<P> Steel greatly improved the productivity of railroads . Steel rails lasted ten times longer than iron rails . Steel rails, which became heavier as prices fell, could carry heavier locomotives, which could pull longer trains . Steel rail cars were longer and were able to increase the freight to car weight from 1: 1 to 2: 1 . </P> <P> As early as 1895 in the UK it was being noted that the heyday of the Bessemer process was over and that the open hearth method predominated . The Iron and Coal Trades Review said that it was "in a semi-moribund condition . Year after year, it has not only ceased to make progress, but it has absolutely declined ." It has been suggested, both at that time and more recently, that the cause of this was the lack of trained personnel and investment in technology rather than anything intrinsic to the process itself . For example, one of the major causes of the decline of the giant ironmaking company Bolckow Vaughan of Middlesbrough was its failure to upgrade its technology . The basic process, the Thomas - Gilchrist process, remained in use longer, especially in Continental Europe, where iron ores were of high phosphorus content and the open - hearth process was not able to remove all phosphorus; almost all inexpensive construction steel in Germany was produced with this method in the 1950s and 1960s . It was eventually superseded by basic oxygen steelmaking . </P> <P> In the U.S., commercial steel production using this method stopped in 1968 . It was replaced by processes such as the basic oxygen (Linz--Donawitz) process, which offered better control of final chemistry . The Bessemer process was so fast (10--20 minutes for a heat) that it allowed little time for chemical analysis or adjustment of the alloying elements in the steel . Bessemer converters did not remove phosphorus efficiently from the molten steel; as low - phosphorus ores became more expensive, conversion costs increased . The process permitted only limited amount of scrap steel to be charged, further increasing costs, especially when scrap was inexpensive . Use of electric arc furnace technology competed favourably with the Bessemer process resulting in its obsolescence . </P> <P> Basic oxygen steelmaking is essentially an improved version of the Bessemer process (decarburization by blowing oxygen as gas into the heat rather than burning the excess carbon away by adding oxygen carrying substances into the heat). The advantages of pure oxygen blast over air blast was known to Henry Bessemer, but the 19th - century technology was not advanced enough to allow for the production of the large quantities of pure oxygen to make it economically feasible for use . </P>

Who developed a process to create steel from pig iron before the open hearth furnace