Deep hardened boron steel having improved breaking resistance and wear characteristics

摘要

(57) Abstract The deep hardening boron steel, from approximately 0.23 0.37 weight % carbon, from approximately 0.40 1.20 weight % manganese, from approximately 0.50 2.00 weight % silicon, from approximately 0.25 2.00 weight % the chrome, from approximately 0.20 approximately 0.80 weight % moribiden, from 0.05 0.25 weight % vanadium, from 0.03 0.15 weight % titanium, from 0.015 0.050 weight % aluminum, from 0.0008 0.009 weight % 0.013 weight % has the constituent which consists of nitrogen from boron and 0.005. In addition as for this constituent, phosphorus and the sulfur each one approximately 0.025 weight % under it is desirable to include. After the hardening and the drawing, there is no alumimium nitride substantially in the product which was formed from this material, possesses minute martensite grain structure, possesses the combination of distribution and the nitrogen carbide and the carbide deposit of the background nitride of nano meter size and high high-level Characteristic and resistance break Characteristic. The deep hardening steel item which executes this invention often in hot state, especially is effective to the land engagement equipment which receives break, and wear.