Chrome vanadizing process of automotive chain pin shaft

Abstract

The invention relates to a chrome vanadizing process of an automotive chain pin shaft with the advantages of larger load, wear resistance, corrosion resistance, oxidation resistance, good fatigue property and long service life. The finely-ground pin shaft is arranged in a converter, 60-70 percent of anhydrous borax, 10-15 percent of Cr2O3, 8-15 percent of V2O5 as a penetrating agent and a certain amount of reducing agent are simultaneously added into the converter, the converter is kept to be in a rotating state and is subjected to heat preservation for 10 hours at a temperature of 1000 plus or minus 2 DEG C, chrome vanadizing is performed, the pin shaft subjected to chrome vanadizing is poured into quenching oil to be quenched, and residual waste salt on the surface is boiled by using boiled water; after the reducing agent is added into salt bath, vanadium is reduced firstly, chrome is likely to be simultaneously reduced only when the reducing agent is excessive, and active vanadium, chrome alum and chrome vanadium boron atoms can be respectively obtained according to different consumptions of the reducing agent so as to realize vanadinizing, chrome vanadizing and chrome vanadium boronizing of steel.

Description

technical field [0001] The invention relates to a chrome-vanadium co-infiltration process of an automobile chain pin shaft with relatively large load, wear resistance, corrosion resistance, oxidation resistance, fatigue performance and long service life, and belongs to the field of automobile parts manufacturing. Background technique [0002] CN102242335A, the name "a quenching and tempering method of a pin shaft", includes the following steps: first step, the workpiece to be quenched and tempered is processed by a grinding machine to remove surface impurities; second step, the workpiece is put into a quenching and tempering furnace, Close the furnace door, fill in nitrogen and carburizing and nitriding gas, raise the furnace temperature to 510°C to 790°C, keep the furnace temperature for 30 minutes to 60 minutes, and drop methanol at the same time; the third step, when the furnace temperature rises to 790°C At -950°C, drop kerosene and keep the furnace temperature for 40-60...

AI Technical Summary

Problems solved by technology

Its disadvantages: first, the vanadium layer is very thin, and its resistance to high temperature oxidation and thermal fatigue is low, so it cannot withstand large loads; second, the chromium layer has good resistance to high temperature oxidation, but its hardness is low and its wear resistance is poor ; Third, it is easy to form a carbon-deficient zone under the chromizing or vanadiumizing layers of low and medium carbon steels, so it is only suitable for workpieces working under light loads

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