Factorial design was used to investigate the contribution effect of cooling rate of stage between rolling and coiling and cooling rate after coiling on grain size, pearlite lamellar spacing, mechanical properties and hardness of hot rolled narrow 65Mn strip. The contribution of both cooling rates before and after coiling process, and the interaction combination effect of both rates were determined for each measured property. The regression models were built up to identify grain size, pearlite lamellar spacing, mechanical properties and hardness as a function in cooling rates before and after coiling process.
It was found that the contribution effect of cooling rate before coiling on grain size growth, enlargement of pearlite lamellar spacing, Ultimate Tensile Strength (UTS) and elongation is negative with different magnitude and it has positive effect on Yield Strength (YS) and hardness. Cooling rate after coiling has negative effect on grain size growth, enlargement of pealite lamellar spacing and elongation while it has positive contribution on UTS, YS, and hardness. The interaction combination effect of both two rates has very small positive contribution on YS and elongation, it has small positive effect on grain size growth, enlargement pearlite lamellar spacing, and it has large negative contribution on UTS and hardness. Factorial design technique is a successful technique to analysis the effecting parameters.

Please login / register to post comments

news in steel

5-strand slit rolling at Deacero Ramos

The extremely fast start-up continues at Deacero Ramos rolling mill in Arizpe, Mexico. After only a couple of weeks from the start of commissioning, the mill successfully produced rebar #3 (9.5 mm) with 5-strand slitting technology at 13 m/sec.

Meeting all market requirements with flexibility and precision

Mukand Sumi Special Steel Ltd. (MSSSL), a joint venture of Mukand Ltd., India, and Sumitomo Corporation, Japan, has placed an order with SMS group for the supply of a state-of-the art Special Bar Quality (SBQ) rolling mill for the production of straight round and hexagon bars, wire rod and bar-in-coils.

Modernization of pickling line entry section completed at SSAB Hämeenlinna

SSAB’s investment project to modernize the entry section of the pickling line at the Hämeenlinna Works has now been completed. The investment supports SSAB’s growth strategy in the automotive industry and enables a higher production volume of more advanced coated strip products.

SSAB successfully delivers steel plates to Kocurek Excavators for 35 years

For over three decades steel company SSAB has delivered steel plates to England-based My Inner Strenx members Kocurek Excavators, the industry leaders in the manufacture of demolition equipment.