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IOD Product Direction List of metallurgical rules losening Paris, 28 th June 04

IOD Product Direction List of metallurgical rules losening Paris, 28 th June 04. DRAFT V0.1. EXEMPLE DE FORMALISME A VALIDER RENDRE PLUS CONSISTENT LE TEXTE. Steelmaking line. Fos/Sagunt. M etallurgical rules losening. Products families. Details. Avilès. Bremen. Liège. Dunkerque.

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IOD Product Direction List of metallurgical rules losening Paris, 28 th June 04

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  1. IOD Product Direction List of metallurgical rules loseningParis, 28th June 04 DRAFT V0.1

  2. EXEMPLE DE FORMALISME A VALIDER RENDRE PLUS CONSISTENT LE TEXTE Steelmaking line Fos/Sagunt Metallurgical rules losening Productsfamilies Details Avilès Bremen Liège Dunkerque Eko Florange Gent Stakes Saving k€/y * Adjust Ti addition to the minimum required to obtain the free Ti content IFS, IFHS • Benchmark is Tifree[i] >0 for Arcelor 03 and Tifree > 3 for Arcelor 04 and Tifree >7 for Arcelor 05. • The scattering of C, N, S has to be taken into account, including C pick-up. • Effect on mechanical properties is negligible • Positive effect on clogging and so on defect rates (slivers) and sequence length [i] Free Ti is calculated as Tifree = Ti -3,42.N-1,5.S-4.C 0.05€/t/ TWP of Ti 1280 Increase the maximum P content in IFS routes IF • Lower production costs at the converter if maximum P is higher (0.83€/ 10-3%). Maximum allowed lies between 12 and 18. 10-3% for Arcelor05 2€/t from P= 12 to 17 10-3% 1800 Increase the maximum S content in IFS IF, IFHS • The target is max S= 15 10-3% in IF, reduction of the quantity of CaO to make ladle slag (depend on converter process). Also possibility to change scrap type addition 0.5 €/t for 1 TWP if more of S allowed 1400 Removal of constraints on chemical analysis Optimise B addition Drawing hot rolled (DD13 and DD14) • Modification of B addition for hot rolled drawing grades 0.2 to 0.3 €/t 30 Decrease of Mn addition Al-K, C-Mn grades • Lower limits to obtain the technical targets. Rule Mn/S > 10 to trap sulphur as MnS To be defined 50 Increase the maximum S in DP DP • Concerning DP, the target <3. 10-3% does not seem necessary for all applications.Hole expansion is a limit for low grades. Rationalisation of steel codes => high constraint. The low limit is required for some application. 3€/t 100 Legend To do Ongoing Done Non Applicable * Reference : January 2003

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