SMSTEEL
SMSTEEL
Direct mill procurement catalog featuring electrical silicon coils, cold-rolled structural tubing, and precision galvanized steel profiles.
In modern electromechanical engineering, Low Silicon Steel (typically containing 0.5% to 1.8% Silicon by weight) occupies a vital niche between standard carbon structural steels and high-silicon electrical steels (2.8%–3.5% Si). As global industries transition toward eco-design directives, high-efficiency fractional horsepower (FHP) motors, and ultra-compact electromagnetic actuators, selecting the right low silicon steel grade is critical for balancing electromagnetic performance, cold formability, and tool life economics.
Unlike standard Non-Grain Oriented (CRNGO) steels with high silicon content that exhibit brittleness and elevated die wear during high-speed blanking, low silicon alloys engineered by leading Chinese manufacturers provide high magnetic saturation induction ($B_{50} \ge 1.68\text{ T}$ to $1.75\text{ T}$) alongside exceptional ductility. This unique balance enables electric motor manufacturers to produce laminations with minimal edge burrs and extended die stamping cycles exceeding 300,000 strokes per sharpening.
Understanding the balance between core loss ($P_{1.5/50}$), magnetic flux density ($B_{50}$), and mechanical blanking mechanics in low silicon electrical steel grades.
Low silicon formulations maintain a higher saturation magnetization than 3.2% Si grades. Under high excitation fields (5000 A/m), low silicon steel reaches higher flux densities ($B_{50} \ge 1.70\text{ T}$), making it ideal for compact motors requiring maximum torque density in small frame sizes.
Silicon acts as a solid-solution strengthener that increases hardness and acoustic vibration during stamping. By controlling Si content below 1.8%, sheet hardness is maintained below 150 HV, dramatically reducing progressive carbide die wear and eliminating lamination edge burrs.
For standard line-frequency applications (50 Hz / 60 Hz), low silicon steel offers a cost-effective loss profile ($P_{1.5/50} \approx 4.70 - 8.00\text{ W/kg}$). It eliminates expensive high-temperature box annealing steps required for high-grade silicon coils.
| Steel Grade Category | Silicon Content (Si %) | Nominal Thickness (mm) | Max Core Loss $P_{1.5/50}$ (W/kg) | Min Flux Density $B_{50}$ (T) | Yield Strength (MPa) | Primary Industrial Application |
|---|---|---|---|---|---|---|
| Low Silicon Motor Steel (50W800 / M800-50A) | 0.50% – 0.80% | 0.50 mm | ≤ 7.50 – 8.00 | ≥ 1.73 | 240 – 290 | Fractional HP Motors, Ceiling Fans, Small Pumps |
| Mid-Low Silicon Steel (50W600 / M600-50A) | 1.00% – 1.30% | 0.50 mm | ≤ 5.80 – 6.00 | ≥ 1.71 | 270 – 320 | Hermetic Compressor Motors, Washing Machine Stators |
| Standard Electrical Steel (50W470 / M470-50A) | 1.40% – 1.80% | 0.50 mm | ≤ 4.50 – 4.70 | ≥ 1.69 | 290 – 350 | Industrial General-Purpose Motors, Ballasts |
| Thin-Gauge Low-Si Alloy (35W550) | 1.20% – 1.50% | 0.35 mm | ≤ 5.20 | ≥ 1.70 | 310 – 360 | High-Speed Auxiliary Automotive Actuators |
| CRGO High Silicon (0.23mm Transformer Grade) | 3.00% – 3.30% | 0.23 mm | ≤ 0.85 – 0.95 ($P_{1.7/50}$) | ≥ 1.88 | 380 – 430 | Power & Distribution Transformer Cores |
Providing custom low-silicon steel coil slit ribbons, annealed sheets, and structural tubular profiles tailored to industrial manufacturing ecosystems.
Low silicon steels like M600 and M800 are heavily specified for hermetic compressor stators in refrigerators and air conditioners. High induction guarantees efficient start-up torque, while precise cold-rolling tolerances ensure tight stacking factors (> 97%).
Modern vehicles contain over 40 fractional motors (windshield wipers, window regulators, power seats, electronic throttle control). Low silicon steel provides the necessary magnetic flux in micro-scale housings without incurring high material costs.
Low magnetic coercivity ($H_c$) prevents residual magnetism buildup in relay armatures and control valves. Low silicon content ensures fast magnetic response and reliable mechanical release in automation systems.
A premier global steel manufacturer and supply chain leader delivering top-tier electrical silicon steel, structural tubing, and customized metal products worldwide.
Founded in 2010, STEP MILLION STEEL SUPPLY CHINA CO., LTD. is a leading steel material supplier and manufacturer in China. Our extensive production catalog includes pre-galvanized steel pipe, hot-dip galvanized steel pipe, ERW pipe, square and rectangular tube, scaffolding tube, steel plate coils, cold-rolled steel sheet (coil) SPCC, pickled steel sheet (coil) SPHC, galvanized steel sheet (coil) SGCC/SECC, stainless steel sheet (coil) STS, aluminum sheet (coil) AL, and electrical silicon steel SI.
Our state-of-the-art manufacturing infrastructure spans over 66,700 square meters, employing more than 300 highly skilled personnel and operating eight High-Frequency (HF) welded production lines. Each line is integrated with full-suite automated machinery executing at least five rigorous production steps, driving a massive monthly output of 100,000 tons, half of which is exported to international markets.
Our facility houses an advanced molding workshop backed by 20 specialized R&D engineers possessing over 10 years of metallurgical experience. Quality control remains our paramount operational priority: over 20 dedicated inspectors utilize top-tier testing instruments imported from Germany and Japan to ensure raw materials conform strictly to GB, ASTM, BS, DIN, and CE standards.
STEP MILLION STEEL maintains close strategic partnerships with premier domestic steel conglomerates, including Baowu Iron and Steel Group, Hebei Iron and Steel Group (HBIS), Shougang Group, Bengang Group, Anshan Iron and Steel Group, Hebei Jingye, Hebei Jinxi, Lingyuan Iron and Steel, and New Tiangang Group. Delivering over 700,000 tons of steel annually with a turnover nearing 4 billion RMB, we bring unparalleled scale, pricing power, and quality assurance to global buyers.
Serving clients in nearly 100 countries across Middle & South America, Southeast Asia, the Middle East, and Africa with dedicated technical customer support.
Advancing next-generation electrical steel through decarbonized steelmaking, ultra-thin cold rolling, and AI-driven domain refinement.
Transitioning raw material synthesis from traditional blast furnaces to Hydrogen-based Direct Reduced Iron (DRI) paired with Electric Arc Furnaces (EAF). This lowers embedded carbon footprints by up to 60% while strictly limiting trace tramp elements (N, C, S) that impair magnetic domain mobility.
Demands for high-frequency efficiency in modern brushless DC (BLDC) motors drive low-silicon steel thickness from traditional 0.50mm down to 0.35mm and 0.20mm. Thin rolling minimizes eddy current losses while preserving the mechanical ductility required for high-speed stamping.
Developing non-toxic, semi-organic coatings (conforming to REACH and RoHS Directives) that enhance interlaminar resistance ($R_i > 50\ \Omega\cdot\text{cm}^2/\text{lamination}$) while resisting heat during stress-relief annealing up to 750°C.
Operational excellence, strict zero-defect quality control, and flexible global logistics engineered for seamless supply chains.
With over 15 years of metallurgical and export expertise, STEP MILLION STEEL possesses a profound understanding of international standards (ASTM, EN, JIS, GB) and complex buyer specifications across construction, appliance, and motor industries.
Our multi-stage production monitoring protocols eliminate quality claims. All raw materials originate from audited premier mills (Baowu, HBIS, Shougang) and undergo full mechanical, chemical, and electromagnetic testing prior to shipment dispatch.
Our standardized client service response framework ensures all customer inquiries are answered within 24 hours, with detailed technical proposals and quote packages generated within 48 hours. Flexible payment terms and trial orders are supported.
Expert answers to common engineering, procurement, and technical performance questions regarding low silicon steel coils and sheets.
Explore our full product lineup including electro-galvanized plates, stainless coils, HRPO plates, scaffolding systems, and high-strength structural products.
