SMSTEEL
SMSTEEL
Explore our highly specified structural components, custom-milled flat-rolled profiles, and specialized silicon steel grades.
High-Quality Slip on Plate Flanges Flat Plain Welding Carbon Steel stainless steel Flange blind flange Supplier, Factories
View Details →
Wholesale Steel Flat Bar Iron And Steel Flat Rolled Products Bar Galvanized Flat Steel Carbon Steel Flat Manufacturer, Factories
View Details →
High-Quality Silicon steel coil (CRNGO) Manufacturers, Factory
View Details →
High-Quality GI PPGI PPGL Galvanized Corrugated Metal Roof G550 steel plate steels roofing sheets Metal plate Manufacturer, Suppliers
View Details →
Wholesale Galvanized steel coils are mainly used in the manufacturing of steel pipes and steel sections. Manufacturer, Supplier
View Details →
High-Quality SECC ELECTRICAL GALVANIZED STEEL COILS FOR DOOR GATE Supplier, Factories
View Details →
High-Quality 0.23mm CRGO Grain Oriented Electrical Silicon Steel Coil for Transformer Manufacturer, Manufacturers
View Details →
Wholesale High Strength Spiral Steel Pipe A53 A106GR.B Spiral Steel Pipe Manufacturer, Factories
View Details →The cold rolled steel process refers to the deformation of steel sheets, strips, or coils at room temperature, which is below the recrystallization threshold of the metal. Operating at these temperatures induces strain hardening, effectively increasing the overall tensile and yield strength by up to 20%. Unlike hot rolling, which can leave scale deposits and dimensional deviations, cold rolling offers exceptionally tight dimensional tolerances (down to ±0.01 mm) and an aesthetic, smooth, or matte surface texture optimal for paint and protective coatings.
By routing hot-rolled steel through advanced multi-stand tandem mills, the grain structures are compressed and aligned along the direction of rolling. This orientation elevates mechanical properties and allows for down-gauging without sacrificing durability. This process makes cold rolled steel the material of choice for high-stress applications in automotive structural members, energy infrastructure, electrical machinery, and electronic housings.
Founded in 2010, STEP MILLION STEEL SUPPLY CHINA CO., LTD. has evolved into a premier manufacturer and raw material supplier of advanced structural steel configurations. Our comprehensive operations span over a state-of-the-art 66,700 square meters production footprint, supported by a dedicated taskforce of more than 300 skilled professionals.
Our production department operates eight High-Frequency welded lines. Each production line features a synchronized suite of auxiliary machinery to oversee a minimum of five primary fabrication stages, ensuring optimal physical properties and weld integrity. This production density guarantees a monthly capacity of 100,000 tons, with 50% systematically designated for global export markets.
Innovation at STEP MILLION is guided by our specialized molding workshop, staffed by 20 R&D engineers who carry over a decade of metallurgical design and engineering experience each. From micro-alloy optimization to custom section geometries, we deliver engineering expertise that supports projects across multiple industries.
We maintain robust supplier agreements with state-owned steel conglomerates to ensure uninterrupted raw material sourcing and pricing stability.
We work closely with major domestic mills, including Baowu Iron and Steel Group, Hebei Iron and Steel Group (HBIS), Shougang Group, Bengang Group, Anshan Iron and Steel Group, Jingye Group, Jinxi Iron & Steel, Lingyuan Iron & Steel, and New Tiangang Group.
Our annual distribution capacity exceeds 700,000 tons of finished steel across mainland China and global territories, driving a commercial turnover of nearly 4 billion Yuan (RMB). This volume secures primary allocation rights even during seasonal shortages.
Our raw materials comply with GB, ASTM, BS, or DIN specifications. Led by 20+ inspectors with over 10 years of experience, our QC procedures utilize testing instrumentation sourced from Germany and Japan. CE certificates are provided upon request.
A technical reference matrix of standard steel grades processed within our cold-reduction operations.
| Standard | Common Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Primary Industrial Applications |
|---|---|---|---|---|---|
| JIS G3141 | SPCC / SPCCT | ≤ 240 | ≥ 270 | ≥ 32 | Automotive panels, home appliance casings, switchgear boxes. |
| ASTM A1008 | CS Type A / B | 140 - 275 | 270 - 410 | ≥ 30 | Structural brackets, light-gauge framing, metal tubing. |
| EN 10130 | DC01 / DC03 | ≤ 280 | 270 - 410 | ≥ 28 | Deep drawing applications, precision stampings, radiators. |
| JIS G3141 | SECC (Electro-Galvanized) | ≤ 240 | ≥ 270 | ≥ 32 | Computer chassis, architectural panels, door & gate framing. |
| IEC 60404 | CRNGO (Silicon Steel) | 250 - 380 | 350 - 520 | ≥ 22 | Electric motor rotors, transformer cores, generators. |
Our high-precision cold rolled steel materials provide structural integrity and performance across a wide range of global sectors.
Providing high-yield framing profiles, purlins, structural channels, and robust scaffolding systems engineered to withstand heavy mechanical loads.
Delivering high-aesthetic SPCC and SECC sheets with optimized surface tension, designed for partners like LG Electronics.
Supplying anti-corrosive prepainted galvanized iron (PPGI) and corrugated metal sheets tailored for long-term outdoor use.
Furnishing ultra-deep drawing quality steel sheets that combine high yield strength with formability for critical crash structures.
Manufacturing highly dimensional tubes, enclosures, and brackets requiring precise folding and clean weld profiles.
Supplying CRNGO silicon steel with low core loss parameters to maximize efficiency in motors, magnetic devices, and transformer cores.
Supporting projects in nearly 100 countries across Middle & South America, Southeast Asia, the Middle East, and Africa.
Our deep understanding of chemical compositions, mechanical characteristics, and rolling tolerances helps prevent structural anomalies in final fabrications.
We enforce a zero-defect policy, backed by raw material traceability and independent testing labs, to prevent compensation claims.
We confirm initial RFQs within 24 hours, and compile complete technical and logistics solutions within 48 hours.
We offer flexible cooperation terms, including the acceptance of small-scale initial orders to build trust.
Request Technical consultation
The cold rolling sector is evolving toward carbon reduction, green manufacturing, and digital quality monitoring. Modern metallurgical plants are incorporating AI-driven gauge systems that measure thickness in real-time using laser interferometry. This allows mills to adapt roll force dynamically, eliminating variations during high-speed runs.
Additionally, processing is shifting toward hybrid hydrogen annealing furnaces. Replacing traditional nitrogen-hydrogen mixes with pure green hydrogen speeds up processing times and removes carbon residue, producing clean surfaces ready for paint or plating without requiring extensive acid wash cycles.
Our design team actively develops next-generation, high-magnetic-induction electrical steel (CRNGO and CRGO) to meet the performance needs of high-frequency electric vehicle drivetrains and smart-grid power transformers.
Technical answers to common questions regarding cold-rolled materials, quality standards, and logistics.
Cold rolled steel is processed below its recrystallization temperature (typically at room temperature), which yields tighter dimensional tolerances, higher tensile strength, and a smoother surface finish. Hot rolled steel is processed at high temperatures (typically over 1700°F), which can lead to scaling and slightly less precise dimensions, but makes it highly ductile for thicker structural components.
SECC (Electro-galvanized) features a thin, highly uniform zinc coating, making it ideal for precision electronics, computer chassis, and painted metal furniture where precise fit and finish are critical. SGCC (Hot-dip galvanized) offers a thicker, spangled zinc layer, providing superior corrosion resistance for outdoor construction framing, roofing, and HVAC ductwork.
We work with national mills like Baowu and Shougang to secure high-quality raw materials. Our 20+ inspectors monitor the chemical composition, tensile characteristics, and surface finish of our products. All shipments are accompanied by a Mill Test Certificate (MTC) conforming to EN 10204 3.1, and CE certification is available for European applications.
Standard widths and grades can be dispatched within 10 to 15 days from our inventory. Custom dimensioning, deep drawing grades, or specific surface treatments generally require 25 to 30 days, which includes structural analysis and custom roll tooling calibration.
Browse our selection of specialized piping, precision alloy coils, and surface-treated structural materials.
Wholesale Astm Carbon Steel Seamless Steel Pipe For Construction Seamless Tube Seamless Pipe Manufacturer, Suppliers
View Details →
Wholesale Zn Al Mg coated steel sheet 275g zinc Aluminum magnesium steel sheet plate ZM AZM Alloy Coating for solar mounting structure Manufacturer, Factory
View Details →
High-Quality Electrogalvanized Manufacturer, Factory
View Details →
Wholesale Hot Rolled Pickled & Oiled (HRPO) Steel Heavy gauge, wide plate steel with a beautiful surface finish Manufacturer, Factory
View Details →
Wholesale Cold rolled high strength steel sheets with an extra deep drawing quality Suppliers, Factories
View Details →
Wholesale Q235 Q195 Q345 ST S355 Hot rolled carbon steel plates Factory, Factories
View Details →
Wholesale 2B BA No. 1 No. 4 Hl 8K Cold Rolled 201 304 304L 316 316L 309S 310S 321 430 2205 904L Roll Stainless Steel Coi Manufacturer, Supplier
View Details →
High-Quality Construction Pipe 50*50mm 4x4 Square Tubing Square Pipe 20mm Metal Square Tube for Steel Fence post Suppliers, Factory
View Details →