Oil casing manufacturers explain the causes of casing cracks

The oil casing manufacturer introduces the factors that cause the occurrence of the oil casing manufacturer: when the proportion of carbon dissolved in the base material increases to a certain level, the base material of the oil casing manufacturer's high vanadium alloy steel changes to a combined base material with martensite and austenite, and with the improvement of cementite, the high vanadium alloy steel obtains sufficient strength and corresponding flexibility. This type of high vanadium alloy steel has good wear resistance. The editor believes that this is due to the combined base material with martensite and austenite. This type of combined base material has its own corresponding strength to resist external pressure, and also guarantees the important support function for cementite that can improve the base material.

As the proportion of carbon increases, the martensite in the base material changes to high-carbon martensite, and the M7C3 type cementite with a large amount of chromium and molybdenum forms in the twin in a fishbone shape. In this way, the high-carbon martensite with low toughness and the fishbone-shaped M7C3 type cementite have a distorting effect on the base material. The oil casing manufacturer pointed out that the toughness of high-vanadium alloy steel decreases, and the formation is easy to occur in the M7C3 type cementite. In other words, the formation of M7C3 type cementite with a large amount of chromium and molybdenum is not conducive to improving the collision damage characteristics of high-vanadium alloy steel.

In summary, in order to obtain high-vanadium alloy steel with good wear resistance, the carbon ratio must be controlled within an appropriate range.