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, roughness and oiling on an outer-panel grade
| 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 | — |
On outer panels the surface designation drives the cost more than the grade does: B with a bright or semi-bright roll finish is what a class-A painted panel needs, and it is ordered per coil rather than per lot.
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
Expect around 35 USD/t above the DC01 line: DC05 is an aluminium-killed ultra-low-carbon steel with a non-ageing guarantee, so it is a mill order with its own slot rather than a stock draw. Range below is indicative FOB Istanbul.
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
Export packing of DC05 cold-rolled steel: coil eye-to-sky, VCI paper, edge protection; blanks interleaved on skids. Loading: 20' one coil ≤ 20 t; 40' HC two coils. Tariff heading follows the surface: 7208 hot-rolled, 7209 cold-rolled, 7210 coated, 7225 / 7226 alloy.
| 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
The certificate for DC05 cold-rolled steel is EN 10204 3.1 — analysis, mechanical values and the surface and treatment designations. A 3.2 certificate with SGS, TÜV or BV in attendance is arranged on request. Where the finished profile is CE-marked, the declaration of performance for the coil is issued with the invoice.
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.