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How to: make Steel

Roli the

slabs between heavy rollers to produce sheet Steel for industry.

Five extreme materials

■ Titanium is a metal used in military jet planes. It is as strong as Steel but half the weight, and it can withstand high temperatur es.

W*# ■ Cast the molten Steel into slabs.

■ Kevlar is a very strong fiber, used to make bulletproof vests and ultra-strong ropes.

Refine

the molten Steel with agents to remove oxygen, hydrogen, and nitrogen and produce low-carbon Steel.

■ Carbon-carbon is

a materiał used in rockets and spacecraft because it can withstand very high temperatur es.

■ Aerogel is a elear, jellylike materiał so light that it is almost not there! It has been used in a spacecraft to trap particles from a comet without damaging them.

■ Aluminum

honeycomb is used to make helicopter rotor blades and parts for aireraft and racecars because of its lightness combined with its strength.

^ What is a polymer?

Plastic is madę of long, chainlike molecules called polymers. There are a lot of different plastics madę of different polymers. Some polymers are found . in naturę. Amber (fossilized plant juices, pictured) and cellulose (found in plant cells) are natural polymers. Most plastics are madę from Chemicals produced from oil.

Materials