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Industries OverviewThe company's products are primarily used in industrial equipment sectors such as nuclear power, petroleum, petrochemicals, chemical engineering, power generation, automotive manufacturing, shipbuilding, fertilizer production, pharmaceuticals, papermaking, sugar refining, and machinery manufacturing. -
Products & SolutionsOur Products: Ferrous metal ore raw materials (nickel ore, ferronickel, ferrochrome, ferromanganese, ferrosilicon, etc.), seamless pipes, welded pipes, medium-thick plates, plate coils, bars, wire rods, wire coils, pipe fittings, flanges, castings, etc. -
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Process VisualizationThe company's products are primarily used in industrial equipment sectors such as nuclear power, petroleum, petrochemicals, chemical engineering, power generation, automotive, shipbuilding, fertilizer production, pharmaceuticals, papermaking, sugar refining, and machinery manufacturing. -
About UsTsisco Industrial Ltd. was established in 2010. Originating from the Tsingshan ecosystem’s Shanghai platform, the company now operates independently and focuses on global supply-chain integration, distribution, and import/export of steel and alloy materials. We achieved ISO 9001 certification from TÜV Rheinland in 2012, and ISO 9001, ISO 14001 and ISO 45001 certifications from LRQA in 2022. These accreditations underpin continuous improvement and stable performance in quality, environment, and occupational health & safety.
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Products & Solutions
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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