turning points of pipe fittings; flanges are used to connect pipes to each other and are connected to the ends of pipes. Stainless steel tees are used for the places where three pipes converge; stainless steel crosses are used for the places where four pipes converge; stainless steel reducers are used for the places where two pipes of different diameters are connected. Main stainless steel materials: 304, 304L, 316|, 316L

Welding

Stainless steel fittings are pipe fittings that insert stainless steel pipes into the socket part of the pipe fittings and then perform argon arc welding along the edge of the pipe fittings. They are the most reliable connection method among all connection methods. The inner diameter of the pipe fitting socket = the outer diameter of the pipe. According to the edge welding part of the pipe fitting, it can be further divided into three types of pipe fittings: slope edge extension, step edge extension and no extension. The socket welding specifications are generally DN15-DN100.

Butt welding type

Butt welding stainless steel fittings are pipe fittings that perform argon arc welding along the butt seam of the stainless steel pipe and the pipe fittings. Generally, welding welding is required.

The outer diameter of the pipe fitting socket = the outer diameter of the pipe.

Butt welding is generally used for welding of stainless steel pipeline systems with larger specifications.

Compression type pipe fittings

It has the characteristics of reliable and safe connection, convenient and fast construction, suitable for embedded installation, maintenance-free update, and relatively superior economy.

The working principle of the compression fittings is to insert the thin-walled stainless steel pipe into the socket of the compression fittings, and use a special compression tool to clamp the stainless steel pipe in the fittings. The cross-section of the compression part is hexagonal, and there is an O-ring seal between the stainless steel pipe and the fittings, which makes it have the characteristics of anti-leakage, anti-pulling, anti-vibration and high-pressure resistance. Therefore, it is a more advanced connector in direct drinking water systems, tap water systems, heating systems, steam systems, industrial oil pipe systems and industrial gas pipe systems. It is suitable for water, oil, gas and other pipeline connections. Manufacturing standard: GB/T 19228.1 2003

Nominal pressure: ≤1.6MPa

Applicable temperature: -20℃ ~110℃

Applicable media: non-corrosive or corrosive media such as oil, water, and gas

Making materials: stainless steel 304 316L

Pipe: Φ15.88～Φ108 stainless steel welded steel pipe

Quick-fitting fittings

Plug-in self-locking spring-clip fittings

The quick flash connection method is a "plug-in self-locking spring-clip connection" technology. As long as the pipe is inserted into the quick-fitting fitting, the quick flash installation effect can be achieved. When disassembling, just use the matching lightweight special tool to clamp the quick-fitting fitting and apply force to pull out and remove the pipe.

Quick flash fittings are not only more convenient and quick to install and disassemble, but also have excellent properties such as reusable, leak-proof, shockproof, and buffering cold shrinkage and hot expansion. It is a new exploration and breakthrough in pipeline connection methods. It has been widely used and verified in water supply systems at home and abroad, and the pipe fittings are designated pipes by the Water Supplies Department in Hong Kong.

Through the special high-temperature resistant rubber ring, the pipe fittings have also begun to be gradually applied and recognized in the water supply and drainage pipes of solar water heaters, making installation and use more convenient. I believe that in the future, there will be more new innovations and breakthroughs in pipeline connection technology, and it will continue to develop in the direction of convenience, speed, and humanization, and there will be more products for human enjoyment.

Specifications

Specifications Ф3.0mm～450.0mm, stainless steel thin tubes, square tubes, thick-walled tubes, seamless tubes, seamed tubes, industrial tubes, liquid delivery tubes, with bright and matte surfaces, which can be customized according to customer requirements. Material: SUS310S, SUS316, 316L, 304, 304L, 321, 303, 303CU, 301, 202, 201, etc.

Classification of stainless steel fittings

I. Classification by connection method

1. Threaded pipe fittings

Fittings connected by threads are suitable for medium and low pressure pipeline systems and are easy to install and disassemble.

Common types: threaded elbows, threaded tees, threaded joints, etc.

Application scenarios: household water supply, industrial pipelines.

2. Welded pipe fittings

Connected by welding, with good sealing, suitable for high pressure and high temperature environments.

Common types: welded elbows, welded tees, welded reducers.

Application scenarios: petrochemical industry, natural gas transportation.

3. Compression fittings

Connected by special compression tools, fast and firm installation, mainly used for water supply and gas pipeline systems.

Common types: compression elbows, compression tees, compression joints.

Application scenarios: building water supply and drainage systems, heating systems.

4. Flange pipe fittings

Connected by flanges, used for large pipelines or systems that need to be frequently disassembled.

Common types: flange elbows, flange tees, flange joints.

Application scenarios: industrial pipeline systems, large transmission pipelines.

5. Socket-and-spigot pipe fittings

One end is a socket and the other end is a spigot. They are connected by plugging and are suitable for systems with lower pressure.

Common types: socket elbows, socket tees, and socket reducers.

Ⅱ. Classification by use

1. Water supply pipe fittings

Suitable for domestic water transportation, requiring excellent hygienic performance.

2. Drainage pipe fittings

Suitable for sewage and rainwater drainage systems, with corrosion resistance.

3. High-pressure pipe fittings

Used to transport high-pressure fluids or gases, such as the oil and gas industry.

4. Decorative pipe fittings

Used for architectural decoration, such as railings, handrails, etc.

Ⅲ. Classification by shape

1. Elbow

Pipe fittings that change the direction of the pipeline, common angles are 45°, 90°, and 180°.

2. Tee

Used for branch pipeline connection, there are straight tees and reducing tees.

3. Cross

Used for the intersection and connection of multiple pipes, mainly used in complex pipe systems.

4. Reducer

Connects pipes of different diameters, divided into concentric reducers and eccentric reducers.

5. Cap

Fittings that close the end of the pipe, used at the end of the pipe system.

6. Coupling

Used to connect two sections of pipes, divided into straight-through connectors and reducers.

7. Flange

Used for connection between pipes and equipment, pipes and pipes, easy to disassemble and repair.

8. Olet

Open a hole on the main pipe to connect the branch pipe, commonly used in high-pressure pipe systems.

IV. Classification by material

1. 304 stainless steel

Economic stainless steel material, suitable for general corrosion-resistant environment.

2. 316 stainless steel

Contains molybdenum, has stronger corrosion resistance, suitable for chemical and marine environments.

3. Duplex stainless steel

High strength, excellent corrosion resistance, suitable for high-strength demand scenarios.

4. 310S stainless steel

Excellent high temperature resistance, suitable for high temperature environment.

V. Classification by production process

1. Cast pipe fittings

Made by casting process, suitable for large or complex shape pipe fittings.

2. Forged pipe fittings

Made by forging process, with high strength and high pressure resistance.

3. Cold drawn pipe fittings

Made by cold working process, with smooth surface and high precision.

VI. Classification by standard

1. National standard pipe fittings (GB)

Pipe fittings that meet Chinese national standards.

2. American standard pipe fittings (ASME/ANSI)

Meet American standards and are often used for export or international projects.

3. European standard pipe fittings (EN/DIN)

Meet European standards and are suitable for European projects.

Stainless steel pipe fittings are favored for their superior performance and wide application. Their characteristics are mainly reflected in the following aspects:

Features of stainless steel pipe fittings

I. Strong corrosion resistance

1. Anti-oxidation

Stainless steel contains chromium, which can form a dense passivation film on the surface, effectively resisting the erosion of substances such as air, water, acid, alkali and salt.

2. Adapt to harsh environment

High-grade materials such as 316 stainless steel perform well in strong acid, strong alkali and marine environments.

II. Superior mechanical properties

1. High strength and hardness

Stainless steel fittings have good strength and pressure resistance and can withstand high-pressure fluid transportation.

2. Good impact resistance

Can resist external impact and vibration, suitable for industrial environments.

III. High and low temperature resistance

1. High temperature resistance

Stainless steel pipe fittings will not deform or degrade in high temperature environment, and are suitable for boilers, high temperature pipelines and other fields.

2. Low temperature resistance

In extremely low temperature environments (such as freezing pipelines), stainless steel pipe fittings still have good toughness and reliability.

Ⅳ. Long life

1. Not easy to age

Compared with ordinary metal materials, stainless steel pipe fittings are not prone to rust, wear and other problems in long-term use, and the service life can reach decades.

2. Low maintenance cost

Because of its superior corrosion resistance and mechanical properties, it requires less daily maintenance.

Ⅴ. Diverse connection methods

1. Adapt to different needs

Supports a variety of connection methods such as threading, welding, flanges, and compression, which can be flexibly selected according to specific scenarios.

2. Easy installation

Some connection methods (such as compression connection) are quick and easy to install, reducing construction time and cost.

Ⅵ. Good hygienic performance

1. Non-toxic and harmless

Stainless steel meets food grade requirements and will not pollute water quality and media. It is widely used in drinking water and food processing pipelines.

2. Smooth surface

The inner wall is smooth and not easy to breed bacteria and dirt, meeting high hygiene standards.

Ⅶ. Aesthetics

1. Bright appearance

After polishing, the stainless steel surface has high gloss and aesthetics, which is suitable for decorative scenes.

2. Anti-scratch

The surface is hard and wear-resistant, and it remains bright and new after long-term use.

VIII. Good environmental performance

1. Recyclable

Stainless steel materials have a high recycling value, can be reused, and meet environmental protection requirements.

2. Save resources

Long life, low maintenance cost, and reduce resource waste.

IX. Wide range of applications

1. Applicable to a variety of media

Can transport water, oil, gas, acid and alkali and other media.

2. Wide range of applications

Involving chemical, construction, pharmaceutical, food processing, water treatment, shipbuilding and other industries.

X. Strong wear resistance and fatigue resistance

1. High wear resistance

Suitable for long-term transportation of fluids containing solid particles, such as slurry pipelines.

2. Good fatigue resistance

Long-term use under complex working conditions is not easy to crack or damage.

Application fields of stainless steel pipe fittings

I. Construction and municipal engineering

1. Water supply system

Due to its hygienic properties and corrosion resistance, stainless steel fittings are widely used in urban water supply networks, household water supply systems and drinking water delivery systems.

Features: corrosion-resistant, non-toxic and harmless, no effect on water quality.

2. Drainage and sewage treatment

Connectors used in drainage networks and sewage treatment equipment can resist the erosion of corrosive sewage for a long time.

Features: acid and alkali resistance, long life.

3. Building decoration

Used for decorative guardrails, railings, etc., with a bright appearance and increased architectural beauty.

Features: beautiful and durable.

II. Industrial field

1. Chemical and petroleum industry

Stainless steel pipe fittings are used in pipeline systems for conveying corrosive liquids, gases or high-temperature and high-pressure fluids, such as chemical plants and oil refineries.

Features: high temperature resistance, corrosion resistance, and strong pressure bearing capacity.

2. Food and Beverage Industry

Widely used in food processing, dairy production, beer and beverage pipelines to ensure hygiene standards and the purity of the medium.

Features: hygienic and safe, not easy to breed bacteria.

3. Pharmaceutical Industry

Used to transport pure water, liquid medicine, etc., with high requirements for material hygiene and surface finish.

Features: Meets GMP standards and excellent hygienic performance.

4. Energy Industry

Applied to high-pressure pipeline connections in nuclear power plants, thermal power plants and oil and gas production.

Features: resistant to high temperature and high pressure, strong fatigue resistance.

5. Shipbuilding and Marine Engineering

Used in ship transportation pipelines and offshore drilling platforms to resist salt spray corrosion and harsh environments.

Features: resistant to salt spray and strong corrosion resistance.

III. Household and Civil Fields

1. Household Pipeline System

Widely used in household drinking water pipelines, hot water pipelines and gas pipelines to ensure water and gas safety.

Features: hygienic and non-toxic, long service life.

2. Heating and air conditioning system

Used in the circulation pipelines of heating, cooling and central air conditioning to ensure long-term stable operation of the system.

Features: high and low temperature resistance, good sealing performance.

3. Solar energy and water heater matching

Applied to solar water heater pipeline connection and other related equipment.

Features: corrosion resistance and strong pressure bearing capacity.

IV. Special application fields

1. Aerospace field

Stainless steel pipe fittings are used in aerospace fuel pipelines and high-temperature and high-pressure liquid delivery systems.

Features: light weight and high temperature resistance.

2. Medical equipment

Used in infusion pipelines and medical gas delivery pipelines in medical equipment.

Features: high surface finish, hygienic and non-toxic.

3. Military field

Applied to pipeline connections in military equipment, such as submarines, warships, missile launchers, etc.

Features: high strength and corrosion resistance.

V. Environmental protection field

1. Sewage treatment

Used in the delivery pipelines, pump station connection pipes and treatment equipment of sewage treatment plants, it can resist the erosion of acidic and alkaline wastewater.

Features: strong corrosion resistance and low maintenance cost.

2. Waste gas treatment

Used for pipe connection in industrial waste gas purification equipment, suitable for high temperature acidic gas environment.

Features: corrosion resistance and high temperature resistance.

VI. Agriculture and irrigation

1. Farmland irrigation system

Used in large agricultural irrigation equipment and pipe network systems to transport water and fertilizer.

Features: wear resistance and not easy to clog.

2. Greenhouse system

Used in greenhouses for water supply and drainage systems to ensure efficient planting and water resource utilization.

Features: excellent anti-corrosion performance.

VII. Other applications

1. Firefighting system

Used for firefighting pipes in high-rise buildings, warehouses and industrial plants, capable of withstanding high-pressure water flow.

Features: high pressure resistance and corrosion resistance.

2. Automobile manufacturing

Used in automobile engine exhaust pipes, fuel pipes and other systems to meet the requirements of high temperature and high pressure working conditions.

Features: high temperature resistance and fatigue resistance.

3. Electronics industry

Used in pure water delivery pipelines or corrosive gas exhaust pipelines in semiconductor production.

Features: high surface cleanliness and corrosion resistance.