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Stainless Welded Pipes & Tubes
Stainless Welded Pipes & Tubes
Stainless Welded Pipes & Tubes｜Global Sourcing for Engineering & Procurement
1. Positioning and Scope
Stainless steel welded pipes and tubes cover a wide range of duties from utility to severe‑service: pressure or non‑pressure, ambient to high temperature, chloride‑bearing, acidic/alkaline media, sanitary and ultra‑high‑purity. Manufacture includes formed strip/plate + automatic welding (GTAW, PAW, laser) or electric‑fusion welding (EFW), followed by solution annealing, weld cold‑working where required, and pickling/passivation. Pipes use NPS × Schedule; tubes use OD × WT with tolerance grades.
Sectors include oil and gas, refining and chemicals, power and boiler, desalination and offshore, municipal water, food and pharma hygienic, semiconductor/UHP, mechanical and heat‑exchange services.
2. Standards Matrix (by product)
General and dimensional
· General requirements: ASTM A999 (Pipe), ASTM A1016 (Tube); certification to EN 10204. Pipe dimensions to ASME B36.19 (stainless), with ASME B36.10 for interface checks; Tube tolerances per ISO 1127. Cleaning and passivation per ASTM A380/A967.
Pressure welded stainless steel pipe (Pipe)
· Austenitic: ASTM A312 (automatic welding, typically without filler, solution annealed); large‑diameter/ heavy‑wall EFW to ASTM A358 (Class defines RT/UT coverage); ASTM A778 for “as‑welded” non‑severe service; ASTM A409 for large‑diameter corrosion or high‑temperature at lower pressures.
· Duplex / Super duplex: ASTM A790 (SMLS/Welded), ASTM A928 (EFW, Class‑based NDE).
· Waterworks: AWWA C220 (stainless‑steel pipe for water systems).
· Nickel & Ni‑alloys: ASTM B619 (welded Ni/Ni‑alloy pipe), ASTM B705 (welded Ni‑Fe‑Cr pipe); pair with ASTM B775 as general requirements.
Pressure/heat‑exchanger welded stainless tubing (Tube)
· Austenitic & heat‑resistant: ASTM A249 (HX/boiler/condenser; mandatory weld cold‑work then solution anneal), ASTM A269 (general service), ASTM A270 (sanitary; works with ASME BPE).
· Duplex / Super duplex: ASTM A789 (general service SMLS/Welded tubing).
· Nickel & Ni‑alloys: ASTM B626 (welded Ni‑alloy tubing).
EN/ISO/GB/JIS (often cross‑accepted with ASTM)
· EN 10217‑7 (stainless welded tubes for pressure), EN 10357 (sanitary), ISO 2037 (food industry).
· GB/T 12771 (stainless welded pipes for fluid service; austenitic/ ferritic/ duplex), GB/T 19228 (thin‑wall press‑fit stainless system).
· JIS G3459 (stainless steel pipes for piping), JIS G3463 (stainless steel tubes for boiler/heat‑exchanger).
3. “Scenario—Material—Standard—Size” Quick Map
· General corrosion‑resistant pressure service (−196 to 400 °C): 304L/316L to ASTM A312 (Pipe, 10S/40S/80S), typically NPS 1–24.
· Seawater, high‑chloride, desalination headers: 2205/2507 to ASTM A790 (Pipe); large headers/intakes by ASTM A358 EFW in 316L or 2205.
· Heat‑exchanger/boiler/condenser bundles: 304L/316L/317L/6Mo to ASTM A249 or A269 (Tube), with weld cold‑working + solution anneal; OD commonly 6–168 mm.
· Sanitary/food/pharma: 316L to ASTM A270 with ASME BPE (SF1 or SF4), or EN 10357; declare Ra.
· High‑temperature oxidation/reheat: 321/347/310S per ASTM A312; nickel alloys via ASTM B705 (e.g., 800H/800HT).
· Sour or strong corrosion: Duplex to ASTM A790/A928 (Pipe) or nickel to ASTM B619/B626 (625/825/C‑276/C‑22); verify NACE MR0175/ISO 15156 compliance.
· Waterworks/municipal: AWWA C220; typical NPS ≥4.
4. Size Range and Tolerances
· Pipe (A312/A790/B619 etc.): NPS 1/8–30 standard (5S/10S thin walls; 40S/80S common). Large‑OD heavy‑wall EFW to ASTM A358/A928 for very large diameters—confirm limits with manufacturer.
· Tube (A249/A269/A270/A789/B626): OD ~6–168 mm, WT 0.5–5 mm, length 6/12 m.
· Dimensional systems: Pipes per ASME B36.19 (stainless), interfaces with ASME B36.10.
· For EN/ISO projects using stainless steel tubes (metric series), dimensions and tolerances follow EN ISO 1127 (D-classes for OD, T-classes for WT, straightness and ovality levels to be specified in the PO).
• For ASTM/ASME projects:
(1) Pipe: dimensional series per ASME B36.10/B36.19; tolerances per ASTM A999 (e.g., ASTM A312 follows A999).
(2) Tube: tolerances per ASTM A1016 (applicable to ASTM A213, A269, A270, A789, etc.).
(3) Sanitary: per ASME BPE or EN 10357.
(4) Waterworks large-diameter: per AWWA C200.
Editions and selections shall be locked in the purchase order; avoid cross‑system mixing.
5. Manufacturing and Key Controls
· Forming & welding: Plate/strip forming + GTAW/PAW/laser for automatic welding; EFW (A358/A928) for large‑OD heavy‑wall. A312 requires automatic welding, typically without filler; A358/A928 are EFW classes.
· Weld conditioning & heat treatment: A249 mandates weld cold‑working (roller/planishing) then solution anneal; austenitic and most Ni‑alloys solution‑annealed ≥1040 °C and quenched; duplex requires phase control, avoiding σ‑phase.
· Surface & cleanliness: Pickling/passivation per ASTM A380/A967; sanitary/BPE or EN 10357 to declare Ra and cleanliness targets.
6. Quality, Testing and Documentation
· General: Pipe to ASTM A999; Tube to ASTM A1016. Hydrostatic or full‑length ECT/UT (or both) per contract.
· NDE: UT per ASTM E213; ECT per ASTM E426/E570; nickel alloys may use ASTM E571; EFW welds to A358/A928 Class‑specified RT/UT coverage.
· Mechanical & process tests: A249 requires flattening, flaring, reverse‑bend and hardness tests.
· Corrosion & phase: Austenitic IGC to ASTM A262 (Practice E); duplex per ASTM A923 (Methods A/B/C) and ASTM G48 with declared temperature; ferrite measured on base metal and welds.
· Documents: EN 10204 (3.1/3.2), heat‑treatment charts, weld map, NDE and pressure test records, PMI; EU PED and EN 13480/13445; DE AD 2000/VdTÜV as applicable.
7. Supply Forms and Packaging
Fixed lengths 6 m or 12 m with end caps; pickled/passivated ID/OD. Sanitary/UHP can be SF1 or SF4 electropolished with clean packaging. Large‑OD EFW supplied in sections with prepared bevels and site weld recommendations.
8. RFQ/PO Checklist
1. Spec & grade: e.g., ASTM A312 TP316L / ASTM A790 S32205 / ASTM B619 N06625。
2. Dimensional system: Pipe as NPS × Schedule (ASME B36.19); Tube as OD × WT × ISO 1127 tolerance.
3. Welding & weldment: GTAW/PAW/laser/EFW, ID bead removal; A249 weld cold‑work requirement.
4. Heat treatment: Solution‑anneal temperature/quench; duplex phase target window.
5. Inspection: Hydro or 100 % ECT/UT/RT; A249 mechanical tests; duplex A923/G48; TPI if needed.
6. Surface & hygiene: A380/A967; ASME BPE/EN 10357 Ra/SF targets; EP if SF4 required.
7. Docs: EN 10204 3.1/3.2; HT/NDE/pressure/PMI; PED/AD 2000 if applicable。
8. Marking/traceability: UNS + Werkstoff, heat/batch, weld map.
9. Capability limits: If OD > NPS 30 or heavy‑wall, define A358/A928 Class and NDE coverage.
9. Risks and “Do/Don’t”
· Do not substitute A312 for duplex pressure pipes—use A790/A928.
· A778 is only for non‑severe service; do not use in stringent pressure/corrosion duties.
· Sanitary orders must state ASME BPE/EN 10357 Ra/SF and weld conditioning—”sanitary” alone is insufficient.
· Skipping A249 weld cold‑work + solution anneal severely reduces corrosion resistance。
· Avoid 316L in seawater/high‑Cl⁻; choose 2205/2507/6Mo.
· Nickel orders should include B775/B751/B829 general requirements to avoid delivery gaps.
10. Sample RFQ/PO Lines
· Desalination high‑pressure (Duplex)
“Pipe, ASTM A790 S32205, NPS 8 Sch40S, solution annealed, UT per E213 100 % + ET per E426 100 %, ASTM G48A @ 25 °C pass, 100 % PMI, EN 10204 3.1; end‑capped, pickled & passivated per A380/A967.”
· Heat‑exchanger bundle (Austenitic Tube)
“Tube, ASTM A249 TP316L, OD 19.05 × 1.65 mm × 12 m, weld cold‑worked then solution annealed, flattening/flaring/reverse‑bend/hardness per A249, hydro per A1016, CMTR 3.1.”
· Sanitary process (ASME BPE)
“Tube, ASTM A270 316L, ID Ra ≤ 0.5 µm (SF1) or electropolished SF4, cleaned & passivated per A380/A967, 100 % PMI, end‑capped and clean‑bagged, CMTR 3.1.”
· Large header (EFW)
“Pipe, ASTM A358 Class 1 (project‑defined Class), material 316L or S32205, NPS 36, EFW welded, RT/UT per Class, solution annealed, pickled & passivated, EN 10204 3.2.”
Stainless Welded Pipes & Tubes｜Technical Specifications
Scope: Welded Pipes (NPS × Schedule) and Tubes (OD × WT × tolerance) made from stainless steel strip/plate by automatic welding (GTAW/PAW/Laser/ERW/EFW). Covers austenitic, ferritic/martensitic, duplex/super duplex, and nickel & nickel-alloy systems. For pressure and non-pressure service, heat-exchangers/condensers/boilers, sanitary and hygienic service, seawater/desalination, chemical and general mechanical applications.
1) Definitions
• Pipe: pressure service, sized by ASME B36.19M (stainless, incl. 5S/10S/40S/80S) or B36.10M if applicable.
• Tube: HX/boiler/sanitary/instrumentation, sized by ISO 1127 (OD/WT tolerances).
2) Codes & Product Standards (Pipe vs Tube; austenitic, duplex, nickel; incl. GB & EN/DIN)
2.1 Pipes (Pressure)
• Austenitic:
ASTM A312 / ASME SA-312 (autogenous automatic weld + solution anneal; A999 general req).
ASTM A358 / SA-358 (large OD/Thk EFW, Class 1–5 RT/UT levels).
ASTM A778 (“as-welded” austenitic for non-stringent pressure/corrosion).
• Duplex/Super Duplex:
ASTM A790 / SA-790 (SMLS/Welded duplex pipes).
ASTM A928 / SA-928 (duplex EFW pipes, large OD/Thk; Classed).
• Nickel & Ni-Alloys:
ASTM B619 / SB-619 (welded Ni/Ni-alloy pipes; specify UNS).
ASTM B705 / SB-705 (welded Ni-Fe-Cr pipes — Alloy 800/800H/800HT).
General req: ASTM B775 (pipes).
Sizing: ASME B36.19M; thin-wall series 5S/10S; otherwise refer to B36.10M as needed.
2.2 Tubes (Pressure/HX/Sanitary)
• Austenitic/Ferritic/Heat-resisting:
ASTM A249 (welded and cold-worked HX/boiler/condensor tubes — mandatory cold-working of weld then solution anneal).
ASTM A269 (general SS tubes; A1016 general req).
ASTM A270 (sanitary tubes; with ASME BPE SF1/SF4 for surface finish).
• Duplex/Super Duplex:
ASTM A789 / SA-789 (SMLS/Welded duplex tubes; with A1016).
• Nickel & Ni-Alloys:
ASTM B626 / SB-626 (welded Ni/Ni-Co-Cr-Mo tubes — C-276/C-22/625).
ASTM B704 / SB-704 (welded Ni-Fe-Cr tubes — 800 series).
ASTM B725 / SB-725 (welded Ni/Ni-alloy tubes — general).
General req: ASTM B751 (tubes), ASTM B829 (general).
• EN/DIN (EU/Germany):
EN 10217-7 (welded stainless tubes for pressure).
EN 10357 (ex-DIN 11850 / ISO 2037 — hygienic welded tubes), with EN 10372 weld tests.
EN 10296-2 (welded stainless circular tubes for mechanical applications).
EN 10312 (welded SS tubes for aqueous liquids incl. potable).
DIN 17457 (withdrawn; replaced by EN 10217-7 / EN 10296-2).
• JIS / GB (China):
JIS G3459 (corrosion-resisting pipes incl. duplex like SUS329J3L); JIS G3463 (boiler/HX).
GB/T 12771 (welded SS pipes for fluid), GB/T 19228 (thin-wall press-fit SS tubes for buildings).
3) Materials & Mapping (UNS / Werkstoff)
• Austenitic: 304/L (S30400/3), 316/L (S31600/3), 321, 347/347H, 310S, 904L (N08904), 254SMo (S31254 / 1.4547).
• Duplex/Super Duplex: 2205 (S32205 / 1.4462), 2507 (S32750 / 1.4410; S32760 / 1.4501).
• Ferritic/Martensitic: 430 (1.4016), 444 (1.4521), 410 (1.4006).
• Nickel & Ni-Alloys: 625 (N06625 / 2.4856), 825 (N08825 / 2.4858), 800H/HT (N08810/11 / 1.4876), C-276 (N10276 / 2.4819), C-22 (N06022 / 2.4602), Monel 400 (N04400 / 2.4360/61), Ni200/201 (N02200/201 / 2.4060/61).
Use the correct spec: Duplex pipes → A790/A928 (not A312); duplex tubes → A789. Nickel alloy pipes/tubes per B619/B705 and B626/B704/B725 (+ B775/B751/B829).
4) Manufacturing & Process Controls
• Forming/Welding: Roll/form → GTAW/PAW/Laser; large OD/Thk EFW (A358/A928). A312 typically autogenous automatic welding; A358/A928 allow filler (EFW).
• Weld conditioning: A249 mandates cold-working of the weld (roller expansion/planishing) before solution anneal; sanitary tubes may require ID bead removal & polishing.
• Heat treatment: Austenitic & most Ni-alloys ≥1040 °C solution anneal + rapid quench; duplex requires phase balance (avoid sigma/secondary phases); stress-relief for tight bends/U-bends when specified.
• Cleaning/Passivation: ASTM A380/A967; for sanitary per ASME BPE/EN 10357 with SF1/SF4 and Ra limits.
5) Dimensions & Tolerances
• Pipes: common NPS 1/8–30 (B36.19M 5S/10S/40S/80S); A358/A928 EFW up to ~110” OD subject to mill capability.
• Tubes: typical OD 6–168 mm, WT 0.5–5 mm, L 6/12 m.
• Sanitary: ASME BPE / EN 10357 surface finish & Ra (e.g., SF1/SF4).
· For EN/ISO projects using stainless steel tubes (metric series), dimensions and tolerances follow EN ISO 1127 (D-classes for OD, T-classes for WT, straightness and ovality levels to be specified in the PO).
• For ASTM/ASME projects:
(1) Pipe: dimensional series per ASME B36.10/B36.19; tolerances per ASTM A999 (e.g., ASTM A312 follows A999).
(2) Tube: tolerances per ASTM A1016 (applicable to ASTM A213, A269, A270, A789, etc.).
(3) Sanitary: per ASME BPE or EN 10357.
(4) Waterworks large-diameter: per AWWA C200.
Editions and selections shall be locked in the purchase order; avoid cross‑system mixing.
6) QA/QC
• General req: A999 (pipes) / A1016 (tubes) — hydrostatic test per piece or 100% NDE (ET/UT); contract shall state which or both.
• NDE:
• Stainless: UT—ASTM E213, ET—ASTM E426/E570
• Nickel alloys: ET—ASTM E571 (+ UT/RT as required)
• EFW classes (A358/A928) define RT/UT coverage.
• Mechanical/technological: A249 flattening/flaring/reverse-bend/hardness.
• Corrosion/phase: ASTM A262 (IGC) for austenitic; ASTM A923 (A/B/C) and ASTM G48 for duplex (state method/temperature); ferrite 35–65% on BM/Weld; NACE MR0175/ISO 15156 for sour.
• Documentation: EN 10204 3.1/3.2, heat-treatment charts, weld map, NDE records, pressure test, PMI per API RP 578. EU: PED 2014/68/EU, EN 13480/13445; DE: AD 2000 / VdTÜV as applicable.
7) Service → Spec/Material Mapping
• General corrosion/pressure (-196…400 °C): A312 304L/316L (10S/40S/80S).
• Seawater/high-Cl⁻/desalination: A790 2205/2507; large headers/intakes by A358 316L/2205 EFW.
• HX/boiler/condensers: A249/A269 304L/316L/317L/6Mo (weld-cold-worked + solution annealed).
• Sanitary/food/pharma: A270 316L + ASME BPE (SF1/SF4; Ra declared); EU EN 10357 optional.
• High-temp oxidation/reheat: A312 321/347/310S, nickel via B705 (800H/HT).
• Sour/strong corrosion: Duplex (A790/A928) or Nickel (B619/B626) — 625/825/C-276/C-22; NACE compliance.
8) RFQ/PO Checklist
1. Spec + Grade (e.g., ASTM A312 TP316L (UNS S31603) / ASTM A790 S32205 (1.4462) / ASTM B619 N06625 (2.4856)).
2. Sizing system: Pipe by ASME B36.19M (NPS×Sch); Tube by ISO 1127 (OD×WT×D/T tol).
3. Welding/weldment: GTAW/PAW/Laser/EFW; ID bead removal; A249 weld cold-working requirement.
4. Heat treatment: solution-anneal temperature/quench; duplex phase control.
5. Inspection: Hydro vs 100% ET/UT/RT; A249 mech tests; duplex A923/G48; third-party witness.
6. Surface & hygiene: A380/A967; ASME BPE/EN 10357 with Ra/SF targets; electropolish (if SF4).
7. Docs: EN 10204 3.1/3.2, HT/NDE/pressure/PMI; PED/AD 2000 (if applicable).
8. Marking/traceability: UNS + Werkstoff on stamping; heat/batch; weld map.
9. Capability limits: if OD > NPS 30, define A358/A928 Class and NDE coverage.
9) Risk List
• Using A312 for duplex pipes → use A790/A928.
• Substituting A778 in severe pressure/corrosion service.
• Sanitary tubes without ASME BPE/EN 10357 Ra/SF and weld conditioning.
• Missing A249 weld cold-working + solution-anneal.
• Selecting 316L for high-Cl⁻ seawater → risk of Cl-SCC/pitting; choose 2205/2507/6Mo.
• Nickel orders without B775/B751/B829 general requirements.
• EU jobs without PED/EN 10204; DE jobs ignoring AD 2000/VdTÜV.
• Referencing DIN 17457 as current → replace with EN 10217-7 / EN 10296-2.
10) Example Spec Lines
(See Chinese section — identical content mirrored.)
11) Supply, Packing & Marking
• PE/BE ends; sanitary caps; large OD protectors. Dry/VCI packing; anti-scratch.
• Stamping: grade (UNS/Werkstoff), size, heat, spec, inspection status; deliver with 3.1/3.2 and NDE/pressure records.
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