Materials & grades
DD11 / 1.0332 hot-rolled steel sheet and strip (EN 10111, close to ASTM A1011 CS, IS 1079 HR1, JIS SPHC)
DD11 (1.0332) is the commercial-quality grade of EN 10111, a low-carbon hot-rolled strip made for cold forming. Its nearest equivalents are ASTM A1011 CS Type B, IS 1079 HR1 and JIS G 3131 SPHC, but none of them is identical.
Names by standard
What it is called in each region
| Region | System | Designation | Norma | Match |
|---|---|---|---|---|
| USA | ASTM A1011 | CS Type BCommercial steel with a chemistry-only requirement (no tension test), so it is the nearest US counterpart rather than a match. CS Type B allows up to 0.15 % C and 0.60 % Mn. | ASTM A1011/A1011M | Closest equivalent |
| UK | BS EN 10111 | DD11The UK uses the European standard. | BS EN 10111 | Same material |
| BS 1449-1.1 (legacy) | HR1 / HR2Withdrawn. Moris pairs DD11 with HR2, while Indian and ISO practice uses HR1 for commercial quality; check the mill certificate if a drawing calls up a BS 1449 grade. | — | Closest equivalent | |
| EU | EN 10027-1 name | DD11 | EN 10111 | Same material |
| EN 10027-2 number | 1.0332 | EN 10111 | Same material | |
| DIN 1614 (legacy) | StW 22Superseded name for DD11. | — | Closest equivalent | |
| Indie | IS 1079 | HR1Commercial quality. Tensile maximum 440 MPa and elongation minimum 23 % match DD11 as published by Tata Steel; chemistry and yield limits differ in detail. | IS 1079:2017 | Closest equivalent |
| Japan | JIS G 3131 | SPHCCommercial quality. Adds a 270 MPa minimum tensile strength that EN 10111 does not set, and allows slightly higher phosphorus and sulphur. | JIS G 3131 | Closest equivalent |
On equivalence
- No equivalent is identical. DD11, ASTM A1011 CS Type B, IS 1079 HR1 and JIS SPHC all describe low-carbon commercial-quality hot-rolled sheet, but their limits are set differently.
- EN 10111 sets maximum yield and tensile strength; JIS G 3131 sets a 270 MPa minimum tensile strength; ASTM A1011 CS sets chemistry only. Do not substitute one for another where a mechanical limit is on the drawing.
- ASTM A1011 has no tension-test requirement for CS Type B, so the figures shown for it are chemistry limits, not mechanical guarantees.
- Sources disagree on the legacy UK name: Moris pairs DD11 with BS 1449 HR2, while other references pair BS 1449 HR1 with commercial quality. Treat the BS 1449 names as closest only.
- The IS 1079 grade tables could be read for tensile maximum and elongation only (from Tata Steel); the composition limits for HR1 were not found in a source we could verify.
Chemical composition
Composition limits, mass %
| Element | CS Type B (heat analysis)USA · ASTM A1011/A1011M | DD11 (1.0332)EU · EN 10111 | SPHCJapan · JIS G 3131 (as tabulated for SPHC) |
|---|---|---|---|
| C | ≤0.15 | ≤0.12 | ≤0.15 |
| Mn | ≤0.60 | ≤0.60 | ≤0.60 |
| P | ≤0.030 | ≤0.045 | ≤0.050 |
| S | ≤0.035 | ≤0.045 | ≤0.050 |
| Cr | ≤0.15 | — | — |
| Ni | ≤0.20 | — | — |
| Mo | ≤0.06 | — | — |
| V | ≤0.008 | — | — |
| Cu | ≤0.20 | — | — |
| Ti | ≤0.025 (higher where C ≥0.02 %, up to 3.4N + 1.5S) | — | — |
| Nb | ≤0.008 | — | — |
Mechanical properties
Strength and hardness
| Condition | Tensile strength | Yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Hot rolled (EN 10111 DD11)Specified, thickness under 2 mm; yield is ReH or Rp0.2 as a range; elongation A80 (80 mm gauge)EN 10111 as tabulated by Nippon Steel Slovakia and ArcelorMittal | ≤440 MPa≤63.8 ksi | 170–360 MPa24.7–52.2 ksi | ≥23 % | — |
| Hot rolled (EN 10111 DD11)Specified, thickness 2 to under 3 mm; elongation A80EN 10111 as tabulated by Nippon Steel Slovakia and ArcelorMittal | ≤440 MPa≤63.8 ksi | 170–340 MPa24.7–49.3 ksi | ≥24 % | — |
| Hot rolled (EN 10111 DD11)Specified, thickness 3 to 11 mm; elongation A (5.65√S0 gauge)EN 10111 as tabulated by Nippon Steel Slovakia and ArcelorMittal | ≤440 MPa≤63.8 ksi | 170–340 MPa24.7–49.3 ksi | ≥28 % | — |
| Hot rolled (IS 1079 HR1)Specified; tensile maximum and elongation minimum as published by Tata Steel; no yield limit shown; ordering range 1.6 to 8 mmIS 1079 as published by Tata Steel (Astrum HR1) | ≤440 MPa≤63.8 ksi | — | ≥23 % | — |
| Hot rolled (JIS G 3131 SPHC)Specified; tensile is a minimum; elongation 27 % at 1.2 to under 1.6 mm, 29 % at 1.6 to under 3.2 mm, 31 % at 3.2 mm and overJIS G 3131 grade table as tabulated by Krakatau POSCO and BEBON Steel | ≥270 MPa≥39.2 ksi | — | 27–31 % | — |
| Supplied to ASTM A1011 CS Type BNo tension-test requirement: the grade is ordered to chemistry only, so yield, tensile and elongation are not specified or guaranteed by the standardASTM A1011/A1011M as described by SSAB | — | — | — | — |
In practice
Behaviour, heat treatment and uses
Characteristics
- Low carbon (≤0.12 %) and low alloy, so it forms, bends and welds readily with common processes; no preheat is normally needed in thin gauges.
- The lowest-formability grade of the DD11 to DD14 series: higher grades (DD12, DD13, DD14) trade strength for elongation.
- EN 10111 limits yield and tensile strength from above (maximums) so the steel stays soft enough to form; it is not a minimum-strength structural grade.
- Aluminium, silicon and carbon-equivalent limits are not set for DD grades in EN 10111, so weldability rests on the low carbon and manganese.
- Not intended for load-bearing structures where a guaranteed minimum yield is required; use S235JR or S355MC style grades there.
Heat treatment
- Supplied hot rolled from the coil; no heat treatment is applied or needed for forming.
- Not hardened: the carbon is too low to respond to quenching, and it is not case-hardened in normal practice.
- Stress relief or normalizing after heavy cold forming is possible but rarely specified; confirm with the forming drawing.
- Pickling and oiling (to remove scale) and hot-dip galvanizing are applied after forming or at the coil stage by agreement.
Typické použití
- Pressed and formed automotive and truck chassis parts, brackets and cross-members
- Pipe and tube blanks, drums, cylinders and tanks
- Profiled sections, shelving, racks and storage systems
- General sheet-metal fabrications, covers and housings
- Blanks for cold forming, stamping and roll forming
Sheet and strip
Similar grades compared
| Jakost | C % | Mn % | Cr % | Ni % | Tensile, first listed condition |
|---|---|---|---|---|---|
| DD11 / SPHC | ≤0.15 | ≤0.60 | ≤0.15 | ≤0.20 | ≤440 MPa |
| DD12 / SPHD | 0.02–0.08 | ≤0.45 | — | — | ≤420 MPa |
| DD13 / SPHE | ≤0.08 | ≤0.40 | — | — | ≤400 MPa |
| S355MC | ≤0.23 | ≤1.35 | ≤0.15 | ≤0.20 | 430–550 MPa |
| DC01 / SPCC | 0.02–0.15 | ≤0.60 | ≤0.15 | ≤0.20 | 270–410 MPa |
| DC03 / SPCD | 0.02–0.08 | ≤0.50 | ≤0.15 | ≤0.20 | 270–370 MPa |
| DC04 / SPCE | ≤0.06 | ≤0.50 | ≤0.15 | ≤0.20 | 270–350 MPa |
| DC05 / SPCF | ≤0.02 | ≤0.40 | ≤0.15 | ≤0.10 | 270–330 MPa |
| DC06 / SPCG | ≤0.02 | ≤0.40 | ≤0.15 | ≤0.10 | 270–330 MPa |
| DX51D / 1.0226 | 0.02–0.15 | ≤0.60 | — | — | 270–500 MPa |
Composition from the US standard where one exists, otherwise the first standard listed on each grade's page. Strength conditions differ between grades; open a grade for its full table.
Odpovědi na Vaše otázky
Common questions
What is the equivalent of DD11 steel?
The closest equivalents are ASTM A1011 CS Type B, IS 1079 HR1 and JIS G 3131 SPHC. All are commercial-quality low-carbon hot-rolled sheet, but none matches EN 10111 exactly: the limits on strength, chemistry and testing differ.
Is DD11 the same as SPHC?
They serve the same purpose but are different specifications. SPHC requires a minimum tensile strength of 270 MPa and allows up to 0.050 % phosphorus and sulphur; DD11 limits yield and tensile strength from above and allows 0.045 % at most.
What are the DD11 yield and tensile strength?
EN 10111 gives DD11 a yield range of 170–360 MPa under 2 mm and 170–340 MPa from 2 to 11 mm, with tensile strength up to 440 MPa. These are limits, not typical values: actual coils fall inside them.
What is the difference between DD11, DD12, DD13 and DD14?
The number sets the forming quality. DD11 is commercial quality; DD12 and DD13 have lower carbon and manganese and higher elongation; DD14 is the most formable. Maximum tensile strength falls from 440 MPa (DD11) to 380 MPa (DD14).
Is DD11 weldable?
Yes. With at most 0.12 % carbon and 0.60 % manganese it welds readily by MIG, TIG and resistance processes. Weld procedures usually need no preheat in thin gauges.
From the Corona catalog
Products listed with DD11 / SPHC
Svitky válcované za tepla
Tloušťka: 0,063–0,236 in / 1,6–6 mm · Šířka: 36–80 in / 900–2 050 mm
Technické parametry
Plechy válcované za tepla
Tloušťka: 0,063–1 in / 1,6–25 mm · Formát tabule: 48 × 96, 48 × 120, 60 × 120 in / 1 250 × 2 500, 1 250 × 6 300, 1 500 × 6 300 mm
Technické parametryKeep reading
Related references
References
Sources
- Nippon Steel Slovakia: EN 10111 drawing steels DD11 to DD14 — Yield, tensile and elongation by thickness band; heat-analysis C, Mn, P, S.
- ArcelorMittal Industry catalogue: EN 10111 hot-rolled grades — Yield, tensile, A80 and A5.65 by thickness; no Si, Al or CEV limit for DD grades.
- Arvedi: steels for cold deformation as per EN 10111 — Material numbers 1.0332, 1.0398, 1.0335, 1.0389; composition limits.
- DIN Media: EN 10111 Continuously hot rolled low carbon steel sheet and strip for cold forming — Scope and title of the standard (thickness up to 11 mm).
- Moris: DD11 steel grade — Lists DIN StW22 and a UK HR2 designation against DD11.
- Krakatau POSCO: hot-rolled coil specification table (MS 1705, JIS grade names SPHC, SPHD, SPHE) — Composition, tensile minimum and elongation by thickness for SPHC, SPHD and SPHE as tabulated for the Malaysian standard that uses the JIS grade names.
- Tata Steel DigECA: Tata Astrum IS 1079 HR1 — Tensile maximum 440 MPa, elongation minimum 23 %.
- Tata Steel DigECA: steel grade chart India — IS 1079 HR1 to HR4 described as commercial, drawing, deep drawing and extra deep drawing quality.
- ASTM A1011/A1011M: hot-rolled carbon, structural, HSLA and UHSS sheet and strip (abstract) — Scope: CS, DS, SS, HSLAS, HSLAS-F and UHSS designations; the standard text is paywalled.
- SSAB: ASTM A1011 CS Type B — CS Type B heat-analysis limits; chemistry only, no mechanical requirements.
- BEBON Steel: JIS G 3131 SPHC and SPHD — SPHC and SPHD C, Mn, P, S limits; 270 MPa minimum tensile; SPHC elongation 27/29/29/29/31/31 % by thickness band from 1.2 mm.
- thyssenkrupp Steel: product information deep-drawing steels DD, DC and DX — EN 10111 DD11 to DD14 composition, yield, tensile and elongation.
Values summarize published limits and typical data. The governing standard and the current edition control; check them before specifying.