SUPRAFORM TM 380


High-strength low-alloy (H.S.L.A.) steels have been commercially available for some time now.  However, they have suffered form the disadvantage that they are generally available in thicker sections, need special precautions when being welded and, because of their high strength, are more difficult to form. SUPRAFORM TM 380 is a steel which overcomes the above limitations.


TM 380 is a H.S.L.A. steel, has a minimum yield strength of 380 MPa and, because of the low carbon content, typically 0.06%, has excellent weldability when using any of the standard arc or resistance processes, without the need to take any special precautions.  Severe forming can readily be carried out on TM 380 due to its superior formability, thus further increasing the steel's versatility. With the need for higher yet stronger structures, effective mass savings can be achieved without the penalty of reduced overall strength by selecting a steel which has a combination of higher tensile and yield strengths and reduced thickness.


Typical applications for TM 380 are body and chassis components for tipper trucks, bumper brackets, engine mounting brackets, crane jibs and booms, trailers, mining equipment, rolling stock, cold formed sections, etc.
 
  Typical Chemical Composition % (ladle analysis)  

SUPRAFORM  
grade
C. Mn. Si. P (max) S (max) Al Nb
TM 340  
TM 380  
TM 420  
TM 460  
TM 5001)
0.05  
0.06  
0.07  
0.08  
-
0.35  
0.55  
0.85  
1.15  
-
0.13  
0.13  
0.18  
0.18  
-
0.015  
0.015  
0.015  
0.015  
-
0.006  
0.006  
0.006  
0.006  
-
0.03  
0.03  
0.03  
0.03  
-
0.013  
0.015  
0.028  
0.033  
-

  Mechanical Properties  

SUPRAFORM  
grade
Tensile Strength  
MPa (min)
Yield Strength  
MPa
Elongation (% min) gauge length 50 mm 180o Bend test 
(mandrel dia)
t < 3.0 t > 3.0
TM 340 
TM 380 
TM 420 
TM 460 
TM 5001)
400 
450 
490 
530 
560
340 / 420 
380 / 460 
420 / 500 
460 / 560 
500 / 600
22 
20 
19 
18 
-
24 
22 
21 
20 
-
0.5t 
0.5t 
0.5t 
1.0t 
-

 NOTE:  Tensile test to BS 18 part 2 or 3.  Bend test BS 1639 - 1) Availability on application only.