The concept and grading method of the“martensitic grade”in the standard of《Metallographic Test for Carburizing Auto Gear》were analyzed and discussed according to the experience and test results.

This paper introduced the technologic examination and the equipment development of all-purpose quenching and tempering automatic product line with controllable atmosphere in the type of roller hearth,and the bearing steel processed by the bainite step quenching in nitric salt,the martensite step quenching,the bainite isothermal quenching and the martensite direct quenchingetc in this product line.

Property requirements of super-martensitic stainless steel especially using for hydroelectric station are briefly introduced in this paper,characteristics and basic principle of alloying process of this steel,especially,the influence of alloy process on the content and distribution of retained austenite and δ ferrite in the steel are also analyzed in detail.

Effect of deformation on the temper process of lath martensite;

Cold rolling deformation and recrystallization behavior of martensite Ni_(40.5)Co_(32.5)Al_(27) alloy;

Influence of heat treatment on the properties of the heat-resistance martensite stainless steel 0Cr_(17)Ni_4Cu_4Nb;