日本金属学会誌

J. Japan Inst. Metals, Vol. 17, No. 3 (1953),
pp. 134-139

An Investigation on Boron-treated Steels (5th Report). On the Effects of Addition of Boron Upon the Mechanical Properties of Low-Carbon, Low-Alloy Steels [II]

Yûnoshin Imai and Hikotarô Imai


Abstract:

This paper describes the results of mechanical tests on several series of low-carbon (0.05 ∼ 0.08%), low-alloy (0.3 ∼ 0.5% Mo) steels containing boron (0.003%), tested in a hardened-tempered condition. Like the results of tests under normalized condition, in a 550°-tempered condition, the mechanical properties of these types of steels are improved markedly by addition of boron, the max. stress rising from 55 kg/mm2 to 75 ∼ 85 kg/mm2 and the yield stress, from 40 kg/mm2 to 70 ∼ 80 kg/mm2. The reduction of area or impact values are not effected so much; the former remaining at 55 ∼ 65% and the latter showing the considerably high values of 7.5 ∼ 12.0 kg · m/cm2. The elongation is slightly decreased from 30% to 20 ∼ 25%. An addition of Mn or Cr, in the order of 1.0% or an increase of carbon-content up to 0.2%, are very effective to raise their strength much as in samples prepared under normalized condition.


(Received 1952/11/11)

Keywords:


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.