The following is a bit of composed info on Martin - Siemens steel and Siemens - Martin steel. There's more if anyone is interested.
Carl(Karl) Wilhelm Siemens, British subject Charles William Siemens, was born near Hannover on April 4th, 1823 and expired on November 19th, 1883(Knighthood same year). He was one 14(fourteen) children, the eldest brother being Ernst Werner Siemens who founded Siemens Brothers in London and during the years 1874 & 1875 Brothers Siemen laid the Direct United States Cable using a ship named Faraday, which the Brothers Siemens had designed and built. I would venture to guess that they also made the cable. Ernst Werner Siemens had a knack for things electrical and salesman Carl Wilhlem Siemens departed Germany on March 10th, 1843 bound for England to peddle one of Ernst Werner Siemens' patent to fund the education of the rest of the children. He remined in England for the remainder of his days. It was the knowledge of Electricity and Magnetism thru is brother Ernst Werner Siemens that allowed Carl Wilhelm Siemens to make the advances in metallurgy that he did.
The original Siemen's 1861 patented method(put into practice in 1865 in England) was an acid process that melted solely pig iron and then oxidize the impurities by imputing ore into the mix. The Brothers Martin, Emile & Pierre, of Sireuil France devised a new method, named Martin - Siemens, which introduced wrought iron scrap metal into the equation. The Martin - Siemens method had a bit of oxidation but was for the most part a dilution process instead. So the Siemens-Martin process(a name used in the Britian and the U.S. of A.), or recipe, was an oxidation process involving the mixture of pig iron and ore while the Martin - Siemens process(a name used in France and some parts of Europe) was a dilution process involving the mixture of pig iron and wrought iron scap metal. So depending on the name, a different recipe is noted. There's some confusion if there actually was a Martin furnace but in 1868 a facility utilizing the Siemens - Martin process was built in Trenton New Jersey by the New Jersey Steel & Iron Company under the direction of Abram S. Hewitt, who traveled to France and was most impressed by the advances of the Frenchmen. Martin-Siemens or Siemens - Martin steel has the characteristic of being easier to manipulate cold than other steels and works even better when heated. I'm sure there are composition percentages listed which may not vary much between the 2 steel types.
For now I don't know about the Acier Martele Siemens stamp and guess it to be a trademark and more than likely a recipe.
Kind Regards,
Raimey
rse
