CN106011444A - H-section steel roll collar heat treatment technology - Google Patents
H-section steel roll collar heat treatment technology Download PDFInfo
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- CN106011444A CN106011444A CN201610625490.3A CN201610625490A CN106011444A CN 106011444 A CN106011444 A CN 106011444A CN 201610625490 A CN201610625490 A CN 201610625490A CN 106011444 A CN106011444 A CN 106011444A
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses an H-section steel roll collar heat treatment technology. The technology comprises the steps of: H-section steel roll collar molding, hot shake-out, and heat treatment; spheroidizing treatment; cold collar cutting treatment; high temperature diffusion treatment; normalizing treatment; and tempering treatment. The invention adjusts the sequential order of the heat treatment process, i.e. the high temperature diffusion step is arranged after the cold collar cutting step, after the adjustment, a lot of excess materials and a protective layer are removed by cold collar cutting, the workpiece thickness is reduced, and the high temperature diffusion link can be completed by only 4-7h, more than half of time is shortened, also diffusion becomes more sufficient, and the matrix structure has better quality. After shortening of the high temperature diffusion link time, the phenomenon that high temperature treated glass slag turns into a solution and flows on a trolley surface of a heat treatment furnace is effectively controlled, equipment failure is reduced, equipment life is prolonged, and the operation cost is lowered.
Description
Technical field
The present invention relates to a kind of H profile steel collars Technology for Heating Processing, belong to technical field of heat treatment technology.
Background technology
Collars is the main parts size of H profile steel universal mill, it is divided into horizontal collars and two kinds of edger roll ring, along with country's development of high ferro and going deep into of enterprise transformation, to channel-section steel, I-steel, angle steel, U-shaped steel, bridge rail demand increasing, the collars quantity demand manufacturing shaped steel is also stepped up.
The specification of H profile steel collars and model have a variety of, no matter but the H profile steel collars of that specification and model, its work layer on surface requires have good wearability, resistance to flaking, conventional surfacing is high-carbon half steel, its heart portion to have certain hardness and toughness, to reach the stress produced during resisting hot charging and using, conventional heart portion material is graphitic steel.
The conventional Technology for Heating Processing of H profile steel collars is substantially had following step:
1, after the molding of H profile steel collars, heat is unpacked and is turned heat treatment.
2, High temperature diffusion.Coacervation process after collars cast is a nonequilibrium coacervation process, owing to composition having Cr alloying element, microstructure segregation is the most serious, the purpose of High temperature diffusion is to remove microsegregation, composition is uniform, improve the Distributing of carbide, at 800 DEG C--980 DEG C can eliminate netted and needle-like proeutectoid carbide；When temperature reaches 1060 DEG C, net carbide all dissolves, but still has the primary carbide of thick bulk in tissue.
3, nodularization.The purpose of nodularization is to reduce hardness, improves processing cutting ability, it is thus achieved that granular pearlitic structrure.
The process of High temperature diffusion and nodularization is as shown in Figure 1.
4, turn cold work and cut ring.
5, normalizing.The purpose of normalizing is to eliminate net carbide, improves faller gill shape, the form of column carbide, makes faller gill shape, column carbide disconnect, become graininess or corynebacterium, improves the comprehensive mechanical property of shaped steel collars on the premise of not affecting wearability.
6, tempering.Tempering is to eliminate structural stress and thermal stress, it is thus achieved that sorbite tissue, reaches the hardness of requirement.
The process of normalizing and tempering is as shown in Figure 2.The working lining metallograph of last products obtained therefrom as it is shown on figure 3, the metallograph of matrix as shown in Figure 4.
When actual production operation; when collars proceeds to heat treatment execution High temperature diffusion after heat is unpacked; owing to there is the dope layer of 3～5mm on its surface; and heart portion has substantial amounts of glass protection slag to define layer protective layer in surrounding; thus the time of the time of collars workpiece diffusion temperature to be reached a high temperature and samming is the veryest long, thus cause energy consumption high, and diffusion effect is not fine; have impact on matrix, product quality is impacted；Additionally, glass dregs becomes solution after high temperature, easily flow on the chassis face of heat-treatment furnace, damage resistor, cause equipment fault, reduce equipment life, increase operating cost.
Summary of the invention
The goal of the invention of the present invention is: for the problem of above-mentioned existence, it is provided that a kind of H profile steel collars Technology for Heating Processing, is optimized existing technique, and to reduce energy consumption, shortening processes the cycle, improves properties of product.
The technical solution used in the present invention is such that
A kind of H profile steel collars Technology for Heating Processing, comprises the following steps:
The first step, after H profile steel collars molding, heat is unpacked, and turns heat treatment；
Second step, spheroidising；
3rd step, turns cold work and cuts ring process；
4th step, High temperature diffusion processes；
5th step, normalized treatment；
6th step, temper.
As preferably, second step, under the conditions of 770-790 DEG C, carry out spheroidising, the process time is 9-11 hour.
As preferably, the 4th step, under the conditions of 1020-1060 DEG C, carry out High temperature diffusion process, the process time is 4-7 hour.
As preferably, the 5th step, under the conditions of 900-920 DEG C, carry out normalized treatment, the process time is 4-6 hour.
As preferably, the 6th step, under the conditions of 490-510 DEG C, carry out temper, process time 11-13 hour.
In sum, owing to have employed technique scheme, the present invention have adjusted order before and after heat treatment step, after the step of High temperature diffusion is put into the step that cold work cuts ring, but after adjusting, will have the effect that
1, i.e. turn cold work after first carrying out spheroidising, and spheroidising and cut ring, owing to the utilization rate of blank natively only has 50-60%; after cutting ring by cold work; eliminate a large amount of clout and protective layer, decrease the thickness of workpiece, thus the most ensuing High temperature diffusion processing links；
2, the time of High temperature diffusion link, originally need just can complete for 12 hours；After cold work cuts ring, no longer there is a large amount of clout to consume energy, thus effectively reduce the energy consumption of High temperature diffusion, heat-transfer effect is more preferable, and equal temperature time is short, altogether has only to can complete for 4-7 hour the link of High temperature diffusion, time shortens most, and diffusion is more abundant, and the quality of matrix is more preferable；
3, after the time shortening of High temperature diffusion link, glass dregs becomes solution stream phenomenon on the chassis face of heat-treatment furnace after high temperature and is effectively controlled, and equipment fault reduces, and extends equipment life, reduces operating cost.
Accompanying drawing explanation
Fig. 1 is diffusion and the nodularization link of existing H profile steel collars Technology for Heating Processing.
Fig. 2 is normalizing and the tempering link of existing H profile steel collars Technology for Heating Processing.
Fig. 3 is the working lining metallograph (having 10-15% in carbide in broken netted, block, pin strip, graininess) of existing H profile steel collars Technology for Heating Processing products obtained therefrom
Fig. 4 is the matrix metallograph of existing H profile steel collars Technology for Heating Processing products obtained therefrom.
Fig. 5 is the process chart of the present invention.
Fig. 6 is the working lining metallograph (having 12-15% in carbide in broken netted, block, pin strip, graininess) of present invention process products obtained therefrom
Fig. 7 is the matrix metallograph of present invention process products obtained therefrom.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the present invention is described in detail.
Embodiment: as it is shown in figure 5, a kind of H profile steel collars Technology for Heating Processing, comprise the following steps:
The first step, after H profile steel collars molding, heat is unpacked, and turns heat treatment；
Second step, spheroidising under the conditions of 770-790 DEG C, the process time is 9-11 hour；
3rd step, turns cold work and cuts ring process；
4th step, carries out High temperature diffusion process under the conditions of 1020-1060 DEG C, and the process time is 4-7 hour；
5th step, carries out normalized treatment under the conditions of 900-920 DEG C, and the process time is 4-6 hour；
6th step, carries out temper under the conditions of 490-510 DEG C, processes time 11-13 hour.
By the working lining metallograph of present invention process products obtained therefrom as shown in Figure 6, the metallograph of matrix is as shown in Figure 7.And through Hardness Surveillance, present invention process products obtained therefrom in terms of hardness than original technique products obtained therefrom slightly improve.Before adjustment, the hardness of working lining is 57-61HSD, and the hardness of heart portion matrix is 33-39HSD；After adjustment, the hardness of working lining is 61-66HSD, and the hardness of heart portion matrix is 38-42HSD.
Claims (5)
1. a H profile steel collars Technology for Heating Processing, it is characterised in that comprise the following steps:
The first step, after H profile steel collars molding, heat is unpacked, and turns heat treatment；
Second step, spheroidising；
3rd step, turns cold work and cuts ring process；
4th step, High temperature diffusion processes；
5th step, normalized treatment；
6th step, temper.
A kind of H profile steel collars Technology for Heating Processing the most according to claim 1, it is characterised in that: second step, under the conditions of 770-790 DEG C, carry out spheroidising, the process time is 9-11 hour.
A kind of H profile steel collars Technology for Heating Processing the most according to claim 1, it is characterised in that: the 4th step, under the conditions of 1020-1060 DEG C, carry out High temperature diffusion process, the process time is 4-7 hour.
A kind of H profile steel collars Technology for Heating Processing the most according to claim 1, it is characterised in that: the 5th step, under the conditions of 900-920 DEG C, carry out normalized treatment, the process time is 4-6 hour.
A kind of H profile steel collars Technology for Heating Processing the most according to claim 1, it is characterised in that: the 6th step, under the conditions of 490-510 DEG C, carry out temper, process time 11-13 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625490.3A CN106011444A (en) | 2016-08-03 | 2016-08-03 | H-section steel roll collar heat treatment technology |
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| CN201610625490.3A CN106011444A (en) | 2016-08-03 | 2016-08-03 | H-section steel roll collar heat treatment technology |
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| CN201610625490.3A Pending CN106011444A (en) | 2016-08-03 | 2016-08-03 | H-section steel roll collar heat treatment technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108823392A (en) * | 2018-08-15 | 2018-11-16 | 成都三强轧辊股份有限公司 | A kind of wide diameter H profile steel collars heat treatment process |
| CN109802149A (en) * | 2019-03-19 | 2019-05-24 | 上海神力科技有限公司 | A kind of flexible graphite sheet material inside synusia direction-controlling method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108823392A (en) * | 2018-08-15 | 2018-11-16 | 成都三强轧辊股份有限公司 | A kind of wide diameter H profile steel collars heat treatment process |
| CN109802149A (en) * | 2019-03-19 | 2019-05-24 | 上海神力科技有限公司 | A kind of flexible graphite sheet material inside synusia direction-controlling method |
| CN109802149B (en) * | 2019-03-19 | 2023-07-21 | 上海神力科技有限公司 | Method for controlling direction of internal lamellar sheet of flexible graphite sheet |
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Application publication date: 20161012 |