Special quenching agent for large shaft and preparation method of quenching agent

Abstract

The invention discloses a special quenching agent for a large shaft and a preparation method of the quenching agent, belonging to the field of quenching agents. The quenching agent is prepared from the following components: sodium chloride, sodium hydroxide, sodium citrate, cis-butenedioic acid, mesotrione, lotus root starch, acrylic acid, p-cresol, metribuzin and water. Through adding reasonable components and strictly controlling the component proportion, when used for quenching a shaft which is made of 45# steel and has the diameter of 1.8-3.5m, the quenching agent has the following advantages that the workpiece cooling speed is high within the temperature range of 650-450 DEG C, and the cooling speed is low at the temperature of below 400 DEG C, so that a favorable quenching effect can be obtained, and a quenching crack condition can also be avoided. The preparation method of the quenching agent has the advantages that all components in the quenching agent are completely dispersed and uniformly distributed by controlling temperatures and adding sequences of raw materials, the quenching agent is similar to a colloid in shape, and the cooling speed at the temperature of below 400 DEG C is lowered.

Description

technical field [0001] The invention belongs to the field of quenching agent and its processing technology, in particular, it relates to a special quenching agent for large shafts and its manufacturing method, more specifically, it relates to a kind of quenching agent for 45# steel with a diameter of 1.8- Special quenching agent for shafts between 3.5m. Background technique [0002] The performance of the steel after quenching depends on the microstructure of the steel after quenching, and the quenching microstructure is determined by the composition of the steel, the size of the parts and the quenching cooling rate. There are two effective ways to improve the hardening effect of steel parts: one is to increase the alloy element content of raw materials to shift the C curve to the right; the other is to increase the quenching cooling rate. The latter is simple, easy to implement and low in cost, and is an effective way to improve the quenching quality of steel parts. At the...

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Problems solved by technology

[0005]Aiming at 45# steel, the shaft with a diameter of 1.8-3.5m is easy to break, there is no special quenching agent, the production cost is high, the risk is high, and it needs To solve the problem of developing a new quenching agent, the present invention provides a special quenching agent for large shafts and its manufacturing method. The quenching agent is made by adding reasonable components and strictly controlled component distribution ratio. For the material is 45# steel, the diameter When the shaft between 1.8-3.5m is quenched, the cooling rate of the workpiece is fast in the range of 650 ~ 450 ° C, and the cooling rate is slow below 400 ° C. Not only can a good quenching effect be obtained, but also the occurrence of quenching cracks can be avoided. The production method of the quenching agent, by controlling the temperature of the raw materials and the order of addition, ensures that each component in the quenching agent is completely dispersed and evenly distributed, so that the form of the quenching agent is close to colloidal, and the cooling rate below 400 ° C is reduced.