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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
Precision Tubes
Precision Tubes
Precision Tubes (Stainless/Duplex/Carbon & Alloy/Nickel Alloys/Titanium)｜Global Sourcing for Engineering & Procurement
1. Product Positioning & Application Scope
“Precision tubes” are metallic tubes manufactured by cold drawing, cold rolling (including pilger), or precision welding with subsequent cold sizing to achieve tight dimensional tolerances, controlled inner/outer surface quality, and cleanliness. They are intended for instrumentation and control, hydraulic and pneumatic systems, automotive and machinery, boilers and heat exchangers, sanitary and high-purity systems, offshore and chemical service, as well as medical micro-tubing—applications where accuracy, cleanliness, and repeatability matter. Unlike “pipes” for bulk pressure transport, precision tubes focus on geometry and function and are normally specified by OD and wall thickness under Tube/Mechanical-Tubing standards. Materials cover carbon and low-alloy steels, stainless steels (austenitic, ferritic, martensitic, duplex), high-nickel alloys, and titanium. Dimension and tolerance systems follow ISO 1127 (stainless steel tubes), the EN 10305 family, and ASTM A269/A213/A632 where applicable.
2. Standards Matrix (by material family & use)
(1) Stainless steels (including duplex)
a) General & instrumentation: ASTM A269 (seamless and welded austenitic SS tubing); apply ASTM A1016 for general requirements. ISO 1127 or A269 tolerance clauses may be used.
b) Boilers & heat exchangers: ASTM A213 (seamless ferritic and austenitic alloy steel tubes for boiler, superheater, and heat-exchanger service); general requirements ASTM A1016.
c) Small-diameter or thin-wall: ASTM A632.
d) Duplex stainless: ASTM A789; general requirements ASTM A1016.
e) Ferritic stainless: ASTM A268.
f) Sanitary & hygienic: ASTM A270 (sanitary tubing) with ASME BPE (more stringent cleanliness/surface criteria for A270 S2); EN 10357 is the European hygienic counterpart; ISO 2037 is still referenced in some projects.
g) Pressure purposes: EN 10216-5 (seamless stainless) and EN 10217-7 (welded stainless).
h) China GB standards: GB/T 14976 (stainless seamless for fluid), GB/T 13296 (stainless seamless for boiler & heat-exchanger), GB/T 12771 (stainless welded for fluid).
i) JIS standards: JIS G3459 (stainless steel pipes for general service) and JIS G3463 (boiler & heat-exchanger tubes).
(2) Carbon & low-alloy steels (mechanical, hydraulic & pneumatic)
a) Seamless mechanical: ASTM A519.
b) ERW mechanical: ASTM A513.
c) EN precision series: EN 10305-1/-2/-3/-4/-5/-6 as defined (seamless cold-drawn; welded cold-drawn; welded precision; seamless for hydraulic/pneumatic; welded for hydraulic/pneumatic; welded special sections).
d) China: GB/T 3639 (cold drawn or cold rolled precision seamless steel tubes).
e) General requirements: ASTM A450 for carbon & low-alloy tubing.
(3) Nickel and high-nickel alloys, titanium
a) Nickel & high-nickel: ASTM B163 (condenser/heat-exchanger), ASTM B167 (Ni-Cr-Fe alloys such as 600/625/800 series), ASTM B444 (N06625), ASTM B622 (C-276 and similar), ASTM B165 (Monel 400).
b) Titanium: ASTM B338.
(4) High-purity & medical micro-tubing (supplementary)
a) Semiconductor & UHP gases: ASME BPE requirements, SEMI E49 family, SEMI F1 (leak integrity) are commonly invoked.
b) Medical needle tubing: ISO 9626.
3. Scenario–Material–Standard–Size Mapping (quick guide)
1. Petrochemical instrumentation & control (onshore/offshore, including sour):
Material: 316L/304L; use duplex 2205 for chloride SCC risk.
Standards: ASTM A269 or ASTM A213 for stainless; ASTM A789 for duplex; comply with NACE MR0175 (ISO 15156) when sour.
Sizes: OD 6–25.4 mm, WT 0.9–2.0 mm; coils or straight; tolerances per ISO 1127 D3/T3 or A269.
2. Hydraulics & pneumatics:
Material: precision carbon/low-alloy steel.
Standards: EN 10305-4 (seamless), EN 10305-5 (welded); North America often uses ASTM A519/A513.
Sizes: OD 6–80 mm, WT 1–8 mm; cleanliness and anti-rust film controlled.
3. Boilers & heat exchangers:
Material: 304/316/321/347 stainless; Ni alloys 600/625/800 series, C-276, etc.
Standards: ASTM A213 (stainless), ASTM B163/B167/B444/B622 (Ni alloys); China projects: GB/T 13296.
Sizes: OD 12.7–38 mm, WT 0.7–3.0 mm.
4. Sanitary food & pharma:
Material: 316L (low-S), sometimes 304L.
Standards: ASTM A270 plus ASME BPE; EN 10357 as EU counterpart; ISO 2037 may still appear.
Sizes: OD 12.7–101.6 mm, WT 0.89–2.11 mm; Ra and EP per BPE.
5. Semiconductor & UHP gases:
Material: 316L UHP grade (duplex/Ni alloys per media).
Standards: ASTM A269 base metal; ASME BPE and SEMI E49/E49.6/E49.7, SEMI F1 for cleanliness/leak.
Sizes: OD 1/4 in to 1 in, WT 0.035–0.065 in; EP/BA, double-bag clean packaging.
6. Medical needle & micro-tubing:
Material: 304/304L/316L.
Standard: ISO 9626.
Sizes: OD 0.3–3.0 mm; verify thin wall integrity.
7. Seawater/high-chloride:
Material: 2205/2507; where needed, Ni alloy or titanium.
Standards: ASTM A789 (duplex), ASTM B444/B622 (Ni), ASTM B338 (Ti).
Sizes: OD 10–60 mm typical.
8. Automotive & general machinery precision tubes:
Material: carbon/low-alloy steel.
Standards: EN 10305-1/-2/-3; China: GB/T 3639.
Sizes: OD 6–80 mm, WT 0.8–6 mm.
4. Size Range & Tolerances (typical engineering window; finalize per standard and mill capability)
• Outside diameter: 0.30–60 mm (typical 1.0–25.4 mm; project-dependent extensions up to ~76 mm are possible).
• Wall thickness: 0.05–5.0 mm (commonly 0.1–2.0 mm).
• Length: Straight lengths 4–8 m; small diameters can be supplied as coiled tubing, single-coil length about 30–1500 m (size-dependent).
• Straightness: Typically ≤0.5 mm/m; high-precision ≤0.15–0.30 mm/m (confirm per project).
• Ovality and eccentricity: Recommended ovality ≤50% of the outside-diameter tolerance; wall-thickness eccentricity ≤10–12.5% (as agreed by project and standard).
• Internal surface roughness: Bright annealed (BA) typically Ra 0.4–0.8 μm; electropolished (EP) up to Ra ≤0.20–0.38 μm (e.g., when complying with ASME BPE SF4).
• Unified tolerance system: Prefer ISO 1127 with D3/D4 (diameter) + T3/T4/T5 (wall). For mechanical/hydraulic service, EN 10305 “precision/extra-precision” grades or engineering equivalents such as h9/h10 may be specified. It is also acceptable to adopt the applicable tolerance clauses of ASTM A269, ASTM A213, or ASTM A789 per the product standard, provided the adopted standard and grade are explicitly stated in the purchase documents.
5. Manufacturing & Key Controls
Seamless route: hollow → multi-pass cold drawing/rolling → solution/anneal (duplex phase balance) → pickling/passivation or BA → straightening/stress relief → ET/hydro as required.
Welded route: ERW/TIG → bead removal & cold sizing → heat treatment & surface finishing → NDE & hydro.
Sanitary/UHP: control inner Ra and EP, low-S 316L, hydrocarbon residue/particle control, double-bag clean packaging (per ASME BPE/SEMI).
6. Quality & Documentation
Chemistry/mechanical per product standards; apply ASTM A1016 (stainless/duplex) or ASTM A450 (carbon/low-alloy) as general requirements.
Corrosion & phase balance: A262 (IGC) for austenitic when specified; ASTM A923 & ASTM G48 for duplex; A380/A967 for pickling/passivation in sanitary service.
NDE: EN ISO 10893 series or ASTM equivalents for ET/UT/PT; hydro for pressure service.
Docs: EN 10204 3.1/3.2; BPE/SEMI surface/cleanliness records and He-leak if required.
7. Supply Forms & Packaging
Straight lengths, coils, UHP double-bag clean sealing; protected ends; labels with heat number/grade/size/tolerance/testing status. Sanitary/UHP logistics require anti-shock/dust/moisture controls.
8. RFQ/PO Checklist
Service & media (temperature/pressure/cleanliness, sour or not);
Material & standard (e.g., 316L ASTM A269 or A213; S32205 ASTM A789; EN 10305-4; B163/B444/B622; B338);
Size & tolerance (OD×WT×L; ISO 1127 D/T class or A269/A213/A789 clauses; limits for straightness/ovality/eccentricity);
Surface & condition (HRAP/BA/EP; deburring and end finish);
Inspection & docs (NDE scope, hydro/helium, IGC/A923/G48, PMI, EN 10204 3.1/3.2, BPE/SEMI records);
Packaging & labeling (end caps, desiccants, double-bag, crates).
9. Procurement/Installation/O&M Risk Alerts
Do not substitute ASTM A554 decorative/mechanical tubing for pressure or sanitary/UHP service.
Lock tolerances per ISO 1127 or product standards to avoid leaks in ferrule fittings/automation.
Meet ASME BPE/ASTM A270 S2 for inner surface/low-S to avoid CIP/SIP corrosion or particle issues.
Observe NACE MR0175 for sour service selection/hardness control;
Qualify duplex via A923/G48 & ferrite balance;
Apply SEMI/BPE cleanliness and leak-tightness for UHP lines.
10. Representative Line Items (copy-ready)
1. “Precision instrumentation tubing, 316L, ASTM A269, 12.7 mm OD × 1.24 mm WT × 6 m, BA finish, ISO 1127 D3/T3 tolerances, 100% ET, EN 10204 3.1, capped ends.”
2. “Hydraulic cold-drawn precision tube, EN 10305-4, E355, 25 mm OD × 3 mm WT × 6 m, controlled inner cleanliness and anti-rust oil, NDE per EN ISO 10893, MTC 3.1.”
3. “Sanitary stainless tube, 316L (low-S), ASTM A270 + ASME BPE, 38.1 mm OD × 1.65 mm WT × 6 m, EP, Ra ≤ 0.5 µm, clean double-bag, surface/cleanliness reports, MTC 3.1.”
4. “Duplex precision tube, S32205, ASTM A789, 19.05 mm OD × 1.65 mm WT × 6 m, solution-annealed & pickled, ferrite 35%–65%, A923 & G48 sampling, MTC 3.1.”
5. “Nickel alloy HEX tube, N06625, ASTM B444, 19.05 mm OD × 1.65 mm WT × 6 m, solution annealed, NDE per standard, MTC 3.1.”
Precision Tubes (Stainless/Duplex/Carbon & Alloy/Nickel Alloys/Titanium)｜Technical Specifications
1) Definition & Scope
Cold-worked (drawn/rolled/flow-formed) tubes with subsequent heat treatment targeting tight OD/WT/ID tolerances, concentricity, straightness, surface finish/cleanliness, and leaktightness.
Applications: instrumentation & control, analytics & semiconductor (UHP gases), medical & lab, hydraulic/pneumatic, EV/automotive thermal/fluid, precision mechanics, compact HX/steam-condensate, etc.
2) Standards Matrix (incl. GB/EN/ASTM/JIS where relevant)
Stainless / Duplex (pressure/general/sanitary)
• ASTM A269, ASTM A632 (small dia. austenitic), ASTM A213 (boiler/HX), ASTM A270 + ASME BPE (sanitary), ASTM A789 (duplex/Fe-Ni-Cr)
• EN 10216-5 (SMLS pressure), EN 10217-7 (welded pressure), EN 10357 (food/sanitary, ex-DIN 11850)
• ISO 1127 (size/tolerance for stainless)
• GB/T 14976 (stainless seamless for fluids), GB/T 13296 (boiler/HX stainless seamless), GB/T 12771 (stainless welded for fluids)
Mechanical / Hydraulic-Pneumatic
• EN 10305-1/-2/-3/-4/-6 (precision tubes; -4 for hydraulic/pneumatic)
• ASTM A519 (carbon/alloy SMLS mechanical), ASTM A511 (stainless SMLS mechanical)
• GB/T 3639 (cold drawn/rolled precision seamless), GB/T 8713 (hydraulic/pneumatic precision seamless)
Nickel & Titanium
• ASTM B163/B165/B167/B444/B622 (Ni/Monel/600/625/Hastelloy)
• ASTM B338 (titanium tubes) ; GB/T 3624/3625 (Ti seamless)
Medical microtubes
• ISO 9626, ASTM A908 (hypodermic tubing)
General requirements / NDT
• ASTM A1016 (general for stainless/nickel), ASTM A450 (carbon steel general), EN ISO 10893 (NDT suite)
3) Materials & Grades
Austenitic SS (304/304L, 316/316L/Ti, 321, 347, 310S, 904L, 6Mo), Duplex/Super-Duplex (2205/2507), Ferritic/Martensitic (430/444/410/420 for specific non-sanitary uses), Carbon/Alloy (E235/E355/20MnV6/42CrMo4/34CrNiMo6; A519 1020/1026/4130/4140), PH SS (17-4PH), Ni Alloys (Monel 400; 600/625; 800/825; C-22/C-276; Alloy 20; Ni200/201), Titanium (Gr.1/2/5/7/9).
Fitting compatibility: For 316/316L, keep ≤ 90 HRB (typ. 70–90) for double-ferrule bite.
4) Sizes & Tolerances
• Outside diameter: 0.30–60 mm (typical 1.0–25.4 mm; project-dependent extensions up to ~76 mm are possible).
• Wall thickness: 0.05–5.0 mm (commonly 0.1–2.0 mm).
• Length: Straight lengths 4–8 m; small diameters can be supplied as coiled tubing, single-coil length about 30–1500 m (size-dependent).
• Straightness: Typically ≤0.5 mm/m; high-precision ≤0.15–0.30 mm/m (confirm per project).
• Ovality and eccentricity: Recommended ovality ≤50% of the outside-diameter tolerance; wall-thickness eccentricity ≤10–12.5% (as agreed by project and standard).
• Internal surface roughness: Bright annealed (BA) typically Ra 0.4–0.8 μm; electropolished (EP) up to Ra ≤0.20–0.38 μm (e.g., when complying with ASME BPE SF4).
• Unified tolerance system: Prefer ISO 1127 with D3/D4 (diameter) + T3/T4/T5 (wall). For mechanical/hydraulic service, EN 10305 “precision/extra-precision” grades or engineering equivalents such as h9/h10 may be specified. It is also acceptable to adopt the applicable tolerance clauses of ASTM A269, ASTM A213, or ASTM A789 per the product standard, provided the adopted standard and grade are explicitly stated in the purchase documents.
5) Manufacturing Routes
SMLS: pierced shell → multi-pass cold draw/roll → sizing → HT (solution/anneal/tempering/stress-relief) → straightening → finishing.
W&D: strip forming + TIG/laser/PAW → weld bead conditioning/cold-work → solution/BA (H₂/N₂) → straightening → finishing.
Surface & passivation ASTM A380/A967; options AP/BA/EP, degreasing, low-residue cleaning.
Coils: continuous anneal + 100% inline ET, tension control, spooling.
6) KPIs & Application Mapping
Tightness tiers: industrial He ≤ 1×10⁻⁶ mbar·L/s; UHP ≤ 1×10⁻⁹; medical/vacuum per OEM.
Cleanliness: automotive ISO 16232; UHP NVR + particle counts per customer/IEST/ISO 14644; sanitary per A270/BPE.
Mechanicals: YS/UTS/El; hardness window; PH/duplex per temper/phase balance.
Corrosion: A262 (IGC), A923 & G48 for duplex (optional).
Geometry: OD/WT/ID tolerances, straightness, eccentricity, deburred/chamfered ends.
Mapping
• Instrumentation & control (O&G/chem/offshore): A269 316L, 1/4–1” × 0.035–0.083”; seawater/high-Cl⁻ → A789/A269 2205/2507; consider NACE compliance.
• Sanitary/pharma: A270 316L + BPE, SF1/SF4, EP/BA, double-bag.
• Semiconductor/UHP: 316L BA/EP (controlled S, δ-ferrite, inclusions), He 1×10⁻⁹, NVR/particles, double-bag with inert purge.
• Hydraulic/Pneumatic: EN 10305-4 E235/E355 (NBK/GBK) or A519 1020/1026/4130/4140; deburred ends; cleanliness limits.
• EV/Auto thermal & fluids: EN 10305-1/-4 or A269 304/316L with ISO 16232.
• Compact HX/steam-condensate: A213 304/316/321/347 or B338 Ti Gr.2/9.
• Medical needles: ISO 9626 / ASTM A908.
7) QA/QC
Chemistry OES/ICP + PMI (100% for critical services).
Mechanicals & hardness (316/316L ≤90 HRB).
NDT: ET per EN ISO 10893-2 or ASTM E426/E309 (coils 100% ET); UT per EN ISO 10893-10/12 or ASTM E213.
Pressure/air-tightness; helium leak to tier.
Geometry & surface (OD/WT/ID; straightness; Ra for BA/EP).
Corrosion options A262/A923/G48.
Docs: EN 10204 3.1/3.2, HT charts, NDT/pressure/leak, cleanliness/roughness, TPI if required.
8) Delivery & Packaging
Straight tubes with plastic caps / coils on plastic or steel reels.
Clean levels: oiled / degreased / UHP double-bagged with inert purge.
Traceability labels (grade/size/heat/batch/date/inspection state/clean level).
Anti-scuffing, end-protection, coil tie-downs.
9) RFQ/PO Checklist
1. Standard + grade (e.g., ASTM A269 316L / EN 10305-4 E355 / ASTM A789 S32205 / ASTM B338 Ti Gr.2)
2. Size: OD × WT × L (or OD × ID × L); coil length per reel
3. Tolerances & geometry: ISO 1127 D?/T? or explicit ±; straightness, ovality/ecc.; end deburr/chamfer
4. Condition: BA/AP/EP; stress-relieved; hardness window (e.g., 316L ≤90 HRB)
5. NDT & pressure/leak: ET/UT level; hydro/pneumatic; He leak class
6. Surface & cleanliness: BA/EP, BPE SF1/SF4, ISO 16232 or UHP NVR/particles
7. Docs/TPI: EN 10204 3.1/3.2, PMI, NDT/pressure/He, Ra/cleanliness; third-party if needed
8. Service data: medium/temperature/pressure/environment (seawater, H₂S, vacuum, O₂ service)
9. System fit: ferrule brand compatibility (hardness/OD tol), bending radius / forming requirements
10) Material Selection Guide
Seawater/high-Cl⁻: 2205/2507/6Mo; verify A923/G48.
Sanitary/pharma: 316L + A270/BPE, SF1/SF4, EP/BA, double-bag.
UHP/semiconductor: 316L BA/EP, controlled S/δ-ferrite/inclusions, He 1×10⁻⁹, NVR/particles.
Hydraulic/pneumatic: EN 10305-4 E235/E355 (NBK/GBK); deburred ends.
High-temp: 321/347/310S.
Strong corrosion/mixed acids: C-276/625/825/904L/254SMo.
Lightweight/non-magnetic: Ti Gr.2/9.
11) Risk Checklist
Using EN 10305 mechanical tubes for pressure without A1016/A269 compliance;
Missing surface/cleanliness/He leak definitions for sanitary/UHP;
No hardness/OD tolerance control for ferrule fittings;
Quoting A269 without flattening/flaring/reverse-bend/hardness/NDT plan;
Medical microtubes not to ISO 9626/A908;
Duplex without A923/G48 / phase-balance checks;
Imperial-metric fit errors; coils without inline ET; unsealed/unclean ends;
UHP without NVR/particle reports.
12) Sample Spec Lines (English)
• Instrumentation (O&G/Chem)
“Tube, ASTM A269 TP316L, 1/2” × 0.083’’, BA, OD tol ±0.05 mm, HRB ≤90, ET 100%, Hydro per A269, PMI 100%, EN 10204 3.1; ends deburred & chamfered.”
• Seawater/High-Cl⁻
“Tube, ASTM A789 UNS S32205, 12 mm × 1.5 mm, AP, ISO 1127 D4/T3, ET 100%, ASTM G48 Method A @ 25 °C pass, ASTM A923 Method A pass, 3.1.”
• Sanitary/Pharma
“Tube, ASTM A270 316L, 25.4 × 1.65 mm, ASME BPE SF4 (EP), ID Ra ≤ 0.38 µm, He ≤ 1×10⁻⁶ mbar·L/s, double-bag, 3.1 with Ra & cleanliness reports.”
• Semiconductor UHP
“Tube, 316L BA/EP (ASTM A269), 12.7 × 1.65 mm, S-controlled, δ-ferrite controlled, ID Ra ≤ 0.25 µm (project), He ≤ 1×10⁻⁹ mbar·L/s, NVR/particles per spec, double-bag + N₂ purge, 3.1.”
• Hydraulic/Pneumatic
“Tube, EN 10305-4 E355 +N, 10 × 1.5 mm, OD tol ±0.05 mm, Straightness ≤ 0.5 mm/m, ET per EN ISO 10893-2, Cleanliness per ISO 16232, 3.1.”
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