Effects of Copper, Nickel, Chromium and Tin on Mechanical Properties of Titanium-bearing Extralow-carbon Steel Sheets

Abstract

The effects of copper, nickel, chromium and tin additions on the mechanical properties of extralow-carbon titanium-bearing continuous annealed steel sheets were studied. The following are the findings obtained: (1) Copper and chromium additions up to approximately 0.2% each increased tensile strength and decreased total elongation and the r value. (2) With the specimens each containing 0.2% copper and 0.2% chromium, lowering the slab reheating temperature to 1050°C decreased tensile strength and increased total elongation and the r value. (3) Nickel addition up to 0.12% produced no significant effect on tensile properties and the r value. (4) Tin addition up to 0.085% increased tensile strength and decreased total elongation and the r value. With the specimens containing tin, lowering the slab reheating temperature did not improve their total elongation and r value. (5) The effects of copper, nickel, chromium and tin contents on mechanical properties proved to be proportional to the difference in the atomic radius between iron and these allowing elements. (6) Copper, nickel, chromium and tin proved to produce different effects on the r value. With the specimens containing copper, nickel and chromium having slightly larger atomic radii than that of iron, lowering the slab reheating temperature improved their r value. With the specimens containing tin having a significantly larger atomic radius than that of iron, by comparison, lowering the slab reheating temperature produced only a small effect. © 1995, The Iron and Steel Institute of Japan. All rights reserved.