Haihao Group Delivers Large-Diameter ASTM A403 WP316/316L Welded Pipe Fittings to Singapore
Haihao Group has successfully completed the production and shipment of a batch of ASTM A403 WP316L welded fittings for a Singapore customer serving the petrochemical and process industries. The order includes 38-inch long radius elbows, equal tees, and reducing tees, all manufactured in accordance with ASME B16.9 from A/SA 403 Grade WP316/316L Class WX welded stainless steel.
Designed for demanding process piping systems, these large-diameter fittings underwent strict material verification, solution heat treatment, corrosion testing, and PMI inspection to ensure full compliance with the customer’s technical specifications.
Shipment Details
| Product | Size (OD × WT) | Standard | Material |
| 90° Long Radius Elbow (Back Weld Reinforced) | 38″ × 0.375″ | ASME B16.9 | A/SA 403 Gr. WP316/316L Class WX Welded |
| Equal Tee (Butt Weld) | 38″ × 0.375″ | ASME B16.9 | A/SA 403 Gr. WP316/316L BW Welded |
| Reducing Tee (Butt Weld) | 38″ × 24″ × 0.375″ × SCH40S | ASME B16.9 | A/SA 403 Gr. WP316/316L BW Welded |
Large-Diameter Stainless Steel Fittings for Critical Process Systems
This shipment demonstrates Haihao Group’s capability to manufacture ASTM A403 WP316L welded fittings for large-diameter industrial piping systems. Components with a 38-inch outside diameter require precise forming, controlled welding procedures, accurate bevel machining, and rigorous dimensional inspection to ensure smooth field installation.
The supplied fittings feature:
- ASME B16.9 dimensional compliance
- Factory-prepared welding bevels
- Large-diameter welded construction
- Excellent corrosion resistance of 316/316L stainless steel
- Reliable performance in petrochemical, offshore, LNG, and chemical processing applications
Each ASTM A403 WP316L welded fittings order is produced under a comprehensive quality management system to ensure consistency throughout manufacturing.
ASME B16.9 ASTM A403 WP316L welded stainless steel pipe fittings ready for shipment
Comprehensive Material Verification and Testing
To satisfy the customer’s project specifications, Haihao Group provided complete traceability and inspection documentation with every fitting.
The supplied documentation includes:
- Original Mill Test Certificate (MTC)
- Chemical composition analysis
- Mechanical property report
- Positive Material Identification (PMI) report with on-site PMI photographs
- Heat treatment records
- Intergranular corrosion test report
The MTC also specifies:
- Tensile specimen orientation
- Gauge length width
- Test specimen direction
This detailed information allows project engineers and inspection authorities to verify full compliance with procurement specifications.
Solution Heat Treatment for Superior Corrosion Resistance
All fittings received solution annealing in accordance with the customer’s requirements.
The heat treatment process included:
- Solution Annealing (Minimum 1040°C)
- Water Quenching
This process restores the corrosion resistance of stainless steel after welding while maintaining the mechanical properties required for demanding service environments.
In addition, every ASTM A403 WP316L welded fittings component successfully met the ASTM A262 Practice E Intergranular Corrosion Test, demonstrating resistance to sensitization and intergranular attack after fabrication.
Reliable Manufacturing for International Pipeline Projects
Haihao Group regularly manufactures large stainless steel pipe fittings for customers worldwide, including:
- Long radius elbows
- Equal tees
- Reducing tees
- Reducers
- Pipe bends
- Custom fabricated fittings
Our products are supplied in carbon steel, stainless steel, duplex stainless steel, super duplex stainless steel, nickel alloys, and alloy steel according to international standards including ASME, ASTM, EN, DIN, JIS, API, and GOST.
For projects requiring ASTM A403 WP316L welded fittings with complete inspection documentation, Haihao Group provides dependable manufacturing, professional technical support, and worldwide delivery.
Whether your project requires standard fittings or customized large-diameter components, our engineering and production teams can deliver products that meet stringent international specifications while ensuring on-time shipment.
Why Choose Haihao Group?
- Over 40 years of pipeline manufacturing experience
- Large-diameter pipe fitting production capability
- Strict quality control throughout manufacturing
- Complete inspection reports and original MTCs
- International export experience serving more than 100 countries
- Customized production according to project specifications
- Professional packaging and global logistics support
If you are looking for a reliable supplier of stainless steel pipe fittings for refinery, LNG, offshore, or petrochemical projects, Haihao Group is ready to support your requirements.