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The earliest known ironwork are beads from Jirzah in Egypt dating from 3500 BC and made from meteoric iron with the earliest use of smelted iron dates back to Mesopotamia. However, the first use of conventional smelting and purification techniques that modern society labels as true iron-working dates back to the Hittites in around 2000 BC.
The Painted Grey Ware culture (PGW) is an Iron Age Indo-Aryan culture of the western Gangetic plain and the Ghaggar-Hakra valley in the Indian subcontinent, conventionally dated c.1200 to 600–500 BCE, [1] [2] or from 1300 to 500–300 BCE.
Cast iron development lagged in Europe because wrought iron was the desired product and the intermediate step of producing cast iron involved an expensive blast furnace and further refining of pig iron to cast iron, which then required a labor and capital intensive conversion to wrought iron.
Any wood grain with very fine fibers of cells that are not visibly porous. compass saw conversion The reduction of a whole log into pieces suitable for working. Conversion can be done in three basic ways: sawn, hewn, or split. coping saw crook Longitudinal bending to one side, caused by uneven seasoning or grain. See wood warping. crotch
Steel or iron are usually avoided, as iron can react with moist timber to produce rust staining, or some tannin-rich woods such as oak or chestnut will provide indelible blue-black iron tannates. After heat bending the wood, clamping the wood into a solid mold will reinforce the bends made to the wood while drying, preventing the wood from ...
Slag from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. As the slag is cooled down by water, several chemical reactions from a temperature of around 2,600 °F (1,430 °C) (such as oxidization ) take place ...
However, copper by itself was too soft for tools requiring edges and stiffness. At some point tin was added into the molten copper and bronze was developed thereby. Bronze is an alloy of copper and tin. Bronze was an important advance because it had the edge-durability and stiffness that pure copper lacked.
Recent excavations in Middle Ganga Valley done by archaeologist Rakesh Tewari show iron working in India may have begun as early as 1800 BCE. [5] Archaeological sites in India, such as Malhar, Dadupur, Raja Nala Ka Tila and Lahuradewa in the state of Uttar Pradesh show iron implements in the period between 1800 BCE – 1200 BCE.