Question

In: Mechanical Engineering

Iron ores found in Ireland and Britain are not suitable for production of high-quality steel because...

Iron ores found in Ireland and Britain are not suitable for production of high-quality steel because they contain too much of which one of the following elements:

(a) Sulphur
(b) Carbon
(c) Nitrogen
(d) Phosphorus?

The inside of the stack of a blast furnace is usually lined with:

(a) Steel sheets
(b) Ceramic refractories (c) Asbestos
(d) Water-cooled copper?

To improve the fuel-efficiency of the modern blast furnace, which one of the following may be added to the blast:

(a) O2 (b) N2 (c) H2 (d) CO2?

In steelmaking, basic slags are necessary for the removal of which element:

(a) Carbon
(b) Silicon
(c) Phosphorus (d) Oxygen?

Solutions

Expert Solution

1) Iron ores found in Ireland and Britain are not suitable for production of high-quality steel because they contain too much of Sulphur.

  • Sulphur is generally treated as impurity and has adverse effect on steel properties.
  • Carbon increases strength and durability.
  • Nitrogen increases corossion resistance and strength.
  • Phosphorus is used as additive in steels for improving machining and atmospheric corrosion resistance.

2) The inside of the stack of a blast furnace is usually lined with ceramic refractories to protect the furnace shell.

3) To improve the fuel-efficiency of the modern blast furnace O2 is added to the blast.

  • O2 is used to make heating of blast furnace gas in blast furnace stoves more efficient.

4) In steelmaking, basic slags are necessary for the removal of phosphorus.

  • During tapping, the rapid mixing of slag with steel removes the phosphorus.

samet mamat answered 2 years ago
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