Steel grades – Mild non-alloy steels for direct cold-forming

Usage

These steel grades are characterized by a yield strength of 170 - 360 MPa and by outstanding formability. They may be used for deep-drawing and forming by bending. The user of these steel grades must make sure that his calculation, design and processing methods are appropriate for the material. The forming technique used must be suitable for the intended application and comply with the state-of-the-art. For particularly complex forming operations, we offer steel grades DD14 Ti (titanium alloyed) and DD14 Bor (boron-alloyed). For further information on DD14 Ti and DD14 Bor, see our Material brochures.

Standards

Europe Material no. DE US FK1)
EN 10111 DIN 1614-2 2) VDA239-100 ASTM/SAE
DD11 1.0332 StW 22 - - / 1010 A
DD12 1.0398 RRStW23 - - / 1008 A
DD13 1.0335 StW 24 - - / - A
DD14 1.0389 - HR2 - / - A
  1. FK = Tensile strength class, see dimensions and executions
  2. invalid standard

Chemical composition in percent by weight [%] (Heat analysis)

Grade C Mn P S
max. max. max. max.
DD111) 0.12 0.60 0.045 0.045
DD121) 0.10 0.45 0.035 0.035
DD131) 0.08 0.40 0.030 0.030
DD141) 0.08 0.35 0.025 0.025
DD14 Ti2) 0.08 0.25 0.025 0.015
DD14 Bor3) 0.08 0,10 - 0,25 0.020 0.020
  1. Unless otherwise agreed in the order, nitrogen-fixing elements such as titanium and boron may be added.
  2. Si max. 0.05 %, Ti max. 0.02 %, Al max. 0.08 %, N max. 0.008 %
  3. B = 0.002 - 0.004 %

Mechanical properties1)

Grade Yield strength2) Tensile stength2) Min. total elongation2) [%]
[MPa] [MPa] L0 = 80 mm L0 = 5,56 √S0
e < 2 2 ≤ e ≤ 113) e < 2 2 ≤ e <3 3 ≤ e ≤ 113)
DD11 170 - 360 170 - 340 max. 440 23 24 28
DD12 170 - 340 170 - 320 max. 420 25 26 30
DD13 170 - 330 170 - 310 max. 400 28 29 33
DD14 170 - 310 170 - 290 max. 380 31 32 36
e < 3,0 3 ≤ e ≤ 83)
transversal longitudinal transversal longitudinal transversal longitudinal transversal longitudinal
DD14 Ti 210 - 300 200 -250 320 - 380 310 - 360 30 - 44 32 - 43 36 - 51 34 - 45
DD14 Bor 170 - 290 150 - 250 290 - 380 280 - 350 ≥ 27 ≥ 30 ≥ 30 ≥ 34
  1. The samples for the tensile test are taken at right angles to rolling direction unless the product width is opposed to this.
  2. e = Nominal thickness in mm
  3. Mechanical values for greater thicknesses on request.

Welding

These steels can be welded using all standard welding methods without pre-heating.

Condition of delivery, scope of testing and certificate

The provisions of EN 10111, shall apply for delivery and inspection.

Certificates according to DIN EN 10204 can be supplied as follows: IT, DUN, FAX, e-mail, paper.