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Large-diameter 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
Large-diameter flanges—large bore, full rating, integral forging
When pipe sizes exceed the load capacity of the workbench, you need large-diameter flanges. These flanges are forged from solid billets, with grain flow and pressure ratings identical to those of smaller flanges—except that the bolt-hole circle diameter is specified in meters rather than millimeters. Whether they are referred to as large-bore flanges, A-series necked weld-end flanges, or B-series blind flanges, their function remains the same: to connect NPS 26 to 60 pipes without reducing the pressure rating.
Size concerns of buyers:
| Project | Typical range |
|
Nominal size |
NPS 26 – 60 (DN 650 – DN 24,000) |
|
Pressure rating |
75–1500 pounds (PN 6–PN 25 0) |
|
Series |
ASME B16.47 Series A and Series B, HG/T20623-2009 |
|
Sealing surface |
RF, FF, RTJ |
|
Materials |
A105, LF2, F304, F316L, F51 duplex stainless steel, and others. |
| Flange Type | WN, BL |
Why choose a large-diameter flange?
Integral forging—no transverse welds, ensuring a continuous load-bearing cross-section.
A/B Series Options—Heavy-Duty or Light-Duty Designs with a Consistent Bolt-Hole Layout
Lower overall cost—by employing near-net-shape forming, the allowances for the outer diameter and sealing surfaces are ≤3 mm, reducing machining volume by 18%–25% compared with conventional plate-welded blanks.
Long-term operational value—under the same pressure rating, forged components weigh 8% to 12% less than plate-welded blanks, thereby reducing the load on supports and foundations.
On-site Installation Advantages
Overall forging eliminates longitudinal welds, thereby eliminating the need for additional weld inspection during lifting operations and saving on-site nondestructive testing time.
A 2-mm machining allowance has been provided for the bolt holes, enabling direct trial assembly with the matching flange and thereby reducing the need for secondary machining.
Quotation Guide
1: Provide dimensions, thickness, material, quantity, and standards.
2: Specify the machining allowance
3: Overview of Technical Requirements
4: Quote provided within 48 hours
5: Custom manufacturing services are available based on drawings.
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
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Jiulongwan Industrial Zone, Shacun Village, Dingxiang County, Xinzhou City, Shanxi Province
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