Eight projects across China, Southeast Asia and West Africa — the equipment, the scope, and the outcomes.
Blue Reconditioning — anonymised project. Customer-identifying details are omitted from this summary.
About Blue ReconditioningDuring the section-mill overhaul at Shiheng Special Steel, DUCHENG took over the full maintenance cycle for 43 Siemens S120 drives — accepted December 29, 2025, delivered complete by January 26, 2026. The rolling-mill equipment department followed up with a formal letter of appreciation for the work's professionalism and discipline.
Environment assessment · parameter backup & safety briefing · disassembly & deep dust removal · thermal-paste renewal · board cleaning & insulating-varnish coating · DC-capacitor replacement · full component performance testing
After more than fifty years of running its own electrical maintenance, Hangzhou Iron & Steel Group handed imported equipment to a third party for the first time — DUCHENG took over every ABB drive at the converter steelmaking plant, a fleet already 7–12 years into service.
Two months of professional maintenance later, trip and failure events fell from two to three per month to roughly one every six months. The cooperation grew: high- and low-voltage drives of multiple brands across the plant, an equipment and spare-parts database, emergency-response plans and a periodic inspection system — then three-year contracts covering the coking plant, EAF plant, ironworks and power company.
DUCHENG was the only external technical team serving Hangzhou Steel's main production right up to the Banshan base's final day — when the converter plant signed one last supplementary contract with DUCHENG, settled the same day, marking the end of more than 50 years of operation.
Two DUCHENG engineers travelled to the Hanrui nickel project — a 20,000-tonne-per-year nickel-matte facility — to bring the drive systems to readiness: parameter calibration, performance testing and operating-risk inspection, completed so the project reached its first ignition on schedule.
At the Atlantic end of the CNPC Niger–Benin pipeline (WAPCO), four imported-brand medium-voltage VFDs drive the crude loading pumps. DUCHENG engineers commissioned them into service in 2024 under high-salinity, high-humidity coastal conditions — resolving transit-damaged components together with the EPC contractor ahead of the terminal's first crude loading. In February 2025, the project operations department sent a formal letter of appreciation.
Shagang Group converter furnace #1 tilting VFD upgrade. The DUCHENG team replaced the original Siemens S120 series drives with the ES70 series and upgraded the PLC control system, completing the full project in 96 hours — three days ahead of the seven-day planned window. The factory and logistics leadership issued a formal commendation on project completion.
Tengyue New Materials faced an urgent failure across its DC600-502 and DC1500/07 drive fleet. DUCHENG deployed a workshop team to carry out batch capacitor replacement and performance testing across all 179 units, returning the line to operation within the emergency response window.
A long-running maintenance relationship with the Qixia facility, covering its SM150 VFD fleet. DUCHENG carried out structured maintenance campaigns in 2019 and again in 2025, building a cumulative service record across the drive population and establishing a preventive care baseline for the plant's production continuity.
Original documents remain in their published language. Localized text below is a factual summary, not a replacement for the original.
Open the original letterThe letter records the on-site team’s response to transit-damaged components and its support for commissioning four medium-voltage loading-pump drives at the Sèmè terminal.
The rolling-mill equipment department commended the team after maintenance of 43 Siemens S120 drives was completed and accepted within the planned overhaul period.
A readable original scan is not currently published on this site; no substitute document has been fabricated.
Send the drive brand, model, fault code and nameplate photo — an engineer reviews every request.