Explore our top-tier collection of high-permeability grain-oriented (CRGO) and non-oriented (CRNGO) electrical steel laminations, manufactured to strict international standards.
Ningbo Puppet Steel Co., Ltd. is a professional, world-class Steel Sheet Manufacturer & Cold Rolled, Hot Rolled & Galvanized Steel Supplier. We are committed to providing premium-grade, highly efficient silicon steel sheets and tailored metallic processing solutions for a diverse global clientele. Serving structural engineering, electric grid infrastructure, automotive powertrain units, renewable wind/solar power generators, home appliances, and high-precision industrial electronics, we have built a long-standing reputation for engineering excellence and delivery reliability.
Strategically located in Ningbo, China—adjacent to one of the world's largest deep-water ports—we utilize integrated logistics and operate advanced metallurgical slitting, cutting, and laser-scribing plants. Our facility is equipped with modern, high-precision quality inspection systems, state-of-the-art cold rolling mills, and continuous annealing lines. Our product catalog features cold rolled sheets, hot rolled steel, galvanized profiles, pre-painted (PPGI) coils, carbon steel, and specialized silicon steel laminations.
To satisfy demanding technical criteria, we provide versatile OEM/ODM manufacturing. Our engineering cycle spans raw silicon steel coil selection, laser micro-scribing for core loss control, stress-relief annealing under shielding atmospheres, and advanced surface coating applications (such as Carlite and C-5 chromium-free systems). Every step is monitored to guarantee tight dimensional tolerances, high stacking factors, and prolonged component lifetime in harsh operating conditions.
Delve into the metallurgical trends shaping the next generation of electromagnetic core materials, from ultra-thin gauges to reduced magnetostriction.
Developing ultra-thin CRNGO sheets down to 0.15mm and 0.10mm for high-rpm electric vehicle motors. Thin laminations significantly curb high-frequency eddy current losses under variable speed drives.
Applying advanced thermal and optical laser scribing to grain-oriented (CRGO) steel sheets. This micro-structuring refines magnetic domain spacing, reducing anomalous loss by up to 30% for ultra-high voltage grids.
Alloying adjustments and crystal orientation controls aimed at reducing magnetostriction-induced hum in transformers. This is critical for noise abatement in urban substation units.
Pioneering chromium-free, high-resistivity organic-inorganic hybrid coatings (Class C-5 and C-6). These deliver excellent corrosion protection, weldability, and punchability with zero environmental footprint.
Our tailored electrical steel designs help optimize performance across multiple heavy industries and energy transmission networks.
By replacing standard grade motor cores with our specialized thin-gauge silicon steel sheets, electric motor manufacturers achieved:
Our manufacturing facility in Ningbo combines automated cold rolling technology with advanced logistics to guarantee supply chain stability.
How to choose the correct electrical steel grade for your project, ensuring compliance with international manufacturing and safety standards.
When purchasing electrical steel, engineers and procurement officers must evaluate critical material characteristics:
We manufacture and certify our electrical steel products in accordance with global industry standards:
Get professional, technical answers to common B2B procurement and engineering questions regarding electrical steel laminations.
CRGO (Cold Rolled Grain-Oriented) steel undergoes specialized thermomechanical processing to align its grain structures in a single direction. This configuration provides high permeability and low core loss in the rolling direction, making it ideal for static equipment like power and distribution transformers. CRNGO (Cold Rolled Non-Grain-Oriented) steel features isotropic magnetic properties (uniform in all directions), which is essential for rotating machinery such as electric vehicle traction motors and industrial generators.
Adding silicon (typically 1.5% to 3.5%) increases the electrical resistivity of the iron matrix. Higher resistivity reduces eddy current losses under alternating magnetic fields. However, increasing silicon content beyond 3.5% makes the steel brittle and more difficult to cold-roll and punch.
We offer various coating options depending on the application. These include inorganic coatings (C-4) for heat resistance, organic coatings (C-1) for punchability, and hybrid organic-inorganic coatings (C-5 and C-6) to ensure high interlaminar resistance, pressure stability, and corrosion protection. All our coatings are RoHS and REACH compliant.
Laser-scribing introduces localized thermal stresses on the sheet surface. This process refines the magnetic domains, dividing wider domains into narrower ones. The narrower domains rotate more easily under alternating magnetic fields, reducing anomalous eddy current losses.
Browse our specialized alloys, pre-painted sheets, and customized housings designed for high-performance industrial applications.
Inside Ningbo Puppet Steel: Advanced cold rolling lines, precision testing labs, and protective slitting processes.
Puppet Steel