CN114807757A - Die steel roll for large and medium channel steel finished product rack and casting process thereof - Google Patents
Die steel roll for large and medium channel steel finished product rack and casting process thereof Download PDFInfo
- Publication number
- CN114807757A CN114807757A CN202210437705.4A CN202210437705A CN114807757A CN 114807757 A CN114807757 A CN 114807757A CN 202210437705 A CN202210437705 A CN 202210437705A CN 114807757 A CN114807757 A CN 114807757A
- Authority
- CN
- China
- Prior art keywords
- steel
- roller
- molten steel
- roll
- finished product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 174
- 239000010959 steel Substances 0.000 title claims abstract description 174
- 238000005266 casting Methods 0.000 title claims abstract description 29
- 238000007670 refining Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 26
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 12
- 239000010436 fluorite Substances 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 12
- 150000002910 rare earth metals Chemical class 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000010955 niobium Substances 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 6
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 6
- 230000001914 calming effect Effects 0.000 claims description 4
- 238000005187 foaming Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- 239000012071 phase Substances 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 abstract description 17
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 9
- 229910001563 bainite Inorganic materials 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
-
- 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
- C21D1/28—Normalising
-
- 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
-
- 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
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
-
- 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
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a die steel roll for a large and medium channel steel finished product rack and a casting process thereof, wherein the die steel roll comprises a roll body, and the roll body comprises the following chemical components in percentage by mass: c: 1.40-1.60%, Si: 0.30-0.50%, Mn: 0.4-0.60%, Cr: 8.00-14.00%, Mo: 0.60-0.80%, V: 0.80-1.20%, Nb: 0.40-0.60%, more than or equal to 0.01% of Re, less than or equal to 0.03% of P, less than or equal to 0.025% of S, and the balance of Fe and inevitable impurities; the casting process comprises the following steps: smelting early-stage molten steel; slagging; refining the finished roll molten steel; then sampling, detecting and judging whether the chemical components are qualified or not; casting a blank roller; carrying out special heat treatment; and (5) detecting the roller technology. The invention has high hardness, good wear resistance, basically no hardness drop of the working layer, greatly improved impact toughness, tensile strength and hot cracking resistance, can meet the requirements of rolling operation of steel rolling enterprises, and prolongs the service life of the roller. The production efficiency of steel rolling enterprises is improved, and the aims of cost reduction and efficiency improvement are achieved.
Description
Technical Field
The invention belongs to the field of rollers, and particularly relates to a die steel roller for a large and medium channel steel finished product rack and a casting process thereof.
Background
The rolls used by the domestic hot rolling large and medium-sized channel steel finished product finish rolling stand mostly adopt pearlites, bainite nodular cast iron and various semi-steel rolls. Because the blank used for producing large and medium-sized channel steel has the characteristics of large specification, deep roll pass and large rolling extension pressure, and the market has higher and higher requirements on the rigidity and surface smoothness of the steel variety, the wear resistance, hardness fall, rolling impact toughness, tensile strength and thermal crack resistance of the finished roll are higher in order to achieve the aims.
The roller made of pearlite and bainite ductile iron has certain hardness drop and insufficient middle and later period capacity of tensile strength due to material factors. With the reduction of the roll diameter of the roll, under the operating environment with unchanged rolling load, the rolling yield can be reduced, oxidative heat cracks can also appear on the inner wall and the groove bottom of the roll pass, and the roll pass is expanded and extended, so that the phenomenon of stripping and block falling of the side edge of the pass is caused, and even the roll is broken, so that the roll fails in advance; although the semi-steel roller has basically no hardness drop compared with a ductile iron roller, the semi-steel roller has the same problems of the roller due to the contact with a high-temperature rolled piece for a long time, the influence of heat conduction and water cooling circulation reciprocation and the pass due to the existence of a small amount of flaky or net-shaped carbide due to the high content of carbide.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a die steel roll for a large and medium channel steel finished product rack and a casting process thereof.
The technical scheme of the invention is as follows: the die steel roll for the large and medium channel steel finished product rack comprises a roll body, wherein the roll body comprises the following chemical components in percentage by mass:
C 1.40-1.60%，
Si 0.30-0.50% ，
Mn 0.4-0.60%，
Cr 8.00-14.00%，
Mo 0.60-0.80%，
V 0.80-1.20%，
Nb 0.40-0.60% ，
Re≥0.01%，
P≤0.03%，
S≤0.025%，
the balance being Fe and unavoidable impurities.
Furthermore, the solid solution of niobium reduces the transformation temperature of alpha phase, reduces the growth speed of crystal grains, promotes the generation of low-temperature transformation products, further improves the density of the crystal grains when the molten steel of the roller is cooled and solidified, and changes the comprehensive performance of the substrate of the roller.
A casting process of a die steel roll for a large and medium channel steel finished product rack comprises the following steps:
A. molten steel in early stage of smelting
Smelting early-stage molten steel by using a medium-frequency induction furnace;
B. slagging
When the temperature of the molten steel is raised to a certain temperature, slagging is carried out;
C. molten steel for refining finished roller
Transferring the molten steel to an LF ladle refining furnace to refine finished roll molten steel;
D. then sampling and detecting to judge whether the chemical components are qualified
Sampling and detecting the chemical components of the molten steel of the finished roller, and continuing to perform the step E after the chemical components are qualified;
E. roll for casting blank
Tapping at the temperature of the molten steel reaching the liquid phase temperature and 60-80 ℃, and casting a blank roller after calming for 8-12 minutes;
F. performing special heat treatment
Carrying out special heat treatment on the blank roller to finally obtain a roller;
G. roll technical inspection
And carrying out technical detection on the obtained roller.
Furthermore, in the slagging process of the step B, a slagging agent is required to be added, and the slagging agent comprises 2.5kg of fluorite per ton of steel and 3.5kg of lime per ton of steel.
Furthermore, the slagging in the step B specifically comprises the following processes:
firstly, heating molten steel to a certain temperature;
then, adding a slag former into the molten steel;
then, continuously heating the molten steel;
then adding alloy which is not easy to oxidize into the heated molten steel;
and finally, slagging off after melting down.
Further, the step C of refining the finished product roller molten steel comprises foaming slag making, and the specific process comprises the following steps:
when refining in an LF ladle refining furnace, adding silicon carbide in batches to make foamed slag until the foamed slag is formed.
Further, the step C of refining the finished product roller molten steel comprises white slag making, and the specific process comprises the following steps:
after the foamed slag is formed, when the temperature of the molten steel is a certain temperature, fluorite is added to make white slag, and the white slag is heated after being kept for 20 minutes.
Further, step C, refining the finished product roller molten steel, which comprises removing P, S impurity elements, and comprises the following specific processes:
after the temperature of the molten steel is raised, yttrium-based heavy rare earth molten steel alterant is added, and P, S impurity elements are removed by using active elements in the rare earth.
Further, step F is subjected to a special heat treatment comprising the following processes:
firstly, carrying out diffusion annealing treatment;
then, spheroidizing;
then, normalizing;
and finally, tempering.
Further, the step G roll technology detection comprises hardness detection of the roll and tensile strength detection of the roll.
The invention has the following beneficial effects:
the invention has high hardness, good wear resistance, basically no hardness drop of the working layer, greatly improved impact toughness, tensile strength and heat crack resistance, can meet the requirements of rolling operation of steel rolling enterprises, and prolongs the service life of the roller. The production efficiency of steel rolling enterprises is improved, and the aims of cost reduction and efficiency improvement are achieved.
Drawings
FIG. 1 is a schematic view of the structure of a die steel roll according to the present invention.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
example one
As shown in fig. 1, the die steel roll for the large and medium channel steel finished product rack comprises a roll body, wherein the roll body comprises the following chemical components in percentage by mass:
C 1.40-1.60%，
Si 0.30-0.50% ，
Mn 0.4-0.60%，
Cr 8.00-14.00%，
Mo 0.60-0.80%，
V 0.80-1.20%，
Nb 0.40-0.60% ，
Re≥0.01%，
P≤0.03%，
S≤0.025%，
the balance being Fe and unavoidable impurities.
The solid solution of niobium reduces the transformation temperature of alpha phase, reduces the growth speed of crystal grains, promotes the generation of low-temperature transformation products, further improves the density of the crystal grains when the molten steel of the roller is cooled and solidified, and changes the comprehensive performance of the substrate of the roller.
A casting process of a die steel roll for a large and medium channel steel finished product rack comprises the following steps:
A. molten steel in early stage of smelting
Smelting early-stage molten steel by using a medium-frequency induction furnace;
B. slagging
When the temperature of the molten steel is raised to a certain temperature, slagging is carried out;
C. molten steel for refining finished roller
Transferring the molten steel to an LF ladle refining furnace to refine finished roll molten steel;
D. then sampling and detecting to judge whether the chemical components are qualified
Sampling and detecting the chemical components of the molten steel of the finished roller, and continuing to perform the step E after the chemical components are qualified;
E. roll for casting blank
Tapping at the temperature of the molten steel reaching the liquid phase temperature and 60-80 ℃, and casting a blank roller after calming for 8-12 minutes;
F. performing special heat treatment
Carrying out special heat treatment on the blank roller to finally obtain a roller;
G. roll technical inspection
And carrying out technical detection on the obtained roller.
And B, in the slagging process, a slagging agent is required to be added, wherein the slagging agent comprises 2.5kg of fluorite per ton of steel and 3.5kg of lime per ton of steel.
And B, slagging, which specifically comprises the following steps:
firstly, heating molten steel to a certain temperature;
then, adding a slag former into the molten steel;
then, continuously heating the molten steel;
then adding alloy which is not easy to oxidize into the heated molten steel;
and finally, slagging off after melting down.
Step C, refining the molten steel of the finished roller, which comprises foaming slag making, and comprises the following specific processes:
when refining in an LF ladle refining furnace, adding silicon carbide in batches to make foamed slag until the foamed slag is formed.
Step C, refining the molten steel of the finished roller, which comprises white slag making, and comprises the following specific processes:
after the foamed slag is formed, when the temperature of the molten steel is a certain temperature, fluorite is added to make white slag, and the white slag is heated after being kept for 20 minutes.
Step C, refining the molten steel of the finished roller, which comprises removing P, S impurity elements, and comprises the following specific processes:
after the temperature of the molten steel is raised, yttrium-based heavy rare earth molten steel alterant is added, and P, S impurity elements are removed by using active elements in the rare earth.
Step F, carrying out special heat treatment, comprising the following steps:
firstly, carrying out diffusion annealing treatment;
then, spheroidizing;
then, normalizing;
and finally, tempering.
And G, detecting the roller technology, including detecting the hardness of the roller and detecting the tensile strength of the roller.
Specifically, molten steel at the early stage of smelting in a medium-frequency induction furnace is utilized, the steel temperature reaches 1460-plus-one-ton 1480 ℃ for slagging, the slagging agent comprises fluorite 2.5 kg/ton steel and lime 3.5 kg/ton steel, then alloy which is not easy to oxidize is added when the temperature is raised to 1500-plus-one-ton 1520 ℃, slagging is carried out after melting down, and then the molten steel is discharged to an LF ladle refining furnace for refining finished product roller molten steel.
Specifically, step C is to refine the molten steel of the finished roll, and the specific process is as follows:
when refining in an LF ladle refining furnace, adding silicon carbide in batches with the addition amount of 3-5 kg/ton steel, making foam slag, after the foam slag is formed, adding fluorite 2.5 kg/ton steel and white slag when the molten steel temperature is more than or equal to 1500 ℃, heating after the white slag is kept for 20 minutes, adding yttrium-based heavy rare earth molten steel alterant when the molten steel temperature reaches 1520 + 1540 ℃, removing impurity elements such as P, S and the like by utilizing active elements in rare earth, simultaneously adding other easily-oxidizable elements such as vanadium and the like, and sampling and fine-tuning alloy elements after melting down.
It is noted that the LF refining process is completely blown with Ar gas. 0.03%/ton steel aluminum cake is inserted for deoxidation 5-10 minutes before tapping.
Specifically, the special heat treatment in step F includes the following steps:
diffusion annealing treatment
Diffusion annealing, eliminating casting stress, opening the roller by adopting a hot box opening process, opening the roller when the roller temperature reaches 550-.
Spheroidizing treatment
The spheroidization process mainly refines the crystal grains of the roller, improves the compactness, obtains a spherical structure, has the temperature rise speed of 15-20 ℃/h, the roller temperature of 760 ℃ and 820 ℃ for heat preservation, the heat preservation time of 15-30 hours, then the furnace cooling is carried out, the cooling speed is 30 ℃/h, and the roller temperature is 500 ℃ and then the roller is taken out of the furnace for air cooling.
Normalizing treatment
And (3) heating the roller after entering a furnace, wherein the temperature is increased by 10 ℃/h, the roller is accelerated to 15 ℃/h after the roller temperature reaches 450-.
Tempering treatment
The roller is heated up at the speed of 10 ℃/h and kept warm for 6-10 hours when the roller temperature reaches 550 ℃ plus 560 ℃, and then the roller is cooled down in the furnace to 100 ℃ and then is taken out of the furnace for processing.
Technical index of roller
The hardness of the roll surface of the roll is 65-70HSD, the hardness fall from the working surface to the groove bottom of the hole pattern is less than or equal to 2HSD, and the hardness of the roll neck is 42-46 HSD.
The tensile strength of the roller is more than or equal to 650 Mpa.
And (3) roller metallographic matrix structure: fine grained special metal carbide + tempered sorbite + bainite.
Example two
As shown in fig. 1, the die steel roll for the large and medium channel steel finished product rack comprises a roll body, wherein the roll body comprises the following chemical components in percentage by mass:
C 1.40-1.60%，
Si 0.30-0.50% ，
Mn 0.4-0.60%，
Cr 8.00-14.00%，
Mo 0.60-0.80%，
V 0.80-1.20%，
Nb 0.50% ，
Re≥0.01%，
P≤0.03%，
S≤0.025%，
the balance being Fe and unavoidable impurities.
The solid solution of niobium reduces the transformation temperature of alpha phase, reduces the growth speed of crystal grains, promotes the generation of low-temperature transformation products, further improves the density of the crystal grains when the molten steel of the roller is cooled and solidified, and changes the comprehensive performance of the substrate of the roller.
A casting process of a die steel roll for a large and medium channel steel finished product rack comprises the following steps:
A. molten steel in early stage of smelting
Smelting early-stage molten steel by using a medium-frequency induction furnace;
B. slagging
When the temperature of the molten steel is raised to a certain temperature, slagging is carried out;
C. molten steel for refining finished roller
Transferring the molten steel to an LF ladle refining furnace to refine finished roll molten steel;
D. then sampling and detecting to judge whether the chemical components are qualified
Sampling and detecting the chemical components of the molten steel of the finished roller, and continuing to perform the step E after the chemical components are qualified;
E. roll for casting blank
Tapping at the temperature of the molten steel reaching the liquid phase temperature and 60-80 ℃, and casting a blank roller after calming for 8-12 minutes;
F. performing special heat treatment
Carrying out special heat treatment on the blank roller to finally obtain a roller;
G. roll technical inspection
And carrying out technical detection on the obtained roller.
And B, in the slagging process, a slagging agent is required to be added, wherein the slagging agent comprises 2.5kg of fluorite per ton of steel and 3.5kg of lime per ton of steel.
And B, slagging, which specifically comprises the following steps:
firstly, heating molten steel to a certain temperature;
then, adding a slag former into the molten steel;
then, continuously heating the molten steel;
then adding alloy which is not easy to oxidize into the heated molten steel;
and finally, slagging off after melting down.
Step C, refining the molten steel of the finished roller, which comprises foaming slag making, and comprises the following specific processes:
when refining is carried out in an LF ladle refining furnace, silicon carbide is added in batches to make foamed slag until the foamed slag is formed.
Step C, refining the molten steel of the finished roller, which comprises white slag making, and comprises the following specific processes:
after the foamed slag is formed, when the temperature of the molten steel is a certain temperature, fluorite is added to make white slag, and the white slag is heated after being kept for 20 minutes.
Step C, refining the molten steel of the finished roller, which comprises removing P, S impurity elements, and comprises the following specific processes:
after the temperature of the molten steel is raised, yttrium-based heavy rare earth molten steel alterant is added, and P, S impurity elements are removed by using active elements in the rare earth.
Step F, carrying out special heat treatment, comprising the following steps:
firstly, carrying out diffusion annealing treatment;
then, spheroidizing;
then, normalizing;
and finally, tempering.
And G, detecting the roller technology, including detecting the hardness of the roller and detecting the tensile strength of the roller.
Specifically, molten steel at the early stage of smelting in a medium-frequency induction furnace is utilized, the steel temperature reaches 1460-plus-one-ton 1480 ℃ for slagging, the slagging agent comprises fluorite 2.5 kg/ton steel and lime 3.5 kg/ton steel, then alloy which is not easy to oxidize is added when the temperature is raised to 1500-plus-one-ton 1520 ℃, slagging is carried out after melting down, and then the molten steel is discharged to an LF ladle refining furnace for refining finished product roller molten steel.
Specifically, step C is to refine the molten steel of the finished roll, and the specific process is as follows:
when refining in an LF ladle refining furnace, adding silicon carbide in batches with the addition amount of 3-5 kg/ton steel, making foam slag, after the foam slag is formed, adding fluorite 2.5 kg/ton steel and white slag when the molten steel temperature is more than or equal to 1500 ℃, heating after the white slag is kept for 20 minutes, adding yttrium-based heavy rare earth molten steel alterant when the molten steel temperature reaches 1520 + 1540 ℃, removing impurity elements such as P, S and the like by utilizing active elements in rare earth, simultaneously adding other easily-oxidizable elements such as vanadium and the like, and sampling and fine-tuning alloy elements after melting down.
It is noted that the LF refining process is completely blown with Ar gas. 0.03%/ton steel aluminum cake is inserted for deoxidation 5-10 minutes before tapping.
Specifically, the special heat treatment in step F includes the following steps:
diffusion annealing treatment
Diffusion annealing, eliminating casting stress, adopting a hot box opening process for the roller, opening the box when the roller temperature reaches 650 ℃, placing the roller into a bench resistance furnace preheated to the same temperature for heat treatment at a heating speed of 10 ℃/h, preserving heat when the roller temperature reaches 660-plus-minus 680 ℃, preserving heat for 6-10 hours, then heating at a heating speed of 15 ℃/h until the roller temperature reaches 1050-plus-minus 1100 ℃, preserving heat for every 25mm/h, and then air-cooling the roller on a trolley to 480 ℃ and entering the furnace.
Spheroidizing treatment
The spheroidization process mainly refines the crystal grains of the roller, improves the compactness, obtains a spherical structure, has the temperature rise speed of 15-20 ℃/h, the roller temperature of 760 ℃ and 820 ℃ for heat preservation, the heat preservation time of 15-30 hours, then the furnace cooling is carried out, the cooling speed is 30 ℃/h, and the roller temperature is 500 ℃ and then the roller is taken out of the furnace for air cooling.
Normalizing treatment
And (3) heating the roller after entering a furnace, wherein the temperature is increased by 10 ℃/h, the roller is accelerated to 15 ℃/h after the roller temperature reaches 450-.
Tempering treatment
Keeping the temperature of the roller constant for 5-8 hours after the roller enters the furnace, then heating up at the heating rate of 10 ℃/h, keeping the temperature for 6-10 hours when the roller temperature reaches 550 ℃ and 560 ℃, then cooling the roller in the furnace to 100 ℃, and then discharging the roller out of the furnace for processing.
Technical index of roller
The hardness of the roll surface of the roll is 65-70HSD, the hardness drop from the working surface to the groove bottom of the hole pattern is less than or equal to 2HSD, and the hardness of the roll neck is 42-46 HSD.
The tensile strength of the roller is more than or equal to 650 Mpa.
And (3) roller metallographic matrix structure: fine grained special metal carbide + tempered sorbite + bainite.
The 2 pairs of new product rollers which are researched and developed are respectively used in a continuous rolling unit and a horizontal unit finish rolling finished product rack, the rolling quantity is more than 3200 tons/time, the grinding quantity is increased by 56 percent compared with the traditional rollers, the grinding quantity is small, the grinding times are increased by 2-3 times, and the new product rollers obtain better use benefit and social benefit.
The invention has high hardness, good wear resistance, basically no hardness drop of the working layer, greatly improved impact toughness, tensile strength and hot cracking resistance, can meet the requirements of rolling operation of steel rolling enterprises, and prolongs the service life of the roller. The production efficiency of steel rolling enterprises is improved, and the aims of cost reduction and efficiency improvement are achieved.
Claims (10)
1. The utility model provides a big-and-middle-sized channel-section steel finished product mould steel roll for frame which characterized in that: the roller comprises a roller body, and the roller body comprises the following chemical components in percentage by mass:
C 1.40-1.60%，
Si 0.30-0.50% ，
Mn 0.4-0.60%，
Cr 8.00-14.00%，
Mo 0.60-0.80%，
V 0.80-1.20%，
Nb 0.40-0.60% ，
Re≥0.01%，
P≤0.03%，
S≤0.025%，
the balance being Fe and unavoidable impurities.
2. The die steel roll for the large and medium channel steel finished product rack as claimed in claim 1, wherein: the solid solution of niobium reduces the transformation temperature of alpha phase, reduces the growth speed of crystal grains, promotes the generation of low-temperature transformation products, further improves the density of the crystal grains when the molten steel of the roller is cooled and solidified, and changes the comprehensive performance of the substrate of the roller.
3. The casting process of the die steel roll for the large and medium-sized channel steel finished product rack is characterized in that: the method comprises the following steps:
(A) molten steel in early stage of smelting
Smelting early-stage molten steel by using a medium-frequency induction furnace;
(B) slagging
When the temperature of the molten steel is raised to a certain temperature, slagging is carried out;
(C) molten steel for refining finished roller
Transferring the molten steel to an LF ladle refining furnace to refine finished roll molten steel;
(D) then sampling and detecting to judge whether the chemical components are qualified
Sampling and detecting the chemical components of the molten steel of the finished roller, and continuing to perform the step (E) after the chemical components are qualified;
(E) roll for casting blank
Tapping at the temperature of the molten steel reaching the liquid phase temperature and 60-80 ℃, and casting a blank roller after calming for 8-12 minutes;
(F) performing special heat treatment
Carrying out special heat treatment on the blank roller to finally obtain a roller;
(G) roll technical inspection
And carrying out technical detection on the obtained roller.
4. The casting process of the die steel roll for the large and medium channel steel finished product rack as claimed in claim 3, wherein the die steel roll comprises the following steps: in the slagging process in the step (B), a slagging agent is required to be added, and the slagging agent comprises 2.5kg of fluorite per ton of steel and 3.5kg of lime per ton of steel.
5. The casting process of the die steel roll for the large and medium channel steel finished product rack as claimed in claim 3, wherein the die steel roll comprises the following steps: slagging in the step (B), which comprises the following steps:
firstly, heating molten steel to a certain temperature;
then, adding a slag former into the molten steel;
then, continuously heating the molten steel;
then adding alloy which is not easy to oxidize into the heated molten steel;
and finally, slagging off after melting down.
6. The casting process of the die steel roll for the large and medium channel steel finished product rack as claimed in claim 3, wherein the die steel roll comprises the following steps: step (C) refining the molten steel of the finished roller, which comprises foaming slag making and comprises the following specific processes:
when refining in an LF ladle refining furnace, adding silicon carbide in batches to make foamed slag until the foamed slag is formed.
7. The casting process of the die steel roll for the large and medium-sized channel steel finished product rack as claimed in claim 6, wherein the casting process comprises the following steps: step (C) refining the molten steel of the finished roller, which comprises white slag making and comprises the following specific processes:
after the foamed slag is formed, when the temperature of the molten steel is a certain temperature, fluorite is added to make white slag, and the white slag is heated after being kept for 20 minutes.
8. The casting process of the die steel roll for the large and medium channel steel finished product rack as claimed in claim 7, wherein the die steel roll comprises the following steps: step (C) refining the molten steel of the finished roller, which comprises removing P, S impurity elements, and comprises the following specific processes:
after the temperature of the molten steel is raised, yttrium-based heavy rare earth molten steel alterant is added, and P, S impurity elements are removed by using active elements in the rare earth.
9. The casting process of the die steel roll for the large and medium channel steel finished product rack as claimed in claim 3, wherein the die steel roll comprises the following steps: step (F) of performing a special heat treatment, comprising the steps of:
firstly, carrying out diffusion annealing treatment;
then, spheroidizing;
then, normalizing;
and finally, tempering.
10. The casting process of the die steel roll for the large and medium channel steel finished product rack as claimed in claim 3, wherein the die steel roll comprises the following steps: and (G) detecting the roller technology, wherein the detection comprises the hardness detection of the roller and the tensile strength detection of the roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210437705.4A CN114807757A (en) | 2022-04-25 | 2022-04-25 | Die steel roll for large and medium channel steel finished product rack and casting process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210437705.4A CN114807757A (en) | 2022-04-25 | 2022-04-25 | Die steel roll for large and medium channel steel finished product rack and casting process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114807757A true CN114807757A (en) | 2022-07-29 |
Family
ID=82506643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210437705.4A Pending CN114807757A (en) | 2022-04-25 | 2022-04-25 | Die steel roll for large and medium channel steel finished product rack and casting process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114807757A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127119A (en) * | 2023-10-24 | 2023-11-28 | 成都先进金属材料产业技术研究院股份有限公司 | Mould steel billet and continuous casting method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938091A (en) * | 2014-04-28 | 2014-07-23 | 钢铁研究总院 | High-toughness and high-wear-resistant cold-work die steel |
| CN106825053A (en) * | 2016-12-29 | 2017-06-13 | 常州凯达重工科技有限公司 | A kind of high-speed steel shaped steel polishing roll and preparation method thereof |
| EP3428300A1 (en) * | 2017-07-10 | 2019-01-16 | Saar-Pulvermetall GmbH | Roller for a grinding or/and pressing device, in particular compression roller for a press for the production of pellets, and method of manufacturing the roller |
| CN109266988A (en) * | 2018-11-20 | 2019-01-25 | 王茂庭 | A kind of sinking roller and stabilizing roller |
| CN110257706A (en) * | 2019-07-03 | 2019-09-20 | 常州市中宇合金轧辊厂 | Trough of belt casting die steel welded still pipe cold roll and its processing technology |
| CN111790755A (en) * | 2020-06-19 | 2020-10-20 | 常州市瑞宏轧辊有限公司 | Improved chromium alloy section steel finished product roller and manufacturing method thereof |
| CN112725708A (en) * | 2020-12-01 | 2021-04-30 | 邢台德龙机械轧辊有限公司 | Preparation method of roller for rough rolling of die steel medium plate |
| CN112743064A (en) * | 2020-12-29 | 2021-05-04 | 唐山先隆轧辊实业有限公司 | High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof |
| CN112792304A (en) * | 2020-12-07 | 2021-05-14 | 邢台德龙机械轧辊有限公司 | Preparation method of large chromium alloy strip steel supporting roll |
| WO2021169621A1 (en) * | 2020-02-27 | 2021-09-02 | 江阴兴澄特种钢铁有限公司 | Pre-hardened mirror mold steel plate and manufacturing method therefor |
| CN114351032A (en) * | 2021-12-21 | 2022-04-15 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-material vertical roll |
-
2022
- 2022-04-25 CN CN202210437705.4A patent/CN114807757A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938091A (en) * | 2014-04-28 | 2014-07-23 | 钢铁研究总院 | High-toughness and high-wear-resistant cold-work die steel |
| CN106825053A (en) * | 2016-12-29 | 2017-06-13 | 常州凯达重工科技有限公司 | A kind of high-speed steel shaped steel polishing roll and preparation method thereof |
| EP3428300A1 (en) * | 2017-07-10 | 2019-01-16 | Saar-Pulvermetall GmbH | Roller for a grinding or/and pressing device, in particular compression roller for a press for the production of pellets, and method of manufacturing the roller |
| CN109266988A (en) * | 2018-11-20 | 2019-01-25 | 王茂庭 | A kind of sinking roller and stabilizing roller |
| CN110257706A (en) * | 2019-07-03 | 2019-09-20 | 常州市中宇合金轧辊厂 | Trough of belt casting die steel welded still pipe cold roll and its processing technology |
| WO2021169621A1 (en) * | 2020-02-27 | 2021-09-02 | 江阴兴澄特种钢铁有限公司 | Pre-hardened mirror mold steel plate and manufacturing method therefor |
| CN111790755A (en) * | 2020-06-19 | 2020-10-20 | 常州市瑞宏轧辊有限公司 | Improved chromium alloy section steel finished product roller and manufacturing method thereof |
| CN112725708A (en) * | 2020-12-01 | 2021-04-30 | 邢台德龙机械轧辊有限公司 | Preparation method of roller for rough rolling of die steel medium plate |
| CN112792304A (en) * | 2020-12-07 | 2021-05-14 | 邢台德龙机械轧辊有限公司 | Preparation method of large chromium alloy strip steel supporting roll |
| CN112743064A (en) * | 2020-12-29 | 2021-05-04 | 唐山先隆轧辊实业有限公司 | High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof |
| CN114351032A (en) * | 2021-12-21 | 2022-04-15 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-material vertical roll |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127119A (en) * | 2023-10-24 | 2023-11-28 | 成都先进金属材料产业技术研究院股份有限公司 | Mould steel billet and continuous casting method thereof |
| CN117127119B (en) * | 2023-10-24 | 2024-01-23 | 成都先进金属材料产业技术研究院股份有限公司 | Mould steel billet and continuous casting method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110157988B (en) | Steel alloy material for high-purity homogeneous rare earth cold roll and preparation method thereof | |
| US20160230247A1 (en) | Non quenched and tempered steel and manufacturing process thereof | |
| US20160215358A1 (en) | Non quenched and tempered steel and manufacturing process thereof | |
| CN103540838A (en) | Steel plate for low-temperature vessel and production method thereof | |
| CN102899460A (en) | Heat treatment method for martensitic stainless steel forging module | |
| CN107794451B (en) | A kind of plastic die steel 718 and its production technology | |
| CN101905244B (en) | Method for producing mandrel by utilizing 28NiCrMoV steel as raw material | |
| CN103469092A (en) | Production method for main shaft of fan by using 34CrNiMo6 steel as raw material | |
| CN107177796A (en) | 100 260mm thickness quenched and tempered state pre-hardening plastic steel plate for die and its manufacture method | |
| CN112981232B (en) | 12Cr2Mo1VR steel plate with low compression ratio and high flaw detection quality requirement for continuous casting billet finished product and production process thereof | |
| CN103014511A (en) | High-obdurability cold-work die steel and processing method thereof | |
| CN102876997B (en) | Easy-welding tempering high-strength steel plate for ocean platform and production method thereof | |
| CN113817967A (en) | Hot-delivery hot-charging production method for reducing depth of decarburized layer of bearing steel round steel | |
| CN105018862A (en) | High-toughness steel plate 140 mm thick and manufacturing method thereof | |
| CN110964973B (en) | High-manganese CADI and heat treatment method thereof | |
| CN109321834A (en) | To roll generation forging production 200mm thickness bearing of straightening machine seat 40Cr steel plate and production technology | |
| CN105969963A (en) | Production method of alloy structural steel plate for lifting equipment rail | |
| CN116179967A (en) | Material for thrust wheel axle and preparation method thereof | |
| CN105256225A (en) | Cold-rolled steel plate for elevator and preparation method for cold-rolled steel plate | |
| CN114807757A (en) | Die steel roll for large and medium channel steel finished product rack and casting process thereof | |
| CN111790755A (en) | Improved chromium alloy section steel finished product roller and manufacturing method thereof | |
| CN111074156A (en) | Ultrahigh-strength steel plate with excellent low-temperature toughness and production method thereof | |
| CN110512151A (en) | A kind of rare earth NM450 Wide and Heavy Plates and its production method | |
| CN116334483A (en) | Reducing roller collar based on steel tube rolling mill and manufacturing method thereof | |
| CN110565027A (en) | Steel plate with ultrahigh hardness and excellent low-temperature toughness and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220729 |