CN103741045A - Alloy steel material for composite roll surface layer and preparation method thereof - Google Patents
Alloy steel material for composite roll surface layer and preparation method thereof Download PDFInfo
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- CN103741045A CN103741045A CN201310701650.4A CN201310701650A CN103741045A CN 103741045 A CN103741045 A CN 103741045A CN 201310701650 A CN201310701650 A CN 201310701650A CN 103741045 A CN103741045 A CN 103741045A
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to an alloy steel material for a composite roll surface layer. The alloy steel material contains the following chemical elements in percentage by weight: 0.8-0.9% of carbon, 1.0-1.5% of tungsten, 1.5-2.5% of molybdenum, 1.0-1.2% of vanadium, 3.5-4.5% of chromium, 0.15-0.20% of niobium, 0.05-0.10% of neodymium, 0.3-0.5% of manganese, 0.06-0.08% of titanium, 0.003-0.005% of boron, less than or equal to 0.030% of phosphorus and less than or equal to 0.030% of sulfur, and the balance of iron. According to the alloy steel material, a plurality of alloying elements such as boron, neodymium, molybdenum, niobium and the like are added on the basis of high-carbon steel, secondary refining is carried out, heat treatment temperature after casting is reasonably controlled, and raw materials are put in batches, therefore, the alloy steel has the characteristics of high-speed steel, has high-temperature resistance, high red hard characteristic, good coordination of rigidity and toughness, good surface abrasive resistance, good anti-stripping performance, low cold brittleness and good processing property, is suitable for the surface layer of the composite roll, is wear-resistant and has strong binding force with a middle layer.
Description
Technical field
The present invention relates to roll technology field, relate in particular to alloy steel material and preparation method thereof for a kind of composite roll top layer.
Background technology
Roll is the central module of wire rod machine, and gadolinium part is carried out to gadolinium processing processed, makes metal produce the main tool of viscous deformation.Roll working load is large, bears very large gadolinium pressing pressure and torsional moment, and has very strong shock load and very large mass force; In addition, the Working environment of roll is harsh, bear very high temperature, has again water coolant, is in the cold and hot lower work that accompanies each other, serious wear.
High carbon and chromium cast steel, the several types such as ordinary steel and Wimet.High carbon and chromium cast steel is owing to there being certain wear resistance, and low price, is therefore widely used, and high carbon and chromium running roller has 13Cr13WMoV and 18Cr20WMoV with the conventional material of steel.Because these two kinds of steel hardness and wear resistance mainly rely on the carbide Cr of chromium
7c
3and Cr
23c
6, thermostability is poor, generally at 450 ℃, starts above agglomeration and softening gradually.In the time of 550 ℃, hardness will be down to below HRC50.And the temperature of wire rod running roller under operation can reach 550 ℃ of left and right, this just makes running roller obviously reduce work-ing life.The secondary hardening temperature of ordinary steel is 550 ℃ of left and right, and hardness maintains HRC62 ~ 64, can improve significantly the work-ing life of running roller; Wimet also has good hot hardness and wear resistance.But because the manufacturing cost of ordinary steel and Wimet is too high, in the use of high line running roller material, be restricted.Therefore study excellent performance, the roll material that cost is cheaper just seems particularly important.
Summary of the invention
The object of the present invention is to provide alloy steel material and preparation method thereof for a kind of composite roll top layer, this alloy material has good processability, wear-resisting, resistant to elevated temperatures advantage.
Technical scheme of the present invention is as follows:
A composite roll top layer alloy steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.8-0.9, tungsten 1.0-1.5, molybdenum 1.5-2.5, vanadium 1.0-1.2, chromium 3.5-4.5, niobium 0.15-0.20, neodymium 0.05-0.10, Mn0.3-0.5, Ti0.06-0.08, B0.003-0.005, P≤0.030, S≤0.030, surplus are iron.
The production method of alloy steel material for described composite roll top layer, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) vanadium, chromium, B; (2) tungsten, niobium, neodymium; (3) other remaining components; The timed interval that each batch drops into element is 22-25 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 200-210 ℃/h of speed, be warming up to 660-670 ℃, and insulation 40-50 minute, then with 220-230 ℃/h of speed, be warming up to 960-970 ℃, insulation 4-5 hour; With 180-190 ℃/h of speed, be cooled to 580-590 ℃ again, then be warming up to 720-730 ℃ with 220-230 ℃/h of speed, then be cooled to 220-230 ℃ with 180-190 ℃/h of speed, insulation 3-4 hour; With 100-110 ℃/h of speed, be warming up to 330-350 ℃ again, insulation 40-50 minute, then be warming up to 530-550 ℃ with 100-110 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
Described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 3-5, clay 10-12, Sodium Silicofluoride 3-4, sodium carbonate 2-3, sodium tetraborate 1-2, stalk ashes 4-5, potassium felspar sand 36-40, jade powder 3-4, carclazyte 6-8, ground dolomite 3-4; Preparation method mixes each raw material, is heated to 2600-2900 ℃ to molten state, stirs 10-15 minute, is poured into Quench in pure water, then is ground into 100-200 order powder, washes with water for several times, dries and get final product.
Beneficial effect of the present invention
The present invention is by add the multiple alloying elements such as B, neodymium, molybdenum, niobium on the basis of high carbon steel, and through secondary refining, postheat treatment temperature is cast in rationally control, throwing raw materials in batches, makes steel alloy have the characteristic of rapid steel, high temperature resistant, red hard height, rigidity and toughness are worked good, and it is good to have surface abrasion resistance, antistripping is good, cold shortness is low, good processability, be suitable for the upper layer of composite roll, wear-resisting, strong with middle layer bonding force, cost is lower.The present invention uses part scrap iron as raw material, makes more stable uniform of alloy quality, improves comprehensive mechanical property.Refining agent of the present invention is for Foundry Production, and the degree of porosity obviously improving in yield rate, particularly foundry goods reduces 1-2 degree, can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, and oxide inclusion is 2 grades of left and right.
Embodiment
A composite roll top layer alloy steel material, chemical element composition and mass percent thereof that it contains are: carbon 0.8-0.9, tungsten 1.0-1.5, molybdenum 1.5-2.5, vanadium 1.0-1.2, chromium 3.5-4.5, niobium 0.15-0.20, neodymium 0.05-0.10, Mn0.3-0.5, Ti0.06-0.08, B0.003-0.005, P≤0.030, S≤0.030, surplus are iron.
Described composite roll top layer by the production method of alloy steel material is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.7 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) vanadium, chromium, B; (2) tungsten, niobium, neodymium; (3) other remaining components; The timed interval that each batch drops into element is 23 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 205 ℃/h of speed, be warming up to 665 ℃, be incubated 45 minutes, then be warming up to 965 ℃ with 225 ℃/h of speed, be incubated 4.5 hours; With 185 ℃/h of speed, be cooled to 585 ℃ again, then be warming up to 725 ℃ with 225 ℃/h of speed, then be cooled to 225 ℃ with 185 ℃/h of speed, be incubated 3.5 hours; With 105 ℃/h of speed, be warming up to 340 ℃ again, be incubated 45 minutes, then be warming up to 540 ℃ with 105 ℃/h of speed, be incubated 2.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 3, clay 10, Sodium Silicofluoride 4, sodium carbonate 2, sodium tetraborate 1, stalk ashes 4, potassium felspar sand 36, jade powder 3, carclazyte 6, ground dolomite 3; Preparation method mixes each raw material, is heated to 2600-2900 ℃ to molten state, stirs 10-15 minute, is poured into Quench in pure water, then is ground into 100-200 order powder, washes with water for several times, dries and get final product.
Composite roll of the present invention top layer by the mechanical property of alloy steel material is: tensile strength 1011MPa, yield strength 863MPa, unit elongation 14.3%, relative reduction in area 31%, impact absorbing energy 54J, impelling strength 60J/cm2, hardness 293HB.
Claims (4)
1. a composite roll top layer alloy steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.8-0.9, tungsten 1.0-1.5, molybdenum 1.5-2.5, vanadium 1.0-1.2, chromium 3.5-4.5, niobium 0.15-0.20, neodymium 0.05-0.10, Mn0.3-0.5, Ti0.06-0.08, B0.003-0.005, P≤0.030, S≤0.030, surplus are iron.
2. the production method of alloy steel material for composite roll according to claim 1 top layer, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) vanadium, chromium, B; (2) tungsten, niobium, neodymium; (3) other remaining components; The timed interval that each batch drops into element is 22-25 minute, after feeding intake, stirs.
3. the production method of alloy steel material for composite roll according to claim 2 top layer, it is characterized in that: described casting postheat treatment is: first by room temperature, with 200-210 ℃/h of speed, be warming up to 660-670 ℃, insulation 40-50 minute, with 220-230 ℃/h of speed, be warming up to 960-970 ℃ again, insulation 4-5 hour; With 180-190 ℃/h of speed, be cooled to 580-590 ℃ again, then be warming up to 720-730 ℃ with 220-230 ℃/h of speed, then be cooled to 220-230 ℃ with 180-190 ℃/h of speed, insulation 3-4 hour; With 100-110 ℃/h of speed, be warming up to 330-350 ℃ again, insulation 40-50 minute, then be warming up to 530-550 ℃ with 100-110 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method of alloy steel material for composite roll according to claim 2 top layer, is characterized in that: described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 3-5, clay 10-12, Sodium Silicofluoride 3-4, sodium carbonate 2-3, sodium tetraborate 1-2, stalk ashes 4-5, potassium felspar sand 36-40, jade powder 3-4, carclazyte 6-8, ground dolomite 3-4; Preparation method mixes each raw material, is heated to 2600-2900 ℃ to molten state, stirs 10-15 minute, is poured into Quench in pure water, then is ground into 100-200 order powder, washes with water for several times, dries and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310701650.4A CN103741045B (en) | 2013-12-19 | 2013-12-19 | A kind of Alloy steel material for composite roll surface layer and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310701650.4A CN103741045B (en) | 2013-12-19 | 2013-12-19 | A kind of Alloy steel material for composite roll surface layer and preparation method thereof |
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| CN103741045A true CN103741045A (en) | 2014-04-23 |
| CN103741045B CN103741045B (en) | 2015-12-30 |
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| CN201310701650.4A Expired - Fee Related CN103741045B (en) | 2013-12-19 | 2013-12-19 | A kind of Alloy steel material for composite roll surface layer and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4966626A (en) * | 1988-06-28 | 1990-10-30 | Nissan Motor Company, Limited | Sintered ferro alloy having heat and wear resistance and process for making |
| JPH08100239A (en) * | 1995-09-08 | 1996-04-16 | Daido Steel Co Ltd | Alloy tool steel |
| CN1957101A (en) * | 2004-05-21 | 2007-05-02 | 工业钢克鲁梭公司 | Steel with high mechanical strength and wear resistance |
| CN103320720A (en) * | 2013-07-15 | 2013-09-25 | 四川大学 | Vanadium-containing high-boron high-chromium wear-resistant alloy and preparation method thereof |
-
2013
- 2013-12-19 CN CN201310701650.4A patent/CN103741045B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4966626A (en) * | 1988-06-28 | 1990-10-30 | Nissan Motor Company, Limited | Sintered ferro alloy having heat and wear resistance and process for making |
| JPH08100239A (en) * | 1995-09-08 | 1996-04-16 | Daido Steel Co Ltd | Alloy tool steel |
| CN1957101A (en) * | 2004-05-21 | 2007-05-02 | 工业钢克鲁梭公司 | Steel with high mechanical strength and wear resistance |
| CN103320720A (en) * | 2013-07-15 | 2013-09-25 | 四川大学 | Vanadium-containing high-boron high-chromium wear-resistant alloy and preparation method thereof |
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| CN103741045B (en) | 2015-12-30 |
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