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Resources/Materials & grades/DD11 / SPHC

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

RegionSystemDesignationStandardMatch
USAASTM A1011CS 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/A1011MClosest equivalent
UKBS EN 10111DD11The UK uses the European standard.BS EN 10111Same 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
EUEN 10027-1 nameDD11EN 10111Same material
EN 10027-2 number1.0332EN 10111Same material
DIN 1614 (legacy)StW 22Superseded name for DD11.—Closest equivalent
IndiaIS 1079HR1Commercial quality. Tensile maximum 440 MPa and elongation minimum 23 % match DD11 as published by Tata Steel; chemistry and yield limits differ in detail.IS 1079:2017Closest equivalent
JapanJIS G 3131SPHCCommercial quality. Adds a 270 MPa minimum tensile strength that EN 10111 does not set, and allows slightly higher phosphorus and sulphur.JIS G 3131Closest 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 %

ElementCS Type B (heat analysis)USA · ASTM A1011/A1011MDD11 (1.0332)EU · EN 10111SPHCJapan · 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

ConditionTensile strengthYield strengthElongationHardness
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 ksi170–360 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 ksi170–340 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 ksi170–340 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.

Typical uses

  • 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

GradeC %Mn %Cr %Ni %Tensile, first listed condition
DD11 / SPHC≤0.15≤0.60≤0.15≤0.20≤440 MPa
DD12 / SPHD0.02–0.08≤0.45——≤420 MPa
DD13 / SPHE≤0.08≤0.40——≤400 MPa
S355MC≤0.23≤1.35≤0.15≤0.20430–550 MPa
DC01 / SPCC0.02–0.15≤0.60≤0.15≤0.20270–410 MPa
DC03 / SPCD0.02–0.08≤0.50≤0.15≤0.20270–370 MPa
DC04 / SPCE≤0.06≤0.50≤0.15≤0.20270–350 MPa
DC05 / SPCF≤0.02≤0.40≤0.15≤0.10270–330 MPa
DC06 / SPCG≤0.02≤0.40≤0.15≤0.10270–330 MPa
DX51D / 1.02260.02–0.15≤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.

Questions answered

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

Hot-rolled flat

HR Coils

Thickness: 0.063-0.236 in / 1.6-6 mm · Width: 36-80 in / 900-2,050 mm

Specifications
Hot-rolled flat

HR Sheets

Thickness: 0.063-1 in / 1.6-25 mm · Sheet size: 48 x 96, 48 x 120, 60 x 120 in / 1,250 x 2,500, 1,250 x 6,300, 1,500 x 6,300 mm

Specifications
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Keep reading

DD12 / SPHDDD12 (1.0398) is the drawing-quality grade of EN 10111, a hot-rolled low-carbon strip with lower carbon and more elongation than DD11.DD13 / SPHEDD13 (1.0335) is the deep-drawing grade of EN 10111, a hot-rolled low-carbon strip with the highest elongation below DD14.S355MCS355MC (1.0976) is a thermomechanically rolled high-strength steel strip to EN 10149-2 with a minimum yield of 355 MPa, made for cold forming and bending.DC01 / SPCCDC01 (1.0330) is the commercial-quality cold-rolled low-carbon steel sheet of EN 10130, used for bending, profiling and light forming.1008SAE 1008 is a very low-carbon steel with at most 0.10 % carbon, supplied as sheet, strip, wire and bar for deep drawing and cold forming.1010 / C10E1010 is a low-carbon steel with about 0.10 % carbon, supplied as bar, wire and sheet for cold-formed, carburized and welded parts.EN 10027 names and numbersEuropean steels carry two identifiers under EN 10027: a steel name (Part 1) such as S235JR, C45 or 42CrMo4 that describes the steel's use or chemistry, and a material number (Part 2) such as 1.0503 or 1.7225.JIS steel designationsJapanese JIS steel symbols start with S for steel and add letters for the steel family or its use, but the number means different things in different standards.

References

Sources

  1. Nippon Steel Slovakia: EN 10111 drawing steels DD11 to DD14 — Yield, tensile and elongation by thickness band; heat-analysis C, Mn, P, S.
  2. 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.
  3. Arvedi: steels for cold deformation as per EN 10111 — Material numbers 1.0332, 1.0398, 1.0335, 1.0389; composition limits.
  4. 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).
  5. Moris: DD11 steel grade — Lists DIN StW22 and a UK HR2 designation against DD11.
  6. 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.
  7. Tata Steel DigECA: Tata Astrum IS 1079 HR1 — Tensile maximum 440 MPa, elongation minimum 23 %.
  8. Tata Steel DigECA: steel grade chart India — IS 1079 HR1 to HR4 described as commercial, drawing, deep drawing and extra deep drawing quality.
  9. 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.
  10. SSAB: ASTM A1011 CS Type B — CS Type B heat-analysis limits; chemistry only, no mechanical requirements.
  11. 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.
  12. 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.