What are bars made of?

Steel
	Steel is an alloy of iron, carbon and other elements, usually inexpensive and widely available. Most rods are made from steel, which can be effective for a wide variety of uses.
Carbon steel
	Carbon steel is steel in which the main alloying element is carbon. It is harder than regular steel, but less ductile, meaning it is more difficult to shape into the desired shape and is more likely to break or break than it is to bend.
	Low carbon steel (0.30–0.59%), also called "mild steel", "simple carbon steel" or "low grade steel", is usually available at an affordable price and has a lower carbon content, making it more malleable (easy to bend) but weaker .
	High carbon steel (0.6–0.99%), also referred to as "high quality steel", can be heat treated for added strength. Trace amounts of other elements in the high carbon steel alloy can have a debilitating effect and lead to brittleness at operating temperatures. Sulfur content in trace amounts is particularly harmful.
	Ultra high carbon steel (1.0–2.0%) is extremely tough when tempered and can withstand high levels of wear and abrasion.
alloy steel
	Alloy steel generally refers to low alloy steel, steel that has been alloyed with a wider range of elements in large quantities, improving mechanical properties.
High alloy boron steel
	This is steel hardened by alloying with boron. Boron is an economical but effective alloying element that provides improved resistance to rust, corrosion and abrasion. The addition of boron is also effective in hardening steels, especially low carbon steels, which cannot be heat treated. However, boron quenching can reduce ductility; this means that worn tools will break rather than bend and cannot be salvaged.
steel spring
	Low alloy low carbon steel with high yield strength. The high yield strength means that products made from this steel are able to return to their original shape after significant deformation (twisting or bending). This type of steel is best used in hand and pry bars, which are designed to provide some resilience.
Forged steel
	During the forging process, steel is attached to the surface of a hammer and dropped from a height onto a workpiece to deform it into the shape of a die (a tool used during forging to cut or press the metal into the desired shape). Forged steel is almost always more durable than cast or machined metal because the forging process aligns the grain structure with the shape of the tool. This type of steel is best used in rods designed for extreme strength such as lever rods, large crowbars and gorilla rods.
Titanium
	Titanium is light and strong, making it a popular metal for hand tools. Titanium is best used in molding rods and handy rods. Because of their light weight, titanium tools are popular even among rescue divers, but they are much more expensive and very malleable, making them less durable. Commercial titanium has the same tensile strength as low grade steel alloys, but weighs 45% less per pound.
aluminum
	Aluminum is a cheap, lightweight metal with a density and stiffness that is about three times less than that of conventional steel. With a few exceptions, aluminum is too soft to be used in rods that require high tensile strength. An exception may be the situation when a non-magnetic rod is especially needed.
Manufacturing processes
	temper "Tempering" is a method used to harden an alloy. Since many of the hardening methods used in tool making can make the alloy brittle, tempering is used to improve ductility. Tools designed to increase strength, such as digging rods, are hardened at low temperatures, while tools designed to retain some "spring", such as hand rods, are hardened at higher temperatures.
	When tempered, alloy steels are repeatedly heated and cooled, which allows the internal alloying elements to react within the metal - this creates "intermetallic phases" known as "precipitations" that increase the brittleness of the alloy.
	hardening During quenching, steel is heated to a normalization temperature (760+°C) and quenched in water, oil or cold air.
	When alloy steel is heated above 760°C, carbon atoms migrate to a central position in the atomic structure of the metal. When the alloy is then quenched, the carbon atoms remain in place, resulting in a very hard steel.
What is tensile strength?
	Tensile strength is the amount of load a metal can withstand without breaking, tearing, or tearing. High tensile strength means that the material can withstand a high degree of stress (such as bending) before failure, while low tensile strength means that the material breaks easily when a load is applied.