Join Date: Mar 2012
Location: santa barbara CA
Lotus mangalloy characteristics
I picked up a pretty beat up Lotus Eclair frame, Mangaloy(as spelled on the decal) tubing. When adding braze-ons, etc. are there any different methods/materials needed as compared to cromo, or is it pretty much the same? I've read that mangalloy work hardens so it may be difficult to drill, but maybe thats when working with mang plate and not thin tubes.
the following is from the wiki on mangalloy:
Mangalloy is made by alloying steel, containing 0.8 to 1.25% carbon, with 11 to 15% manganese. Mangalloy is a unique non-magnetic steel with extreme anti-wear properties. The material is very resistant to abrasion and will achieve up to three times its surface hardness during conditions of impact, without any increase in brittleness which is usually associated with hardness. This allows mangalloy to retain its toughness.
Most steels contain 0.15 to 0.8% manganese. High strength alloys often contain 1 to 1.8% manganese. At about 1.5% manganese content, the steel becomes brittle, and this trait increases until about 4 to 5% manganese content is reached. At this point, the steel will pulverize at the strike of a hammer. Further increase in the manganese content will increase both hardness and ductility. At around 10% manganese content the steel will remain in its austenite* form at room temperature. Both hardness and ductility reach their highest points around 12%, depending on other alloying agents.
I didn't have a clue what austenite was, maybe you don't either, so here is the def (I also don't get some this definition, but I don't want to turn the thread into a dictionary/theasuarus/technical abstract so thats it for me!).
Noun 1. austenite - a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite
gamma iron - a nonmagnetic allotrope of iron that is the basis of austenite; stable between 906 and 1403 degrees centigrade
austenitic steel - steel that has enough nickel and chromium or manganese to retain austenite at atmospheric temperatures
primary solid solution, solid solution - a homogeneous solid that can exist over a range of component chemicals; a constituent of alloys that is formed when atoms of an element are incorporated into the crystals of a metal