At present, the frames of heavy-duty trucks are largely produced from a modified 1027 steel, by uncoiling and shearing mults from hot bands, cold forming into a uniform thickness channel section, and then heat treating. This paper discusses the development of new compositions and processing that could be applied in the production of variable thickness channels for this or similar applications. Two processing routes have been pursued, viz. hot-rolling a section for a subsequent quench and temper heat treatment and hot-rolling a microalloyed composition to develop suitable properties in the as-rolled condition. For the first route, an aluminum-killed Mn-B steel is utilized; this steel can be heat treated to higher tensile strengths (hence higher fatigue strengths) and in greater thicknesses compared to the modified 1027 steel while still retaining the current toughness level. For the second route, a V-N microalloyed steel has been developed; in this case, a yield strength in excess of 580 MPa (85 ksi) in combination with a 20 J (15 ft-lb) Charpy transition temperature well below 0 Cel (+32 F) are produced in the hot-rolled condition.
Metallurgical development of rolled steel channels for truck frames
Metallurgische Entwicklung von gewalzten Stahlprofilen für Lastwagenrahmen
1991
12 Seiten, 14 Bilder, 4 Tabellen, 18 Quellen
Aufsatz (Konferenz)
Englisch
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|Steel frames for motor bus and motor truck bodies
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Steel frames for motor bus and motor truck bodies
Engineering Index Backfile | 1938