Air valve steel for internal combustion engine

Abstract

The invention provides an air valve steel for an internal combustion engine. The air valve steel comprises the following components in percentage by weight: 22-24 percent of Cr, 13-15 percent of Ni, 3.5-4.5 percetn of Mn, 2-3 percent of Nb, 1.5-2 percent of Mo, 0.1-0.2 percent of Si, 1.5-2 percent of Si-B-C-N, 0-0.1 percent of C, 0-0.1 percent of N, 0-0.02 percent of P, 0-0.02 percent of S and the balance of Fe. The air valve steel for the internal combustion engine provided by the invention is austenitic steel into which 1.5-2 percent by weight of Si-B-C-N is added, so that the high-temperature strength, oxidation resistance, corrosion resistance and abrasion resistance of the austenitic steel can be enhanced by using the Si-B-C-N, and the austenitic steel can reach the using performance of a high-load air valve of an internal combustion engine.

Description

technical field

[0001] The invention belongs to the field of alloy technology, and in particular relates to an internal combustion engine valve steel. Background technique

[0002] Intake valves and outlet valves are necessary and key components of internal combustion engines such as gasoline engines and diesel engines. Since the operating speed of the internal combustion engine is between 1000 rpm and 6000 rpm, and the operating temperature is as high as 780 ° C to 950 ° C, the air valve usually reciprocates at a high frequency, and the air valve will have an impact on the valve seat, that is, the seating force, resulting in The air valve produces friction and wear and the force on the disc and neck of the air valve. Air valve materials need to have good oxidation and corrosion resistance, wear resistance and wear reduction properties and high temperature strength to be able to work in harsh environments for a long time, so that the internal combustion engine has a longer ...