CN109439871A - Steel conduction band process for decarbonizing - Google Patents

Abstract

A kind of steel conduction band process for decarbonizing, its step are as follows: 1) workpiece to be processed being placed in vacuum drying oven, be heated to 1000 DEG C -1200 DEG C；2) 2 hours are kept the temperature；3) furnace cooling is come out of the stove to room temperature；4) workpiece is placed in decarbonizing furnace again, is heated to 800 DEG C of decarburizations；5) 5 hours are kept the temperature；6) furnace cooling is to room temperature.After decarburization of the invention, three steel conduction band carbon content, hardness, low-temperature impact indexs meet technical requirements simultaneously, and one or two unqualified or even three all underproof phenomenon often occurs in solution.Qualification rate reaches 100%.

Description

Steel conduction band process for decarbonizing

Technical field

The invention belongs to technical field of heat treatment, in particular to a kind of steel conduction band process for decarbonizing.

Background technique

After having the steel components of an entitled conduction band that entirety is needed to carry out heat treatment decarburization on middle Small-Caliber Ammunition product It is just able to satisfy product requirement, the technique of original heat treatment decarburization is: rising to 880 DEG C after 800 DEG C of decarburizations and keeps the temperature 2 hours, sees Fig. 1；It is to the performance requirement of part after decarburization: (1), carbon content≤0.01% (2), HV≤83 (3), low at -63 DEG C~-65 DEG C Piece surface mustn't have fracture phenomena when temperature impact test.Three indexs must reach requirement simultaneously after part heat treatment decarburization, Otherwise it is judged to unqualified.But actual conditions are the heat treatment process according to Fig. 1, one or both of three performance indicators after decarburization Indexes Comparison is easy to reach requirement, three indexs while then extremely difficult, i.e. carbon content, hardness, the low-temperature impact that reach requirement It tests and often occurs one or two unqualified or even three all underproof phenomenon in three indexs, it is shifting to be difficult to completely The requirement that three indexs must be qualified simultaneously enough, be assemblied in part can not in ammunition products.

Summary of the invention

The object of the invention is in order to solve in above-mentioned background technique the technical problem that three indexs cannot be qualified simultaneously, And propose a kind of steel conduction band process for decarbonizing, enable three carbon content, hardness, low-temperature impact test indexs after part decarburization Reach requirement simultaneously.

Steel conduction band process for decarbonizing according to the present invention, cardinal principle is: 1), in specific three periods With the different combination gas high speed impact part of formula rate, separates the harmful element for influencing performance indicator with part and only retain Beneficial element.2), before decarburization in 1000 DEG C of temperatures above Slow cooling after held for some time, recombinate crystal structure and nocuousness The distribution of element, while rearrange composition mutually and being uniformly distributed.

Steel conduction band process for decarbonizing of the invention, its step are as follows:

1) workpiece to be processed is placed in vacuum drying oven, is heated to 1000 DEG C -1200 DEG C；

2) 2 hours are kept the temperature；

3) furnace cooling is come out of the stove to room temperature；

4) workpiece is placed in decarbonizing furnace again, is heated to 800 DEG C of decarburizations；

5) 5 hours are kept the temperature；

6) furnace cooling is to room temperature.

After decarburization of the invention, three steel conduction band carbon content, hardness, low-temperature impact indexs meet skill simultaneously Often there is one or two unqualified or even three all underproof phenomenon in art requirement, solution.Qualification rate reaches 100%.

Detailed description of the invention

Fig. 1 is the technique of original heat treatment decarburization；

Fig. 2 is the technique of present invention heat treatment decarburization.

Specific embodiment

Present invention will be further explained below with reference to the attached drawings and examples.

Embodiment

The steel conduction band process for decarbonizing of the present embodiment, as shown in Fig. 2, its step are as follows:

1) workpiece to be processed is placed in vacuum drying oven, is heated to 1000 DEG C -1200 DEG C；

2) 2 hours are kept the temperature；

3) furnace cooling is come out of the stove to room temperature；

4) workpiece is placed in decarbonizing furnace again, is heated to 800 DEG C of decarburizations；

5) 5 hours are kept the temperature；

6) furnace cooling is to room temperature.

Using the decarbonization process of the present embodiment, three steel conduction band carbon content, hardness, low-temperature impact indexs meet skill simultaneously Art requirement, qualification rate reach 100%.

Claims (1)

1. a kind of steel conduction band process for decarbonizing, its step are as follows:

1) workpiece to be processed is placed in vacuum drying oven, is heated to 1000 DEG C -1200 DEG C；

2) 2 hours are kept the temperature；

3) furnace cooling is come out of the stove to room temperature；

4) workpiece is placed in decarbonizing furnace again, is heated to 800 DEG C of decarburizations；

5) 5 hours are kept the temperature；

6) furnace cooling is to room temperature.