CN105937008A - Thin-specification wear resisting steel and manufacturing method thereof - Google Patents
Thin-specification wear resisting steel and manufacturing method thereof Download PDFInfo
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- CN105937008A CN105937008A CN201610476448.XA CN201610476448A CN105937008A CN 105937008 A CN105937008 A CN 105937008A CN 201610476448 A CN201610476448 A CN 201610476448A CN 105937008 A CN105937008 A CN 105937008A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to thin-specification wear resisting steel. A steel plate comprises the following chemical components in percentage by mass: 0.13-0.20% of C, 0.10-0.70% of Si, 1.00-2.00% of Mn, P not more than 0.015%, S not more than 0.005%, 0.0005-0.004% of B, 0.010-0.020% of Ti, 0.010-0.060% of Als, 0.0005-0.0020% of Ca, and the balance of Fe and inevitable impurities; the thickness specification is not more than 20 mm; the carbon equivalent CEV is 0.30-0.50; and the surface hardness is 360-460 HB. The wear resisting steel adds no alloy components with relatively expensive production cost; and the wear resisting steel plate reaches the thickness of not more than 20 mm, the carbon equivalent CEV of 0.30-0.50 and the surface hardness of 360-460 HB.
Description
Technical field
The invention belongs to low alloy wear resistance steel plate and manufacture field, be specifically related to a kind of Thin Specs abrasion-resistant stee and manufacturer thereof
Method, steel plate thickness≤20mm, Brinell hardness reaches more than 360HB.
Background technology
Abrasion-resistant stee is classified by metallographic structure, is broadly divided into Austenitic abrasion-resistant stee, martensite type abrasion-resistant stee and bainite type
Abrasion-resistant stee.Dilute-alloy martensite abrasion-resistant stee, in all types of abrasion-resistant stees, shows excellent comprehensive mechanical property and usability
Energy.
Dilute-alloy martensite abrasion-resistant stee uses manganese Mn, chromium Cr, nickel and molybdenum Mo etc. element alloyed, add simultaneously niobium Nb,
The microalloy elements such as vanadium V, titanium Ti, general alloying element total amount≤5%.Add tempering by Technology for Heating Processing quenching, obtain group
It is woven to hard high-strength and the martensitic structure of preferable toughness.Dilute-alloy martensite abrasion-resistant stee has the supercool of small percentage
Austenite, more stable.Tempering is to reduce or eliminate the residual stress that quenching causes, and improves the plasticity and toughness of material, fall
Low fragility, it is thus achieved that the suitable cooperation of hardness, plasticity and toughness.Dilute-alloy martensite steel has the lath martensite of high rigidity,
Matrix is contained within a large amount of dislocation, it is possible to the preferably extension of crackle during opposing abrasion.
The alloying element total amount of dilute-alloy martensite abrasion-resistant stee is typically≤5%.Domestic and international each wear-resisting steel plate manufacturer,
In Thin Specs wear-resisting steel plate, typically can add total amount and reach all types of alloying elements of 1.5～3%.Alloying element adds more,
Meeting raising carbon equivalent by a relatively large margin so that carbon equivalent ce V reaches 0.40～0.60, adds solder technology difficulty, also can carry
High cooling cracks the susceptible index number, increases the risk of steel plate cracking, and then increases what steel plate ftractureed in all types of hot and cold courses of processing
Risk.
According to the needs of use environment, wear-resisting steel plate needs certain uniformity of hardness.In order to reach the purpose of uniformity,
Need to add in a large number the precious alloys such as Cr, Mo.Additionally, for the impact characteristics improving product, it is also possible to suitable interpolation is expensive
Ni element.The interpolation of expensive alloying elements, improves the cost of alloy of wear-resistant steel products.
Patent CN104245989A discloses a kind of abrasion-resistant stee with excellent toughness and weldability, uses carbon C, silicon
Si, manganese Mn composition design, and have good low-temperature flexibility, welding performance, but its Fe content has reached 2.5～4.5%, in steel
It is easily generated banded structure and MnS.High Fe content improves carbon equivalent and cold crack sensitivity coefficient Pcm so that the welding of steel plate
Degradation, also exacerbates risk and tendency that steel plate cracks.
Patent CN102373384A discloses a kind of high-strength high-toughness wear-resistant steel plate and manufacture method thereof.This patent has
Following features: 1) steel plate thickness specification 6～25mm；2) design of chromium Cr, nickel, molybdenum Mo, micro-titanium Ti composite parts, carbon equivalent are used
Reaching 0.44～0.54, this is unfavorable to welding performance, the risk cracked after also increasing steel plate bending and thermal cutting；3) roll
Rear quickly water-cooled substitutes out-line quenching mode and produces, although this mode of production is with low cost, but the uniformity of steel plate hardness
Far away from out-line quenching steel plate, exchange relatively low cost for sacrificing the uniformity of plate property.
Summary of the invention
It is an object of the invention to provide a kind of Thin Specs abrasion-resistant stee.This kind of steel plate can design with rational composition, relatively low
Cost, reliable technological design, realize the coupling of high rigidity and low-temperature impact toughness, meanwhile, there is good cold/hot cutting
Cut performance, welding performance and cold-bending property.This Thin Specs wear-resisting steel plate with good combination property, is conducive to applying not
Same construction machinery industry.
The present invention solves the technical scheme that the problems referred to above are used: a kind of Thin Specs abrasion-resistant stee, the chemistry one-tenth of this steel plate
Dividing is C: 0.13～0.20% by mass percentage, Si: 0.10～0.70%, Mn: 1.00～2.00%, P≤0.015%,
S≤0.005%, B: 0.0005～0.004%, Ti:0.010～0.020%, Als: 0.010～0.060%, Ca:
0.0005～0.0020%, surplus is Fe and inevitable impurity；Thickness specification be not more than 20mm, carbon equivalent ce V 0.30～
0.50, case hardness 360～460HB.
The foundation of the active chemical design of the present invention and the reason of restriction content range are as follows:
C is maximally effective intensified element in steel, and the gap solution strengthening of carbon atom is that in hardened steel, quenched martensite is strengthened
Main mechanism.Fine carbide and cementite that during lonneal, precipitation obtains are tempered martensites in quenched and tempered steel
The main mechanism of strengthening.Either the carbon of gap solid solution or the carbon of emerging clear cementite, all will damage moulding of steel significantly
Property, toughness, welding performance and cold forming capability, therefore, C content controls 0.13～0.20%.
Si deoxidizing capacity is relatively strong, is the conventional deoxidizer of steel-making, therefore all containing Si in general steel, appropriate silicon can subtract significantly
The slow tempered martensite decomposition rate when low temperature (200 DEG C), increases temper resistance, and makes the carbide that separates out during tempering not
Easily assembling, antagonism crack performance is favourable.Silicone content increase can cause the Silicate inclusion thing of Fe, Mn to increase, and plasticity ratio vulcanizes
Thing is low, can reduce the various mechanical properties of steel, and low melting point silicate can increase slag and melt the mobility of metal, affects weld seam
Quality.Therefore Si content range is 0.1～0.7%.
Mn mainly exists with solid solution state in steel alloy.The manganese of solid solution will produce certain solution strengthening effect.Manganese is low
Ferrite grain size after can making γ → α phase transformation in carbon steel substantially refines than the steel without manganese.Manganese is high at common low-alloy
Strength steel is formed carbide hardly, but it can be with the sulfuration synthesis MnS of remaining in steel.Generally, MnS is one
Kind of the field trash harmful to steel performance, but through suitable control and modified, it can be made bright to the extent of injury of steel performance
Aobvious reduction.Mn content of the present invention is in the range of 1.0～2.0%.
Al and oxygen have the strongest chemical affinity, can use as deoxidizer.Dissolved aluminum can form AlN, Ke Yiqi simultaneously
The effect of nitrogen in certain fixing molten steel.Aluminum content of the present invention is between 0.010～0.060%.
Ti can unrestrictedly dissolve each other with carbon, nitrogen, but owing to TiC with TiN solubility product in austenite differs greatly, because of
And at high temperature primarily form TiN, the effect of fixing nitrogen in steel can well be played.
In steel, S, P are objectionable impurities elements, and in steel, P, S content is the lowest more good.When in steel, S content is more, during hot rolling
Easily produce the problems such as hot-short；And when in steel, P content is more, steel is susceptible to cold short, additionally, phosphorus is also easy to segregation.
B for improving the quenching degree of quenched and tempered steel, this effect along with in steel the minimizing of carbon content and increase.Boron is tied with nitrogen
To make above-mentioned event resolves after conjunction, therefore, the present invention adds certain Ti and carrys out effective fixed nitrogen.
It is a further object of the present invention to provide the method manufacturing above-mentioned Thin Specs abrasion-resistant stee, first by raw materials for metallurgy successively warp
KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce meet chemical composition require, thickness be
150mm and above continuous casting billet；Continuous casting billet is again heated to 1210～1240 DEG C, time inside furnace more than 2.5 hours；Come out of the stove laggard
Row rolling, rolling mode is that high temperature rolls not controlled rolling soon, finishing temperature control more than 890 DEG C, total percentage pass reduction ＞ 85%, roll
Rolling off the production line after having made, heap is cooled to room temperature；Finally steel plate being carried out quenching+tempering process, quenching temperature is AC3+40～80
DEG C, quenching time inside furnace is 30～50min, and tempering heating-up temperature is 200～240 DEG C, and tempering time inside furnace is 50～70min,
Steel plate finished product is i.e. obtained after coming out of the stove.
The invention provides a kind of low cost, processing wear-resistant, easy, the abrasion-resistant stee of easily welding.Without production cost phase
To expensive alloying component (such as nickel, molybdenum Mo, chromium Cr, niobium Nb and vanadium V).
The technical problem to be solved is to provide a kind of thickness to work as less than 20mm, carbon for above-mentioned prior art
Amount CEV reaches 0.30～0.50, case hardness reach 360～460HB wear-resisting steel plate and manufacture method thereof.
Compared with prior art, it is an advantage of the current invention that:
(1) composition is simple, easily smelts, lower cost；
(2) carbon equivalent is low, good welding performance；
(3) steel plate is applicable to various types of hot and cold cutting, will not produce cutting crackle；
(4) there is good cold-bending property；
(5) producing according to the heat treatment method of the present invention, product can obtain stable performance；
(6) excellent combination property, has a wide range of applications the suitability.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
The wear-resisting steel plate thickness of the present embodiment is 8mm, and its chemical composition is shown in Table 1 by mass percentage, and surplus is Fe and can not
The impurity element avoided.
The manufacturing process of the wear-resisting steel plate that this 8mm is thick is, configures raw materials for metallurgy also by the chemical constituent of above-mentioned steel plate finished product
Successively through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce and meet chemical composition requirement, thickness
Degree is the continuous casting billet of about 150mm.Continuous casting billet is again heated to 1210～1235 DEG C, time inside furnace 160min.Carry out after coming out of the stove
High temperature rolling, rolling mode is not controlled rolling, finishing temperature 890～920 DEG C, total percentage pass reduction 94.7%.Under after having rolled
Line, heap is cooled to room temperature.Finally steel plate being carried out quenching+tempering process, quenching temperature is 920 DEG C, and quenching time inside furnace is
30min, tempering heating-up temperature is 240 DEG C, and tempering time inside furnace is 60min, i.e. obtains steel plate finished product after coming out of the stove.
The 8mm wear-resisting steel plate prepared via above-mentioned manufacturing process, surface average hardness 377HB, excellent combination property, its machine
Tool performance refers to table 2.
Embodiment 2
The wear-resisting steel plate thickness of the present embodiment is 12mm, and its chemical composition is shown in Table 1 by mass percentage, and surplus is Fe and not
Evitable impurity element.
The manufacturing process of the wear-resisting steel plate that this 12mm is thick is, configures raw materials for metallurgy also by the chemical constituent of above-mentioned steel plate finished product
Successively through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce and meet chemical composition requirement, thickness
Degree is the continuous casting billet of about 150mm.Continuous casting billet is again heated to 1210～1235 DEG C, time inside furnace 166min.Carry out after coming out of the stove
High temperature rolling, rolling mode is not controlled rolling, finishing temperature 890～910 DEG C, total percentage pass reduction 92%.Roll off the production line after having rolled,
Heap is cooled to room temperature.Finally steel plate being carried out quenching+tempering process, quenching temperature is 920 DEG C, and quenching time inside furnace is
30min, tempering heating-up temperature is 220 DEG C, and tempering time inside furnace is 60min, i.e. obtains steel plate finished product after coming out of the stove.
The 12mm wear-resisting steel plate prepared via above-mentioned manufacturing process, surface average hardness 407HB, excellent combination property, its
Mechanical performance refers to table 2.
Embodiment 3
The wear-resisting steel plate thickness of the present embodiment is 20mm, and its chemical composition is shown in Table 1 by mass percentage, and surplus is Fe and can not
The impurity element avoided.
The manufacturing process of the wear-resisting steel plate that this 20mm is thick is, configures raw materials for metallurgy also by the chemical constituent of above-mentioned steel plate finished product
Successively through KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce and meet chemical composition requirement, thickness
Degree is the continuous casting billet of about 150mm.Continuous casting billet is again heated to 1210～1240 DEG C, time inside furnace 158min.Carry out after coming out of the stove
High temperature rolling, rolling mode is not controlled rolling, finishing temperature 950～980 DEG C, total percentage pass reduction 86.7%.Under after having rolled
Line, heap is cooled to room temperature.Finally steel plate being carried out quenching+tempering process, quenching temperature is 920 DEG C, and quenching time inside furnace is
35min, tempering heating-up temperature is 200 DEG C, and tempering time inside furnace is 60min, i.e. obtains steel plate finished product after coming out of the stove.
The 20mm wear-resisting steel plate prepared via above-mentioned manufacturing process, surface average hardness 445HB, excellent combination property, its
Mechanical performance refers to table 2.
Inspection
According to GB4675.1 oblique Y groove welding crack test method, the wear-resisting steel plate of the embodiment of the present invention 1～3 is respectively carried out
5 groups of oblique Y groove welding crack tests.Welding conditions are 180A*28V*150mm/min, gas flow 25L/min.
First weld seam is restrained in welding, uses gas shielded arc welding welding, uses CHW50C2 welding wire, strictly control in welding process
The angular deformation of sample processed, waits sample to carry out the welding of pilot seam after being cooled to room temperature again.Pilot seam enters in room temperature (25 DEG C)
Row welding.After pilot seam welds 48 hours, inspection face of weld crackle, section crack and root crack.Through Dissection test,
Utilize colouring that the above three position is checked.Weld cracking expreiment the results are shown in Table 3.
From table 3, under not preheating condition, (the ambient temperature 25 DEG C) embodiment of the present invention 1～3 postwelding does not finds to split
Stricture of vagina, illustrates that the room temperature welding performance of steel plate of the present invention is good.
The chemical composition of each embodiment of table 1, CEV (wt%)
| Embodiment | C | Si | Mn | P | S | Als | Ti | Ca | B | CEV |
| 1 | 0.13 | 0.25 | 1.1 | 0.011 | 0.001 | 0.035 | 0.012 | 0.0014 | 0.0018 | 0.31 |
| 2 | 0.14 | 0.5 | 1.55 | 0.01 | 0.0009 | 0.033 | 0.012 | 0.0011 | 0.0021 | 0.398 |
| 3 | 0.19 | 0.49 | 1.8 | 0.012 | 0.001 | 0.048 | 0.013 | 0.0013 | 0.0019 | 0.49 |
CEV computing formula: CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15
The mechanical performance of the produced steel plate of each embodiment of table 2
The oblique Y groove welding crack test result of each embodiment of table 3
In addition to the implementation, other embodiments, all employing equivalents or equivalence substitute mode have been present invention additionally comprises
The technical scheme formed, all should fall within the scope of the hereto appended claims.
Claims (2)
1. a Thin Specs abrasion-resistant stee, it is characterised in that: the chemical composition of this steel plate be by mass percentage C: 0.13～
0.20%, Si: 0.10～0.70%, Mn: 1.00～2.00%, P≤0.015%, S≤0.005%, B: 0.0005～
0.004%, Ti:0.010～0.020%, Als: 0.010～0.060%, Ca: 0.0005～0.0020%, surplus is Fe and not
Evitable impurity；Thickness specification is not more than 20mm, carbon equivalent ce V 0.30～0.50, case hardness 360～460HB.
2. the method for Thin Specs abrasion-resistant stee described in a manufacturing claims 1, it is characterised in that: first by raw materials for metallurgy successively warp
KR molten iron pretreatment, converter smelting, LF refine, RH vacuum refining and continuous casting, produce meet chemical composition require, thickness be
150mm and above continuous casting billet；Continuous casting billet is again heated to 1210～1240 DEG C, time inside furnace more than 2.5 hours；Come out of the stove laggard
Row rolling, rolling mode is that high temperature rolls not controlled rolling soon, finishing temperature control more than 890 DEG C, total percentage pass reduction ＞ 85%, roll
Rolling off the production line after having made, heap is cooled to room temperature；Finally steel plate being carried out quenching+tempering process, quenching temperature is AC3+40～80
DEG C, quenching time inside furnace is 30～50min, and tempering heating-up temperature is 200～240 DEG C, and tempering time inside furnace is 50～70min,
Steel plate finished product is i.e. obtained after coming out of the stove.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107109587A (en) * | 2017-03-31 | 2017-08-29 | 华南理工大学 | Thin Specs wear-resisting steel plate and its manufacture method |
| CN110343952A (en) * | 2019-07-02 | 2019-10-18 | 唐山中厚板材有限公司 | A kind of hardness is not less than the wear-resisting steel plate and its production method of 600HBW |
| CN110965464A (en) * | 2019-12-24 | 2020-04-07 | 中铁十八局集团第四工程有限公司 | Anti-poking sheet and use method thereof |
| WO2022001886A1 (en) * | 2020-06-28 | 2022-01-06 | 武汉钢铁有限公司 | Tempering-free wear-resistant hot-rolled strip steel and production method thereof |
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| CN102876969A (en) * | 2012-07-31 | 2013-01-16 | 宝山钢铁股份有限公司 | Super-strength high-toughness wear resistant steel plate and production method thereof |
| CN103205627A (en) * | 2013-03-28 | 2013-07-17 | 宝山钢铁股份有限公司 | Low-alloy high-performance wear-resistant steel plate and manufacturing method thereof |
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| CN102260829A (en) * | 2010-05-28 | 2011-11-30 | 宝山钢铁股份有限公司 | 500 HB wear resistant steel plate and its manufacturing method |
| CN102433506A (en) * | 2011-12-19 | 2012-05-02 | 张家港市鼎力铸钢有限公司 | High strength wear resistant cast steel free from molybdenum and nickel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107109587A (en) * | 2017-03-31 | 2017-08-29 | 华南理工大学 | Thin Specs wear-resisting steel plate and its manufacture method |
| CN107109587B (en) * | 2017-03-31 | 2019-03-01 | 华南理工大学 | Thin gauge wear-resisting steel plate and its manufacturing method |
| CN110343952A (en) * | 2019-07-02 | 2019-10-18 | 唐山中厚板材有限公司 | A kind of hardness is not less than the wear-resisting steel plate and its production method of 600HBW |
| CN110965464A (en) * | 2019-12-24 | 2020-04-07 | 中铁十八局集团第四工程有限公司 | Anti-poking sheet and use method thereof |
| CN110965464B (en) * | 2019-12-24 | 2021-06-25 | 中铁十八局集团第四工程有限公司 | Anti-poking sheet and use method thereof |
| WO2022001886A1 (en) * | 2020-06-28 | 2022-01-06 | 武汉钢铁有限公司 | Tempering-free wear-resistant hot-rolled strip steel and production method thereof |
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