Refinery and chemical plant piping systems don't tolerate weak links. A single flange failure under high pressure, thermal cycling, or H₂S exposure can mean unplanned shutdowns, safety incidents, or costly rework during hydrotesting. At Zhangjiagang Xinjie Forging, we produce heavy-duty forged flanges specifically for petrochemical applications. Our shop floor handles everything from standard ASME B16.5 weld neck flanges to large-bore, NACE-compliant blind and slip-on types. We've supplied flanges for hydrocracker units, ethylene plants, and offshore gas platforms, and we design our process around what actually matters on site: consistent grain structure, accurate welding bevels, reliable NDT results, and full material traceability.
Specifications & Manufacturing Range
|
Parameter |
Details |
|
Flange Types |
Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice |
|
Size Range |
DN15 – DN1500 (½" – 60") |
|
Pressure Classes |
150 – 2500 (PN6 – PN420) |
|
Common Materials |
ASTM A105, A350 LF2/LF3, A182 F304/F316/F51/F53, F11/F22/F91, 42CrMo4 |
|
Facing Options |
RF, FF, RTJ, MFM, TG |
|
Special Service |
NACE MR0175/ISO 15156 sour service, high-temp, cryogenic |
|
Inspection |
100% UT, MT/PT, PMI, Charpy impact, hardness mapping |
Note: All dimensions, materials, and testing levels can be matched to ASME, EN, API, or your proprietary procurement spec.
Standards We Work With Daily
- ASME/ANSI: B16.5, B16.47 Series A & B, B16.25
- European: EN 1092-1, EN 10222-2/3/4, PED 2014/68/EU
- Industry-Specific: API 6A / API 605, NACE MR0175 / ISO 15156
- Quality Systems: ISO 9001:2015, ISO 14001:2015 certified facility
We're accustomed to third-party audits (SGS, TÜV, BV, DNV) and can supply CE marking, CRN documentation, or customer-specific test packages upon request.
Why Refinery Procurement Teams Work With Us
Direct Factory Control – No trading middlemen. Forging, heat treatment, machining, and testing all happen under one roof in Zhangjiagang.
Predictable Lead Times – We plan production around confirmed orders, not speculation. Standard orders ship in 4–6 weeks. Large or exotic material orders: 7–9 weeks.
Low NDT Rejection Rate – Our rough-forging UT screening keeps final rejection below 0.8%. You get parts that pass hydrotest the first time.
Clear Communication – You'll work with an engineer who understands ASME piping specs, not a sales rep reading from a brochure. Weekly photo updates, test reports, and shipping schedules are standard.
Common Questions from Procurement & Engineering Teams
Q: Do you guarantee NACE MR0175 compliance for sour service flanges?
A: Yes. We control sulfur content in raw material selection, limit hardness to ≤22 HRC, and provide hardness mapping reports. HIC/SSC testing can be arranged through accredited labs if your spec requires it.
Q: Can I get EN 10204 3.2 certificates with third-party witness?
A: Absolutely. We routinely coordinate with SGS, TÜV, or your nominated inspector for material verification, NDT witness, and dimensional checks before shipment.
Q: What happens if a flange fails UT during incoming inspection?
A: We replace it immediately at our cost. Our internal UT screening catches defects early, but if something slips through, we cover return shipping and expedite a replacement. We'd rather lose a part than your project timeline.
Q: Do you machine welding bevels to match our WPS?
A: Yes. We cut bevels per your drawing or ASME B16.25. Root face, land, and angle are verified with CMM and reported before packing.
Q: How do I request a quote?
A: Send your drawing, material grade, quantity, and required standards. If you're unsure about facing type or pressure class, just tell us the operating pressure, temperature, and medium. We'll reply with a technical quote, lead time, and material alternatives within 24–48 hours.
Need a flange that passes inspection the first time?
Send your specs to our email or use the inquiry form below. We'll review it with our forging & machining team and get back to you within 1 business day.
