MU series

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.

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⁾	0,10	0,10	1,20	0,018	0,005	0,020	0,3	0,3	0,08	0,3	0,05	0,05	0,05	0,003	0,28
380 MU ¹⁾	0,10	0,10	1,20	0,020	0,005	0,020	0,3	0,3	0,08	0,3	0,05	0,05	0,05	0,003	0,30
420 MU ¹⁾	0,10	0,10	1,40	0,020	0,005	0,020	0,3	0,3	0,08	0,3	0,05	0,05	0,05	0,003	0,34
460 MU ¹⁾ ²⁾	0,10	0,10	1,50	0,020	0,005	0,020	0,3	0,3	0,08	0,3	0,07	0,07	0,07	0,003	0,36
500 MU ¹⁾	0,10	0,10	1,60	0,020	0,005	0,020	0,3	0,3	0,08	0,3	0,07	0,07	0,07	0,003	0,38
550 MU ¹⁾ ²⁾	0,12	0,10	1,70	0,020	0,005	0,020	0,3	0,3	0,08	0,3	0,07	0,07	0,15	0,003	0,40

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 R_eH und R_m also apply in cross direction.

R_p0.2 applies for the yield strength in case of missing R_eH
A₈₀ for thicknesses < 3 mm
A₅ for thicknesses ≥ 3 mm

alform®	Yield strength R_eH [MPa]	tensile strength R_m [MPa]	elongation after fracture [%] min
alform®	Yield strength R_eH [MPa]	tensile strength R_m [MPa]	A₈₀	A₅
355 MU	355 - 480	430 - 530	20	24
380 MU	380 - 510	450 - 550	20	24
420 MU	420 - 550	480 - 580	18	22
460 MU ¹⁾	460 - 590	520 - 640	16	19
500 MU	500 - 650	550 - 680	15	18
550 MU ¹⁾	≥ 550	600 - 740	14	17

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
alform®	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	40	27	0,25 s	0,5 s	0,8 s	0 s
380 MU	40	27	0,25 s	0,5 s	0,8 s	0,5 s
420 MU	40	27	0,5 s	1,0 s	1,0 s	0,5 s
460 MU ³⁾	40	27	0,5 s	1,0 s	1,4 s	1,0 s
500 MU	40	27	0,8 s	1,2 s	1,6 s	1,0 s
550 MU ³⁾	40	27	0,8 s	1,2 s	1,6 s	1,5 s

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

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]
alform®	2,0	2,5	3,0	3,5	4,0	6,0
355 MU	1500	1620	1620	1620	1620	1620
380 MU	1500	1620	1620	1620	1620	1620
420 MU	1360	1620	1620	1620	1620	1620
460 MU	1360	1620	1620	1620	1620	1620
500 MU	1280	1480	1620	1620	1620	1620
550 MU	1280	1480	1620	1620	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

You will find detailed technical information in the data sheets.