Large-Diameter & Heavy-Wall Capability
Product formPipes
/ 01 — TECHNICAL OVERVIEW
Stainless Steel & High Nickel Alloy EFW Pipes
Manufacturer, Supplier & Exporter of large-diameter, heavy-wall EFW pipe for major process projects.
NESCO Pipe & Tubes supplies electric-fusion-welded (EFW) pipes for large-diameter, heavy-wall process piping where sizes and thicknesses exceed the practical range of standard welded or seamless pipe. EFW pipe is manufactured from tested plate, rolled into a cylindrical shell and joined along a longitudinal seam by an electric fusion welding process — typically single or double submerged-arc welding — qualified to the procedure required by the governing specification. Post-weld heat treatment, sizing and straightening follow, and the seam and pipe body are examined by radiography or ultrasonic testing, along with hydrostatic testing and dimensional checks, before dispatch.
Because EFW pipe is produced from individually rolled plate rather than coil, it supports diameters and wall thicknesses that seamless and standard welded processes cannot practically reach, making it a standard choice for large process headers, major pipelines, and heavy-wall pressure piping on refinery, petrochemical and power projects. The manufacturing route, weld procedure and inspection scope are project-specific and should be clearly agreed at enquiry stage, since EFW orders are generally made-to-order rather than ex-stock.
Industries specify EFW pipe from NESCO Pipe & Tubes when a project requires large-diameter or heavy-wall stainless or duplex pipe with a fully documented weld procedure, heat treatment record and inspection package. NESCO reviews each EFW enquiry against the plate specification, weld procedure, heat treatment requirement, NDT scope and delivery timeline, and coordinates third-party witnessing where the project calls for it — supporting project teams from enquiry through to delivery on demanding, large-scale piping packages.
How it is made
01
Plate is selected, tested and rolled to the required diameter, gauge and width for the ordered specification.
02
Edges are prepared and the plate is formed into a cylindrical shell over its full length, generally in a single or limited number of longitudinal seams.
03
The seam is closed by electric fusion welding (typically single or double submerged-arc welding), qualified to the procedure applicable to the ordered specification.
04
Heat treatment, sizing and straightening are carried out where the specification, wall thickness or service condition requires it.
05
The full weld seam and pipe body undergo the specified radiographic or ultrasonic examination, hydrostatic test and dimensional checks agreed for the project.
Request reviewed quotation Material documents on request
/ 02 — PRODUCT DETAIL
Built around the specification.
Key characteristics and commonly referenced standards from the supplied technical content master.
Key features01 02 03 04 05 06 07 08
Fully Documented Weld Procedure
Suited to Major Process Piping Projects
Post-Weld Heat Treatment Available
Full Radiographic / Ultrasonic Examination
Suitable for Corrosion-Resistant & High-Alloy Materials
Project-Specific Manufacture
Hydrostatically Tested
Common specification references
STD
ASTM A358 for austenitic stainless EFW pipe
STD
ASTM A928 for duplex stainless EFW pipe
STD
Project-specific dimensional standards
STD
Approved WPS and supplementary NDT clauses
Explore the pipes range
/ 03 — MATERIAL RANGE
Grades matched to the service.
Commonly requested families are shown below. Availability is confirmed against the complete specification.
Material familyAvailable materials and grades
Stainless SteelTP304, TP304L, TP316, TP316L, TP310S, TP317L, TP321, TP347, TP347H and TP904L
Duplex Stainless SteelUNS S31803 and UNS S32205 (2205)
Super Duplex Stainless SteelUNS S32750 (2507) and UNS S32760
Nickel AlloysAlloy 20, Alloy 28, Alloy 200, Alloy 201, Monel 400, Inconel 600, Inconel 601, Inconel 625, Inconel 718, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825, Hastelloy C276 and Hastelloy C22
TitaniumGrade 2 and Grade 5
Cupro NickelCuNi 90/10 (C70600) and CuNi 70/30 (C71500)
/ 04 — SUPPLY & CUSTOMISATION
Define the supply condition.
Final availability depends on the complete combination of material, dimensions, standard, condition, testing and quantity.
ParameterTypical information to specify
01Product Standard
ASTM A358 / A928 (material); project-specific dimensional standard
02Manufacturing Type
Electric Fusion Welded (plate-rolled, single/double submerged-arc weld)
03Size Range
14" NPS and above, including sizes beyond standard NPS charts (project-specific)
04Wall Thickness
Heavy wall, project-specific — confirmed against the approved drawing
05Length
Fixed length to the approved project drawing
06Ends
Bevelled per the project's approved weld procedure specification (WPS)
07Surface Finish
As required by project specification
08Marking
Standard mill marking
09Packaging
Export-worthy, project-specific crating and handling
/ 05 — DIMENSIONS & SIZE RANGE
Dimensions aligned to the manufacturing route.
EFW pipe is manufactured to project-specific diameter, wall thickness and length — there is no fixed catalogue size chart. Confirm dimensions against the project drawing, WPS and applicable code (e.g. ASME B31.3) at enquiry stage. A project data sheet can be issued once requirements are confirmed.
Sizing basisDiameterWall thicknessLength
Approved project drawing14" NPS and above; non-standard diameters availableHeavy wall, confirmed against approved drawingFixed project length
/ 06 — MANUFACTURING STANDARDS
Standards aligned for every order.
The material standard, dimensional standard and project requirements should be stated separately.
Primary material standards
StandardWhat it covers
ASTM A358 / A358MElectric-fusion-welded austenitic stainless steel pipe
ASTM A928 / A928MElectric-fusion-welded ferritic-austenitic (duplex) stainless steel pipe
Specification note
StandardWhat it covers
Grade-specific requirementsApplicable ASTM standards are available as per the material grade and product specification.
European standards
StandardWhat it covers
EN 10217-7Welded stainless steel pipe for pressure purposes
/ 06 — REFERENCE MATERIAL DATA
Reference material data.
Representative values for frequently requested stainless grades. Values are percentages by mass or minimum mechanical requirements unless shown otherwise; always verify the ordered material standard, product form and edition.
Chemical compositionSelected principal elements · % max or range
GradeCCrNiMoOther
304≤0.0818.0–20.08.0–11.0—Mn ≤2.0, Si ≤1.0
304L≤0.03518.0–20.08.0–13.0—Mn ≤2.0, Si ≤1.0
316≤0.0816.0–18.010.0–14.02.0–3.0Mn ≤2.0, Si ≤1.0
316L≤0.03516.0–18.010.0–14.02.0–3.0Mn ≤2.0, Si ≤1.0
310S≤0.0824.0–26.019.0–22.0—Mn ≤2.0, Si ≤1.5
317L≤0.03518.0–20.011.0–15.03.0–4.0Mn ≤2.0, Si ≤1.0
321≤0.0817.0–19.09.0–12.0—Ti: 5×C min–0.70
347≤0.0817.0–19.09.0–13.0—Nb+Ta: 10×C min–1.00
347H0.04–0.1017.0–20.09.0–13.0—Nb+Ta: 8×C min–1.00
904L≤0.0219.0–23.023.0–28.04.0–5.0Cu: 1.0–2.0
2205 (Duplex)≤0.0322.0–23.04.5–6.53.0–3.5N: 0.14–0.20
2507 (Super Duplex)≤0.0324.0–26.06.0–8.03.0–5.0N: 0.24–0.32
Inconel 625≤0.1020.0–23.0Balance (≥58)8.0–10.0Nb+Ta: 3.15–4.15
Incoloy 825≤0.0519.5–23.538.0–46.02.5–3.5Cu: 1.5–3.0
Hastelloy C276≤0.0114.5–16.5Balance (≥57)15.0–17.0W: 3.0–4.5, Fe: 4.0–7.0
Mechanical propertiesRoom-temperature minimums · verify the ordered product standard
GradeTensile strength (MPa, min)Yield strength (MPa, min)Elongation (%, min)Density (g/cm³)Melting range (°C)
304515205358.001400–1450
304L485170358.001400–1450
316515205358.001375–1400
316L485170358.001375–1400
310S515205357.981400–1450
317L485170358.001375–1400
321515205358.001400–1425
347515205358.031400–1425
347H515205358.031400–1425
904L490220358.001320–1390
2205 (Duplex)620450257.801350–1400
2507 (Super Duplex)795550157.801350
Inconel 625827414308.441290–1350
Incoloy 825586241308.141370–1400
Hastelloy C276690283408.891325–1370
/ 07 — INSPECTION & TESTING
Evidence before dispatch.
PMI (Positive Material Identification)
Confirms alloy chemistry matches the ordered grade.
Hydro Test
Hydrostatic pressure test to the specified test pressure and hold time.
UT (Ultrasonic Testing)
Detects internal discontinuities without damaging the pipe.
ET (Eddy Current Testing)
Nondestructive electric examination for surface and near-surface discontinuities, where specified.
RT (Radiographic Testing)
X-ray/gamma examination of welds or wall for internal defects.
IGC Test
Intergranular corrosion test (e.g. ASTM A262) for weld-sensitised austenitic grades.
Flattening Test
Confirms product ductility by flattening a representative sample section.
Flaring Test
Confirms end-forming ductility where required by the ordered product specification.
Hardness Test
Verifies hardness is within the limit specified for the grade/condition.
Third-Party Inspection
Witnessing/certification by agencies such as BV, SGS, TUV or Lloyd's.
EN 10204 3.1 Certification
Mill test certificate validated by the manufacturer's own inspection department.
PACKAGING & MARKING
Protected and traceable.
01Bundle Packing
02Wooden Boxes
03Export Crates
04Plastic End Caps
05Waterproof Wrapping
06Heat Number Identification
07Barcode (Optional)
/ 08 — APPLICATIONS & INDUSTRIES
Engineered for demanding service environments.
From process plants to marine systems, NESCO coordinates material, dimensions and documentation around the operating conditions of each application.
01
Oil & Gas02
Petrochemical
03
Chemical Processing04
Refineries
05
Power Plants
06
Heat Exchangers
07
Marine08
Offshore09
Water Treatment10
Desalination
11
Pharmaceutical12
Food Processing13
Sugar Industry14
Pulp & Paper15
Fertilizer Plants16
General EngineeringIndustries servedOne supply partner across critical sectors.
EPC ContractorsOEMsFabricatorsHeat Exchanger ManufacturersBoiler ManufacturersShipbuildingInfrastructure ProjectsProcess Plants
/ 09 — WHY NESCO PIPE & TUBES
Built for buyers who cannot leave details to chance.
From specification review to export documentation, NESCO coordinates the technical and commercial details as one complete supply requirement.
01
Wide Product Portfolio
Pipes, tubes, flanges, fittings, bars, sheets/plates and fasteners from one supplier.
02
Multi-Material Supply
Stainless, duplex, super duplex, nickel alloy, titanium and copper-nickel under one enquiry.
03
Mill Test Certificates
EN 10204 3.1 as standard, 3.2 with third-party witness where applicable.
04
Third-Party Inspection Support
Coordination with BV, SGS, TUV, Lloyd's and other agencies on request.
05
Reliable Sourcing
Established mill and stockist relationships for consistent availability.
06
Fast RFQ Response
Enquiries reviewed against the complete technical requirement, not just price.
07
Project Supply Expertise
Experience handling project packages alongside routine maintenance orders.
08
Export Documentation Support
Assistance with the paperwork needed for international shipment.
09
Custom Cutting & End Preparation
Subject to size, grade and quantity availability.
10
One-Stop Solution
A single point of contact for industrial piping product requirements.
/ 10 — FREQUENTLY ASKED QUESTIONS
Clear answers before you specify.
Quick guidance on product selection, standards, dimensions, inspection and documentation. For project-specific requirements, NESCO will review the complete enquiry with your team.
01What is the difference between Seamless and Welded pipes?
Seamless pipe is pierced from a solid billet and has no weld seam, giving uniform strength in all directions; welded pipe is formed from strip/plate and joined along a longitudinal seam, which allows a wider size range at a generally lower cost.
02When is EFW pipe used instead of standard Welded pipe?
EFW pipe is used when the required diameter or wall thickness exceeds what standard coil-fed welded production can practically achieve — typically large process headers and heavy-wall pressure piping, where the pipe is rolled from individual plate rather than coil.
03Which grade should I select?
Grade selection depends on the fluid handled, chloride content, pressure, temperature, fabrication method and the applicable project or code requirement. NESCO can quote the grade requested; final material selection remains with the project engineer.
04Do you provide EN 10204 3.1 certificates?
Yes, EN 10204 3.1 mill test certificates are provided as standard; 3.2 certificates with third-party witnessing can be arranged on request.
05Can you supply cut lengths?
Cut lengths are available subject to grade, size, quantity and manufacturing route — include the required length and tolerance in your enquiry.
06What standards do you follow?
Primarily ASTM/ASME material and dimensional standards, with EN equivalents available where specified. See the Manufacturing Standards section for the full list.
07Do you export internationally?
Yes, export packing and shipping documentation support are part of NESCO's standard service.
08Can third-party inspection be arranged?
Yes, inspection through agencies such as BV, SGS, TUV or Lloyd's can be coordinated when stated in the purchase order.
09What is the minimum order quantity?
This depends on the grade, size and whether the item is ex-stock or made-to-order; please share your requirement for a specific answer.
10Do you stock all grades?
Common grades are typically held ex-stock; less common alloys, large sizes and EFW pipe are generally sourced from the mill on a made-to-order basis.
11How can I request a quotation?
Use the Request for Quotation form on this page, or send your specification, drawing or bill of materials by email.
12What end preparations are available?
Plain end is standard on seamless and welded pipe; bevelled ends to ASME B16.25 (or the project WPS for EFW) and threaded ends are available subject to size and specification.
13Can NESCO supply Positive Material Identification (PMI) reports?
Yes, PMI testing can be arranged and reported alongside the mill test certificate when requested at enquiry stage.
/ 11 — REQUEST FOR QUOTATION Nesco direct sales desk
Ready to source?Start with the details you already have.
Our team will review the grade, dimensions, testing and delivery requirements together.