Industrial-grade austenitic stainless steel buttweld and forged fittings engineered for deepwater Gulf of Guinea platforms, midstream cryogenic LNG processing, and chemical refining complexes across Nigeria.
Alongside ASME B16.9 and ASTM A403 WP304L buttweld components, we manufacture and supply full-package fluid conveyance products built to withstand corrosive tropical soil and marine atmosphere environments.
ASTM A403 WP304L is an extra-low carbon variant (maximum 0.030% Carbon) of the standard austenitic 304 alloy. In demanding industrial facilities across Nigeria—from the Dangote Refinery Complex in Lekki Free Zone to offshore FPSOs moored in the Bonga and Egina fields—piping failure from intergranular corrosion poses immense operational and environmental safety hazards.
During circumferential buttwelding of high-pressure piping headers, thermal input between 450°C and 850°C causes chromium carbide precipitation at grain boundaries in higher carbon alloys. This leaves adjacent zones depleted of the chromium necessary to rebuild the protective passive oxide film (Cr2O3).
Our custom OEM WP304L buttweld elbows, equal tees, concentric reducers, and stub ends undergo full solution annealing at 1,040°C–1,150°C followed by rapid forced water quenching. This metallurgical treatment ensures complete homogenisation, absolute freedom from sensitisation, and impeccable durability in warm marine climates and sour condensate transfer systems.
| Grade Spec | Carbon (C max) | Chromium (Cr) | Nickel (Ni) | Tensile Strength (min) | Yield Strength (min) | Hardness (HBW max) |
|---|---|---|---|---|---|---|
| ASTM A403 WP304L (Seamless / W) | 0.030% | 18.0 – 20.0% | 8.0 – 12.0% | 70 ksi [485 MPa] | 25 ksi [170 MPa] | 183 HBW |
| ASTM A403 WP304 (Standard) | 0.080% | 18.0 – 20.0% | 8.0 – 11.0% | 75 ksi [515 MPa] | 30 ksi [205 MPa] | 183 HBW |
| ASTM A403 WP316L (Moly-alloyed) | 0.030% | 16.0 – 18.0% | 10.0 – 14.0% | 70 ksi [485 MPa] | 25 ksi [170 MPa] | 183 HBW |
From high-salinity coastal estuaries in the Niger Delta to critical midstream trunk lines, our custom OEM WP304L fittings meet strict technical requisites mandated by NNPC, international operators, and indigenous EPC contractors.
Moored in the Gulf of Guinea (Egina, Bonga, Usan), marine topside process skids require seawater injection lines, flare knock-out piping, and drainage circuits constructed from solution-annealed WP304L to stop micro-galvanic chloride pitting under severe maritime humidity.
Downstream infrastructure such as the Lekki and Port Harcourt refinery revamps integrate extensive buttweld piping for sulfuric acid treating units, sour water stripping, and hydrocarbon condensate stabilization, where intergranular carbide resistance is imperative.
Nigeria LNG Train 7 expansion on Bonny Island and the Ajaokuta-Kaduna-Kano (AKK) network depend on impact-tested, sub-zero ductile materials. ASTM A403 WP304L provides outstanding cryogenic toughness without fragile ductile-to-brittle transitions down to -196°C.
Nigeria's energy framework is undergoing rapid modernization driven by the Petroleum Industry Act (PIA) and the Decade of Gas initiative. To successfully bid on major capital engineering packages, international manufacturers and domestic contractors must satisfy three non-negotiable vectors:
Over three decades of manufacturing leadership, recognized by global oil corporations, approved by national boiler authorities, and certified by international quality agencies.
Operating under an ISO 9001 certified management system, our facilities hold formal accreditations from Engineers India Limited (EIL), Indian Boiler Regulations (IBR), and direct vendor supply qualifications on major ADNOC, Shell, and TotalEnergies project matrices.
Equipped with 11 specialized testing installations: Optical Emission Spectrometers (OES), Positive Material Identification (PMI), Universal Tensile Testers, Charpy V-Notch Impact Testers (-196°C), Hydrostatic testing loops, and ultrasonic thickness probes.
Every individual ASTM A403 WP304L fitting is die-stamped with its dedicated heat number, nominal pipe diameter, wall thickness schedule, pressure rating, and melt lineage, providing uninterrupted EN 10204 3.1 inspection documentation from ingot to final crate.
Clear, direct answers regarding customs protocols, marine packaging, NDT quality assurances, and port handling logistics for Nigerian procurement teams.
We work routinely with international verification agencies including Bureau Veritas, SGS, and Intertek to provide valid Product Certificates (PC) and SONCAP Certificates (SC). We coordinate directly with your authorized dealer bank in Lagos or Abuja to submit pro-forma documentation matching e-Form M declarations seamlessly.
Per ASME B16.9 and ASTM A403, WP304L-S fittings are formed directly from seamless cold-drawn tubes without longitudinal seam welds, preferred for Class 600+ pulsating or extreme cryogenic services. WP304L-W fittings are fabricated from welded pipe or plate; per code, weld seams undergo 100% radiographic examination (X-ray) before signoff.
Yes. Beyond standard stock schedules (SCH 10S to SCH XXS up to 24 inches), our facility designs and manufactures custom open-die forgings, eccentric conical reducers, high-yield branch outlets, and fabricated buttweld fittings up to 48 inches with custom weld-prep bevels matching non-standard pipe IDs.
All stainless steel fittings undergo ultrasonic degreasing, pickling, and chemical passivation according to ASTM A380 to passivate external surfaces. Fittings are individually end-capped with heavy-duty polyethylene protectors, heat-sealed in desiccated vapor-barrier plastic wraps, and packed in ISPM-15 heat-treated fumigated wooden seaworthy boxes.
Contact our dedicated OEM export department today. Our engineering staff provides line-by-line datasheet cross-referencing, project compliance audits, and competitive ex-mill or CIF Lagos/Port Harcourt quotations within 24 hours.
Contact Us