Immediate dispatch available for priority automotive components, construction structural elements, and electronics casings.
Annual Production Capacity (Tons)
Thickness Precision Tolerance
European Standard Alignment
Technical & Logistical Support
Bulgaria's strategic geographic placement as the gateway to Eastern Europe and the Balkans has accelerated its positioning as a regional manufacturing hub. Industrial zones in Sofia, Plovdiv, Varna, and Burgas have witnessed immense growth in automotive component fabrication, electrical cabinet manufacturing, HVAC equipment assembly, and white goods production. Underpinning this industrial expansion is a fundamental requirement for high-precision cold rolled steel sheets that adhere to strict European performance benchmarks.
Cold rolled steel sheets are valued for their exceptional dimensional tolerance, high-quality surface finish, and predictable mechanical behaviors under stress. Unlike hot rolled alternatives, cold rolled metals are finished at room temperature, which induces work hardening and yields superior tensile strength, hardness, and ductility. For Bulgarian stamping facilities, HVAC factories, and automotive contractors, sourcing materials that eliminate die-wear issues and material fracturing is crucial to maintaining operational margins. Ensuring consistency across yield strength, elongation percentages, and surface roughness (Ra values) is a top priority.
Modern automated stamping and laser cutting plants in Plovdiv and Sofia depend on uniform steel thickness to prevent operational downtime. Standard deviations in sheet thickness can cause variations in stamping springback, leading to out-of-tolerance components and increased scrap rates. By utilising precision cold rolled steel with tolerances controlled down to ±0.02mm, manufacturers can optimize tooling longevity and maintain assembly-line flow. Additionally, cold rolled steel's clean, oxide-free surface is ideal for direct application of powder coatings, cataphoretic painting (KTL), or electrogalvanizing, which are standard requirements for outdoor electrical cabinets and automotive panels.
Optimized for deep-drawing (DC04/DC06) to withstand complex structural stamping for crash-safety structural panels and reinforcements.
Delivers flat surfaces with high corrosion resistance and uniform coating capability, perfect for boilers, casings, and heat exchangers.
Excellent flatness tolerance (under 3mm/m) makes it ideal for automated laser cutting and CNC bending without micro-cracking.
Tailored mechanical properties engineered to support Bulgarian heavy fabrication and structural design demands.
In accordance with global quality frameworks like EN 10130 (European standard for cold rolled low carbon steel flat products), cold rolled steel sheets must be designated based on their metallurgical purity and mechanical capability. We supply materials that fully comply with these standards, providing Mill Test Certificates (MTC) according to EN 10204 3.1 for every batch delivered to Bulgaria.
| Steel Grade (EN 10130) | Equivalent Grade (JIS G3141) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A80 (%) min | Primary Application |
|---|---|---|---|---|---|
| DC01 | SPCC | ≤ 280 | 270 - 410 | ≥ 28 | Simple bending, general packaging, cladding panels |
| DC03 | SPCD | ≤ 240 | 270 - 370 | ≥ 34 | Deep drawing, domestic appliance housings, enclosures |
| DC04 | SPCE | ≤ 210 | 270 - 350 | ≥ 38 | Intricate structural stamping, automotive body shells |
| DC05 | SPCEN | ≤ 180 | 270 - 330 | ≥ 40 | Extra-deep drawing, specialized industrial components |
| DC06 | - | ≤ 170 | 270 - 330 | ≥ 41 | Super-deep drawing, zero carbon-aging components |
Low carbon concentration is crucial to preventing brittleness during deep drawing. Our cold rolled steel sheets maintain a carbon content ($C$) of less than 0.12% (down to 0.02% for deep drawing grades like DC06), and phosphorus ($P$) and sulfur ($S$) levels under 0.025%. This prevents internal crack propagation and improves welding performance in automated fabrication lines. The reduction of trace impurities ensures that whether you use laser cutting, welding, or severe bending, the steel sheet responds consistently without cracking or deformation.
Ningbo Puppet Steel Co., Ltd. is a professional Steel Sheet Manufacturer | Cold Rolled, Hot Rolled & Galvanized Steel Supplier committed to providing high-quality steel products and customized metal solutions for customers worldwide. Serving industries such as construction, infrastructure, manufacturing, automotive, energy, home appliances, and industrial equipment, the company has built a strong reputation for reliable products and consistent service.
Located in Ningbo, China, Puppet Steel operates advanced processing and manufacturing facilities equipped with modern production lines and precision quality inspection systems. The company specializes in a comprehensive range of steel products, including cold rolled steel sheets, hot rolled steel sheets, galvanized steel sheets, galvalume steel sheets, prepainted steel sheets, carbon steel sheets, structural steel sheets, and customized steel processing solutions.
With extensive industry experience, the company offers flexible OEM and customized manufacturing services to meet various project requirements. From material selection and cutting to surface treatment and packaging, every production stage is carefully managed to ensure product consistency, dimensional accuracy, and long-term performance. Strict quality control procedures are implemented throughout the manufacturing process to comply with international standards and customer specifications.
Puppet Steel focuses on delivering durable, corrosion-resistant, and cost-effective steel products suitable for demanding applications in both domestic and international markets. The company maintains long-term partnerships with contractors, distributors, wholesalers, fabricators, and industrial manufacturers across North America, Europe, Southeast Asia, the Middle East, and other global regions. Driven by innovation, quality, and customer satisfaction, Ningbo Puppet Steel Co., Ltd. continuously invests in technology upgrades and production efficiency improvements. Through competitive pricing, stable supply capacity, timely delivery, and professional technical support, the company strives to become a trusted global partner for steel sheet manufacturing and metal material solutions.
Fully traceable steel sheets conforming to European manufacturing and safety directives.
Purchasing cold rolled steel coils and sheets from international factories requires a thorough understanding of European import compliance frameworks. With the European Union's implementation of the Carbon Border Adjustment Mechanism (CBAM), Bulgarian steel importers are required to report the embedded carbon emissions of their imported metal products. Ningbo Puppet Steel provides detailed emissions documentation to help our clients navigate the transition period, minimizing the risk of administrative penalties.
In addition to environmental mandates, anti-dumping duties and tariff quotas (safeguards) are actively enforced at EU borders, including Bulgarian ports. Importers must confirm that the origin declarations, HS codes (such as 7209 for cold rolled flat products), and mill chemical structures are accurate. Working with a reliable supplier like Ningbo Puppet Steel ensures that all documentation is clear, helping to prevent customs clearance delays at Varna or Burgas.
Our logistical routes are structured to keep transit costs low and schedules predictable. From the Port of Ningbo-Zhoushan, cargo is routed via container vessels or bulk carriers to the Port of Burgas or the Port of Varna. Average transit times range from 30 to 35 days. For fabricators in western Bulgaria, such as Plovdiv or Sofia, we also utilize transit routes through the Port of Thessaloniki in Greece, which connects directly to the Bulgarian rail and road freight corridors. Our export team coordinates customs paperwork, marine insurance, and sea-freight packaging to ensure your steel arrives on schedule and in excellent condition.
The cold rolling process at Ningbo Puppet Steel Co., Ltd. incorporates advanced technologies designed to enhance structural uniformity and mechanical properties.
The steelmaking process begins by running hot rolled coils through continuous pickling lines to strip off iron oxide scale. Once cleaned, the sheets are passed through reversing or tandem cold reduction mills. Applying high-tonnage compressive forces reduces the sheet thickness to the target specification (down to 0.12mm) while refining the steel's grain structures.
To restore ductility lost during cold reduction, the steel undergoes either batch annealing (BA) or continuous annealing (CA). Continuous annealing systems heat the steel strip in a protective hydrogen-nitrogen gas mix, preventing oxidation while recrystallizing the ferrite grains. This process ensures the consistent yield strength and elongation required for automated stamping operations.
Following annealing, a final light skin-pass (temper rolling) is applied. This reduces yield-point elongation, preventing the formation of stretcher strains (Lüders lines) during deep drawing. Skin-passing also refines the surface finish (matte, bright, or rough) to match the painting and plating requirements of the final application.
Looking ahead, Ningbo Puppet Steel is focusing on reducing emissions across our production processes. Our research and development efforts are centered on optimizing hydrogen-based reduction and utilizing renewable energy sources to align with the EU's carbon neutrality goals, helping Bulgarian buyers meet future environmental requirements.
Transporting steel across oceans requires robust packaging to prevent moisture and salt spray damage. Ningbo Puppet Steel uses specialized seaworthy packaging to ensure cold rolled sheets arrive free from rust and physical deformation.
Every cold rolled coil or sheet stack is wrapped in anti-rust VCI (Volatile Corrosion Inhibitor) paper, followed by high-density polyethylene film. Steel edge protectors, metal strapping bands, and heavy wooden or steel skids are applied to secure the load. This ensures the steel is protected against shifting and moisture during sea transport to Burgas or Varna.
Every shipment is accompanied by complete documentation, including Mill Test Certificates (MTC) to EN 10204 3.1, chemical analysis reports, tensile testing logs, packing lists, and Certificates of Origin. We also assist with local import clearances, helping to ensure a smooth transition through Bulgarian customs checkpoints.
Key technical and logistical information for Bulgarian purchasing departments and manufacturing engineers.
Puppet Steel
