Excellent Corrosion Resistance
Product formPipes
/ 01 — TECHNICAL OVERVIEW
Stainless Steel & High Nickel Alloy Seamless Pipes
Manufacturer, Supplier & Exporter of specification-led seamless pipe for critical industrial service.
NESCO Pipe & Tubes supplies stainless steel seamless pipes for process, pressure and structural piping systems across the oil & gas, petrochemical, power, marine and general process industries. Seamless pipe is manufactured without a longitudinal weld seam: a solid steel billet is pierced or extruded into a hollow shell, then hot-finished and, where required, cold drawn to the specified outside diameter and wall thickness, followed by solution heat treatment, straightening and final inspection. The absence of a weld seam gives the pipe a uniform circumferential structure, which is a key reason it is preferred for high-pressure, high-temperature and critical-service applications where weld-related weak points must be avoided.
The main advantages of seamless construction are consistent wall thickness, high pressure-holding capability, strong performance across a wide temperature range, and reliable behaviour under cyclic or dynamic loading. These pipes are typically specified in process lines, refineries, chemical and petrochemical plants, power generation and steam systems, marine and offshore piping, and general industrial fabrication, wherever the specifying engineer needs a proven, code-recognised product with a long service history.
Industries prefer seamless stainless pipe because it combines corrosion resistance with dependable mechanical performance and is backed by long-standing ASTM and ASME specifications that most purchasing and engineering standards already recognise. NESCO Pipe & Tubes supports this with a wide grade range, specification-led order review, mill test certificate support, and inspection coordination including PMI and third-party witnessing — making NESCO a practical single-point source for both routine maintenance orders and larger project packages.
How it is made
01
Solid stainless steel billet selected and verified by heat and chemistry.
02
Billet is rotary-pierced or extruded into a hollow shell without a weld seam.
03
Solution annealing restores corrosion resistance and required grain structure.
04
Hot finishing and, where specified, cold drawing bring the pipe to final OD and wall.
05
Pipe is straightened to the tolerance required by the governing dimensional standard.
06
Surface is pickled and passivated to remove scale and restore the passive oxide layer.
07
Dimensional, visual, hydrostatic and any specified NDT checks are carried out.
08
Heat-wise bundling, end protection and export-worthy packing for dispatch.
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
High Pressure Capability
High Temperature Performance
Superior Mechanical Strength
Excellent Weldability
Long Service Life
Low Maintenance
Wide Material Availability
Common specification references
STD
ASTM A312 / ASME SA312 material specification
STD
ASME B36.19M dimensional specification
STD
ASME B16.25 bevelled-end preparation
STD
Project-specific supplementary inspection requirements
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 A312 / ASME SA312 (material); ASME B36.19M (dimensions)
02Manufacturing Type
Seamless (hot pierced / extruded, cold drawn where required)
03Size Range
1/8" NPS to 24" NPS (larger sizes on enquiry)
04Wall Thickness
Schedule 5S to Schedule XXS
05Length
Single Random (5–7 m), Double Random (11–13 m), or Fixed Cut Length
06Ends
Plain End (PE); Bevelled End (BE) to ASME B16.25; Threaded on request
07Surface Finish
Annealed & Pickled (standard); Bright Annealed or Polished on request
08Marking
Standard mill marking
09Packaging
Export-worthy bundling, end protection and crating
/ 05 — DIMENSIONS & SIZE RANGE
Dimensions aligned to the manufacturing route.
Complete nominal-size coverage for the published 1/8" to 24" NPS supply range. Schedule availability from 5S to XXS depends on NPS, material grade and the governing dimensional standard and is confirmed at enquiry stage.
NPSOutside diameter (mm)Nominal sizeAvailable wall basis
1/8"10.3DN 6Schedule / specified wall
1/4"13.7DN 8Schedule / specified wall
3/8"17.1DN 10Schedule / specified wall
1/2"21.3DN 15Schedule / specified wall
3/4"26.7DN 20Schedule / specified wall
1"33.4DN 25Schedule / specified wall
1 1/4"42.2DN 32Schedule / specified wall
1 1/2"48.3DN 40Schedule / specified wall
2"60.3DN 50Schedule / specified wall
2 1/2"73.0DN 65Schedule / specified wall
3"88.9DN 80Schedule / specified wall
3 1/2"101.6DN 90Schedule / specified wall
4"114.3DN 100Schedule / specified wall
5"141.3DN 125Schedule / specified wall
6"168.3DN 150Schedule / specified wall
8"219.1DN 200Schedule / specified wall
10"273.0DN 250Schedule / specified wall
12"323.9DN 300Schedule / specified wall
14"355.6DN 350Schedule / specified wall
16"406.4DN 400Schedule / specified wall
18"457.0DN 450Schedule / specified wall
20"508.0DN 500Schedule / specified wall
22"559.0DN 550Schedule / specified wall
24"610.0DN 600Schedule / specified wall
/ 06 — MANUFACTURING STANDARDS
Standards aligned for every order.
The material standard, dimensional standard and project requirements should be stated separately.
Material standards
StandardWhat it covers
ASTM A312 / A312MSeamless austenitic stainless steel pipe
ASTM A790 / A790MSeamless ferritic-austenitic (duplex) stainless steel pipe
ASTM B167Inconel 600 / 601 seamless pipe and tube
ASTM B444Inconel 625 seamless pipe and tube
ASTM B407Incoloy 800 / 800H / 800HT seamless pipe and tube
ASTM B423Incoloy 825 seamless pipe and tube
ASTM B466 / B466MCu-Ni seamless pipe and tube
Dimensional standards
StandardWhat it covers
ASME B36.10MWrought steel pipe dimensions
ASME B36.19MStainless steel pipe dimensions
European standards
StandardWhat it covers
EN 10216-5Seamless 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.
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.
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.