From grade selection to container loading — everything a procurement engineer or metallurgist needs to source precision steel strip with confidence. Sixteen grade families, processing options, quality protocols and the full ordering workflow in one reference.
Precision steel strip is thin, flat-rolled steel manufactured to controlled thickness, width and mechanical-property tolerances. It is produced by cold rolling pickled hot-rolled coil to the target gauge, then annealing, slitting and finishing to customer specification. Unlike commodity sheet, precision strip is optimized for downstream processes that demand consistency — fine blanking, progressive die stamping, deep drawing, spring winding, motor lamination stamping and hot stamping.
Thickness range: typically 0.10 mm to 4.0 mm, with the majority of industrial applications falling between 0.30 mm and 2.5 mm. Below 0.10 mm the material enters foil territory; above 4.0 mm it is generally classified as sheet or plate.
Tolerance grades: precision cold-rolled strip is commonly supplied to thickness tolerances of ±0.01 mm to ±0.03 mm (depending on gauge) and width tolerances of ±0.05 mm to ±0.15 mm after slitting. For critical applications — such as motor lamination stacking where burr and thickness variation directly affect core loss — tighter tolerances and controlled edge quality are specified at the order stage. Understanding the relationship between cold-rolled vs. hot-rolled delivery states is the first step in specifying the right product.
Precision steel strip is organized into 16 commercial grade families, each defined by carbon content, alloying elements and intended processing route. The table below provides a quick reference; each family is summarized in the cards that follow.
| # | Family | Typical grades | Thickness (mm) | Key property | Primary applications |
|---|---|---|---|---|---|
| 1 | Fine Blanking Steel | SAE1010–1045, C15–C45 | 1.0–4.0 | Spheroidized, clean shear face | Automotive gears, seat recliners, door locks |
| 2 | High Carbon Steel | SAE1078, SAE1065, SK5 | 0.3–3.0 | Hardenable, high strength | Springs, saw blades, clutch plates |
| 3 | Alloy Structural | 40Cr, 42CrMo, 20CrMnTi | 0.5–4.0 | Hardenability, toughness | Gears, shafts, structural components |
| 4 | Spring Steel | 65Mn, 50CrV4, 60Si2Mn | 0.3–3.0 | Elastic limit, fatigue resistance | Clutch springs, suspension, washers |
| 5 | Medium Carbon | SAE1045, C45, 40# | 0.5–4.0 | Balance strength / formability | Blades, fasteners, general parts |
| 6 | Low Carbon | SPCC, SPCD, SPCE, DC01–06 | 0.2–3.0 | Excellent formability | Deep drawing, panels, enclosures |
| 7 | Tool Steel Strip | SK5, SK7, T8A, T10A | 0.3–2.0 | Wear resistance, edge hardness | Cutting tools, blades, scrapers |
| 8 | Bearing Steel | GCr15, SUJ2, 100Cr6 | 0.5–3.0 | High hardness, fatigue life | Bearing rings, rollers, needles |
| 9 | Pickled & Oiled | SPHC, Q235, Q345 | 1.5–6.0 | Scale-free surface, weldable | Structural parts, tubes, chassis |
| 10 | Coated Steel | GI, GL, Al-Si, pre-painted | 0.3–3.0 | Corrosion / heat resistance | Appliances, construction, hot stamping |
| 11 | Press Hardening | 22MnB5+AS, 2000MPa grade | 1.0–2.5 | Ultra-high strength after quench | B-pillars, door beams, crash parts |
| 12 | AHSS | HC180YD, HC260LA, DP590 | 0.5–3.0 | High strength + formability | Automotive structure, wheels |
| 13 | Electrical Steel | 50WW470, 50WW600, 35WW250 | 0.20–0.65 | Low core loss, high permeability | Motor cores, transformers, generators |
| 14 | Wire Rod Steel | SWRH62A, SWRH72A, 10B21 | 5.5–16 (rod) | Drawability, cold heading | Wire, fasteners, springs, rope |
Grades and thickness ranges are indicative. Actual availability and specification confirmed at RFQ.
Low-to-medium carbon grades supplied in a fully spheroidized condition for clean, full-shear fine blanking. Controlled hardness and non-metallic inclusion content are critical. Explore fine blanking steel →
Carbon above 0.60%, hardenable to high strength and wear resistance. Supplied spheroidized for blanking or hardened-and-tempered for finished spring and blade properties. High carbon steel strip family → · SAE1078 detail →
Chromium, molybdenum and manganese additions improve hardenability in thicker sections. Used for gears, shafts and components requiring through-hardening and toughness. Alloy structural steel family →
High elastic limit and fatigue resistance. 65Mn for general springs, 50CrV4 for elevated-temperature and high-stress applications. Spring steel strip family → · Compare grades in our spring steel comparison →
C 0.30–0.55%, balancing strength and formability. SAE1045 / C45 is the workhorse for blades, fasteners and machined components that are induction-hardened after forming. Medium carbon steel strip family →
C below 0.10%, maximum ductility for deep drawing and severe forming. SPCE / DC06 for the most demanding draw operations. SPCE detail →
High-carbon, high-toughness grades for cutting edges. SK5 and T8A are common in strip form for utility blades, scrapers and hand tools where edge retention matters. Tool steel strip family →
GCr15 / SUJ2 / 100Cr6 — high-carbon chromium steel with ultra-clean melting for rolling contact fatigue life. Used for bearing rings and precision rolling elements. Bearing & heat-resistant steel family →
Hot-rolled coil with scale removed by acid pickling and a light oil coating for rust prevention. A cost-effective option for structural and tube applications where cold-rolled finish is unnecessary. Hot-rolled pickled coil family →
Zinc (GI), zinc-aluminum (GL) and aluminum-silicon (Al-Si) coatings for corrosion or heat resistance. Al-Si coated 22MnB5 is the standard for hot stamping. Coated steel detail →
22MnB5+AS achieves 1300–1500 MPa tensile strength after austenitizing and die quenching. The material of choice for automotive crash structures. 22MnB5 detail →
Dual-phase (DP), transformation-induced plasticity (TRIP) and high-strength low-alloy (HSLA) grades combining strength with formability for lightweight automotive structures. AHSS family → · HC180YD detail →
Silicon-alloyed steel with controlled core loss and magnetic permeability. Non-oriented grades for motors and generators; grain-oriented for transformers. 50WW470 detail →
Hot-rolled rod in coils, 5.5–16 mm diameter, for wire drawing and cold heading. High-carbon rod for spring wire and rope; low-carbon rod for fasteners and general wire. Wire rod detail →
301 / 304 / 316 chromium-nickel grades with excellent corrosion resistance and cold-work hardening. Used for springs, medical instruments, food equipment and architectural trim. Austenitic stainless family →
Invar, Kovar, Elinvar, Nichrome and other precision alloys with controlled thermal expansion, magnetic permeability or electrical resistance. Used in instrumentation, bimetals, heating elements and electromagnetic devices. Special alloy family →
Grade selection is a five-step process that moves from functional requirement to validated trial. Skipping steps leads to over-specification (higher cost) or under-specification (field failure).
What must the part do? Carry a static or dynamic load? Resist wear? Survive corrosion? Operate at elevated temperature? Each requirement points to a different alloy system.
Fine blanking requires spheroidized material; progressive stamping needs controlled yield and ductility; deep drawing demands low-carbon ultra-ductile grades; hot stamping requires 22MnB5 with Al-Si coating. The process often narrows the grade family before chemistry is considered.
Use the 14-family table above to identify candidates. For example, a hardened clutch plate points to high-carbon or spring steel; a motor stator lamination points to electrical steel; a B-pillar reinforcement points to press-hardening steel.
Within a grade, the delivery condition determines how the material behaves in your process. Spheroidized for blanking, cold-rolled full-hard for spring winding, hardened-and-tempered for finished properties. This is where many buyers go wrong — choosing the right grade but the wrong condition.
Never go straight to production on a new grade or supplier. Order a trial coil, run it on your tooling, measure shear quality, dimensional stability and post-process properties. Trial data becomes the production specification.
| Grade | Family | Typical application | Delivery condition | Indicative hardness |
|---|---|---|---|---|
| SAE1078 | High Carbon | Clutch plates, saw blades | Spheroidized / H&T | 160–200 HB / 38–48 HRC |
| 65Mn | Spring | Clutch disc springs, washers | Spheroidized / cold-rolled | 170–220 HB |
| 50CrV4 | Spring | High-stress suspension springs | Spheroidized / H&T | 180–230 HB / 45–50 HRC |
| SPCE | Low Carbon | Deep-drawn panels, enclosures | Cold-rolled annealed | ≤ 95 HRB |
| SAE1045 | Medium Carbon | Blades, fasteners, shafts | Cold-rolled / spheroidized | 170–210 HB |
| SK5 | Tool Steel | Utility blades, scrapers | Spheroidized / hardened | ≤ 220 HB / 55–60 HRC |
| 50WW470 | Electrical | EV motor stator/rotor cores | Semi-processed / fully processed | — (core loss ≤ 4.70 W/kg) |
| 22MnB5+AS | Press Hardening | B-pillars, door beams | Al-Si coated, as-supplied | ≤ 250 HB (as-quenched 1300–1500 MPa) |
| GCr15 | Bearing | Bearing rings, rollers | Spheroidized annealed | 170–200 HB |
| HC180YD | AHSS | Automotive structure, wheels | Cold-rolled, galvanized | ≥ 180 MPa yield |
Hardness values are indicative ranges. Final hardness is specified per order and confirmed on the MTC. For a detailed walkthrough, see our fine blanking grade selection guide.
Most precision strip orders require at least one secondary operation beyond the base mill product. HS-FINEB offers six core processing services in-house.
Multi-pass rolling to target gauge with controlled thickness tolerance and surface finish. Suitable for gauges from 0.10 mm to 4.0 mm.
Full-cycle annealing to convert lamellar pearlite to spheroidal carbide, maximizing ductility for fine blanking and cold forming. Learn more →
Slitting master coils to custom widths with controlled edge burr; cut-to-length sheets for blanking and laser feed. Width tolerance and burr direction confirmed at quoting.
Multi-roll leveling to control strip flatness and residual stress, critical for progressive die feeding and stacked lamination quality.
Hardening and tempering lines for finished spring and blade properties, with controlled hardness bands and flatness.
Pickling, oiling, bright annealing and coating preparation to match the surface finish your process requires. Surface finish guide →
For a full description of capabilities and equipment, see our processing services overview. Custom processing combinations — for example, spheroidize + slit + level — are standard and quoted as a single delivered product.
Surface finish affects blanking quality, coating adhesion, corrosion resistance and visual appearance. Four finishes are standard for precision strip.
Bright, reflective surface produced by annealing in a protective atmosphere. Used for visible parts, decorative components and applications where a clean, scale-free surface is required. Common on stainless and high-carbon strip.
The standard cold-rolled finish — smooth, matte, slightly reflective. Produced by cold rolling, annealing and pickling (or bright annealing). The most common finish for cold-rolled steel strip used in stamping and forming.
A dull, non-reflective finish with slightly higher surface roughness than 2B. Preferred for paint adhesion and for applications where light reflection is undesirable. Also used where lubricant retention during stamping is beneficial.
Hot-rolled coil with mill scale removed by acid pickling, then coated with a thin rust-preventive oil. A cost-effective surface for structural and tube applications. Not suitable for critical blanking due to residual roughness.
For a detailed comparison of surface finishes, roughness values and selection criteria, read our complete surface finish guide.
Heat treatment transforms the as-rolled microstructure into the condition your process requires. Two routes dominate precision strip supply.
Spheroidizing is a slow-cycle annealing process that converts the lamellar pearlite structure into spheroidal (globular) carbide particles dispersed in a ferrite matrix. The result is maximum ductility and minimum hardness — the ideal condition for fine blanking, cold heading and severe cold forming. For high-carbon grades like SAE1078, proper spheroidization is the difference between a clean shear face and a torn one. Our complete guide to spheroidizing annealing covers cycle parameters, hardness targets and quality control.
For parts that require finished mechanical properties — springs, saw blades, clutch plates — strip is austenitized, quenched (oil or water) and tempered to a target hardness band. This produces a tempered martensite structure with high strength and controlled toughness. Hardness is typically specified as a range (e.g. 42–46 HRC) and verified across the coil width and length. H&T strip must also meet flatness requirements, as quenching introduces residual stress that requires careful tempering and leveling.
Quality assurance for precision strip operates at three levels: mill certification, dimensional inspection and surface verification.
Every coil ships with an MTC issued to EN 10204 3.1 standard. The MTC reports: chemical composition (C, Mn, Si, P, S and alloying elements), mechanical properties (tensile strength, yield strength, elongation, hardness), heat number, coil dimensions (thickness, width, weight) and inspection results. This is your primary incoming-inspection document and provides full traceability from raw heat to finished coil.
Thickness is measured at multiple points across the width using micrometers or continuous gauging. Width is verified after slitting with calipers or laser measurement. Edge quality — burr height and camber — is inspected visually and with feeler gauges. Tolerance compliance is documented on the MTC or a separate inspection report. For guidance on controlling edge burr, see our edge burr prevention guide.
Surface defects — scratches, roll marks, pitting, decarburization — are inspected visually under controlled lighting and, for critical applications, by automated surface inspection systems. Decarburization depth is measured metallographically on high-carbon grades where surface hardness after heat treatment is critical. For electrical steel, surface insulation coating weight and continuity are verified.
Our quality management system is certified to ISO 9001, covering order review, raw material control, process monitoring, final inspection and document control. For automotive programs, additional PPAP documentation can be coordinated — see the seat recliner and door lock application pages for examples.
Precision strip is dense, heavy and moisture-sensitive. Export packaging and logistics planning directly affect whether the material arrives in spec.
Export packaging: Each coil is wrapped in anti-rust (VCI) paper, heat-sealed in plastic film, placed on ISPM-15 compliant wooden or steel pallets, and secured inside the container with steel strapping and dunnage. The packaging is designed for multi-week ocean transit with humidity variation and container condensation.
Container loading: Steel is weight-limited, not volume-limited. Indicative loading capacity is 20–25 tons for a 20GP, 25–28 tons for a 40GP, and 26–28 tons for a 40HQ — actual loading depends on coil weight and packaging dimensions.
Shanghai Port transit: Indicative sea freight times from Shanghai Port range from 5–10 days to Southeast Asia, 15–20 days to the Middle East and US West Coast, 25–35 days to Europe, and 30–40 days to US East Coast. All times are indicative — confirm with your forwarder.
INCOTERMS: We support FOB Shanghai, CIF, CFR and DDP. The right term depends on how much logistics control you want and whether you have a preferred forwarder.
For the complete guide — including the full document checklist (invoice, packing list, B/L, MTC, CO, fumigation certificate) and third-party inspection options (SGS, BV, TÜV) — read our shipping & logistics guide. Trade compliance, HS codes and our privacy policy are covered on the trade compliance page.
From first inquiry to container loading, the ordering process follows seven steps. Understanding each step helps you plan lead time and avoid delays.
Send your grade, thickness, width, quantity, delivery condition and destination port. Include your part drawing or application description so we can recommend the optimal specification.
Our engineers review the specification for feasibility and recommend adjustments if needed. You receive a formal quotation with price, lead time, packaging and INCOTERMS — typically within one working day.
For new grades or new suppliers, order a trial coil (from 1 ton for stocked grades). Validate on your tooling before production commitment.
Issue your PO. We confirm the order in writing with final specification, price, lead time and delivery terms. This is the binding document — verify all details before production starts.
Raw material is allocated, processing (rolling, annealing, slitting) is scheduled, and in-process inspections verify dimensional and mechanical compliance.
Final inspection is performed, MTCs are issued, and the export document set is prepared. Third-party inspection (SGS/BV/TÜV) is arranged at this stage if requested.
Coils are packaged, loaded into the container, and shipped per the agreed INCOTERMS. You receive shipping advice and tracking documents.
For a detailed walkthrough of each step including required documents and typical timelines, see our order process guide. Real-world examples of how this process resolves production challenges are in our anonymized case studies.
HS-FINEB is a Shanghai-based precision steel strip manufacturer and processor, serving customers in automotive, power tools, electrical machinery and general industry across 30+ countries. Our capabilities span precision cold rolling, spheroidizing annealing, slitting, leveling and heat treatment — all under one ISO 9001-certified management system.
We stock 14 grade families from low-carbon deep-drawing to electrical silicon steel and press-hardening 22MnB5, with trial coils available from one ton for stocked grades. Every coil ships with an EN 10204 3.1 MTC, and our engineering team supports material selection and process optimization from RFQ through production.
Whether you are sourcing fine blanking steel for a Tier 1 automotive program, electrical steel for an EV motor platform, or press-hardening steel for body-in-white crash structures, we provide the material specification, processing and documentation your quality system requires.
Send your grade, thickness, width, quantity and application. Our engineers will recommend the optimal delivery condition and provide a quotation within one working day.