S700MC
High-strength steels for cold-forming,
thermomechanically-rolled
Material no. 1.8974 Chemical composition 1) Mechanical properties 1)
according to DIN EN 10149 - 2 (in percent by weight)
Tensile strength class D Nom. thick. e Yield strength R eH
min. max. ≥ 700 MPa
C 0.12 %
General information Si 0.60 % Nom. thick. e Tensile strength Rm
The steel grade is used for cold-formed Mn 2.10 % 750 – 950 MPa
components of the most varied designs. P 0.025 %
Their fields of application include the man- S 0.015 %3) Nom. thick. e Total elongation A 3)
ufacture of : Al 0.015 % < 3 mm ≥ 10 %
– Longitudinal beams Nb 0.09 %2) ≥3 mm ≥ 12 %
– Frames V 0.20 %2)
– Cold-pressed parts Ti 0.22 %2) Temperature Notch impact energy4)
– Cold-rolled sections Mo 0.50 % -20 °C ≥ 27 J
– and Structural pipes B 0.005 %
The user of these steel grades must
1) The tensile test values given in the table apply to
make sure that his calculation, design 1) Heat analysis longitudinal samples.
and processing methods are appropri- 2) The maximum content of Nb+V+Ti shall not 2) In case the thickness is >8 mm, the yield
ate for the material. The forming process exceed 0.220%. strength values may be reduced by 20 N/mm2.
used must be suitable for the intended 3) If agreed in the order, the sulphur content is 3) It applies to nominal thickness e:
0.010% max. e < 3 mm: A80
application and comply with the state-of-
e ≥ 3 mm: A5
the-art; it is of fundamental importance to
the processing behaviour of these steel 4) The average notch impact energy from 3 samples
must be 40 J minimum. One individual value may
grades. fall short of the required minimum value by not
more than 30%. The sample width shall equal the
product thickness if the latter is between 6 and 10
mm. The tests are performed by using samples
similar to Charpy-V samples. The required minimum
values are to be reduced proportionally to the
sample width.
Salzgitter Flachstahl GmbH · Eisenhüttenstraße 99 · 38239 Salzgitter
Phone +49 (0) 5341 21-2890 · Fax +49 (0) 5341 21-8536
E-Mail flachstahl@salzgitter-ag.de · http://www.salzgitter-flachstahl.de
Salzgitter Flachstahl S700MC Page from 2 Edition: 08/11
S700MC
High-strength steels for cold-forming,
thermomechanically-rolled
Heat treatment Available dimensions Welding
Normalised and stress relief annealing Hot-rolled coils unpickled, mill edge These steel grades can be welded both
above 580 °C with long holding times re- manually and using automatic equipment
sults in a reduction of yield strength and Thickness in mm Width in mm by means of all electrical welding process-
tensile strength as compared to the ‘as- 2.00 – 2.99 900 – 1300 es provided the general technical rules are
delivered’ condition which is why such 3.00 – 3.99 900 – 1450 observed. No major hardness increases
heat treatments should be avoided. It also 4.00 – 12.70 900 – 1500 appear in the heat-affected zone. Preheat-
follows that these steel grades are not Thicknesses till 25 mm and under 2,00 mm on ing is not necessary under normal welding
suitable for hot-forming. If low-voltage request. conditions and down to workpiece tem-
Widths till 2000 mm on request.
annealing is necessary to compensate the peratures of +5 °C. Below +5 °C, pre-heat-
welding stresses, the recommended an- ing to 150 °C is recommended.
nealing time between 530 °C and 580 °C Hot-rolled coils pickled, mill edge The welding wires and electrodes ap-
is 30 minutes for all product thicknesses proved in the respective strength category
and steel grades. Thickness in mm Width in mm must be used as filler metals.
2.00 – 2.99 900 – 1300 In addition to this, the general mean-
3.00 – 3.99 900 – 1450 ing of the detailed information provided
4.00 – 12.70 900 – 1500 in ‘Stahl-Eisen-Werkstoffblatt’ (Iron and
Thicknesses under 2 mm and wider widths on steel material sheet) 088 must be ob-
Smallest bending radius request. served.
Trimmed material on request
(Smallest recommended bending radius
bending angles ≥ 90°)
Hot-rolled slit strip Condition of delivery, scope of test-
Nom. thick. e smallest bending radius ing and certificate
≤ 3 mm 1.5 x e Thickness in mm Width in mm The provisions of DIN EN 10149-2, chap-
3 < e ≤ 6 mm 2.0 x e 2.50 – 2.99 100 – 640 ters 7.2 and 8 shall apply for delivery and
> 6 mm 2.5 x e 3.00 – 4.50 100 – 690 inspection. The products are delivered in a
4.51 – 6.00 140 – 740 thermomechanically-rolled condition.
Widths under 100 mm on request.
Thicknesses over 6 mm on request.
Salzgitter Flachstahl GmbH · Eisenhüttenstraße 99 · 38239 Salzgitter
Phone +49 (0) 5341 21-2890 · Fax +49 (0) 5341 21-8536
E-Mail flachstahl@salzgitter-ag.de · http://www.salzgitter-flachstahl.de
Salzgitter Flachstahl S700MC Page from 2 Edition: 08/11
