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Our Product

Flanges, Pipe Fittings, Valves

Product Application

Petroleum, water treatment, chemical industry, ship and ocean engineering, nuclear power, papermarking.

Production Equipment

120+ CNC Equipments

Production Market

Southeast Asia, Middle East, Europe, Africa, Australia etc.

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About us
12Years ofExperience

ZheJiang Chengjiu Pipeline Co., Ltd.

We specialize in the design, development, manufacturing, testing, and sales of industrial flanges, pipe fittings, and stainless steel valves.
With a registered capital of $66.88 million USD, Cheng-jiu delivers high-performance flanges in sizes ranging from DN10–5000 (½" to 80"), pressure ratings from 0.25–42.0 MPa (150 lb to 2500 lb), and temperature resistance from -196°C to 1350°C.
Our products are widely used in power stations, nuclear power, petroleum, chemical processing, natural gas, military, municipal infrastructure, metallurgy, construction, pharmaceuticals, paper manufacturing, coal mining, cement production, pollution control, environmental protection, and energy-saving applications.
Renowned for superior quality, reliability, and performance, our solutions earn consistent acclaim from customers worldwide.

  • 15,000 Square Meters Of Factory Area
  • 120+ Equipments
  • 20+ Certification Systems
  • 10,000 tons Annual Production Value
  • 4,000+ Business Partners
  • 1,000 tons in Stocks
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hot sell
Hot Products
Ansi Slip On Flange
Ansi Slip On Flange

Characteristics of ansi slip on flange:
1 Easy Installation: Ansi Slip On Flange are designed to slide over...

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Weld Neck Flange Asme B16 5
Weld Neck Flange Asme B16 5

Characteristics of Weld Neck Flange Asme B16 5:
1.Strong Connection: Weld Neck Flange Asme B16 5 provide...

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relation

12Years

Factory Experience

120+

Production Equipments

10,000

Annual Production Value

+8613750902353

With 12 years of expertise in manufacturing flanges and pipe fittings, we deliver unmatched professionalism. Our robust quality control, high production capacity, and competitive pricing provide you with a distinct advantage in the industry. Choosing us is the smart choice for reliability and value.

Contact us

Visting our company online?

We have factory vr display, you can contact our staff to learn more about our production qualification and equipment conditions

PROCESS

Our Working Process

  • 1
    product-200-200
    Select a project

    FORGING

    Flange forging is a hot-forming process that compresses heated metal into high-strength, leak-proof components with superior fatigue resistance for demanding pipeline applications.

  • 2
    product-200-200
    Project Analysis

    HEAT TREATING

    Flange heat treatment involves controlled heating/cooling to enhance mechanical properties, ensuring optimal hardness, strength and stress relief for demanding industrial applications.

  • 3
    product-200-200
    Deliver Sample

    MACHINING

    Flange machining precisely shapes metal through turning, drilling, and milling to achieve tight tolerances and smooth sealing surfaces for secure pipe connections.

  • 4
    product-200-200
    Order comform

    TESTING

    Flange inspection involves dimensional checks, material testing, and pressure validation to ensure leak-proof integrity and compliance with international standards like ASME/ANSI.

APPLICATION

Latest Case

case 01

PETROLEUM

Over the years, we have actively explored and continuously made progress,fully utilizing modern technology and information networks to timely grasp market information, and have never stopped moving forward. Having gone through many trials and tribulations, CNCJ has come a long way through persistence and innovation, and has achieved many brillant achievements in related fields such as papermaking shipbuilding, petroleum, chemical, power, natural gas, water treatment, nuclear energy, and construction.

case 02

CHEMICAL INDUSTRY

Over the years, we have actively explored and continuously made progress,fully utilizing modern technology and information networks to timely grasp market information, and have never stopped moving forward. Having gone through many trials and tribulations, CNCJ has come a long way through persistence and innovation, and has achieved many brillant achievements in related fields such as papermaking shipbuilding, petroleum, chemical, power, natural gas, water treatment, nuclear energy, and construction./p>

case 03

NUCLEAR POWER

Over the years, we have actively explored and continuously made progress,fully utilizing modern technology and information networks to timely grasp market information, and have never stopped moving forward. Having gone through many trials and tribulations, CNCJ has come a long way through persistence and innovation, and has achieved many brillant achievements in related fields such as papermaking shipbuilding, petroleum, chemical, power, natural gas, water treatment, nuclear energy, and construction.

Latest News
CNCJ: Your Trusted Partner In Stainless Steel Flanges & Pipe Fittings Solutions

May 28, 2025

CNCJ: Your Trusted Partner In Stainless Steel Flanges & Pipe Fittings Solutions

For over 12 years, CNCJ has stood at the forefront of stainless steel flange ma...

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What Are Pipe Flanges

May 21, 2025

What Are Pipe Flanges

Flanges are critical components in industrial piping systems, serving as the co...

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Key Considerations For Flange Valve Material Selection

Apr 17, 2025

Key Considerations For Flange Valve Material Selection

Flange valves play a vital role in various industrial pipeline systems. The cho...

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Technical Features Of Flange Valves: Excellent Performance Guarantees Fluid C...

Apr 16, 2025

Technical Features Of Flange Valves: Excellent Performance Guarantees Fluid C...

In the field of fluid control, flange valves have become an indispensable and i...

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Precautions For The Use Of Flange Valves

Apr 15, 2025

Precautions For The Use Of Flange Valves

In various pipeline systems, flange valves play a vital role. In order to ensur...

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