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Slip-on flange
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We have obtained TÜV product certification and ISO 9001 quality management system certification, and has invested in state-of-the-art instrumentation and equipment specific to the industry, ensuring more scientific, standardized, and modern manufacturing processes.
Product Details
Slip-on Flanges – Dedicated to Cost-Effective Pipeline Connection Solutions for 28 Years
Among the diverse customer base served by Zhongli Flange, approximately 40% of piping projects—where low-pressure, ambient-temperature conditions involve the conveyance of water, steam, air, and non-corrosive media—preferentially specify loose-type flanges. Compared with butt-welded flanges, loose-type flanges eliminate the need for costly high-neck designs, thereby reducing project procurement costs while still delivering reliable sealing performance. Over the past 28 years, we have continuously refined the forging and machining processes for loose-type flanges, striving to provide customers with on-demand, stable, reliable, and cost-effective solutions.
Four Key Value Propositions of Zhongli’s Manufacture of Loose-Fitting Flanges
Our understanding of “economy” has never come at the expense of quality. Through bulk procurement, process optimization, and stringent quality control, Zhongfa Lifen creates value for you across four dimensions:
Precise cost control, transparent value
Material Optimization: We have established direct supply partnerships with major domestic steel mills and centrally procure commonly used billets such as A105 and 304. This not only ensures consistent product quality at the source but also effectively reduces costs.
Process Efficiency: By employing multi-station CNC machining centers, we have reduced the overall machining time per flange by approximately 10% compared with conventional processes. These efficiency gains directly benefit our customers.
Precision and Consistency Beyond the Standard
Each batch of flanges you receive exhibits outstanding dimensional interchangeability. Our CNC drilling machines ensure that the bolt-hole pitch-circle diameter (PCD) tolerance is maintained within ±0.3 mm, while the surface roughness of the sealing faces (RF/MFM) consistently meets Ra ≤ 3.2 μm—effectively eliminating installation leaks caused by component tolerances.
Designed for easy installation
Although our slip-on flange design simplifies the installation process, our meticulous deburring and clear stamping markings (material and pressure rating) further reduce on-site assembly time and minimize the risk of errors.
Global Market Certification Support
Our flanges comply with Chinese national standards, and our production line and quality management system are ISO 9001:2015 certified. For the export market, we offer a wide range of standards, including GB (Chinese National Standard), HG (Chemical Industry Standard), ASME (American Society of Mechanical Engineers Standard), and API.
Technical Specifications
| Project | Typical range |
|
Nominal size |
DN15 – DN800 (1/2 inch – 32 inches) |
|
Pressure rating |
150–2,500 pounds (PN 6–PN 400) |
|
Sealing surface |
RF, MFM |
|
Materials |
A105, LF2, F304, F316L, F51 duplex stainless steel, and others. |
| Implementation Standards | National Standard (GB), Chemical Industry Standard (HG), American Standard (ASME) |
Why do customers choose Zhongli as their flange supplier?
Verifiable Quality Commitment: We operate a state-of-the-art testing laboratory equipped with ultrasonic flaw detectors, tensile testing machines, and other specialized equipment. We can perform comprehensive inspections on flanges in accordance with your technical specifications.
Seamless transition from drawings to finished products: Our technical team provides free drawing compliance reviews and optimization recommendations to prevent delivery delays caused by design-detail issues.
Transparent Production Progress Updates: Following contract execution, we will provide regular updates on the production status, including material cutting, forging, and machining.
Export-Grade Packaging and Logistics: We use export-grade wooden crates as our standard packaging to ensure that products arrive undamaged after long-distance ocean shipping, and we provide a complete set of customs documentation to support the process.
Next Step: Get Your Custom Quote
Please provide your technical specifications, purchase quantity, and target delivery date. Our sales engineer will contact you within 24 hours and offer you:
Detailed quotation specifications,
Estimated delivery time based on current production capacity.
Shanxi Chengyu Forging Co., Ltd.
Integrated forging manufacturer specializing in flanges and forgings across carbon steel, stainless steel, and alloy steel — serving the global petroleum, chemical, wind power, and marine industries.
Company Profile
A premier forging enterprise with integrated, end-to-end production capabilities — from raw material sawing through to finished product packaging and shipment.
Integrated Production
State-of-the-art instrumentation and equipment ensure scientific, standardized, and modern manufacturing processes across every stage.
Precision raw material cutting and blank preparation
Ring rolling, open-die and closed-die forging processes
Normalizing, quenching, tempering, and solution treatment
CNC turning, milling, and drilling to precise tolerances
Full physicochemical analysis and dimensional inspection
Export-grade packaging and logistics coordination
Product Portfolio
A comprehensive range of flanges and forgings manufactured to international standards, with particular expertise in necked slip-on and necked socket-weld flanges.
- Ring forgings
- Flanges (including necked slip-on and necked socket-weld types)
- Flange covers
- Shafts
- Tube sheets
Specialty focus: extensive manufacturing capabilities and proven experience in producing necked slip-on and necked socket-weld flanges — a key competitive differentiator.
Material Grades
Conforming Standards
Quality & Certifications
Internationally recognized certifications underpin every product we deliver, ensuring consistent quality and global market acceptance.
TÜV Product Certification
Independent third-party verification of product quality and conformity
ISO 9001 Quality Management
Systematic quality management across all production processes
| Item | Details |
|---|---|
| Enterprise Rating | AAA+ |
| Certifications | TÜV Product Certification, ISO 9001 |
| Annual Capacity | 8,000 metric tons |
| Annual Revenue | RMB 100 million |
| Personnel | 125 employees |
Served Industries
Our products are trusted across critical infrastructure and heavy industry sectors worldwide.
Petroleum
Chemical
Wind Power
Pressure Vessels
Shipbuilding
Machinery Mfg.
Keywords:
Chengyu
Forging
Online Quotation
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Jiulongwan Industrial Zone, Shacun Village, Dingxiang County, Xinzhou City, Shanxi Province
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