The Use of Carbon, High-Chromium Steels for Liners of Mud Pumps and Drilling Rigs

Abstract

The paper shows that high temperature heating (from 1 100 to 1 170 0C) for the subsequent quenching of high-chromium steels of a martensitic-carbide class 95X18 and X12MFL provides structure to the metal base, which consist of high-carbon containing martensite and residual metastable austenite with some carbides. The resulting structure has a high capacity for frictional hardening. Experiments with cold processing treatment of the analyzed steels also showed that after high-temperature quenching with subsequent cooling to -70 0C, sufficient cooling martensite is formed, which in combination with residual metastable austenite, provides an increase of abrasive wear resistance by 25 % compared to high temperature annealing.

The Influence of Thermal Processing on the Structure and Wear-Resistance of Perlite-Class Steels

“…2) обес-печивает высокую твердость (61 HRC). Однако максимальная износостойкость при абразивном изнашивании достигается после высокотемпературной закалки стали (1100÷1175 °С), формирующей мартенситно-карбидную структуру с метастабильным аустенитом в количестве 10-15 % и высокой способностью к фрикционному упрочнению [15][16][17][18][19][20].…”