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Bolckow, Vaughan and Co of Cleveland Iron and Steel Works, South Bank, Middlesbrough were ironfounders.
1846 they started blast furnaces to produce iron at Witton Park in Co. Durham
1850 Vaughan began to exploit the Cleveland ironstone near to Middlesbrough.
1851 Built the Middlesbrough blast-furnaces and the Eston furnaces
The firm also acquired collieries, limestone quarries, additional ironstone workings, and brickfields.
By 1855 the partners had a dozen blast furnaces making iron on Teesside
1864 Incorporated as a limited company. The name of the business was changed from Bolckow and Vaughan to Bolckow, Vaughan and Co. The company was established to acquire the iron works and collieries of the firm of the same name.  John Vaughan gradually withdrew from the management of the business.
1866 See 1866 Cleveland Blast Furnaces for detail of furnaces at Eston, Middlesbrough and Witton Park.
1878 On the death of Henry Bolckow, his nephew Carl became chairman
1879 Sidney Gilchrist Thomas persuaded E. W. Richards, manager of Bolckow, Vaughan and Co's works, to try out the process that he and his cousin, Percy Gilchrist, had invented for dealing with the phosphorus in pig iron produced by the Bessemer converter leading to the commercial production of steel.
1888 Started to build a few railway locomotives. 
1889 Cabry and Kinch's improved railway sleeper. 
1892 Carl Bolckow left the chairmanship
1914 Ironmasters, steel manufacturers and colliery owners. Specialities: Cleveland pig iron, hematite, ferro-manganese and spiegeleisen steel rails and plates, tramrails, ironstone, coal, coke and by-products such as sulphate of ammonia, benzol, toluol, xylol, sol, naphtha and motor spirit; also fire brick and plate bricks, ground annealed slag and artificial stone. The manufacture of steel is carried on by the acid and basic processes, both Bessemer and Siemens. Employees 18,000. 
Early 1920s Acquired Darlington Rolling Mills Co
1923 Bolckow, Vaughan and Co acquired an "important interest" in Redpath, Brown and Co, makers of structural steel, with works in London, Manchester, Edinburgh, Glasgow, in order to secure an outlet for finished steel.
1927 See Aberconway for information on the company and its history.
1929 Became part of Dorman, Long and Co.