CN110257601A - The secondary ultra-soft spheroidizing method of high speed steel - Google Patents
The secondary ultra-soft spheroidizing method of high speed steel Download PDFInfo
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- CN110257601A CN110257601A CN201910628017.4A CN201910628017A CN110257601A CN 110257601 A CN110257601 A CN 110257601A CN 201910628017 A CN201910628017 A CN 201910628017A CN 110257601 A CN110257601 A CN 110257601A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses the secondary ultra-soft spheroidizing methods of high speed steel, the secondary ultra-soft spheroidizing method and step of high speed steel is that high speed steel forging is pricked material shove charge first, annealing process routinely is annealed, then the high speed steel forging after conventional annealing is pricked into material shove charge again, continues to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, heat preservation 4-16 hours, temperature is cooled to 500 DEG C hereinafter, last take out carries out being air-cooled to room temperature by fast cooling.Using secondary ultra-soft spheroidizing method of the invention, the abundant spheroidizing of steel may be implemented, annealed structure is uniform and stable, and uniform ultralow annealing hardness, has good cold moulding performance.
Description
Technical field
The present invention relates to high speed steel annealing fields, the specifically secondary ultra-soft spheroidizing method of high speed steel.
Background technique
Forging rolling material after high-speed steel is forged or forging rolling must slow cooling and progress spheroidizing heat treatment, purpose prevent in time
Steel cracking is scrapped, and so that the reduction of its hardness is adapted for machining and cold plastic deformation processing, is prevented it from organizing the pearl of abundant nodularization
Body of light annealed structure (secondary globular carbide and part primary carbide are as uniformly distributed on granular pearlite) quenches
The defects of mixed crystal, does tissue preparation for its final tool and mould product quenching and tempering heat treatment, then finishing packed products steel
Material.
Currently, high-speed steel forging rolling annealing process is high-temperature phase-change spheroidizing, and one is isothermal spheroidizings, another
Kind is continuous spheroidizing annealing, and principle is all that the slow cooling of forging rolling material or direct shove charge are heated to Ac1 point or more heat preservation to turn tissue
Become austenite, then control Slow cooling after 760-650 DEG C of perlitic transformation area enough time, be furnace-cooled to 500 DEG C with
Under come out of the stove.The general steel grade of mass production is more, of large quantities, and specification is more, batch generally at several tons to tens tons, also want sometimes tubulature or
Tinning is protected.Every furnace steel is not synchronized in heating, heat preservation, temperature-fall period, and the transformation temperature of each high-speed steel, pearlite
Change most fast temperature to be also not easy clearly to determine, therefore mass production high-speed steel forging rolling material is substantially using continuous spheroidizing annealing work
Skill.Due to the transformation temperature Ac1 high of high-speed steel, austenitizing temperature is annealed generally between 850-920 DEG C, the transformation of pearlite body
Temperature range is at 680-780 DEG C, the defects of easily causing exceeded decarburization, oxidation, carburizing, nitriding, therefore each production unit is to liter
Temperature, heat preservation and temperature descending section are all largely worked, and are substantially achieved optimum value, are kept steel most short in the hot stage time,
To reduce exceeded decarburization, carburizing, nitriding and the risk of oxidation.Shorten the entire annealing cycle as far as possible simultaneously, is annealed into reducing
This.
Existing this common process when the working of a furnace is bad, have no alternative but a variety of grades of steel or when specification loads in mixture, high-carbon high-alloy
When the high speed steel of content, Powder High-speed Steels, spray forming high-speed steel, and it is used for formed punch, contracting square-shank tap, the high property of cold drawing
Energy, powder steel, injection steel require hardness low, and when cold moulding performance is high, usually appearance annealing transformation is not complete, nodularization is insufficient, hardness
High unqualified steel, it is necessary to re-start spheroidizing and be saved, or even repeatedly save all difficulties and reach requirement, and cause
The major defects such as exceeded carburizing, oxidation, nitriding, and time-consuming, effort, energy consumption are taken off, delivery is seriously affected, great quality is caused to damage
It loses.
Summary of the invention
The purpose of the present invention is to provide the secondary ultra-soft spheroidizing methods of high speed steel, to solve in above-mentioned background technique
The problem of proposition.
To achieve the above object, the invention provides the following technical scheme:
The secondary ultra-soft spheroidizing method of high speed steel, comprising the following steps:
(1) high speed steel forging is pricked into material shove charge, annealing process routinely is annealed；
(2) the high speed steel forging after conventional annealing is pricked into material shove charge again；
(3) shove charge again is warming up to 700-760 DEG C, keeps the temperature 2-4 hours；
(4) continue to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, keeps the temperature 4-16 hours；Make
The overcooling austenite (being transformed into martensite after being cooled to room temperature) that the tissue of primary annealing steel not yet changes, is further transformed into pearl
Body of light and nodularization (or martensite carbide precipitate and assemble nodularization be transformed into tempered sorbite), pearly-lustre transformed for the first time
The further nodularization of body, Carbide Precipitation assemble nodularization, reach nodularization effect and the super-low-hardness requirement of requirement；
(5) fast cooling, according to the case where annealing furnace and deformation of steel require selection cooling method, temperature is cooled to 500
DEG C or less；
(6) it takes out and carries out being air-cooled to room temperature.
Compared with prior art, the beneficial effects of the present invention are:
Using secondary ultra-soft spheroidizing method of the invention, the abundant spheroidizing of steel may be implemented, annealed structure is equal
Even stabilization, and uniform ultralow annealing hardness, have good cold moulding performance；Solves conventional annealing, secondary routine is moved back
The annealed structure of fire or multiple conventional annealing does not conform to and quality problems with high hardness；Especially to the powder of superelevation alloy content and high V
Last steel, injection steel, the very-high performance high-speed steel of hardly possible transformation and difficult nodularization, and the cold-extruded formed punch for requiring the ultralow cold plasticity of hardness high
The high speed steel that equal cold working require, it is particularly suitable；To containing high Mo, the high speed containing the oxidizable easily de- carburizing such as AI or high transformation temperature
Steel are fabulous annealing process；It, can different grades of steel, different rule to the normal underproof steel of spheroidizing are saved
Lattice steel load in mixture same furnace and anneal together, avoid secondary high-temperature annealing still unqualified, or oxidation, nitridation, the de- exceeded danger of carburizing.
Using secondary ultra-soft spheroidizing method of the invention, quality is stablized securely and reliably, and annealing quality qualification has at all
Guarantee；Can more steel grades, multi items wait expecting one furnace annealing of composition, can solve that high-speed steel steel grade annealing device wide in variety is in short supply to ask
Topic, scheduling of production and easy to operate, raising utilization rate of equipment and installations；Because annealing temperature low (the 800 DEG C or less) time is short, do not produce substantially
The unqualified risks such as life secondary defect such as decarburization, nitriding, moustache, while can largely energy conservation and shortening delivery cycle, extension anneal
The maintenance cycle of furnace reduces maintenance cost；Can more steel grade multi items with technique anneal produce, improve the utilization rate of annealing device,
Generate significant economic benefit.
Specific embodiment
The technical solution of the patent is explained in further detail With reference to embodiment.
Choose a kind of high speed steel, ingredient 1.10Wt%C, 1.40Wt%W, 9.40Wt%Mo, 3.80Wt%Cr,
1.10Wt%V, 8.0Wt%Co, remaining is Fe.
Embodiment one
The secondary ultra-soft spheroidizing method of high speed steel, comprising the following steps:
(1) high speed steel forging is pricked into material shove charge, annealing process routinely is annealed；
(2) the high speed steel forging after conventional annealing is pricked into material shove charge again；
(3) shove charge again is warming up to 700-740 DEG C, keeps the temperature 2-4 hours；
(4) continue to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, keeps the temperature 4-12 hours；Make
The overcooling austenite (being transformed into martensite after being cooled to room temperature) that the tissue of primary annealing steel not yet changes, is further transformed into pearl
Body of light and nodularization (or martensite carbide precipitate and assemble nodularization be transformed into tempered sorbite), pearly-lustre transformed for the first time
The further nodularization of body, Carbide Precipitation assemble nodularization, reach nodularization effect and the super-low-hardness requirement of requirement；
(5) fast cooling, according to the case where annealing furnace and deformation of steel require selection cooling method, temperature is cooled to 500
DEG C or less；
(6) it takes out and carries out being air-cooled to room temperature.
Embodiment two
The secondary ultra-soft spheroidizing method of high speed steel, comprising the following steps:
(1) high speed steel forging is pricked into material shove charge, annealing process routinely is annealed；
(2) the high speed steel forging after conventional annealing is pricked into material shove charge again；
(3) shove charge again is warming up to 720-760 DEG C, keeps the temperature 2-4 hours；
(4) continue to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, keeps the temperature 8-16 hours；Make
The overcooling austenite (being transformed into martensite after being cooled to room temperature) that the tissue of primary annealing steel not yet changes, is further transformed into pearl
Body of light and nodularization (or martensite carbide precipitate and assemble nodularization be transformed into tempered sorbite), pearly-lustre transformed for the first time
The further nodularization of body, Carbide Precipitation assemble nodularization, reach nodularization effect and the super-low-hardness requirement of requirement；
(5) fast cooling, according to the case where annealing furnace and deformation of steel require selection cooling method, temperature is cooled to 500
DEG C or less；
(6) it takes out and carries out being air-cooled to room temperature.
Embodiment three
(1) high speed steel forging is pricked into material shove charge, annealing process routinely is annealed；
(2) the high speed steel forging after conventional annealing is pricked into material shove charge again；
(3) shove charge again is warming up to 700-740 DEG C, keeps the temperature 2-4 hours；
(4) continue to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, keeps the temperature 8-16 hours；Make
The overcooling austenite (being transformed into martensite after being cooled to room temperature) that the tissue of primary annealing steel not yet changes, is further transformed into pearl
Body of light and nodularization (or martensite carbide precipitate and assemble nodularization be transformed into tempered sorbite), pearly-lustre transformed for the first time
The further nodularization of body, Carbide Precipitation assemble nodularization, reach nodularization effect and the super-low-hardness requirement of requirement；
(5) fast cooling, according to the case where annealing furnace and deformation of steel require selection cooling method, temperature is cooled to 500
DEG C or less；
(6) it takes out and carries out being air-cooled to room temperature.
Example IV
(1) high speed steel forging is pricked into material shove charge, annealing process routinely is annealed；
(2) the high speed steel forging after conventional annealing is pricked into material shove charge again；
(3) shove charge again is warming up to 720-760 DEG C, keeps the temperature 2-4 hours；
(4) continue to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, keeps the temperature 4-12 hours；Make
The overcooling austenite (being transformed into martensite after being cooled to room temperature) that the tissue of primary annealing steel not yet changes, is further transformed into pearl
Body of light and nodularization (or martensite carbide precipitate and assemble nodularization be transformed into tempered sorbite), pearly-lustre transformed for the first time
The further nodularization of body, Carbide Precipitation assemble nodularization, reach nodularization effect and the super-low-hardness requirement of requirement；
(5) fast cooling, according to the case where annealing furnace and deformation of steel require selection cooling method, temperature is cooled to 500
DEG C or less；
(6) it takes out and carries out being air-cooled to room temperature.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The preferred embodiment of the patent is described in detail above, but this patent is not limited to above-mentioned embodiment party
Formula within the knowledge of one of ordinary skill in the art can also be under the premise of not departing from this patent objective
Various changes can be made.
Claims (1)
1. the secondary ultra-soft spheroidizing method of high speed steel, which comprises the following steps:
(1) high speed steel forging is pricked into material shove charge, annealing process routinely is annealed；
(2) the high speed steel forging after conventional annealing is pricked into material shove charge again；
(3) shove charge again is warming up to 700-760 DEG C, keeps the temperature 2-4 hours；
(4) continue to heat up, it is ensured that the minimum temperature of steel reaches 10-30 DEG C of Ac1s point or less, keeps the temperature 4-16 hours；
(5) fast cooling, according to the case where annealing furnace and deformation of steel require selection cooling method, by temperature be cooled to 500 DEG C with
Under；
(6) it takes out and carries out being air-cooled to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458256A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Annealing process of 1.2746 die steel of 45NiCrMoV or 4CrNi4MoV |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030097A (en) * | 1987-04-01 | 1989-01-04 | 冶金工业部钢铁研究总院 | Thermomechanical annealing technology for martensite steel sections |
| JPH04371521A (en) * | 1991-06-18 | 1992-12-24 | Sumitomo Metal Ind Ltd | Production of steel pipe for bearing |
| CN102424899A (en) * | 2011-12-28 | 2012-04-25 | 河冶科技股份有限公司 | High-speed steel annealing method |
| CN106011404A (en) * | 2016-07-08 | 2016-10-12 | 邢台钢铁有限责任公司 | Spheroidizing annealing method for medium-and-low-carbon alloy cold forging steel |
| CN109136515A (en) * | 2017-08-08 | 2019-01-04 | 湖南泰嘉新材料科技股份有限公司 | The annealing process of bimetallic composite steel band |
-
2019
- 2019-07-12 CN CN201910628017.4A patent/CN110257601A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030097A (en) * | 1987-04-01 | 1989-01-04 | 冶金工业部钢铁研究总院 | Thermomechanical annealing technology for martensite steel sections |
| JPH04371521A (en) * | 1991-06-18 | 1992-12-24 | Sumitomo Metal Ind Ltd | Production of steel pipe for bearing |
| CN102424899A (en) * | 2011-12-28 | 2012-04-25 | 河冶科技股份有限公司 | High-speed steel annealing method |
| CN106011404A (en) * | 2016-07-08 | 2016-10-12 | 邢台钢铁有限责任公司 | Spheroidizing annealing method for medium-and-low-carbon alloy cold forging steel |
| CN109136515A (en) * | 2017-08-08 | 2019-01-04 | 湖南泰嘉新材料科技股份有限公司 | The annealing process of bimetallic composite steel band |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458256A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Annealing process of 1.2746 die steel of 45NiCrMoV or 4CrNi4MoV |
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