CN108611466A - A kind of heat treatment method for preventing Carbides in Tool Steels to be segregated - Google Patents

Abstract

The present invention relates to a kind of heat treatment methods, and in particular to a kind of heat treatment method for preventing Carbides in Tool Steels to be segregated.Technical scheme is as follows：A kind of heat treatment method for preventing Carbides in Tool Steels to be segregated carries out tempering heat treatment to tool steel, and technical process is：It is preheated first, 500~550 DEG C of heating temperature, heating time is 30~45min；Then heating early period is carried out, temperature is 750~800 DEG C, and heating time is 60~90min；Followed by the later stage heats, and temperature is 1000~1100 DEG C, and heating time is 100~120min；Isothermal holding is finally carried out, temperature is 900 ± 10 DEG C, and soaking time is 70~100min.The heat treatment method provided by the invention for preventing Carbides in Tool Steels to be segregated can make tool steel eliminate Cold Roll or reduce Cold Roll rank, and the control Cold Roll that energy is continual and steady.

Description

A kind of heat treatment method for preventing Carbides in Tool Steels to be segregated

Technical field

The present invention relates to a kind of metal heat treating methods, and in particular to a kind of heat treatment for preventing Carbides in Tool Steels to be segregated Method.

Background technology

Hoisting tool steel quality just has to improve the homogenization degree of carbide in its degree of purity and steel, with smelting side Formula and production technology are continuously improved, however carbide homogeneity is all the problem of tool steel control all the time in steel, is become The principal element of restriction tool steel quality.Tool steel production at present is affected by many factors, and tool steel annealed condition steel are band-like Carbide is serious, and rank is higher, and control is unstable, cannot meet requirements of the national standard, therefore seriously affect high-quality tool steel Exploitation.

Invention content

The present invention provides a kind of heat treatment method for preventing Carbides in Tool Steels to be segregated, and tool steel can be made to eliminate band-like carbon Compound reduces Cold Roll rank, and the control Cold Roll that energy is continual and steady, it is made to meet in tool steel well State's requirements of the national standard.

Technical scheme is as follows：It is a kind of prevent Carbides in Tool Steels be segregated heat treatment method, to tool steel into Row tempering heat treatment, technical process are：Preheated first, 500~550 DEG C of heating temperature, heating time be 30~ 45min；Then heating early period is carried out, temperature is 750~800 DEG C, and heating time is 60~90min；Followed by the later stage heats, Temperature is 1000~1100 DEG C, and heating time is 100~120min；Isothermal holding is finally carried out, temperature is 900 ± 10 DEG C, is protected The warm time is 70~100min.

Beneficial effects of the present invention are：Using present invention process method manufacture tool steel, make strand under high temperature section into Row adequately equal thermal diffusion so that the segregations such as carbon in matrix mitigate significantly, to eliminate carbide liquid-extraction, can eliminate or Cold Roll rank is reduced, and can continually and steadily obtain control Cold Roll, it is made to meet China national mark well Alignment request.When the band-like carbide grade that tool steel can be annealed is not reduced to 2.5 grades or less, qualification rate is 90% or more；It reduces When to 2.0 grades or less, qualification rate is 80% or more.Simultaneously avoid steel high temperature section long-time heating occur overheat, burning with And blow phenomenon.Follow-up rolling and it is cooling during, since the segregation of round steel at this time is smaller, the precipitation of carbide network The phenomenon that relatively disperseing, being not in a large amount of aggregations of carbide network, while having reached reduction carbide network rank Purpose, realize high-quality tool steel exploitation.

Specific implementation mode

A kind of heat treatment method for preventing Carbides in Tool Steels to be segregated carries out tempering heat treatment, technique mistake to tool steel Cheng Wei：It is preheated first, 500 DEG C of heating temperature, heating time 45min；Then heating early period is carried out, temperature is 800 DEG C, Heating time is 60min；Followed by the later stage heats, and temperature is 1100 DEG C, heating time 100min；Finally carry out at heat preservation Reason, temperature are 900 DEG C, soaking time 90min.

Claims (1)

1. a kind of heat treatment method for preventing Carbides in Tool Steels to be segregated, which is characterized in that tempering heat treatment is carried out to tool steel, Its technical process is：It is preheated first, 500~550 DEG C of heating temperature, heating time is 30~45min；Then early period is carried out Heating, temperature are 750~800 DEG C, and heating time is 60~90min；Followed by the later stage heats, and temperature is 1000~1100 DEG C, heating time is 100~120min；Finally carrying out isothermal holding, temperature is 900 ± 10 DEG C, soaking time is 70~ 100min。