Changes

While steel was already around soon after iron working developed, it took some time before mastering the technology improved. In the Medieval Islamic worldThe Romans mastered using coal, rather than wood, blast for fuel in furnaces were developed by the 10-11th centuries. These allowed more industrial production and This gave them a new fuel source to produce better production of quality ironand steel. New steel production techniques from China and India, which developed by the 5th century CE, had now spread to other areas of the Old World. This included mixing wrought and cast iron together to form a stronger weapon/tool. The so-called Bessemer method, which is a modern steel production technique and developed much later, already had a precursor developed in China by the 11th century CE. This included repeated cooling and reforging the steel into a stronger product. Problems of having relatively brittle iron were now effectively being solved. In effect, previouslyPreviously, the quality of the iron ore affected the quality of weapons and tools. Now, new production techniques that enabled carbonized iron to be more easily made, and thus creating steel, allowed more rapid spread of better weapons and tools. In the Medieval Islamic world, blast furnaces were developed by the 10-11th centuries. These allowed more industrial production and better production of iron.