Product range — actual catalogue images
The product images below are hosted on the manufacturer's official website (transformerstrip.com) and link directly to the manufacturer's catalogue. Click any image to view the full specification page in a new tab.
Cold-rolled grain-oriented (CRGO) silicon steel coil — premium electrical steel for transformer cores.
Silicon steel sheet bundle — slit and stacked for direct supply to transformer manufacturers.
High-purity copper foil roll — for transformer winding, busbars, and electrical applications.
Electrical steel grades and applications
| Grade family | Typical specifications | Magnetic loss (W/kg at 1.7T) | Best applications | FOB China typical price (per ton) |
|---|---|---|---|---|
| CRGO Premium (HiB / domain-refined) | 0.23-0.27mm; B800 ≥ 1.92T | 0.85-0.95 | Premium power transformers, energy-efficient distribution | USD 2,800-3,800 |
| CRGO High-grade | 0.27-0.30mm; B800 ≥ 1.88T | 0.95-1.10 | Standard distribution transformers, premium-tier OEMs | USD 2,400-3,200 |
| CRGO Standard | 0.30-0.35mm; B800 ≥ 1.83T | 1.10-1.30 | Standard distribution, general industrial transformers | USD 1,950-2,650 |
| CRGO Economy | 0.35mm; B800 ≥ 1.78T | 1.30-1.50 | Cost-sensitive distribution, dry-type transformers | USD 1,650-2,200 |
| CRNGO / CRNO Semi-processed | 0.35-0.50mm; isotropic loss | 2.5-3.5 (at 1.5T) | Motor stators, small generators, ballasts | USD 950-1,400 |
| CRNGO Fully-processed (low-loss) | 0.35mm; oriented-isotropic mix | 1.8-2.5 (at 1.5T) | Premium motors, electric vehicle traction motors, premium generators | USD 1,400-2,200 |
| Amorphous metal (Metglas type) | ~25 microns thickness | 0.20-0.35 | Premium energy-efficient distribution transformers | USD 4,800-7,500 |
| Nanocrystalline (Vitroperm type) | ~20 microns thickness | 0.15-0.30 | Common-mode chokes, current transformers, EMI filtering | USD 8,500-15,000 |
Copper and aluminum conductor products
| Conductor type | Typical specifications | Conductivity | Best applications |
|---|---|---|---|
| Copper foil (rolled) | 0.05-0.5mm thick; widths 50-1500mm | ≥101% IACS (high-purity) | Foil-wound transformer windings, large generators |
| Copper strip (annealed) | 0.5-3mm thick; widths 10-300mm | ≥100% IACS | Wound transformer windings, busbar applications |
| Copper strip (bare or paper-wrapped) | 1-10mm thick; widths 5-100mm | ≥100% IACS | Power transformer windings (oil-immersed), large machine windings |
| Copper enameled wire (round) | 0.05-3mm diameter; PEW/PEI/PAI insulation | ≥100% IACS | Round-wire winding for transformers and motors |
| Copper enameled wire (rectangular) | 1-10mm × 1-5mm; PEW/PEI insulation | ≥100% IACS | Higher-fill-factor windings for compact transformers |
| Aluminum strip (annealed, bare) | 0.5-3mm thick; widths 10-300mm | ~62% IACS (1350 alloy) | Cost-sensitive distribution transformers, dry-type transformers |
| Aluminum foil (rolled) | 0.05-0.5mm thick; widths 50-1500mm | ~62% IACS | Foil-wound dry-type distribution transformers (cost-driven) |
| Aluminum enameled wire (round) | 0.5-3mm diameter; PEW insulation | ~62% IACS | Cost-sensitive motor/transformer windings |
| Continuously transposed conductor (CTC) | Multiple insulated copper strips bundled | ≥100% IACS effective | Large power transformer windings (lower eddy losses) |
Material selection — copper vs aluminum economics
Aluminum-wound dry-type distribution transformers are the dominant choice for cost-sensitive distribution transformer applications (rural distribution, prefabricated substations, lower-tier markets). Copper-wound oil-immersed distribution transformers remain dominant for premium / urban / industrial applications. The volume and weight penalty of aluminum (15-25% larger transformer for same rating) is acceptable in many distribution applications where space is not critical. The specific economics of aluminum-vs-copper depend on current commodity pricing — copper-vs-aluminum price ratio fluctuates significantly. For OEM transformer manufacturers, dual-material capability (both copper-wound and aluminum-wound product lines) provides market flexibility.
| Criterion | Copper | Aluminum | Implication |
|---|---|---|---|
| Resistivity | 1.68 µΩ·cm | 2.65 µΩ·cm (1350 alloy) | Aluminum needs ~63% more cross-section for same resistance |
| Density | 8.96 g/cm³ | 2.70 g/cm³ | Aluminum about 30% of copper density |
| Specific cost (per ton) | USD 8,000-9,500 | USD 2,300-2,800 | Aluminum about 30% of copper price by weight |
| Cost per equivalent resistance (per kg basis × cross-section needed) | Baseline 100% | Approximately 50-60% of copper | Aluminum cost-saving for transformer windings is ~40-50% |
| Mechanical strength | Higher | Lower (needs careful joint design) | Aluminum joints require special technique; bolted connections need anti-oxidation paste |
| Connection issues | Easy soldering / brazing | Requires specific welding or compression joints | Aluminum windings limit to specialized end-applications |
| Volume penalty | Smaller transformer volume | 15-25% larger transformer for same rating | Aluminum acceptable when space is not critical |
Standard sizes and packaging
| Product | Standard sizes | Packaging unit | Container utilization |
|---|---|---|---|
| CRGO coil (mother coil) | 500-1200mm width × 0.23-0.35mm thick × 4-15 ton coil weight | Steel-banded coil with edge protection | ~22-26 ton in 20' container |
| CRGO slit coil (transformer width) | 30-300mm width × 0.23-0.35mm × 1-5 ton coil weight | Steel-banded coils stacked on pallets | ~22-26 ton in 20' container |
| CRGO sheets (cut to length) | Custom sheet sizes; thickness 0.23-0.35mm | Bundled and strapped on pallets | ~22-26 ton in 20' container |
| CRNGO coil | 500-1200mm width × 0.35-0.50mm thick | Steel-banded coil with edge protection | ~22-26 ton in 20' container |
| Copper foil (large rolls) | 50-1500mm width × 0.05-0.5mm thick × 50-500 kg roll | Cardboard core wrapped in plastic film | ~18-22 ton in 20' container |
| Copper strip (small rolls) | 10-300mm width × 0.5-3mm thick × 25-150 kg roll | Wooden spool or cardboard core | ~18-22 ton in 20' container |
| Aluminum strip / foil | Sizes similar to copper, lower density | Cardboard core / wooden spool | ~6-8 ton in 20' container (volume-limited) |
Pricing brackets — wholesale
Note: Electrical steel and copper pricing tracks underlying commodity (steel + electrical-grade premium for CRGO; LME copper for copper products) plus processing premium. Long-term contracts typically use index-based pricing where the material cost adjusts monthly with commodity index movement plus a fixed processing premium. For high-volume buyers, hedging the underlying commodity exposure may be appropriate.
| Order tier | Total quantity | Discount vs spot | Container utilization | Lead time |
|---|---|---|---|---|
| Sample / small OEM | 500 kg - 5 tons | Spot price + small premium | LCL | 15-25 days |
| Mid OEM transformer manufacturer | 15-50 tons / quarter | Spot - 1-3% | Partial 20' container | 25-40 days |
| Large OEM transformer manufacturer | 50-300 tons / quarter | Spot - 3-7% | Full 20' or 40' container | 35-60 days |
| National distributor / utility OEM | 500+ tons / quarter | Spot - 5-10%; index pricing arrangements | Multiple containers | 45-90 days |
Quality certification and testing
| Standard | Applies to | Test requirements |
|---|---|---|
| GB/T 2521 / IEC 404-8 | CRGO grain-oriented electrical steel | Magnetic loss test, dimensional accuracy, surface insulation |
| GB/T 2521.2 / IEC 404-8-4 | CRNGO non-grain-oriented electrical steel | Magnetic loss test (isotropic), dimensional accuracy |
| ASTM A876 / A977 | Electrical steel for power transformers | Magnetic property testing, dimensional |
| JIS C 2552 / C 2553 | Japanese electrical steel standards | Magnetic property testing |
| ASTM B187 / B49 | Copper foil and strip for electrical applications | Conductivity (% IACS), tensile strength, ductility, surface finish |
| ASTM B209 / B233 | Aluminum sheet and strip | Conductivity, mechanical properties |
| IEC 60317 | Enameled magnet wire | Insulation thickness, breakdown voltage, thermal class |
| NEMA MW1000 | Magnet wire standards (US) | Insulation properties, thermal endurance |
Order workflow — electrical-materials procurement
View the full supplier profile, certifications, contact details, and complete product catalogue.
TransformerStrip — Chinese supplier of transformer-grade electrical materials. Cold-rolled grain-oriented (CRGO) silicon steel in Premium HiB / High-grade / Standard / Economy grades (0.23-0.35mm thickness, JIS / GB / IEC / AISI nomenclature support); non-grain-oriented (CRNGO / CRNO) silicon steel for motor and generator laminations; copper foil and strip for transformer windings (0.05-3mm thick, 5-1500mm width); copper enameled wire (round and rectangular, PEW/PEI/PAI insulation); aluminum strip and foil for cost-sensitive distribution transformers; amorphous metal cores (Metglas-type) for premium energy-efficient transformers; nanocrystalline cores for current transformers and EMI filtering. Mill test certificates per GB/T 2521 / IEC 404-8 / ASTM A876 / JIS C 2552. Slitting services available for transformer-width coils.
- Application analysis — define exact specification per application (CRGO grade, thickness, width; or copper purity, thickness, width); establish quantity per quarter or annual demand
- Specification clarification — for CRGO: grade (Premium / High-grade / Standard), thickness, width tolerance, edge condition (mill-edge / slit-edge), surface insulation type. For copper: purity (oxygen-free vs ETP), thickness, width, temper (annealed / hard), surface finish
- Sample order — typically 50-500 kg per candidate spec; verify magnetic properties (CRGO: Epstein test for loss and B800), dimensional accuracy (thickness ±0.005mm typical, width ±0.05mm), surface quality (insulation continuity for CRGO; oxidation absence for copper)
- Production trial — process sample into actual transformer or motor; verify performance vs spec; document any deviation from expected behavior
- First commercial order — typically 15-50 tons depending on application; specify exact tonnage, packaging, and delivery schedule
- Quality acceptance — every coil should ship with mill test certificate (chemistry, dimensional, magnetic for steel; conductivity for copper); incoming inspection on 5-10% of coils for verification
- Series replenishment — typically monthly or quarterly orders aligned with production schedule; index-based pricing for long-term arrangements; safety stock typically 6-12 weeks of consumption
Frequently asked questions
Companion guide for power-electronics products that use transformer cores and copper windings.
Companion guide for electromagnetic materials — permanent magnets used alongside soft-magnetic electrical steel.
Companion guide for electrical components — contactors used downstream of transformers in distribution panels.
Source: Product images on this page are hosted on the manufacturer's official website (transformerstrip.com) and link directly back to that website. All product information was summarised from the supplier's public catalogue.
Brand mentions and trademark compliance: References to Tier-1 electrical-steel manufacturer brands (Nippon Steel, JFE Steel, ArcelorMittal, ThyssenKrupp, Posco, Baosteel, Wisco, Shougang) and copper-conductor brands (Wieland, Aurubis, Mitsubishi Materials, KME) are made for the sole purpose of describing functional benchmarks and supply-chain context. TransformerStrip is not authorized by, affiliated with, or endorsed by any of these brand owners. Products are aftermarket-fit cross-reference materials manufactured under TransformerStrip's own brand or buyer-private-label only.
Commodity pricing volatility: Electrical-grade silicon steel and copper conductor pricing track underlying commodities (HRC steel + electrical-grade premium for CRGO; LME copper for copper products) which exhibit significant price volatility. Long-term contracts should specify pricing structure (spot, index-based, fixed, or pass-through) explicitly to avoid disputes. For high-volume buyers, commodity hedging strategies may be appropriate.
Pricing & specifications: All price ranges, magnetic property figures, and tier definitions reflect general market observation and may not apply to specific orders. Real-world transformer performance depends on core design, winding technique, and assembly quality in addition to material specifications. Confirm current pricing, MOQ, lead time, and configuration directly with the supplier.
No middleman role: CifyChina provides supplier discovery and editorial content. All transactions occur directly between buyer and supplier through the contact channels published on the supplier's official website.
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