DD11 steel (1.0332): properties, composition, equivalents
DD11 (1.0332, ex StW22) is the hot-rolled forming sheet of EN 10111: 170–360 MPa yield, ≤ 440 MPa tensile, 23–28 % elongation. Composition, thickness table, pickled (+P) variants and SPHC/HR1/CS equivalents.
What is DD11?
DD11 is the hot-rolled counterpart of DC01: a low-carbon sheet and coil steel specified in EN 10111 for cold forming, Werkstoff number 1.0332, formerly StW22. Where DC01 covers 0.4–3 mm cold-rolled, DD11 covers roughly 1.5–12 mm hot-rolled — the thickness band of wheel rims, agricultural panels, automotive chassis brackets, pressed pipe fittings, drums and gas cylinders.
EN 10111 guarantees a yield window of 170–360 MPa, tensile ≤ 440 MPa and 23–28 % elongation depending on thickness, with carbon ≤ 0.12 % and Mn ≤ 0.60 %. The wide yield range and absence of r/n values mark DD11 as a bending and general pressing grade; DD12, DD13 and DD14 are the drawing, deep-drawing and extra-deep-drawing steps. Most DD11 is sold pickled and oiled (DD11+P) for a scale-free surface.
Buyers often confuse DD11 with S235JR because the chemistry overlaps: the difference is what is guaranteed. S235JR promises a minimum yield and impact toughness for structures; DD11 promises a yield window and ductility for forming. JIS SPHC, BS HR1 and IS 1079 D are the same class; ASTM A1011 CS Type B is the nearest US grade.
DD11 chemical composition
| Element | Mass % | Note |
|---|---|---|
| C | ≤ 0.12 | |
| Mn | ≤ 0.6 | |
| P | ≤ 0.045 | |
| S | ≤ 0.045 |
EN 10111:2008 Table 2, ladle analysis. DD12–DD14 progressively tighten C (0.10, 0.08, 0.08), Mn (0.45, 0.35, 0.35), P and S. Typical DD11 coil: C 0.04–0.08, Mn 0.20–0.40, Al-killed.
DD11 mechanical properties
| Thickness / condition | Yield strength ReH / Rp0.2 MPa (ksi) | Tensile strength Rm MPa (ksi) | Elongation A % | Hardness |
|---|---|---|---|---|
| t < 2 mm (transverse) | 170–360 (24.7–52.2) | ≤ 440 (≤ 63.8) | 23 | ≈ 55–85 HRB (typ.) |
| 2 ≤ t < 3 mm | 170–360 (24.7–52.2) | ≤ 440 (≤ 63.8) | 24 | — |
| 3 ≤ t < 5 mm | 170–360 (24.7–52.2) | ≤ 440 (≤ 63.8) | 27 | — |
| 5 ≤ t ≤ 11 mm | 170–360 (24.7–52.2) | ≤ 440 (≤ 63.8) | 28 | — |
| DD12 (for comparison) | 170–340 (24.7–49.3) | ≤ 420 (≤ 60.9) | 25–30 | — |
| DD13 | 170–330 (24.7–47.9) | ≤ 400 (≤ 58.0) | 28–33 | — |
| DD14 | 170–310 (24.7–45.0) | ≤ 380 (≤ 55.1) | 31–36 | — |
EN 10111 Table 3; A80 for t < 3 mm, A (L0 = 5.65√S0) for t ≥ 3 mm. Yield upper limit for DD11 applies only within one month of manufacture (ageing). No r/n guarantee for DD11.
DD11 equivalent grades
| Grade | System | Match | Why / differences |
|---|---|---|---|
| HR1 | BS (superseded British) | Identical | BS 1449-1 HR1 (commercial hot-rolled). |
| IS 1079 D | IS (India) | Identical | IS 1079 grade D (drawing) / O (ordinary); D is the DD11 match. |
| SPHC | JIS (Japan) | Identical | JIS G3131 SPHC: C ≤ 0.15, Mn ≤ 0.60, Rm ≥ 270 MPa, A ≥ 27–31 % by thickness. Commercial hot-rolled forming sheet — SPHD ≈ DD12, SPHE ≈ DD13. |
| CS Type B (A1011) | ASTM / ASME | Near | ASTM A1011 Commercial Steel Type B hot-rolled: C ≤ 0.02–0.15, Mn ≤ 0.60, no guaranteed mechanicals. DS (Drawing Steel) Type B corresponds to DD12/DD13. |
| DD12 | EN (European) | Near | Drawing quality with tighter chemistry and higher elongation. |
| Q195 / SPHC | GB/T (China) | Near | GB/T 5213 hot-rolled uses DD11-type names in newer editions; older specs use Q195 (yield ≥ 195 MPa) or 08Al. |
| 08kp / 08ps hot-rolled | GOST (Russia/CIS) | Near | GOST 16523 group KhP (cold-forming quality) on 08kp/08ps base. |
| St37-2 | DIN (superseded German) | Functional | Hot-rolled forming sheet often bought 'as St37' in Turkey/Middle East — but it has no guaranteed minimum yield. |
| DD13 | EN (European) | Functional | Deep-drawing quality (A ≥ 28–33 %) for demanding pressings. |
| S235JR | EN (European) | Functional | Structural steel of similar chemistry with guaranteed 235 MPa yield and impact; DD11 has no minimum yield guarantee for structural design. |
Identical = same composition and mechanical limits within rounding. Near = one limit differs (e.g. carbon max or impact temperature). Functional = interchangeable for most uses after an engineering check. Full cross-reference for DD11 →
Old and superseded designations
| Old name | Standard | Note |
|---|---|---|
| StW22 | DIN 1614-1 (withdrawn) | Still the common German/Turkish shop name; StW23 = DD12, StW24 = DD13. |
| FeP11 | EN 10111:1991 | Renamed DD11 in 1998. |
| HR1 / HR2 | BS 1449-1 | HR1 is the nearer match. |
| 1C | NF A 36-301 |
Product forms and tolerance standards
Product forms: hot-rolled coil and sheet 1.5–12 mm (typically 1.5–6 mm), pickled and oiled (DD11+P or 'P&O'), slit strip, cut lengths, narrow strip (EN 10111 applies to width ≥ 600 mm; narrow strip to EN 10139).
Dimensional tolerances: thickness/width/flatness: EN 10051 (normal or special); surface: as-rolled (mill scale) or pickled; surface quality per EN 10163-2 (class A/B, subclass 1–3) for plate-type products.
Key property values
DD11 yield strength
170–360 MPa (25–52 ksi) transverse; the upper limit is only guaranteed for one month after rolling. Typical coil: 220–300 MPa.
DD11 tensile strength
≤ 440 MPa (64 ksi max, no minimum); typical 320–400 MPa.
DD11 elongation
≥ 23 % below 2 mm rising to ≥ 28 % at 5–11 mm (A80 below 3 mm, A above).
DD11 hardness
Not specified; typically 55–85 HRB (≈ 100–150 HV) as rolled.
Physical properties
Density 7.85 g/cm³, E = 210 GPa. Thickness 1.5–12 mm (mill-dependent; EN 10111 covers up to 11 mm for the elongation table), width 600–2000 mm.
Weldability
Excellent weldability by all arc and resistance processes without preheat (CEV ≈ 0.15–0.25). Pickled DD11+P welds cleaner than scaled material. Use E38/G38 consumables; no PWHT.
Machining, forming and heat treatment
Bending to 0.5–1 t inside radius transverse to rolling direction is normal; punching, shearing, laser and plasma cutting are routine (pickled surface improves laser consistency). Moderate stretch forming and shallow drawing are fine; for deep draws in hot-rolled gauge use DD13 or DD14. Machinability of the low-carbon matrix is good but gummy (index ≈ 70 %). Hot-dip galvanizing after fabrication: good, but check Si + 2.5 P ≤ 0.09 % (Sandelin range) if a bright coating is required.
Typical applications
- Wheel rims and disc blanks (as DD11–DD13)
- Automotive chassis brackets, cross-members, seat frames
- Pressed pipe fittings, flanges and end caps
- Gas cylinders (as DD11/DD12 or P245NB for pressure)
- Agricultural implements, guards and panels
- Steel drums, containers and heavy enclosures
- Cold-formed profiles and general sheet-metal fabrication 2–6 mm
DD11 compared with related grades
Frequently asked questions
What is the difference between DD11 and S235JR?
Both are low-carbon hot-rolled steels, but DD11 (EN 10111) is a forming grade with a yield window of 170–360 MPa and no impact guarantee, while S235JR (EN 10025-2) is a structural grade with a guaranteed 235 MPa minimum yield and 27 J at +20 °C. Use S235JR for load-bearing design; DD11 for pressed and bent parts.
Is DD11 the same as StW22?
Yes. StW22 (DIN 1614) became FeP11 (EN 10111:1991) and then DD11 (EN 10111:1998). Same steel and use.
What is DD11+P?
DD11 supplied pickled (mill scale removed in acid) and lightly oiled — the usual condition for laser cutting, welding and painting without descaling.
What is the JIS equivalent of DD11?
SPHC (JIS G3131) is the commercial hot-rolled forming sheet equivalent to DD11; SPHD ≈ DD12 and SPHE ≈ DD13.
Can DD11 be galvanized?
Yes, both by continuous hot-dip (then it is designated DX51D/DX52D with a hot-rolled substrate) and by batch galvanizing after fabrication. Ask the mill for Si and P control if a smooth, bright zinc layer matters.
Related grades
Verified against EN 10111:2008; EN 10111:2008 Tables 2 and 3; EN 10051:2010 (tolerances). Last checked: September 2026.