Thermomechanically rolled steels with excellent cold formability of stamped edges

The steel grades combined in the alform® MU series are microalloyed, thermomechanically rolled and characterized by excellent cold formability of stamped edges. For the alform® MU steels, mechanical-technological properties are guaranteed within narrower limits than for comparable steels pursuant to EN10149-2.

alform-MU-Reihe

The alform® MU steels have low carbon contents and thus exhibit very good weldability. The optimized production route leads to a good limitation of non metallic inclusions and a fine-grained, homogeneous microstructure. The alform® MU steels have their advantages in particularly challenging forming operations. A good combination of cold formability and damage tolerance on stamped edges ensures increased production reliability. Improved notched bar impact energy is also achieved when compared to conventional microalloyed steels.

alform® is now available as a greentec steel in proven quality with a reduced carbon footprint.

Chemical composition 

Ladle analysis in weight percent and carbon equivalent

alform® C
max.
Si
max.
Mn
max.
P
max.
S
max.
Al
max.
Cr
max.
Ni
max.
Mo
max.
Cu
max.
V
max.
NB
max.
Ti
max.
B
max.
CEV
max.
355 MU 1)
0,100,101,200,0180,0050,0200,30,30,080,30,050,050,050,0030,28
380 MU 1)
0,100,101,200,0200,0050,0200,30,30,080,30,050,050,050,0030,30
420 MU 1)
0,100,101,400,0200,0050,0200,30,30,080,30,050,050,050,0030,34
460 MU 1) 2)
0,100,101,500,0200,0050,0200,30,30,080,30,070,070,070,0030,36
500 MU 1)
0,100,101,600,0200,0050,0200,30,30,080,30,070,070,070,0030,38
550 MU 1) 2)
0,120,101,700,0200,0050,0200,30,30,080,30,070,070,150,0030,40

1) CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
2) Upon request

Mechanical properties: Tensile test

Test direction: longitudinal, minimum values for ReH und Rm also apply in cross direction.

Rp0.2 applies for the yield strength in case of missing ReH
A80 for thicknesses < 3 mm
A5 for thicknesses ≥ 3 mm

alform® Yield strength ReH
[MPa] 
tensile strength Rm
[MPa] 
elongation after fracture [%] min
A80 A5 
355 MU355 - 480430 - 5302024
380 MU380 - 510450 - 5502024
420 MU420 - 550480 - 5801822
460 MU 1)
460 - 590520 - 6401619
500 MU
500 - 650550 - 6801518
550 MU 1)
≥ 550
600 - 7401417

1) Upon request

Mechanical properties: Notch impact energy, edging radii, bending mandrel diameter

alform® Notch impact energy 1)
KV [Joule]
Edging radii 2
Ri min at 90° edging 
Bending mandrel diameter 
Test temperature
-20 °C 
Test temperature
-40 °C 
s < 3 mm s 3-6 mm s >6 mm Minimum bending radius Transverse sheet thickness = s 
355 MU
40270,25 s0,5 s0,8 s0 s
380 MU
40270,25 s0,5 s0,8 s0,5 s
420 MU
40270,5 s1,0 s1,0 s0,5 s
460 MU 3)
40270,5 s1,0 s1,4 s1,0 s
500 MU
40270,8 s1,2 s1,6 s1,0 s
550 MU 3)
40270,8 s1,2 s1,6 s1,5 s

1) KV minimum mean value from three samples (ISO-V, longitudinal) as related to full-size specimen (10 x 10 mm)
2Smallest permissible inside radius at 90° edging, Ri min.
3) Upon request

alform - Person mit Helm spricht

Note 

Notch impact energy can be measured from a plate thickness of ≥ 3 mm upon request. Notch impact energy tests on thicknesses < 6 mm do not comply with respective Euronorm standards.

Example dimensions

Maximum width per thickness

alform® Thickness [mm] 
2,02,53,03,54,06,0
355 MU
150016201620162016201620
380 MU
150016201620162016201620
420 MU
136016201620
1620
1620
1620
460 MU
1360
1620
1620
1620
1620
1620
500 MU
128014801620
1620
1620
1620
550 MU
1280148016201620
1620
1620

Additional dimensions upon request.
Depending on the dimensions and strength, we also supply: Pickled, oiled, trimmed

Steel strip
Slit steel strip
Cut-to-length sheets
cut shapes
Width 900 to 1620 mm
Strip width beginning at 30 mm
Length up to 12 m
Upon request