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The research reported here was designed to extend in-line treatment to martensitic stainless steel wire coils, thereby eliminating or drastically reducing the long subcritical annealing treatment needed at present to transform the as-quenched structure of the rolled stock to render it suitable for its intended use. The study covered the three compositions of major commercial interest, through : - measurement of the parameters of the present rolling schedule at STA/DeltaCogne's Aosta Works - determination of TTT and CCT diagrams - execution of experimental heat cycles. The parameters of the new "continuous" heat cycle were established on the basis of microstructure examinations and hardness tests on samples thus treated. As a result, two possible alternatives were identified, both of which permit marked savings in energy and time, compared with the conventional process. In particular, the second of the two produces use characteristics that are consistently on a par with or better than those of coils treated in the conventional manner. In-line treatment of martensitic steels can be performed in a similar tunnel furnace to that indicated for austenitic and ferritic steels. Treatment time is the same for all three types of steel (thirty minutes).

Additional information

Authors: GUGLIELMI F, Centro Sviluppo Materiali S.p.A., Roma (IT)
Bibliographic Reference: EUR 12199 IT (1989) 46 pp., MF, ECU 4, blow-up copy ECU 6.25
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