SS201 SS303 SS304 SS316 Q235 CNC Machining Flanges - Welding Neck, Blind, Slip-On & Thread Types for 0.25-42.0Mpa Systems
Professional CNC machining services for high-precision welding neck, blind, slip-on, and threaded flanges manufactured from premium materials including SS201, SS303, SS304, SS316 stainless steel and Q235 carbon steel.
- SS201: Cost-effective chromium-nickel-manganese alloy
- SS303: Free-machining grade with excellent machinability
- SS304: General purpose austenitic stainless steel
- SS316: Superior corrosion resistance with molybdenum content
- Q235: Chinese standard structural carbon steel
- Carbon Steel
- Cast Steel
- Alloy Steel
- Stainless Steel
- Copper
- Aluminum Alloy
- Forged Flanges
- Cast Flanges
- Welded Flanges
| Standard | Designation |
|---|---|
| Chinese National Standard | GB (Ministry of Chemical Industry, Petroleum, Power Standards) |
| American Standard | ASTM |
| German Standard | DIN |
| Japanese Standard | JB |
Nominal pressure range: 0.25Mpa to 42.0Mpa
- Series 1: PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42
- Series 2: PN0.25, PN0.6, PN2.5, PN4.0
| Type | Code | Description |
|---|---|---|
| Flat Welding Flange | PL | Basic welding flange for general applications |
| Flat Welding Neck | SO | Welding neck flange with flat face |
| Butt Welding Flange | WN | High-strength connection for critical applications |
| Socket Welding Flange | SW | For small diameter pipes (PN≤10.0Mpa, DN≤40) |
| Threaded Flange | Th | Screw-on installation without welding |
| Loose Flange | PJ/SE | For corrosive environments with replaceable inserts |
| Blind Flange | BL | Pipe end closure for system isolation |
| Integral Flange | IF | Integrated with equipment or valves |
- Flat Face (FF)
- Raised Face (RF)
- Concave Surface (FM)
- Convex Surface (MF)
- Tongue and Groove (TG)
- Ring Joint (RJ)
Ideal for high-pressure systems requiring superior structural integrity. Features include robust construction, high temperature and pressure tolerance, reliable sealing performance, and resistance to thermal cycling. Recommended for nominal pressures 0.25-2.5Mpa with concave-convex sealing surfaces.
Cost-effective solution for mild service conditions including low-pressure compressed air and circulating water systems. Available in smooth, concave-convex, and tongue-groove sealing configurations.
Perfect for corrosive environments where contact surfaces require premium materials while maintaining cost efficiency. Utilizes corrosion-resistant inserts with carbon steel backing rings.
- Strict compliance with international production standards
- Competitive pricing with real-time market adjustments
- Secure transaction processing and financial protection
- Comprehensive after-sales support and technical assistance
- Long-term partnership focus with consistent quality delivery
Shandong Zhengde Metal Manufacturing Co., Ltd. operates multiple production facilities with over 100 production lines, 4 certified laboratories, and extensive export experience to 50+ countries worldwide.
ISO 9001 certified with available third-party inspections including SGS and BV. All products undergo rigorous quality testing before shipment.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.