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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
Bridge Steel
Bridge Steel
Bridge Steel (Plates / Sections / Pipe Piles / Cable Steel)｜Global Sourcing for Engineering & Procurement
1. Product Positioning & Applications
For long-span sea/river crossings and mountainous highway or railway bridges, covering steel box girders, trusses, pylons, orthotropic steel decks (OSD), cross-beams and diaphragms, steel pipe piles and pile groups, stay cables and anchorage components. Objectives: strength and toughness, fatigue and fracture control, 100-year durability in coastal applications, and manufacturability (thick-plate welding, through-thickness properties, coherent protection systems).
2. Standards Matrix (by system)
China: GB/T 714 (bridge structural steels Q345q–Q550q with impact classes D/E/F), GB/T 5313 (through-thickness properties Z15/Z25/Z35), GB/T 4171 (weathering steels), JTG D64 (highway steel bridge design), GB 50661 (steel welding; often coordinated with AWS D1.5).
United States: AASHTO M270 / ASTM A709 (Gr.50/50W/HPS50W/HPS70W), AWS D1.5 (bridge welding; FCM fracture control), AASHTO LRFD Bridge Design, ASTM A578 (UT for plates), ASTM A770 (through-thickness tension).
Europe: EN 10025-2/-3/-4 (S355/S420/N/M series), EN 10025-5 (weathering), EN 10164 (Z-direction), EN 10160 (UT for plates), EN 10210/EN 10219 (structural hollow sections).
Protection & metallizing: ISO 12944 (C1–CX environments and durability), ISO 2063 (Zn/Al thermal spray), ISO 1461 (hot-dip galvanizing).
3. Scenario–Material–Standard–Size Mapping (quick guide)
Sea-crossing bridges (C5-M/CX, 100-year life): main members in Q420qE/F or Q460qE/F (specify Z25/Z35 and plate UT level), or A709 HPS50W/HPS70W; pipe piles in ASTM A252 Gr.3 (OD ≈ 2000–3000 mm, WT 40–100 mm); stay cables ≥1860 MPa or galvanized parallel wires.
Urban expressways & rail bridges (hot/humid or cold regions): Q345qD/E, Q370qE or EN S355J2/S420M/ML; in cold climates choose E/F or ML grades; specify Z-direction and UT for thick joints.
Weathering aesthetic bridges (non-severe marine): EN 10025-5 S355J2W/S355K2W or GB/T 4171 (e.g., Q355NH) with an explicit coating or metallizing system—do not rely on self-patina in C5-M/CX marine zones.
Steel pipe piles & temporary works: SAW/LSAW large-diameter piles; OD ≈ 1000–3000 mm, WT 25–100 mm; machining bevels per WPS/PQR.
OSD deck systems: deck plate thickness typically ≥16 mm (16–19 mm common; 20 mm for heavy-duty/fatigue-sensitive); rib height ~200–350 mm, rib thickness 6–11 mm, rib spacing ~600 mm (project-specific).
4. Size Range & Tolerances (engineering window)
Plates: thickness 12–120 mm typical (anchor/footing may exceed 120 mm); width ≤ 4200 mm; length ≤ 18 m; plate UT by ASTM A578 Level B/C or EN 10160 S2/E2.
Sections & hollow sections: rolled H200–H900; larger sections from built-up box/plate girders; tolerances per EN 10210/EN 10219.
Steel pipe piles: OD ≈ 1000–3000 mm, WT 25–100 mm (SAW/LSAW), bevels per WPS/PQR.
Plate tolerances: EN 10029 or ASTM A6; welded component geometry per project drawings and execution standards.
5. Manufacturing & Key Controls
Base material: TMCP and Q&T routes; center soundness and segregation controlled; specify Z-direction properties (EN 10164) and ASTM A770 through-thickness tension where applicable.
Welding & fracture control: for FCMs, adopt AWS D1.5 fracture-control requirements and CTOD/low-temperature toughness in the ITP; define interpass temperature, heat input and repair criteria for medium/thick butt welds.
Protection & metallizing: select per ISO 12944; for marine bridges, prefer TSA (thermal-sprayed Al/Zn) plus organic topcoats, or hot-dip galvanizing for secondary members.
6. QA/QC & Documentation
CMTRs per EN 10204 3.1/3.2. NDT: plate UT per EN 10160 or ASTM A578; Z-direction and through-thickness tests per EN 10164/ASTM A770; welding quality per AWS D1.5 and project ITP.
Standards alignment: map GB/T 714, EN 10025, or AASHTO M270/ASTM A709 one-to-one and state revisions; apply special clauses and type-testing for weathering steels and cable systems.
7. Supply Forms & Packing
Supply as mill plates, cut parts, pre-assemblies, finished pipe piles (with bevels), and blasted/primed components. Blast to Sa 2.5, apply shop primer per system, use soft interleaving and corner protection, and trace with sprayed IDs and barcodes.
8. Ordering Checklist (ready to copy)
Standards & revisions: e.g., “GB/T 714-2023 Q420qE” or ““ASTM A709 HPS50W (state revision)”
Performance & tests: impact temperature and energy, Z-direction level (Z25/Z35), plate UT level (EN 10160 S2/E2 or ASTM A578 B/C), CTOD/FCM where applicable.
Dimensions & tolerances: thickness × width × length; plate tolerances per EN 10029 or ASTM A6; for piles specify OD × WT × length and bevel details.
Protection: ISO 12944 category and target durability; metallizing or coating system with DFT, adhesion and holiday testing.
Docs & witness: EN 10204 3.1/3.2, WPS/PQR, NDE reports, third-party witness plan.
9. Selection Guide
Sea-crossing main spans: A709 HPS70W/HPS50W, or Q460qE/F with Z25/Z35.
Urban/rail bridges: Q345qD/E, Q370qE, or EN S355J2/S420M/ML.
Weathering aesthetics: EN 10025-5 or GB/T 4171 with robust protection in marine zones.
Large pipe piles: ASTM A252 Gr.3 (OD 1000–3000 mm, WT 25–100 mm) with project-specific welding and protection clauses.
10. Procurement/Construction/O&M Risk Alerts
Weathering limits: do not rely solely on patina in C5-M/CX marine environments—use heavy-duty coatings or metallizing.
Z-direction & UT: missing Z-direction and UT on thick joints risks lamellar tearing and hidden defects.
Welding fracture control: FCMs must follow AWS D1.5 with CTOD/toughness clauses.
Pipe pile tolerances: define OD/WT/ovality and bevel tolerances explicitly in the PO.
11. Representative Spec Lines (paste-ready)
“Plate: ASTM A709 HPS70W, 60 mm × 3000 mm × 12 m; UT per ASTM A578 Level C; through-thickness per ASTM A770; EN 10204 3.2; blasted Sa 2.5 + primer 75 μm.”
“Plate: GB/T 714-Q420qE, Z25; 40 mm × 3500 mm × 13 m; UT EN 10160 S2/E2; Charpy −40 °C ≥ 34 J; EN 10204 3.1.”
“Steel pipe pile: LSAW, ASTM A252 Gr.3, OD 2000 mm × WT 50 mm × L 24 m; bevel per drawing; ME + full-length UT; external protection per ISO 12944 C5-M with DFT & holiday reports.”
“OSD deck: EN 10025-4 S420ML, deck plate 20 mm; ribs 8 mm; UT EN 10160 S2/E2; Z25; welding ITP to AWS D1.5 FCM.”
12. Global Representative Producers (examples; alphabetical, for vendor shortlisting only)
ArcelorMittal (incl. Industeel/NA plate), Baowu, Cleveland-Cliffs, Dillinger, HBIS, JFE Steel, Nippon Steel, NLMK Clabecq, POSCO, SSAB, Thyssenkrupp, voestalpine, Wuyang. Capabilities (sizes, TMCP/Q&T, UT/Z, certifications) vary—verify against current datasheets and approvals.
Bridge Steel (Plates / Sections / Pipe Piles / Cable Steel) ｜Technical Specifications
A. Key Corrections & Boundary Clarifications
1. Chinese standard & impact classes. Bridge structural steels shall follow GB/T 714 “Structural steels for bridge” (grades Q345q–Q550q). Impact classes D/E/F correspond to −20/−40/−60 °C respectively. For thick plate, the design shall specify both test temperature and required absorbed energy.
2. Through-thickness (Z-direction) properties. When resistance to lamellar tearing is required, specify GB/T 5313 (Z15/Z25/Z35) in China; EN 10164 (Z15/Z25/Z35) in Europe. For U.S. projects, ASTM A770/A770M may be used for through-thickness tensile testing.
3. Pipe pile standards. Foundation piles shall prefer ASTM A252 or EN 10219/EN 10210. Do not use API 5L as the sole specification for piles unless structural mechanics, dimensional tolerances, NDE, and welding provisions are explicitly added.
4. OSD deck plate thickness. Orthotropic steel deck (OSD) top plates should be ≥ 16 mm; heavy-duty or fatigue-sensitive areas commonly adopt 16–20 mm. Rib thickness, height, and spacing shall be set by the project’s fatigue detail category design.
5. Weathering steels—use boundary. In marine C5-M/CX salt-spray zones, heavy-duty coatings or thermal-spray metallizing are still required; natural patina alone is insufficient.
6. Cable systems. Stay cables commonly use 1860 MPa low-relaxation strands (15.2/15.7 mm). Suspension main cables are galvanized high-strength parallel wires per project technical conditions; type testing and full-scale bundle fatigue are required. Anchor boxes/plates are often 60–120 mm thick and shall comply with FCM (fracture-critical member) control.
B. Scope & Overall Performance Objectives
Scope. Steel box girders, trusses, towers/pylons, cross-beams and diaphragms, pipe piles/pile groups, cable systems and anchor components for sea-crossing, river-crossing, and mountainous highway and railway bridges.
Objectives.
— Strength & toughness: meet specified YS/UTS and low-temperature impact class (D/E/F).
— Fatigue & fracture control: FCM members per AWS D1.5 Clause 12.
— Durability & protection: 100-year design life is common for sea bridges.
— Manufacturability: thick-plate welding/dissimilar welds, Z-direction lamellar tearing resistance, and consistent heavy-duty coating/metallizing systems.
C. Standards Matrix (China / U.S. / EU / Japan—commonly used)
1. China
— GB/T 714 (bridge structural steels Q345q–Q550q, impact classes D/E/F)
— GB/T 5313 (Z-direction properties Z15/Z25/Z35)
— GB/T 4171 (weathering steels)
— JTG D64-2015 (Specifications for Design of Highway Steel Bridge)
— GB 50661 (Welding code for steel structures; may be coordinated with AWS D1.5 in projects)
2. United States
— AASHTO M270 / ASTM A709 (Gr.50/50W/HPS 50W/HPS 70W)
— AWS D1.5 (Bridge Welding Code, incl. FCM fracture control)
— AASHTO LRFD Bridge Design Specifications
— ASTM A578/A578M (UT of rolled plates); ASTM A770/A770M (through-thickness tension tests)
3. Europe
— EN 10025-2/-3/-4 (S355/S420 N/M series), EN 10025-5 (weathering steels)
— EN 10164 (Z-direction properties); EN 10160 (UT of plates)
— EN 10210 / EN 10219 (structural hollow sections)
4. Corrosion protection & metallizing
— ISO 12944 (environment classes C1–CX, durability H/VH, system qualification)
— ISO 2063-1/-2 (thermal-spray Zn/Al—design & application)
— ISO 1461 (hot-dip galvanizing)
5. Cables & prestressing
— GB/T 5224 / ASTM A416 / EN 10138 (prestressing strands)
— Suspension cable wires per project technical specs, or ASTM A586/A603 family as applicable.
D. Material Systems & Typical Uses (text)
1. Plates & sections (primary structure)
— China: Q345qD/E, Q370qD/E, Q420qE/F, Q460qE/F; specify Z25/Z35 and UT level where needed.
— U.S.: A709 Gr.50/50W/HPS 50W/HPS 70W (HPS offers superior weldability/toughness; often selected for sea bridges).
— EU: S355J2, S420M/ML, S460M/ML; weathering: EN 10025-5 S355J2W/S355K2W.
Applications: steel box girders, towers/pylons, stiffeners, diaphragms and node plates, OSD deck plates.
2. Steel pipes & pipe piles (foundations/piers/temporary works)
— ASTM A252 Gr.2/Gr.3 (piles) or EN 10219/EN 10210 (structural hollow sections).
— Dimensional capability: OD 1000–3000 mm, WT 25–100 mm (SAW/LSAW).
3. Cable steels & anchorage components
— Stay cables: 1860 MPa low-relaxation strands (15.2/15.7 mm), HDPE sheathing with wax/ grout filling.
— Suspension main cables: galvanized high-carbon parallel wires 1570–1860 MPa (type tests per project).
— Anchor boxes/bearings: thick plate 60–120 mm, materials matched to adjacent members, managed as FCM.
4. Weathering steels & protection materials
— GB/T 4171 (e.g., Q355NH), EN 10025-5 (e.g., S355J2W). In marine settings, heavy-duty coatings or TSA composite systems are still required.
E. Dimensions, Tolerances & Manufacturing Capability (engineering windows)
— Plates: typical 12–120 mm (anchor/footing plates in sea bridges may exceed 120 mm); widths ≤ 4200 mm, lengths ≤ 18 m (mill-dependent). Thick-plate UT per ASTM A578 Level B/C or EN 10160 S2/E2.
— OSD decks: top plate ≥ 16 mm (commonly 16–19 mm, up to 20 mm in heavy/fatigue-sensitive areas); rib height ~200–350 mm, rib thickness 6–11 mm, rib spacing ~600 mm (optimize by project).
— H-sections: rolled H200–H900; larger sections are typically built-up box/compound sections from plates.
— Pipe piles: OD 1000–3000 mm, WT 25–100 mm; manufactured by SAW/LSAW; end bevels per WPS.
— Tolerances: plates per EN 10029 or ASTM A6; hollow sections per EN 10210/10219; fabricated geometry per project drawings and governing standards.
F. Service → Material/Standard → Protection System (quick mapping)
1. Sea-crossing bridges (C5-M/CX, 100-year target)
— Primary: Q420qE/F or Q460qE/F (Z25/Z35 + thick-plate UT), or A709 HPS 50W/70W.
— Piles: ASTM A252 Gr.3 (e.g., OD 2000–3000 mm, WT 40–100 mm).
— Cables: 1860 MPa stays/wires; bundle fatigue and relaxation per project.
— Protection: TSA (Al/Zn) 200–250 µm + sealer, or Zn-rich epoxy + high-solids epoxy + polyurethane with total DFT ≥ 320–380 µm; splash/ spray zones with enhanced measures.
— Welding & FCM: AWS D1.5 Clause 12, hydrogen control, Z-direction lamellar-tearing mitigation.
2. River-crossing bridges (C4–C5-I, 50–100 years)
— Primary: Q345qD/E, Q370qD/E, Q420qE or A709 Gr.50/50W; specify Z-properties at critical nodes.
— Piles: A252 / EN 10219.
— Protection: three-coat system with total DFT ≥ 300 µm; add TSA locally at joints/anchor zones as needed.
3. Mountain bridges (C3–C4, low temperature/wind/seismic)
— Primary: Q420qE / Q460qE; in non-marine atmospheres, Q355NH or EN 10025-5 weathering steels may be used.
— Protection: weathering steel exposed with sealed joints/laps, or conventional three-coat systems for C3/C4.
G. Manufacturing & Welding Essentials
— Plate metallurgy & making: TMCP, normalized/normalized-rolled; clean steel and fine grain practice. Put UT and Z-properties into purchase orders for thick plates.
— Welding standardization: adopt AWS D1.5 (or coordinate with national codes); list FCM members, apply tightened material and NDE controls; WPS/PQR shall be witnessed.
— Low-temperature & fracture: specify CVN temperature/energy; where necessary require CTOD/K_Ic and sampling locations. At three-plate intersections/high triaxiality zones, strictly control heat input and diffusible hydrogen; apply bake-out/ dehydrogenation heat treatment if required.
— Geometry & residual stress: control OSD weld toe/root quality at fatigue-sensitive details; ensure access for inner box welds and defined repair windows.
H. Corrosion Protection / Metallizing Systems (acceptance per ISO 12944 / 2063)
— System A (C5-I/H or C5-M/H): Zn-rich epoxy ~80 µm + high-solids epoxy ~160 µm + polyurethane 60–80 µm, total DFT ≥ 300–320 µm.
— System B (CX/VH, sea bridges): TSA (Al or Zn) 200–250 µm + sealer; topcoats may be added in critical areas.
— System C (weathering steel): rely on stable patina for exposed members; seal joints/laps.
— Surface preparation: abrasive blast Sa 2½ (ISO 8501-1); match surface profile/cleanliness to system; TSA strictly per ISO 2063-1/-2.
— Hot-dip galvanizing: small components may follow ISO 1461; large primary members typically adopt paint/TSA or duplex systems.
I. Quality Assurance & Inspection (ITP backbone)
— MTC: EN 10204 3.1/3.2 certificates listing chemistry, mechanicals, CVN, Z-properties, and UT class.
— NDE: plate UT per ASTM A578 or EN 10160; butt welds UT/RT, fillet/angle welds MT/UT; FCM inspection quantities as per AWS D1.5.
— Fatigue details: OSD weld toe/root are sensitive—control detail category and geometry per AASHTO/FHWA guidance.
— Coating acceptance: DFT, adhesion, porosity/holiday, and durability per ISO 12944; TSA thickness/adhesion/porosity per ISO 2063.
J. Ordering (Procurement) Essentials (copy-ready)
1. Standard & grade: e.g., “GB/T 714 Q460qE Z25, delivery TMCP/normalized (state)”; or “AASHTO M270 HPS 70W”.
2. Dimensions & tolerances: t/width/length; for t > 50 mm specify Z25/Z35 and thick-plate UT (ASTM A578 Level B/C); include section/box geometry tolerances.
3. Performance: CVN temperature & energy (e.g., −40 °C ≥ 34 J); CTOD/K_Ic and sampling locations if required.
4. Welding: AWS D1.5 execution; submit WPS/PQR, welding consumables’ diffusible hydrogen class; list FCM and fracture control plan requirements.
5. Protection: environment class (C5-M/CX), target durability (H/VH), system build-up and total DFT; if TSA (Al) 200–250 µm, state sealer material.
6. Pipe piles / hollow sections: ASTM A252 Gr.3 or EN 10219 S355J2H/S420MH; manufacturing (LSAW/SAW), NDE, and dimensional tolerances.
7. Cables / anchorage: 1860 MPa strands (GB/T 5224 / ASTM A416 / EN 10138), sheathing/filling, bundle fatigue, relaxation, anchorages & corrosion details.
8. Documentation: MTC 3.1/3.2, NDE reports, coating/TSA QA records, third-party inspection plan (TPI).
K. Construction Quality & Risk Checklist
— Mixing pile vs. pipeline standards. Structural piles shall be A252 / EN 10219/10210; do not substitute with API 5L alone.
— Thick-plate brittle fracture/lamellar tearing. Missing Z25/Z35 and UT class invites risk; three-plate intersections and T-joints demand tight heat-input and hydrogen control.
— OSD plates too thin. < 16 mm promotes fatigue cracking; detail category and weld toe geometry must be controlled.
— Bare weathering steel in marine zones. In C5-M/CX do not rely on patina alone—use heavy-duty coating or TSA.
— FCM process gaps. If FCM tracking and tightened NDE are absent, compliance fails—execute AWS D1.5 Clause 12 rigorously.
— Inadequate surface prep for TSA/paint. Less than Sa 2½ or mismatched roughness leads to early detachment.
L. Sample Spec Lines (paste into RFQ/PO)
1. Sea-bridge box-girder plate:
“Plate, GB/T 714 Q460qE, t = 50 mm × 3000 mm × 12000 mm, Z25, UT per ASTM A578 Level C, CVN −40 °C ≥ 34 J (location per spec), delivery TMCP/normalized (state), MTC EN 10204 3.2, FCM applicable.”
2. Steel pipe pile:
“Steel Pipe Pile, ASTM A252 Gr.3, OD 2500 mm × WT 80 mm × L 36 m, SAW (long seam), tolerances per A252, 100% UT on seams, end bevel per WPS, MTC 3.1, pile shoes & internal stiffeners per drawing.”
3. Stay cable (full bundle):
“Stay Cable, 1860 MPa low-relaxation strands 15.7 mm, HDPE sheathing with wax filling, fatigue ≥ 2×10⁶ cycles per project spec, full-scale anchor test included, accessories & deviators per system supplier manual.”
4. Sea-bridge coating system:
“Coating, TSA (Al 85/15) 220 µm + sealer; surface prep Sa 2½; ISO 2063-1/-2 compliant; adhesion & porosity tests per ITP; splash/tidal zones with additional stripe coats as specified.”
M. Representative Global Suppliers & Industry Footprint
(illustrative, alphabetical; not an endorsement—project-specific qualification required)
Heavy/bridge plates (incl. HPS / high-strength / weathering):
ArcelorMittal (EU/NA), Baowu (China), Dillinger (DE), HBIS Group – Wuyang (CN), JFE Steel (JP), Nippon Steel (JP), POSCO (KR), SSAB (SE/FI/AM), voestalpine Grobblech (AT), Ansteel (CN), Shougang (CN), Valin Xiangtan (CN).
Large-diameter piles/structural pipe:
JFE Steel, Nippon Steel, POSCO, EUROPIPE, Corinth Pipeworks, ArcelorMittal Tubular; in China, Baowu/Ansteel/TPCO with LSAW/SAW capacity (subject to audit).
Cable wires/strands & system integrators:
Bridon-Bekaert, Fatzer, Redaelli, Kiswire, Usha Martin; systems & anchorages often Freyssinet, VSL, DYWIDAG; China: Shanghai-based suppliers (e.g., Pujiang group companies) subject to type tests and approvals.
Metallizing/Coating contractors:
Regional specialist applicators partnering with coating/metallizing OEMs; pre-qualify to ISO 12944/2063 and owner whitelists.
Note: The above are representative long-serving bridge suppliers. Final selection must reflect current qualifications, standard editions, type-test scope, and client approvals.
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