Fact:
The three basic ingredients in making steel are coal, iron ore and limestone.

 

Fact:
The first step in making iron was converting the coal into coke at the Coke Ovens.

 

Fact:
Steel was made in the Open Hearth in six 175 ton tilting furnaces.

 
 
 
 

 

The Art of Steel Making
By Sydney S. Slaven

Steel is defined as a hard strong alloy consisting principally of iron and containing carbon and sometimes other metals. It is not difficult to make steel, (it has been likened to making soup where the various ingredients are boiled to the desired brand). The difficulty lies in making steel of an excellent quality - this the steelworkers at the Sydney steel plant did for one hundred years.

In 1957 the DOSCO plant was a fully integrated steel operation which not only produced iron and steel, but a diversified group of products. At this time the Sydney plant was a progressive, profitable business employing over 500 steelworkers and was heading for a record breaking production year. Although rails were the primary product, (the finest rail produced in the world), the plant also manufactured billets, bars, rods, wire and nails. In the following years the plant was never again to reach such a diversity of product. Therefore, this is the best year to describe the Sydney steel plants operations.

The three basic ingredients in making steel are coal, iron ore and limestone. Dosco was able to supply the plant from its own resources. Coal from their coalfields at Glace Bay and New Waterford was sent by rail to the Coke Ovens. The iron ore was mined at the Dosco mine at Wabana NFLD., and shipped to Sydney. Also limestone was also shipped from the Dosco owned mine at Aquatuna, NFLD.

The first step in making iron was converting the coal into coke at the Coke Ovens. The Coke Ovens consisted of ovens of brick construction and each held about 16 tons. The ovens were heated by recycling hot gases from the reduction of coal to coke. There is a space between the ovens and this is where the gas was burned. It created a red hot oven. Coal was placed in the oven and then the oven was sealed. Gasses were sweated out of the coal rather then being burned out, leaving the coke product. Gases are the volatile constituents of coal which are driven off by heat, giving a rich coal gas, thus the Coke Ovens was self sufficient. Coke was not the only by-product produced from coal gas. Other salable items that resulted were tar, ammonia salt and benzol. Also excess coke oven gas was piped to the blooming mill pits were it was used as a combustible. The coke was transported to the Blast Furnace.

Iron was produced at the Blast Furnace using a combination of iron ore, coke and limestone. Iron ore was changed to molten iron using coke, which acted as a fuel and carbon agent, and limestone which acted as a cleaning agent. These furnaces ran for years on the gas produced in making iron. This heated gas was gathered in adjoining stoves where is was kept hot by checker bricks. Reversing valves returned this hot gas to the furnace when a cast of iron was being made. Thusly, a Blast Furnace ran off its own heated gases. The limestone was lighter than the ore and was used to carry impurities to the top of the heat in the form of slag. The iron was run off into ladles and was transported to the Open Hearth.

Steel was made in the Open Hearth in six 175 ton tilting furnaces. These furnaces were heated by bunker c oil which was atomized with steam and then sprayed through nozzles into the furnace pocket. Charging a furnace consisted of first a meltdown of scrap steel. The iron from the Blast Furnace was stored in a metal furnace on site. When the scrap steel was melted iron was poured out of the metal furnace into a ladle and this ladle was then poured into the O.H. furnace itself.

Other alloys were added as needed. Manganese was added to reduce sulfur and limestone and spar were used to drive out impurities. The hardness of the steel depended on the amount of carbon. A soft heat would have a low carbon content of up to .25%, while a hard steel would require a .45% to 1.5% content. Coke was added to the molten steel to increase the carbon content as needed. Soft steel, or low carbon content, was used to produce bars, rods, wire or nails. Hard steel or high carbon content went into the production of rails. We have only to examine a simple nail to understand how critical carbon content was. If the steel was too soft, low carbon content, the nail would bend when struck. On the other hand, if the carbon content was too high, the nail would shatter.

Molten steel was tapped from the back of the furnace by pushing a billet into the tap hole to release the steel into a waiting ladle. The impurities in the form of slag came last and they were run off into a slag ladle. The slag from the Open Hearth and Blast furnace was a viable commodity as it was used as a foundation in roadbuilding, basements and also as common fill. Many parts of Sydney sit upon areas that have been reclaimed from the sea by the use of slag as a fill. The tapped steel went through a teeming process in which it was poured into ingot moulds which were transported by a locomotive along a narrow gauge line to a stripper yard where the moulds were stripped off what was now a solid ingot, although still glowing hot.

continued...

 

 

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Last updated February 1, 2006