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Hardfacing alloys contain as base elements typically iron, nickel, or cobalt, to which metallurgists add varying amounts of carbon, chromium, molybdenum, tungsten, silicon, manganese, vanadium, and boron. To raise hardness, the primary property for wear resistance, alloy designers add elements that either form hard constituents (carbides, borides, or Laves phase), or that strengthen the matrix by going into solid solution. Carbon content determines toughness and abrasion resistance--as carbon rises, abrasion resistance increases and toughness drops. Chromium forms carbides, increases corrosion resistance, and adds high-temperature strength. Tungsten, a potent carbide former, also boosts high temperature strength, as does cobalt. Tougheners include nickel and manganese. Boron forms hard wear-resistance borides.

Molten pig iron is a relatively impure alloy of iron, with about 4 percent carbon and other materials. It is used chiefly as a primary ingredient of steel, but is also used for many finished products such as pipe fittings and structural castings. However, these products are rarely made directly from blast furnace iron. In most cases, the cold pig iron is re-melted in brick or refractory lined cupolas or malleable iron furnaces. In these lined furnaces the quality and analysis of the iron can be more accurately adjusted and controlled, before casting the metal into final form.

Another popular recreational machine is the motorcycle. The one Dean is sitting on in Figure 5 (see page 20) is a smaller model, but motorcycles come in all sizes. These machines pose the most potential for serious injury and require both bike-riding and driving skills, but are not a training vehicle for someone just learning to drive.Children growing up on a ranch, farm or other rural property traditionally spend more time with family activities than children living in a city or town. They also assume more responsibility for helping with the work required to keep such a lifestyle running smoothly. Farmers are especially notorious for teaching their children to drive tractors, trucks and other equipment at an early age. Fun karts are an ideal way for these families to introduce their children to the skills and responsibilities of driving vehicles and machinery. Some models are powerful enough to pull a small trailer for hauling feed or doing chores around the homestead.