CN116987965A - High-alloy forged steel hot-rolled R1 working roll and preparation method thereof - Google Patents
High-alloy forged steel hot-rolled R1 working roll and preparation method thereof Download PDFInfo
- Publication number
- CN116987965A CN116987965A CN202310878605.XA CN202310878605A CN116987965A CN 116987965 A CN116987965 A CN 116987965A CN 202310878605 A CN202310878605 A CN 202310878605A CN 116987965 A CN116987965 A CN 116987965A
- Authority
- CN
- China
- Prior art keywords
- working roll
- hot rolling
- equal
- refining
- less
- 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 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 239000000956 alloy Substances 0.000 title claims abstract description 52
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000005096 rolling process Methods 0.000 title description 7
- 238000005098 hot rolling Methods 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 35
- 238000007670 refining Methods 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 29
- 238000005242 forging Methods 0.000 claims description 22
- 238000005496 tempering Methods 0.000 claims description 20
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 17
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 16
- 229910000805 Pig iron Inorganic materials 0.000 claims description 14
- 238000009849 vacuum degassing Methods 0.000 claims description 13
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 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 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006032 tissue transformation Effects 0.000 description 1
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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master 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
- C22C38/04—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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 Steel (AREA)
Abstract
The invention discloses a high alloy forged steel hot rolling R1 working roll and a preparation method thereof, wherein the high alloy forged steel hot rolling R1 working roll comprises the following chemical components: c:0.3-0.7%, si:0.4-0.8%, mn:0.4-0.8%, cr:3.5-4.5%, ni:0.4-0.8%, mo:0.4-0.8%, V:0.05-0.25%, nb:0.001-0.2%, cu less than or equal to 0.3%, H less than or equal to 2ppm, O less than or equal to 15ppm, N less than or equal to 70ppm, P and S less than or equal to 0.025%, and Fe and unavoidable impurities as the rest. Thereby improving the safety coefficient and the on-machine service cycle of the hot rolling working roll and improving the applicability of the working roll.
Description
Technical Field
The invention relates to the field of manufacturing of high alloy forged steel rolls, in particular to a high alloy forged steel hot rolling R1 working roll and a preparation method thereof.
Background
Because of the severe working environment, the hot continuous rolling R1 working roll is usually made of casting roll materials with better hot cracking resistance such as composite tool steel. However, the casting roller is easy to have rolling accidents of roll neck fracture due to low roll neck strength. The strength of the roll neck of the forged steel roll is higher than that of a casting roll, the conventional forged steel material is a 60CrMnMo alloy forged steel material, the strength of the roll neck is greatly improved than that of the casting roll, but the fatigue resistance and the hot cracking resistance of the roll are poor due to low alloy content, the on-machine service cycle of the roll is short, and the working efficiency of a rolling mill is seriously influenced.
Therefore, development of a forged steel material special for rough rolling working rolls with good service performance and high roll neck strength is urgently needed, and service life and rolling performance of R1 working rolls are improved.
Disclosure of Invention
The invention aims to solve the technical problems of providing a high alloy forged steel hot rolling R1 working roll and a preparation method thereof, wherein the hot cracking resistance and the thermal fatigue performance of the hot rolling working roll are improved, the hardness of the roll body is improved, and the wear resistance of the roll is improved by optimizing the component proportion and the production process. Thereby improving the safety coefficient and the on-machine service cycle of the hot rolling working roll and improving the applicability of the working roll.
In order to solve the technical problems, the invention adopts the following technical scheme: a high alloy wrought steel hot rolling R1 work roll, the high alloy wrought steel hot rolling R1 work roll comprising the following chemical components: c:0.3-0.7%, si:0.4-0.8%, mn:0.4-0.8%, cr:3.5-4.5%, ni:0.4-0.8%, mo:0.4-0.8%, V:0.05-0.25%, nb:0.001-0.2%, cu less than or equal to 0.3%, H less than or equal to 2ppm, O less than or equal to 15ppm, N less than or equal to 70ppm, P and S less than or equal to 0.025%, and Fe and unavoidable impurities as the rest.
A preparation method of a high alloy forged steel hot rolling R1 working roll comprises the following steps:
s1, selecting scrap steel, pig iron and alloy materials which meet the chemical composition requirements of a finished product as furnace charges;
s2, primary refining is carried out on the scrap steel and pig iron selected in the step S1 by adopting an electric arc furnace oxidation method;
s3, after primary refining of scrap steel and pig iron, transferring the primary refining of the scrap steel and the pig iron into an LF refining furnace, performing white slag operation in the whole LF refining process, adding alloy materials in batches, and adding micro-alloy element ferroniobium in different positions of molten steel in batches at the end of refining;
s4, after LF refining is completed, heating and then performing VD vacuum degassing operation in a VD vacuum degassing furnace;
s6, heating after vacuum degassing by VD, and then adopting a large taper ingot mould to carry out ladle hanging casting;
s7, after demolding, transferring the steel ingot to a forging factory, and forging a high alloy forged steel hot rolling R1 working roll blank by adopting a near-net forging process;
s8, performing preliminary heat treatment, namely annealing and tempering;
s9, performing performance heat treatment, namely performing industrial frequency integral quenching and tempering, wherein the quenching temperature is 900-950 ℃ and the tempering temperature is 400-500 ℃;
and step S10, performing performance detection on the forging after the twice heat treatment is completed.
The technical scheme of the invention is further improved as follows: and in the step S2, P is ensured to be less than or equal to 0.01 percent before tapping.
The technical scheme of the invention is further improved as follows: and in the step S3, the single adding amount of the micro-alloy element ferroniobium is not more than 0.10kg/t molten steel, and the adding positions of the micro-alloy element ferroniobium are uniformly distributed on the surface of the molten steel.
The technical scheme of the invention is further improved as follows: and in the step S7, the shape of the high alloy forged steel hot rolling R1 working roll blank is similar to that of a finished product, and the machining allowance of the unilateral roll blank is not more than 15mm.
By adopting the technical scheme, the invention has the following technical progress:
1. compared with alloy cast steel and alloy forged steel, the alloy content is increased, especially the red hardness element content such as Mo, V and the like is greatly increased, the carbide type and content in the structure are increased, and the matrix strength is further enhanced by adding the microalloy element Nb. The strength and fatigue resistance of the roll neck are obviously improved;
2. according to the invention, the microalloying element ferrocolumbium is added to carry out microalloying treatment on the structure in the molten steel solidification process, so that the wear resistance and the thermal fatigue performance of the roller are improved;
3. the process method adopts a near-net forging method in the forging process, the blank shape is extremely similar to the shape of a finished product, the processing allowance of the blank is reduced, and the excellent structure of the outer layer of the roller blank is reserved to the maximum extent;
4. the forged steel R1 working roll produced by the process method provided by the invention has 100% qualified flaw detection, and the hardness meets the user requirement.
Detailed Description
The invention is further illustrated by the following examples:
a high alloy wrought steel hot rolling R1 work roll, the high alloy wrought steel hot rolling R1 work roll comprising the following chemical components: c:0.3-0.7%, si:0.4-0.8%, mn:0.4-0.8%, cr:3.5-4.5%, ni:0.4-0.8%, mo:0.4-0.8%, V:0.05-0.25%, nb:0.001-0.2%, cu less than or equal to 0.3%, H less than or equal to 2ppm, O less than or equal to 15ppm, N less than or equal to 70ppm, P and S less than or equal to 0.025%, and Fe and unavoidable impurities as the rest.
A preparation method of a high alloy forged steel hot rolling R1 working roll comprises the following steps:
s1, selecting scrap steel, pig iron and alloy materials which meet the chemical composition requirements of a finished product as furnace charges;
s2, primary refining is carried out on the scrap steel and pig iron selected in the step S1 by adopting an electric arc furnace oxidation method, and P is ensured to be less than or equal to 0.01 percent before tapping. In order to ensure that the P content in the finished product is below 0.025 percent, the P content is lower than the requirement of the finished product when tapping in an electric furnace, because the P content is increased by adding alloy in the refining process, but the P cannot be removed in the refining process;
s3, after primary smelting of scrap steel and pig iron, transferring the scrap steel and pig iron into an LF refining furnace, performing white slag operation in the whole LF refining process, adding alloy materials in batches, and adding micro-alloy element ferroniobium in batches at different positions of molten steel at the final smelting stage to ensure that Nb element can be uniformly distributed in the molten steel, wherein the single adding amount of the micro-alloy element ferroniobium is not more than 0.10kg/t of molten steel, and the adding positions of the micro-alloy element ferroniobium are uniformly distributed on the surface of the molten steel;
s4, after LF refining is completed, heating and then performing VD vacuum degassing operation in a VD vacuum degassing furnace;
s6, heating after vacuum degassing by VD, and then adopting a large-taper ingot mould with the taper of more than 10% to carry out ladle hanging casting;
s7, after demolding, transferring the steel ingot to a forging factory, forging a blank by adopting a near-net forging method, wherein the blank is similar to a finished product in shape, particularly, the R1 working roll with a conical main journal is also required to be forged into a conical shape, so that the machining allowance of a unilateral blank is ensured not to exceed 15mm, and the excellent structure of the outer layer of the roll blank is reserved to the maximum extent;
s8, performing preliminary heat treatment, namely annealing, tempering and refining grains; the preparation heat treatment is to heat the whole forging roller blank integrally, and improve the structure of the roller blank by integral water quenching or spray quenching, and the main purpose is to provide a good machining performance and a good structure form for subsequent machining and final heat treatment, wherein the common preparation heat treatment is thermal refining and the structure is tempered sorbite.
S9, performing performance heat treatment, namely performing industrial frequency integral quenching and tempering, wherein the quenching temperature is 900-950 ℃, and the tempering temperature is 400-500 ℃, so that uniform and consistent tissues are obtained after quenching; the performance heat treatment is to quench the working layer, heat the working layer by induction heating, and cool the working layer by spraying water, so as to obtain the structure mainly comprising martensite, and the aim of quenching is to increase the strength and hardness of the working layer.
And step S10, performing performance detection on the forging after the twice heat treatment is completed.
Example 1
The step S1, the rotor body forging comprises the following components: c:0.3%, si:0.4%, mn:0.4%, cr:3.5%, ni:0.4%, mo:0.4%, V:0.06%, nb:0.001%, cu:0.20% [ H ]:1.2ppm, [ O ]:10ppm, [ N ]:63ppm, P:0.015%, S:0.005%, the balance being Fe and unavoidable impurities.
S2, carefully selecting furnace charges, namely, using scrap steel, pig iron and alloy materials, and prohibiting the non-pure furnace charges from entering the furnace; the residual elements of scrap steel, pig iron and alloy materials meet the chemical composition requirements of finished products, and particularly harmful elements P, sn and Sb affecting the performance are controlled;
step S3, electric furnace smelting by an oxidation method: adopting an electric arc furnace oxidation method to carry out primary smelting of molten steel; the endpoint before tapping ensures that P is 0.009%;
step S4, LF refining: after molten steel smelting is completed, the molten steel is transferred into an LF refining furnace, the LF refining furnace is cleaned before use, no residual steel and residues exist, and the whole tapping process strictly prevents slag discharging. The method has the advantages that the white slag operation in the whole LF refining process is carried out, alloy materials are added in batches according to the requirements of target components, the refining time is prolonged, slag forming batches are increased, the purity of molten steel is improved, and the fact that harmful elements meet the process requirements is ensured; and adding ferroniobium in batches according to the alloy quantity of 0.02kg/t molten steel added at a single time at the end of refining, and respectively adding ferroniobium according to the diameter of a refining ladle at a position not lower than 5 positions to ensure that the alloy materials are uniformly distributed, wherein the ferroniobium is added for 5 times in total.
Step S5, VD vacuum degassing: after LF refining is finished, performing VD vacuum degassing operation in a VD vacuum degassing furnace;
s6, after vacuum degassing by VD, pouring by adopting a large-taper ingot mould crane ladle with the taper of 12.5%;
s7, after demolding, transferring the steel ingot to a forging factory, forging a blank by adopting a near-net forging method, wherein a main journal of a working roll is conical, and forging the forging blank according to the conical shape, wherein the machining allowance of a single-side blank is 12mm;
s8, carrying out preliminary heat treatment, wherein annealing and tempering are adopted in the preliminary heat treatment, and grains are refined;
s9, performing performance heat treatment; the performance heat treatment adopts industrial frequency integral quenching and tempering, the quenching temperature is 940 ℃, and the tempering temperature is 430 ℃, so that uniform and consistent tissues are obtained after quenching;
and step S10, performing performance detection on the forging after the twice heat treatment is completed.
Example 2
This example differs from example 1 in that the composition of the R1 work rolls is as follows: c:0.7%, si:0.8%, mn:0.8%, cr:4.5%, ni:0.8%, mo:0.8%, V:0.17%, nb:0.1%, cu:0.10% [ H ]:1.2ppm, [ O ]:12ppm, [ N ]:45ppm, P:0.015%, S:0.005% Fe and the balance of unavoidable impurities; the single adding amount of ferrocolumbium at the end of refining is 0.4kg/t molten steel; the quenching temperature of the performance heat treatment is 930 ℃, and the tempering temperature is 450 ℃.
Example 3
This example differs from example 1 in that the composition of the R1 work rolls is as follows: c:0.59%, si:0.78%, mn:0.76%, cr:4.4%, ni:0.77%, mo:0.75%, V:0.23%, nb:0.2%, cu:0.15% [ H ]:1.5ppm, [ O ]:15ppm, [ N ]:58ppm, P:0.013%, S:0.007%, the balance being Fe and unavoidable impurities; the single adding amount of ferrocolumbium at the end of refining is 0.7kg/t molten steel; the quenching temperature of the performance heat treatment is 920 ℃, and the tempering temperature is 470 ℃.
Comparative example 1
This example differs from example 1 in the composition Mo of the R1 work rolls: 0.3%
Comparative example 2
This example differs from example 1 in that the composition of the R1 work rolls V:0.03%
Comparative example 3
This example differs from example 1 in that the composition of the R1 work rolls is Nb:0.3%.
Comparative example 4
This example differs from example 1 in that the composition of the R1 work rolls is Nb:0.0005%.
Comparative example 5
The difference from example 1 is that no ferrocolumbium is added.
Example 6
The difference from example 1 is that the preliminary heat treatment mode is normalizing+tempering.
The products of examples 1 to 3 and comparative examples 1 to 6 were subjected to test sample mechanical properties, basic property detection and ultrasonic flaw detection, the mechanical property detection was performed in national standard GB/T228, the ultrasonic flaw detection was performed in JB/T3733, and the detection results are shown in Table 1.
Table 1 results of product property tests of examples
Compared with alloy cast steel and alloy forged steel, the alloy content is increased, especially the red hardness element content such as Mo, V and the like is greatly increased, the carbide type and content in the structure are increased, and the matrix strength is further enhanced by adding the microalloy element Nb. The strength and fatigue resistance of the roll neck are obviously improved.
The Nb element is used as a strengthening and toughening element, can refine the crystal grains of the steel, reduce the overheat sensitivity and tempering brittleness of the steel, and can improve the heat resistance of the steel at high temperature, thereby playing a role in strengthening and toughening. However, the addition of Nb as a "micro" alloying element should be controlled within a certain range, and too high or too low of Nb can reduce the performance of the steel. When the content is low, the strengthening and toughening effects are not obvious; when the content is too high, the strength is obviously improved, but the high-temperature fatigue resistance of the steel is reduced. Thus, the Nb element is generally controlled in the range of 0.001 to 0.2%.
The preparation heat treatment mode adopted by the invention is annealing and tempering. Compared with normalizing and tempering, the quenching and tempering process has higher cooling strength, more thorough tissue transformation and capability of effectively improving the core tissue, so that the strength of the roll neck after quenching and tempering is higher than that of the normalizing.
Claims (5)
1. A high alloy forged steel hot rolling R1 work roll which is characterized in that: the high alloy forged steel hot rolling R1 working roll comprises the following chemical components: c:0.3-0.7%, si:0.4-0.8%, mn:0.4-0.8%, cr:3.5-4.5%, ni:0.4-0.8%, mo:0.4-0.8%, V:0.05-0.25%, nb:0.001-0.2%, cu less than or equal to 0.3%, H less than or equal to 2ppm, O less than or equal to 15ppm, N less than or equal to 70ppm, P and S less than or equal to 0.025%, and Fe and unavoidable impurities as the rest.
2. The method for manufacturing the high alloy forged steel hot rolling R1 working roll according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
s1, selecting scrap steel, pig iron and alloy materials which meet the chemical composition requirements of a finished product as furnace charges;
s2, primary refining is carried out on the scrap steel and pig iron selected in the step S1 by adopting an electric arc furnace oxidation method;
s3, after primary refining of scrap steel and pig iron, transferring the primary refining of the scrap steel and the pig iron into an LF refining furnace, performing white slag operation in the whole LF refining process, adding alloy materials in batches, and adding micro-alloy element ferroniobium in different positions of molten steel in batches at the end of refining;
s4, after LF refining is completed, heating and then performing VD vacuum degassing operation in a VD vacuum degassing furnace;
s6, heating after vacuum degassing by VD, and then adopting a large taper ingot mould to carry out ladle hanging casting;
s7, after demolding, transferring the steel ingot to a forging factory, and forging a high alloy forged steel hot rolling R1 working roll blank by adopting a near-net forging process;
s8, performing preliminary heat treatment, namely annealing and tempering;
s9, performing performance heat treatment, namely performing industrial frequency integral quenching and tempering, wherein the quenching temperature is 900-950 ℃ and the tempering temperature is 400-500 ℃;
and step S10, performing performance detection on the forging after the twice heat treatment is completed.
3. The method for manufacturing the high alloy forged steel hot rolling R1 working roll according to claim 1, wherein the method comprises the following steps: and in the step S2, P is ensured to be less than or equal to 0.01 percent before tapping.
4. The method for manufacturing the high alloy forged steel hot rolling R1 working roll according to claim 1, wherein the method comprises the following steps: and in the step S3, the single adding amount of the micro-alloy element ferroniobium is not more than 0.10kg/t molten steel, and the adding positions of the micro-alloy element ferroniobium are uniformly distributed on the surface of the molten steel.
5. The method for manufacturing the high alloy forged steel hot rolling R1 working roll according to claim 1, wherein the method comprises the following steps: and in the step S7, the shape of the high alloy forged steel hot rolling R1 working roll blank is similar to that of a finished product, and the machining allowance of the unilateral roll blank is not more than 15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310878605.XA CN116987965A (en) | 2023-07-18 | 2023-07-18 | High-alloy forged steel hot-rolled R1 working roll and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310878605.XA CN116987965A (en) | 2023-07-18 | 2023-07-18 | High-alloy forged steel hot-rolled R1 working roll and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116987965A true CN116987965A (en) | 2023-11-03 |
Family
ID=88531310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310878605.XA Pending CN116987965A (en) | 2023-07-18 | 2023-07-18 | High-alloy forged steel hot-rolled R1 working roll and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116987965A (en) |
-
2023
- 2023-07-18 CN CN202310878605.XA patent/CN116987965A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109913768B (en) | Electroslag remelting hot work die steel and preparation method thereof | |
| CN103014534B (en) | Cast hot work die steel and processing method thereof | |
| CN110000362B (en) | High-tungsten-vanadium high-speed steel wear-resistant roller and manufacturing method thereof | |
| CN102703822B (en) | Preparation method of high-speed steel for composite roll collar | |
| CN111057934A (en) | High-performance hot-work die steel and production process thereof | |
| CN111876662B (en) | Hot-work die steel plate and manufacturing method thereof | |
| CN111945053B (en) | Method for preparing high-speed steel roller by composite modification treatment | |
| CN106086668A (en) | A kind of high-performance high speed stamping cold work die steel and preparation method thereof | |
| CN112322970A (en) | High-chromium steel composite roll collar and manufacturing method thereof | |
| CN109280743B (en) | High-strength wear-resistant steel for roller and production method thereof | |
| CN112831719B (en) | Durable high-speed steel roller and manufacturing method thereof | |
| WO2019080458A1 (en) | Micro-alloyed spring steel and preparation method thereof | |
| CN114351032A (en) | Preparation method of high-material vertical roll | |
| CN114346197B (en) | Preparation method of surface roughness-resistant roller for heavy and medium plate mill | |
| CN114934231A (en) | High-manganese low-magnetism high-strength austenitic steel and manufacturing method thereof | |
| CN108004458B (en) | Improved high-chromium iron roller for tungsten modification treatment | |
| CN108950134B (en) | Remelting method of electroslag ingot for cold roll | |
| CN111101062A (en) | high-Nb high-speed steel roll for centrifugal composite casting with improved hot rolling and preparation method thereof | |
| CN116334483A (en) | Reducing roller collar based on steel tube rolling mill and manufacturing method thereof | |
| CN114570903B (en) | Wear-resistant low-alloy high-speed steel composite roller and preparation method thereof | |
| CN102134683A (en) | Guide roller and preparation technique thereof | |
| CN107497859A (en) | A kind of abrasion-resistant roller | |
| CN116987965A (en) | High-alloy forged steel hot-rolled R1 working roll and preparation method thereof | |
| CN113604730A (en) | High-temperature-resistant and high-toughness hot-work die steel and production process thereof | |
| CN113943886A (en) | Hot-work die steel with high toughness and crack resistance and preparation 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 |