Xinyue Steel is a premier international supplier specializing in large diameter flanges and pipe fittings for critical industrial and energy applications worldwide. Our proven capability to manufacture and deliver heavy-duty, specification-compliant components is demonstrated by our recent major project in Nigeria.
Project Case: Gas Transport System, Nigeria
Products Supplied: Large Diameter Weld Neck Flanges, Eccentric Reducer, Gaskets
Key Specifications:
28″ & 20″ RF WN Flanges
30″ x 28″ Eccentric Reducer
28″ & 20″ Gaskets
Standards & Materials: ASME B16.47 Series A, A350-LF2 CL.1 (LTCS), A320-L7 / A194-GR7 Bolting

This project highlights our expertise in producing and supplying large-scale, engineered components for high-pressure gas transport, meeting stringent ASME standards for material and dimensional integrity.
Our Expertise in Large Diameter Components
Xinyue Steel is equipped to handle the complex demands of manufacturing and supplying large diameter piping components for sectors including oil & gas, petrochemical, power generation, and water infrastructure.
Product Range & Capabilities:
Large Diameter Flanges (12″ and above):
Types: Weld Neck (WN), Slip-On (SO), Blind (BL), Lap Joint, Orifice, Anchor, and Expander Flanges.
Standards: ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, DIN, JIS, GOST.
Pressure Ratings: Class 150 to Class 2500, PN6 to PN100.
Materials: Carbon Steel (A105, A350 LF2), Stainless Steel (A182 F304/316), Alloy Steel, Duplex/Super Duplex.
Large Diameter Pipe Fittings:
Types: Elbows (90°/45° Long & Short Radius), Tees (Equal & Reducing), Reducers (Concentric & Eccentric), Caps, Crosses, Stub Ends.
Sizes: Up to 120″ (3000mm) and custom sizes.
Manufacturing: Seamless, welded, fabricated, and forged options.
Why Choose Xinyue Steel for Your Large Diameter Needs?
Specialized Manufacturing: Dedicated production lines and heavy machining capabilities for large components.
Full Material Traceability: Comprehensive Mill Test Certificates (MTC) and material certifications for all products.
Technical Support: Engineering support for specification review, material selection, and non-standard design.
Global Supply Chain: Proven logistics expertise for transporting oversized and heavy components worldwide.
Competitive Lead Times: Efficient project management for both standard and custom large-diameter orders.
Quality Assurance & Testing
We implement rigorous quality control measures, including dimensional verification, material testing (chemical & mechanical), Non-Destructive Testing (NDT) like UT, RT, and PMI, ensuring every component meets the highest industry standards.
Request a Quote for Your Project
For your requirements concerning large diameter flanges, fittings, or complete piping packages, Xinyue Steel offers competitive pricing and reliable delivery. Submit your specifications for a prompt quotation.
Contact Us for Your Large Diameter Piping Needs:
Website: https://www.xysteelpipe.com
Email: sales@xysteelpipe.com
WhatsApp: +0086 189 7484 9825
Xinyue Steel – Delivering Large-Scale Solutions for Global Infrastructure.