50t European Standard Double-Girder Crane for Steel Mill
In Q3 2025, Kelude delivered two 50t × 28m European Standard Double-Girder Bridge Cranes to EUROTECH STEEL's electric arc furnace (EAF) steel plant in Vietnam. The project was executed under a full turnkey model (design + manufacturing + CE Certification + sea freight + on-site installation + commissioning + TSG acceptance), with a lead time of just 14 weeks (3 months) from contract signing to commissioning. The cranes comply with EN 13001 Crane Safety Standard, with a FEM 2m work duty classification. Designed to ISO 4301 (in lieu of GB/T 14405), the main structure uses S355J2+N steel with a C4-M coating system (ISO 12944), Siemens S7-1500 PLC Control, and SEW-Eurodrive gearboxes. CE Certification under MD 2006/42/EC was passed on the first attempt, and TSG acceptance was completed with zero rectification items. The customer placed an additional order for two more units of the same model in 2026.
Southeast Asia's steel production capacity is expanding rapidly—crude steel output across the six ASEAN nations grew 12% year-on-year in 2025, with Vietnam leading the pack at +18%. EAF steelmaking relies heavily on overhead cranes for every stage of the process: scrap basket handling, ladle transport, and billet transfer to the finished goods yard. The two 50t European Standard Double-Girder Cranes supplied to EUROTECH STEEL handle billet lifting in the continuous casting bay and finished product stacking in the yard, making them critical assets in the production line.
Customer Requirements: 3-Month Delivery and CE Certification as Hard Gate Criteria
During the bidding phase, EUROTECH STEEL set two non-negotiable requirements: a delivery time of no more than 16 weeks (from contract signing to on-site lifting readiness), and mandatory CE Certification (MD 2006/42/EC)—since the project is EPC-managed by a European engineering firm, all equipment must comply with EU standards. These two conditions immediately eliminated suppliers lacking export credentials and production flexibility.
Kelude's competitive edge rested on three pillars:
① Existing EC type-examination certificate—the 50t European Standard Double-Girder model already held an EC type-examination certificate covering this capacity range, eliminating the need for re-certification and saving 4–6 weeks of approval time;
② Standardized drawing templates—CE-certified structural drawings for the 50t × 28m span × 8m lifting height configuration were already available, requiring only minor adjustments rather than a from-scratch design;
③ Streamlined manufacturing schedule—main girder welding, machining, and electrical assembly ran in parallel rather than sequentially.
The final delivery time was 14 weeks—two weeks ahead of the customer's 16-week requirement.
Solution Configuration: Standard European Double-Girder with Tropical Climate Adaptations
Core crane parameters (designed to ISO 4301, in lieu of GB/T 14405): Rated Lifting Capacity 50t (main hook) + 10t (auxiliary hook), span 28m, lifting height 8m above rail / 10m below rail, work duty FEM 2m (equivalent to ISO 4301 classification), Long Travel Speed 40/10 m/min (VFD-controlled), Cross Travel Speed 20/5 m/min (VFD-controlled), main hoist lifting speed 5/0.8 m/min (VFD-controlled), auxiliary hoist lifting speed 8/1.2 m/min (VFD-controlled).
Three adaptive modifications were made for Vietnam's tropical climate (average annual temperature 28°C, humidity >80%):
① Electrical cabinet moisture-proofing and cooling—cooling fan power increased by 30%, with a humidity controller and anti-condensation heater installed inside the cabinet to prevent condensation on electronic components at 85% humidity;
② Upgraded coating system—upgraded from standard C3 to C4-M (ISO 12944), featuring 80μm epoxy zinc-rich primer + 150μm epoxy micaceous iron oxide intermediate coat + 50μm polyurethane topcoat, with a design anti-corrosion service life of ≥15 years;
③ Upgraded fastener materials—all exposed fasteners (bolts/nuts/washers) replaced with AISI-316 stainless steel to prevent electrochemical corrosion in high-humidity environments.
| Parameter Item | technical specifications | Brand/Model | Remarks |
|---|---|---|---|
| Main hoist | 50t · 5/0.8 m/min | SEW-Eurodrive KSeries Reducer / Gearbox | FEM (Fédération Européenne de la Manutention) 2m · Dual Brake |
| auxiliary hoist | 10t · 8/1.2 m/min | SEW-Eurodrive KSeries Reducer / Gearbox | FEM (Fédération Européenne de la Manutention) 2m · Single Braking |
| Long Travel / Bridge Travel | 40/10 m/min · 4Wheel2Drive | SEW-Eurodrive RSeries Reducer / Gearbox | Variable Frequency Drive (VFD)·Photoelectric Anti-collision |
| Cross Travel / Trolley Travel | 20/5 m/min · 4Wheel2Drive | SEW-Eurodrive RSeries Reducer / Gearbox | Variable Frequency Drive (VFD)·Laser Anti-collision |
| Main Structure | S355J2+N · C4-MCoating / painting | Wuyang Steel/Baosteel | EN 10025 Hot rolled structural steel standard Certification |
| electrical control | Siemens S7-1500 PLC | Siemens | CE·UL·PROFIBUS |
| Power Supply | Enclosed conductor electrification (ECE) 200A | Vahle VAHLE | IP23·Tropical Adaptation |
| safety devices | Lifting Capacity Limiter / Load Limiter+Dual Limit Switch | Changzhou Changxin | CE·TSG (Special Equipment Safety Technical Regulation)Dual Certification |
14-Week Delivery Timeline: Key Milestones
Weeks 1–2 (Design & Approval): Based on the standard 50t × 28m drawings, we adjusted the crane span tolerance and end carriage connection dimensions to match the customer's embedded part layout provided for their factory building. Simultaneously, the CE technical file — including the design calculation report, risk assessment, and electrical schematic — was submitted to TÜV Rheinland for review. Leveraging the existing EC type-examination certificate, we used the streamlined approval path, cutting the review period to 10 working days (versus the standard 4 weeks).
Weeks 3–8 (Fabrication): Main girder welding was carried out in our main workshop using S355J2+N steel plate with CO₂ Gas-Shielded Welding and 100% UT flaw detection. End carriages and the trolley frame were fabricated in parallel in the auxiliary workshop. Throughout production, the customer's appointed SGS inspector conducted weekly inspections and issued reports, with sign-off required at key hold points: main girder tack-up, welding completion, and surface treatment before coating. By the end of Week 8, pre-assembly and electrical commissioning were completed in-house.
Weeks 9–10 (In-House Testing): Testing included a 100% rated load test (50t) and a 125% static load test (62.5t). Measured mid-span deflection under load was 18.2mm — well within the allowable limit of 28mm (S/1000). A 110% dynamic load test (55t) verified smooth crane bridge and trolley travel. The EC type-examination inspector witnessed the tests on-site and signed off on the results.
Weeks 11–14 (Sea Freight & On-Site Installation): The crane was disassembled into 3 transport units (2 main girder sections + one combined end carriage/trolley assembly) and shipped in a 40ft open-top container to Haiphong Port, Vietnam (7-day transit), followed by 1 day of overland transport to the site. The 5-person installation crew completed the job in 12 days: rail re-survey, end carriage installation, main girder hoisting, electrical wiring, commissioning, and TSG acceptance inspection. All 36 TSG inspection items passed with zero rectification required.
Customer Feedback & Repeat Order
EUROTECH STEEL's Project Manager noted in the Acceptance Report that the crane exceeded expectations on three fronts: completeness of the design documentation (zero major non-conformities in the TÜV Rheinland review), weld seam quality (meeting EN ISO 5817 Level B), and on-site installation precision (crane span deviation within ±3mm). In Q1 2026, the customer's Phase II electric arc furnace project included a repeat order for 2 identical 50t × 28m European Standard Double-Girder cranes, with the same 14-week delivery requirement.
Both Phase II cranes completed in-house testing in June 2026 and were shipped in July. Manufacturing cost for the repeat order came in roughly 8% lower than the first — the design drawings and tooling were reused directly, and the production team was already familiar with the process, resulting in noticeably higher fabrication efficiency.
FAQ
Q: Is a 3-month delivery for a 50t European Standard Double-Girder crane the norm or the exception?
A: For a standard configuration (50t × 28m span × 8m lifting height, FEM 2m duty, standard coating), a 3–4 month lead time is consistently achievable — provided three conditions are met: ① a CE-certified template drawing already exists (no design from scratch), ② main structural steel is in stock or available through a mill agreement, and ③ the workshop has production capacity available. For non-standard configurations (special spans, extra-high lifting heights, explosion-proof or metallurgical designs), expect 5–6 months. The 14-week delivery was the exception, not the rule — two weeks faster than our standard cycle, made possible by the customer's rapid approval turnaround and a tightly packed production schedule.
Q: What are the main differences between Southeast Asian and domestic projects?
A: Three key differences stand out. First, CE certification requirements — not required domestically, but mandatory for many Southeast Asian projects where European EPC contractors are involved. Second, anti-corrosion standards: the high-humidity, salt-laden environment in Southeast Asia typically demands C4-M or higher coating (domestic projects can get by with C3), adding roughly 20% to the coating cost. Third, sea freight packing — disassembled transport units must fit within container dimensions (a 40ft open-top container measures 11.8 × 2.3 × 2.3m internally), so main girder section lengths and heights cannot exceed these limits. Where necessary, we design in-house splice solutions or use open-top/flat-rack containers, which increases freight costs by 30–50%.
Q: What characteristics do projects with high repeat-order rates share?
A: Projects that generate repeat business typically share three traits: ① the customer is in a capacity expansion phase (e.g., a Southeast Asian steel mill building Phase II and III in succession); ② the crane is critical production equipment — not auxiliary — where downtime halts the entire line, making quality a higher priority than price; and ③ the first order was delivered without major issues (particularly in design documentation quality and CE certification approval), building trust in our ability to deliver.
Q: How were taxes and import duties handled for the Vietnam project?
A: The cranes were exported under a standard FOB or CIF Incoterms arrangement, with import duties and VAT handled by the customer's customs broker in Vietnam. As the equipment qualified under the ASEAN-China Free Trade Area (ACFTA) agreement with a Certificate of Origin (Form E), the import duty was reduced to 0% for crane machinery classified under HS code 8426. The customer's broker managed the full customs clearance process, and we provided all necessary technical documentation (CE certificates, drawings, and packing lists) to support the declaration. No issues were encountered during clearance at Haiphong Port.
A: Vietnam's import tariff policy for cranes: the import duty on fully assembled units is 0% (under the China–ASEAN FTA preferential rate within the AFTA framework), with a 10% VAT (deductible against future input tax). Sea freight costs approximately $8,000–$12,000 per 40ft container (Shanghai–Haiphong route), plus $2,000–$3,000 for inland haulage and port handling. On-site installation is carried out by a Kelude Heavy Industry Chinese team (5 personnel × 12 days), with Vietnamese workers providing assistance; installation labor is included in the total contract price.
Southeast Asia's steel production capacity expansion is expected to continue through at least 2028, and Kelude Heavy Industry has already built strong brand recognition and customer trust in the region. The next growth frontier is the Middle East—where demand is even greater, but technical requirements are more demanding.
