Вопрос № 933229 - Английский язык

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What is steel as a construction material? Steel may be classified as iron with the controlled amount of carbon. The amount of carbon in steel is generally less than 1.7 per cent. Ordinary structural steel should contain less than three tenth of one per cent carbon. This kind of steel also contains small amounts of phosphorus, sulfur, oxygen, nitrogen and silicon. Like iron and its alloys, steel belongs to ferrous metals. It is hard substance. Accordingly, it can be pulled, forged and melted. Generally, steel, this strong metal, like other metals, is a good conductor of electricity. Alloyed steel and stainless steel are corrosion-resistant kinds of steel.
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Steel belongs to …

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Where are steels of low carbon content used?
The most important metal in industry is iron and its alloy – steel. Steel is an alloy of iron and carbon. It is strong but corrodes easily through rusting, although stainless and other special steels resist corrosion. The amount of carbon in steel influences its properties considerably. Steels of low carbon content (mild steels) are quite ductile and are used in the manufacture of sheet iron, wire and pipes. Medium-carbon steels containing from 0.2 to 0.4 per cent carbon are tougher and stronger and are used as structural steels. Both mild and medium-carbon steels are suitable for forging and welding. High-carbon steels contain from 0.4 to 1.5 per cent carbon, are hard and brittle and are used in cutting tools, surgical instruments, razor blades and springs. Tool steel also called silver steel, contains about 1 per cent carbon and it is strengthened and toughened by quenching and tempering.

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Naval architects are engineers who design and supervise construction of ships. Ships must be designed and built so that they are safe, stable, strong, and fast enough to perform the type of work intended for them. A naval architect must be familiar with the variety of modern shipbuilding.
Marine engineering is a specialized branch of mechanical engineering devoted to the design and operation of systems, both mechanical and electrical, needed to propel a ship. Engineers in this field develop diesel engines and steam turbines that provide enough power to move the ship at the required speed.
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A naval architect must be familiar with …

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Soldering is recommended for making connections on electrical circuits, but it should never be used where strong joints are required. For permanent joints between two dissimilar materials like nylon and metal, it is advisable to use adhesives. For temporary jobs, like fitting a maintenance cover, screw-fastening should always be used. Riveting is recommended for permanent sheet-metal joints such as outer casing fitting. Although welding should always be used for steel support girders, brazing can be used for medium-sized joints where strength is required; for example the joint between the base and body of a hydraulic jack.
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Screw-fastening should always be used for …

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Cast iron should be used for components which must be strong in compression. It is recommended for machine beds and frames. Wrought iron is recommended for components where tensile strength is required; for example, crane hooks and railway couplings. Mild steel should be used for components which must be strong in shear; therefore it is recommended for rivets and bolts. Medium carbon steel is recommended for components where impact strength is required; for example, axles and hammer heads.
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Wrought iron is recommended for …

Заполните пропуски в инструкции следующими словами:
1) These ear protectors must be carried everywhere in the 1_______ hangar.
2) These 2_______ must be lubricated every day.
3) Drivers are required to check the 3_______, lights, tyres, and water before a long car journey.
4) Apprentices must always wear 4_______ in the workshop.