What is DC05 cold-rolled steel?
DC05 tightens every DC04 requirement: carbon 0.06 % max (typically 0.02), manganese 0.35 %, phosphorus and sulphur 0.025 %, yield capped at 180 MPa, elongation 40 % and — the decisive figures — r90 ≥ 1.9 and n90 ≥ 0.20. The higher r-value comes from a more strongly developed {111} annealing texture, obtained with an ultra-low-carbon, aluminium-killed heat and a long batch anneal or a controlled continuous anneal. In the die, that texture means the flange feeds inward freely while the cup wall keeps its thickness, so draw ratios of 2.1–2.3 and deep second-stage draws succeed without the necking that limits DC04. DC05 is the working grade of automotive outer skins (doors, bonnets, wings), wheel-house and floor-pan pressings, fuel-tank halves and any complex multi-stage part; it is also chosen for enamelled deep-drawn ware where a defect-free wall matters. It is non-ageing without time limit in practice. DC06 goes one step further with interstitial-free steel.
Chemical composition
| Element | C | Mn | P | S |
|---|---|---|---|---|
| max. % (ladle) | 0.06 | 0.35 | 0.025 | 0.025 |
Typical heat: C 0.015–0.025, Mn 0.10–0.20, Al 0.04–0.07.
Mechanical properties and deep-drawing indices
| Property | Requirement | Typical value | Note |
|---|---|---|---|
| Yield strength Rp0.2 | ≤ 180 MPa | 130–170 MPa | |
| Tensile strength Rm | 270–330 MPa | 280–310 MPa | |
| Elongation A80 | ≥ 40 % | 42–48 % | |
| r90 | ≥ 1.9 | 2.0–2.3 | guaranteed |
| n90 | ≥ 0.20 | 0.21–0.24 | guaranteed |
| Ageing | non-ageing | guaranteed |
Equivalent grades
| System | Grade | Note |
|---|---|---|
| DIN 1623 (old) | St 15 | historic German |
| EN 10130 (1991) | Fe P05 | previous edition |
| JIS G3141 | SPCF | |
| ASTM A1008 | EDDS | |
| GB/T 5213 | DC05 |
Surface finish, roughness and oiling
| Code | Meaning | Ra (µm) | Typical use |
|---|---|---|---|
| A | normal surface — minor defects (pores, scratches, slight marks) allowed | — | general fabrication, hidden parts |
| B | best surface — the better side free of defects that impair a uniform paint finish | — | visible painted or plated parts |
| b (bright) | smooth roll finish | ≤ 0.4 | chrome plating, decorative |
| g (semi-bright) | standard finish | 0.4–0.9 (typ. 0.6–1.9) | painting, powder coating |
| m (matt) | shot-blasted rolls | 0.6–1.9 | deep drawing, paint adhesion |
| r (rough) | heavy texture | > 1.6 | special |
| oiling | light rust-preventive oil both sides (standard); dry or heavy oil on request | — |
Order example: plain cold-rolled is ordered as "DC01 A m, oiled". Turkish name DKP (dekape = pickled) refers to the pickled substrate of all cold-rolled sheet.
Thickness range and stock sizes
| Thickness | Widths × lengths | Availability |
|---|---|---|
| 0.50–1.0 mm | coil 1 000 / 1 250 / 1 500 mm; blanks | to order 3–5 weeks |
| 1.2–2.5 mm | coil 1 250 / 1 500 mm | to order 3–5 weeks |
Weight per m² and per sheet
| Thickness | kg/m² | 1 000 × 2 000 (kg) | 1 250 × 2 500 (kg) | 1 500 × 3 000 (kg) |
|---|---|---|---|---|
| 0.5 mm | 3.93 | 7.9 | 12.3 | 17.7 |
| 0.6 mm | 4.71 | 9.4 | 14.7 | 21.2 |
| 0.7 mm | 5.50 | 11.0 | 17.2 | 24.7 |
| 0.8 mm | 6.28 | 12.6 | 19.6 | 28.3 |
| 1 mm | 7.85 | 15.7 | 24.5 | 35.3 |
| 1.2 mm | 9.42 | 18.8 | 29.4 | 42.4 |
| 1.5 mm | 11.78 | 23.6 | 36.8 | 53.0 |
| 2 mm | 15.70 | 31.4 | 49.1 | 70.7 |
| 2.5 mm | 19.63 | 39.3 | 61.3 | 88.3 |
Uncoated; tolerances to EN 10131.
Forming, welding and painting
Draw ratios above 2.1, multi-stage draws and stretch-forming of large panels; low blank-holder force, polished or coated tools, drawing oil. The soft surface marks easily — handle with paper interleaving and clean dies. Spot and laser welding routine; MAG on thicker gauges. Painting and e-coat after phosphating; enamelling on the matt finish.
Where it is used
- Automotive outer panels: doors, bonnets, wings, roofs
- Wheel-houses, floor pans and complex inner panels
- Fuel-tank halves and pressure-less vessel shells
- Multi-stage drawn cylinders, cups and cans
- Enamelled deep-drawn ware (bath tubs, appliance tubs)
- Heat-exchanger and radiator pressings
DC05 vs DC04 vs DC06
DC04 (r ≥ 1.6) from stock handles most industrial drawing; DC05 (r ≥ 1.9) is the automotive outer-panel and multi-stage grade; DC06 (r ≥ 2.1, IF steel) is for the deepest and most complex parts and for total freedom from ageing. Price steps are about 15 USD/t each.
Price
DC05 is priced about 35 USD/t over DC01; the band below is indicative FOB Istanbul for mill-order coil.
Bands from our weekly export list (September 2026), FOB Istanbul, full-container quantities, excluding freight and certificates. Firm price per project on RFQ within one working day.
Export and packing
DC05 cold-rolled steel ships as coil — eye-to-sky on a wooden cradle, 5–25 t per coil, VCI paper and steel strapping — or as cut sheet on skids of 2–3 t with paper interleaving and edge protectors. A 20' takes one coil up to 20 t; a 40' HC two coils or 24 t of sheet. HS 7210 / 7209 / 7208 by product.
| Term | Detail |
|---|---|
| MOQ | One coil (10–20 t) |
| Incoterms | FOB Istanbul · CIF / CFR Gulf, Africa · DAP EU, Balkans, Iraq, Caucasus · DAP Aktau |
| Lead time | To order 3–5 weeks |
| Packing | Coil eye-to-sky, VCI paper, edge protection; blanks interleaved on skids |
| Container / truck | 20' one coil ≤ 20 t; 40' HC two coils |
| Documents | Invoice, packing list, EN 10204 3.1 (3.2 on request), certificate of origin; SASO / SONCAP / PVoC on request |
| Payment | 30% advance, balance against B/L copy; L/C at sight for orders above 100 t |
Certificates and testing
DC05 cold-rolled steel ships with EN 10204 3.1 certificates cross-referenced to the stencilled heat numbers. Where the project requires it we arrange 3.2 certification with Lloyd's, BV, TÜV or SGS, ultrasonic examination to EN 10160 and Charpy testing at the temperature you specify.
How to order
Specify thickness × width or blank size, surface B / finish m, oiling, r/n certification, the part drawing if available and tonnage; mill slot confirmed within one working day.
Standards
- EN 10130:2006 — DC05, 1.0312
- EN 10131 — tolerances
- EN 10204 3.1
- Former DIN 1623 St 15 / EN 10130 Fe P05
Grades
Grade data sheets (chemistry, mechanicals, equivalents) are on our reference site: DC05 · DC04 · DC06
Frequently asked questions
What is DC05 steel?
The extra-deep-drawing cold-rolled sheet of EN 10130 (1.0312, ex St 15): yield ≤ 180 MPa, elongation ≥ 40 %, guaranteed r90 ≥ 1.9 and n90 ≥ 0.20, non-ageing — for automotive panels and multi-stage draws.
What is the difference between DC04 and DC05?
DC05 has a lower yield ceiling (180 vs 210 MPa), higher elongation (40 vs 38 %) and higher guaranteed drawing indices (r ≥ 1.9 vs 1.6); it allows draw ratios above 2.1.
What is the equivalent of DC05?
DIN St 15, JIS SPCF, ASTM A1008 EDDS.