Explore our premium selection of cold rolled structural plates and sheets optimized for high-strength welding, bending, and specialized stamping processes.
Understanding the mechanical properties, crystal orientation, and grain elongation of high-performance steel sheets to maximize product lifetime and processing efficiency.
Cold rolled steel sheets are processed through an intensive thickness reduction method at room temperature, far below the recrystallization temperature. Unlike traditional hot rolling, our specialized cold reduction mills force hot rolled pickled coils through sequential rollers to achieve exceptional dimensional consistency. This cold working mechanism increases the steel’s yield strength and hardness via strain hardening while refining the microstructural grain alignment.
Our processing facilities utilize state-of-the-art automatic gauge control (AGC) systems that monitor physical sheet thickness in real-time, yielding extreme dimensional precision. This ensures that when our customers utilize automated stamping or robotic bending lines, there are zero interruptions or structural failures caused by material inconsistency.
Surface quality is the defining visual characteristic of premium cold rolled sheets. At Ningbo Puppet Steel Co., Ltd., we control every chemical and physical variable in the annealing and skin-pass phases. We offer multiple surface finishes: from bright/semi-bright finishes suited for decorative plating, to matte finishes that act as optimal bases for paint adhesion in modern automotive body panels and home appliance frames.
By implementing a controlled annealing cycle in hydrogen-rich atmospheres, we restore the ductility lost during cold reduction. This delivers an isotropic grain structure, providing high formability, ensuring that deep-drawing grades like DC04, DC05, and DC06 can be formed into extreme shapes without tearing or wrinkling.
| Standard | Steel Grade equivalent | Yield Strength (MPa) | Tensile Strength (MPa) | Min Elongation (%) | Primary Industry Application |
|---|---|---|---|---|---|
| JIS G3141 | SPCC (Commercial Quality) | ≤ 240 | ≥ 270 | 32 (t=1.0mm) | General structural plates, brackets, enclosures |
| EN 10130 | DC01 (Drawing Quality) | ≤ 280 | 270 - 410 | 28 | Automotive components, mechanical hardware |
| EN 10130 | DC04 (Deep Drawing Quality) | ≤ 210 | 270 - 350 | 38 | Internal car panels, highly complex structural pressings |
| ASTM A1008 | CS Type B | 135 - 275 | 270 - 410 | 30 | Home appliances, HVAC ducting, structural framing |
| ASTM A36 | A36 Cold-Finished Equivalent | ≥ 250 | 400 - 550 | 20 | Heavy infrastructure, structural base plates, mounting brackets |
Combining structural expertise with competitive raw material access and advanced deep-processing solutions.
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.
Deploying tailored steel sheet configurations to resolve structural and corrosion challenges across diverse commercial landscapes.
Modern automotive frame design demands high yield strength for crash safety combined with ductility for deep-drawing body contours. Our High Strength Low Alloy (HSLA) cold rolled sheets provide extreme structural weight reduction without compromising passenger compartment safety.
With precise thickness profiles ranging down to 0.12mm, our structural sheet metal integrates flawlessly with automated roll-forming and duct-manufacturing lines. This guarantees tight seams, optimized airflow, and structural longevity under thermal cycling conditions.
From computer server racks to premium domestic appliances (washing machines, refrigerators), we supply cold rolled steel with superior flatness tolerances and paint-adherence qualities, eliminating cosmetic deformities after powder coating.
For international supply chain managers and distributors, sourcing steel sheets from China requires more than assessing price per ton. It demands strict structural quality control systems, logistical reliability, and transparent certification.
At Ningbo Puppet Steel, we manage global delivery channels through Ningbo Port—one of the largest deep-water ports globally. This location minimizes domestic transport friction, providing competitive FOB and CIF pricing structures. Every shipment is tracked from mill raw materials to maritime bills of lading, with Mill Test Certificates (MTC) matching chemical and physical properties against standard designations (EN 10130, ASTM A1008, JIS G3141) as standard procedure.
The steel industry is moving rapidly toward sustainable manufacturing and specialized alloy development. Green steel technology, combined with carbon tracking, is becoming a primary factor in European and North American procurement processes.
Furthermore, the demand for Advanced High-Strength Steels (AHSS) continues to grow, allowing manufacturers to reduce raw material thickness while increasing structural capacity. We are actively upgrading our rolling mills and chemical configurations to support these structural advancements, assuring that our partners remain competitive in their localized markets.
Professional answers to common queries regarding material selection, surface treatments, processing limits, and procurement terms.
SPCC is a commercial-grade steel sheet standard under JIS G3141. It is designed for general forming and light bending where high mechanical elongation is not critical. DC01 is its European standard equivalent (EN 10130), specifying precise deformation and chemistry parameters. ASTM A36, in contrast, is a structural carbon steel standard; cold-finished variations of A36 prioritize yield strength and weldability for structural components, rather than deep-drawing formability.
In automated stamping and roll-forming processes, thickness variations alter the material flow behavior. A variation of even 0.05mm can cause tool wear or tearing. Our cold reduction facilities maintain a precision thickness tolerance of < 0.02mm, ensuring stable performance across multiple fabrication runs.
To prevent oxidation (rust) during ocean transport, our cold rolled sheets can be ordered with custom rust-preventative oiling options (light, medium, or heavy oiling) or with anti-corrosion protective film. For long-term environmental protection, we supply galvanized (zinc-coated) and galvalume (aluminum-zinc-coated) finishes.
Yes. In addition to supplying standard coils, we operate localized processing centers that provide slitting, sheet cutting to custom lengths, bending, and robotic welding services. This allows procurement managers to order pre-fabricated components ready for final assembly, reducing localized processing costs.
Typical factory production and processing lead times range from 15 to 30 days depending on the selected steel grade, specifications, and volume. Standard stock dimensions are available for immediate shipment. We provide transparent delivery timelines on all official quotations.
Complete your supply chain with our range of hot rolled coils, structural steel plates, and wear-resistant sheet configurations.
Puppet Steel