CN105543706A - High-strength high-toughness abrasion-resistant cast steel material and preparation method thereof - Google Patents
High-strength high-toughness abrasion-resistant cast steel material and preparation method thereof Download PDFInfo
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
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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
- C22C38/002—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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention relates to a high-strength high-toughness abrasion-resistant cast steel material and a preparation method thereof. The novel high-strength high-toughness abrasion-resistant cast steel material is pertinently designed and developed for the severe working conditions that in the operation process, a trough side not only bears violent friction of coal, a scraper blade and a chain, but also bears operation load of a coal cutter, lateral force and longitudinal force used for pushing and pulling a hydraulic support, extrusion force and impact force generated when large sized coal and rock get stuck in a trough and the like. According to the mechanical performance indexes the cast steel material can reach, the tensile strength Rm>=900 MPa, the fracture elongation A>=16%, the impact absorbing energy Aku>=32J, and the Brinell hardness HB is 270-310. According to the abrasion resistance, weightlessness is 1.55+/-0.03 g, and the weight loss ratio is 15.5+/-0.3 mg/m. According to the preparation method, production is easy, the cost is low, and the performance is high. Quantity production and application can be achieved in the industries such as mines, energy, transportation, agricultural machinery and engineering machinery.
Description
Technical field
The present invention relates to a kind of high-strength and high-ductility abrasion-resistant cast steel material and preparation method thereof, belong to technical field prepared by the exploitation of high-performance novel material and technique.
Background technology
Scraper conveyor is the prevailing traffic equipment of fully mechanized coal mining face, is also the support equipment of coalcutter orbit and hydraulic support, and because of it, to have structural strength high, transportcapacity is large, can bend, be convenient to again the advantages such as passing, so be widely applied in coal production.Middle trough is the major parts of scraper conveyor, and quality accounts for more than 70% of scraper conveyor total mass.The inefficacy of scraper conveyor, mainly because the overwear vt. of middle trough or fracture cause, therefore its usage quantity and consumption larger.According to incompletely statistics, because middle trough design strength is inadequate or manufacturing defect causes the phenomenon of fracture to happen occasionally, the middle trough that therefore China lost efficacy every year reaches hundreds thousand of joint, causes the waste of resource, seriously constrains the production in colliery.
Middle trough consists of the mode of assembly welding two ledges, middle plate and base plate.It is in use the bearing part of material, the severe friction of coal, scraper plate and chain is not only born in operational process, but also bear the operating load of coalcutter, push away, draw side force and the longitudinal force of hydraulic support, large coal, rock stuck in groove time extruding, surging force etc.Above bad working environments, causes the damage type of middle trough except shovel surface wear, and also have the damage etc. of the distortion of cell body, fracture and convex-concave end connection, account for 40% of complete machine failure rate, its work-ing life is the important indicator weighing complete machine work-ing life.
The ledge material used at present is ZG20CrSiMoMn, along with domestic and international scraper conveyor is constantly to large conveying quantity, long haul distance, high-power, long lifetime and high reliability future development, has higher requirement to the research and development of high-performance channel for scraper transporter.Therefore, the working condition severe for it is analyzed, develop that wear resisting property is superior, counter-bending, tensile property is good as early as possible, anti tear, shock-resistant, easy construction, high-abrasive material that friction resistance is little, to the work-ing life and the reliability that improve middle trough, significant.
Summary of the invention
The present invention is higher for solving current ledge material cost, and the technical problems such as wearability and obdurability performance deficiency, provide
oneplant high-strength and high-ductility abrasion-resistant cast steel material and preparation method.
Of the present invention
oneplant high-strength and high-ductility abrasion-resistant cast steel material to realize by the following technical solutions:
oneplant high-strength and high-ductility abrasion-resistant cast steel material, its chemical composition is: C:0.17-0.22wt%, Si :≤0.35wt%, Mn:1.0-1.2wt%, P≤0.025wt%, S≤0.025wt%, Cr:0.9-1.1wt%, Mo:0.2-0.3wt%, Nb:0.02-0.035wt%, B:0.003-0.004wt%; Surplus is Fe and inevitable impurity; The basis of above-mentioned chemical feedstocks adds RE again, and wherein the add-on of RE accounts for the 0.02-0.05wt% of above-mentioned chemical feedstocks quality.
Of the present invention
onethe preparation method planting high-strength and high-ductility abrasion-resistant cast steel material realizes by the following technical solutions: prepare chemical substance material according to the chemical composition of high-strength and high-ductility abrasion-resistant cast steel material, the chemical substance material of use comprises: steel scrap, the pig iron, ferrochrome, manganeseirom, ferro-silicon, ferro-molybdenum, ferrocolumbium, ferro-boron and mishmetal;
Comprise the following steps:
(1) selected chemical substance material
To use chemical substance quality of materials control of purity as follows, foreign matter content wherein all will lower than specify mass percent:
Ferrochrome: solid state 0.2%
Manganeseirom: solid state 0.2%
Ferro-silicon: solid state 0.2%
Ferro-molybdenum: solid state 0.2%
Ferrocolumbium: solid state 0.2%
Ferro-boron: solid state 0.2%
Mishmetal: solid state 0.2%
(2) smelt
Steel scrap, the pig iron, ferrochrome and ferro-molybdenum Hybrid Heating are melted, after melting down, adds ferro-silicon and manganeseirom pre-deoxidation and alloying; After stokehold adjusting component is qualified, temperature is risen to more than 1650 DEG C, add ferrocolumbium and ferro-boron final deoxygenation and alloying, then come out of the stove; Mishmetal being crushed to the fritter that granularity is less than 25mm, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold;
(3) cast
Casting mainly comprises the following steps: pour into foundry goods, rising head spreads a little anti-piping compound, cools in type, unpacks, shakeout, and foundry goods cools, excision rising head;
(4) thermal treatment
Foundry goods normalizing: 920 ± 3 DEG C,
Foundry goods quenches: 820 ± 3 DEG C,
Foundry goods tempering: 550 ± 3 DEG C;
Obtain high-strength and high-ductility abrasion-resistant cast steel material.
The present invention has obvious advance compared with background technology, it is the severe friction not only bearing coal, scraper plate and chain for ledge in operational process, but also bear the operating load of coalcutter, push away, draw side force and the longitudinal force of hydraulic support, large coal, rock stuck in groove time the bad working environments such as extruding, surging force, the economical high-strength and high-ductility abrasion-resistant cast steel material of the one designed and developed.Its composition characteristic take soft steel as matrix, add microalloy element Nb, B etc. and make its microalloying, chemical composition is: C:0.17-0.22wt%, Si :≤0.35wt%, Mn:1.0-1.2wt%, P≤0.025wt%, S≤0.025wt%, Cr:0.9-1.1wt%, Mo:0.2-0.3wt%, Nb:0.02-0.035wt%, B:0.003-0.004wt%; Surplus is Fe and inevitable impurity; The basis of above-mentioned chemical feedstocks adds RE again, and wherein the add-on of RE accounts for the 0.02-0.05wt% of above-mentioned chemical feedstocks quality.Wherein RE is not the content of the reservation in final sample, but with aforementioned number of chemical composition for benchmark adds.Smelt upper by the fusing of steel scrap, the pig iron, ferrochrome and ferro-molybdenum Hybrid Heating, after melting down, add ferro-silicon and manganeseirom pre-deoxidation and alloying; After stokehold adjusting component is qualified, temperature is risen to more than 1650 DEG C, add ferrocolumbium and ferro-boron final deoxygenation and alloying, then come out of the stove; Mishmetal being crushed to the fritter that granularity is less than 25mm, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold; By homogenizing normalizing treatment, intercritical hardening and high tempering heat treating method in thermal treatment process, to increase substantially comprehensive mechanical property and the abrasion resistance properties of novel material.
Further, smelting adopts electric arc furnace smelting, LF refinement outside-furnace and argon gas stirring technique, by homogenizing normalizing, critical hardening and high tempering heat treating method in thermal treatment process.Aforesaid method effectively can improve yield of alloy, the purity of molten steel, uniformity coefficient and degree of grain refinement.
The object of the invention is the deficiency for background technology, invented the new cast steel material of a kind of high-performance, its performance index can reach: tensile strength Rm >=900MPa; Tension set A >=16%; Impact absorbing energy Aku >=32J; Brinell hardness HB300-320.Abrasion resistance properties: weightless 1.55 ± 0.03g; Rate of weight loss 15.5 ± 0.3mg/m.This preparation method easily produces, low cost, high-performance.Mass production applications can be realized in the industries such as mine, the energy, traffic, agricultural machinery, engineering machinery.
Accompanying drawing explanation
Fig. 1 thermal treatment process figure.
Fig. 2 is sample metallurgical structure figure.
Embodiment
A kind of high-strength and high-ductility abrasion-resistant cast steel material, the chemical composition of described high-strength and high-ductility abrasion-resistant cast steel material is: C:0.17-0.22wt%(can select 0.17wt%, 0.19wt%, 0.21wt%, 0.22wt%), Si :≤0.35wt%, Mn:1.0-1.2wt%(can select 1.0wt%, 1.1wt%, 1.2wt%), P≤0.025wt%, S≤0.025wt%, Cr:0.9-1.1wt%(can select 0.9wt%, 1.0wt%, 1.1wt%), Mo:0.2-0.3wt%, Nb:0.02-0.035wt%(can select 0.02wt%, 0.025wt%, 0.030wt%, 0.035wt%), B:0.003-0.004wt%(can select 0.003wt%, 0.0035wt%, 0.004wt%), surplus is Fe and inevitable impurity, the basis of above-mentioned chemical feedstocks adds rare earth RE again, and the add-on of its middle-weight rare earths RE accounts for 0.02-0.05wt%(0.02wt%, 0.03wt%, 0.04wt%, 0.05wt% of above-mentioned chemical feedstocks quality).
Embodiment 1
oneplant high-strength and high-ductility abrasion-resistant cast steel material and preparation method, adopt following raw material: steel scrap, the pig iron, ferrochrome, manganeseirom, ferro-silicon, ferro-molybdenum, ferrocolumbium, ferro-boron and mishmetal etc.;
Comprise the following steps:
(1) selected chemical substance material
To the chemical substance quality of materials control of purity used following (foreign matter content lower than):
Ferrochrome: solid state 0.2%
Manganeseirom: solid state 0.2%
Ferro-silicon: solid state 0.2%
Ferro-molybdenum: solid state 0.2%
Ferrocolumbium: solid state 0.2%
Ferro-boron: solid state 0.2%
Mishmetal: solid state 0.2%
(2) smelt
Steel scrap, the pig iron, ferrochrome and ferro-molybdenum Hybrid Heating are melted, after melting down, adds ferro-silicon and manganeseirom pre-deoxidation and alloying; After stokehold adjusting component is qualified, temperature is risen to more than 1650 DEG C, add ferrocolumbium and ferro-boron final deoxygenation and alloying, then come out of the stove; Mishmetal being crushed to the fritter that granularity is less than 25mm, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold;
(3) cast
Casting mainly comprises the following steps: pour into Y type sample, rising head spreads a little heat preserving agent, cools in type, unpacks, shakeout, and foundry goods cools, excision rising head;
(4) thermal treatment
Foundry goods normalizing: 920 ± 3 DEG C, 1.5h
Foundry goods quenches: 820 ± 3 DEG C, 1.5h
Foundry goods tempering: 550 ± 3 DEG C; 1.5h.
Embodiment 2
oneplant high-strength and high-ductility abrasion-resistant cast steel material and preparation method, adopt following raw material: steel scrap, the pig iron, ferrochrome, manganeseirom, ferro-silicon, ferro-molybdenum, ferrocolumbium, ferro-boron and mishmetal etc.;
Comprise the following steps:
(1) selected chemical substance material
To the chemical substance quality of materials control of purity used following (foreign matter content lower than):
Ferrochrome: solid state 0.2%
Manganeseirom: solid state 0.2%
Ferro-silicon: solid state 0.2%
Ferro-molybdenum: solid state 0.2%
Ferrocolumbium: solid state 0.2%
Ferro-boron: solid state 0.2%
Mishmetal: solid state 0.2%
(2) smelt
Steel scrap, the pig iron, ferrochrome and ferro-molybdenum Hybrid Heating are melted, after melting down, adds ferro-silicon and manganeseirom pre-deoxidation and alloying; After stokehold adjusting component is qualified, temperature is risen to more than 1650 DEG C, add ferrocolumbium and ferro-boron final deoxygenation and alloying, then come out of the stove; Mishmetal being crushed to the fritter that granularity is less than 25mm, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold;
(3) cast
Casting mainly comprises the following steps: pour into ledge foundry goods, rising head spreads a little heat preserving agent, cools in type, unpacks, shakeout, and foundry goods cools, excision rising head;
(4) thermal treatment
Foundry goods normalizing: 920 ± 3 DEG C, 5h
Foundry goods quenches: 820 ± 3 DEG C, 5h
Foundry goods tempering: 550 ± 3 DEG C; 5h.
Embodiment 3
oneplant high-strength and high-ductility abrasion-resistant cast steel material and preparation method, adopt following raw material: steel scrap, the pig iron, ferrochrome, manganeseirom, ferro-silicon, ferro-molybdenum, ferrocolumbium, ferro-boron and mishmetal etc.;
Comprise the following steps:
(1) selected chemical substance material
To the chemical substance quality of materials control of purity used following (foreign matter content lower than):
Ferrochrome: solid state 0.2%
Manganeseirom: solid state 0.2%
Ferro-silicon: solid state 0.2%
Ferro-molybdenum: solid state 0.2%
Ferrocolumbium: solid state 0.2%
Ferro-boron: solid state 0.2%
Mishmetal: solid state 0.2%
(2) smelt
Steel scrap, the pig iron, ferrochrome and ferro-molybdenum Hybrid Heating are melted, after melting down, adds ferro-silicon and manganeseirom pre-deoxidation and alloying; After stokehold adjusting component is qualified, temperature is risen to more than 1650 DEG C, add ferrocolumbium and ferro-boron final deoxygenation and alloying, then come out of the stove; Mishmetal being crushed to the fritter that granularity is less than 25mm, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold;
(3) cast
Casting mainly comprises the following steps: pour into the cast panel part that 3cm is thick, rising head spreads a little heat preserving agent, cools in type, unpacks, shakeout, and foundry goods cools, excision rising head;
(4) thermal treatment
Foundry goods normalizing: 920 ± 3 DEG C, 1h
Foundry goods quenches: 820 ± 3 DEG C, 1h
Foundry goods tempering: 550 ± 3 DEG C; 1h.
Below in conjunction with accompanying drawing, the present invention will be further described:
Shown in Fig. 1, it is sample process of thermal treatment route map.First carry out normalizing treatment, temperature is 920 DEG C, and object is crystal grain thinning, obtains and organizes more uniformly, for further structural preparation is done in process.Then quench, in order to improve comprehensive mechanical property and the wear resisting property of the material of material, adopt sub-temperature quenching process (820 DEG C), obtain the two-phase structure of F+M, F can ensure plasticity, and M can ensure the intensity of material.Last tempering at 550 DEG C.
Shown in Fig. 2, it is the organization chart that Y type sample is final.The final ferrite that is organized as adds tempered sorbite.
Claims (3)
1. a high-strength and high-ductility abrasion-resistant cast steel material, it is characterized in that: the chemical composition of described high-strength and high-ductility abrasion-resistant cast steel material is: C:0.17-0.22wt%, Si :≤0.35wt%, Mn:1.0-1.2wt%, P≤0.025wt%, S≤0.025wt%, Cr:0.9-1.1wt%, Mo:0.2-0.3wt%, Nb:0.02-0.035wt%, B:0.003-0.004wt%; Surplus is Fe and inevitable impurity; The basis of above-mentioned chemical feedstocks adds RE again, and wherein the add-on of RE accounts for the 0.02-0.05wt% of above-mentioned chemical feedstocks quality.
2. prepare the method for high-strength and high-ductility abrasion-resistant cast steel material as claimed in claim 1 for one kind, it is characterized in that: prepare chemical substance material according to the chemical composition of high-strength and high-ductility abrasion-resistant cast steel material, the chemical substance material of use comprises: steel scrap, the pig iron, ferrochrome, manganeseirom, ferro-silicon, ferro-molybdenum, ferrocolumbium, ferro-boron and mishmetal;
Comprise the following steps:
(1) selected chemical substance material
To use chemical substance quality of materials control of purity as follows, foreign matter content wherein all will lower than specify mass percent:
Ferrochrome: solid state 0.2%
Manganeseirom: solid state 0.2%
Ferro-silicon: solid state 0.2%
Ferro-molybdenum: solid state 0.2%
Ferrocolumbium: solid state 0.2%
Ferro-boron: solid state 0.2%
Mishmetal: solid state 0.2%
(2) smelt
Steel scrap, the pig iron, ferrochrome and ferro-molybdenum Hybrid Heating are melted, after melting down, adds ferro-silicon and manganeseirom pre-deoxidation and alloying; After stokehold adjusting component is qualified, temperature is risen to more than 1650 DEG C, add ferrocolumbium and ferro-boron final deoxygenation and alloying, then come out of the stove; Mishmetal being crushed to the fritter that granularity is less than 25mm, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold;
(3) cast
Casting mainly comprises the following steps: pour into foundry goods, rising head spreads a little anti-piping compound, cools in type, unpacks, shakeout, and foundry goods cools, excision rising head;
(4) thermal treatment
Foundry goods normalizing: 920 ± 3 DEG C,
Foundry goods quenches: 820 ± 3 DEG C,
Foundry goods tempering: 550 ± 3 DEG C;
Obtain high-strength and high-ductility abrasion-resistant cast steel material.
3. the method for a kind of high-strength and high-ductility abrasion-resistant cast steel material according to claim 2, is characterized in that: smelting adopts electric arc furnace smelting, LF refinement outside-furnace and argon gas stirring technique; By homogenizing normalizing, critical hardening and high tempering heat treating method in thermal treatment process.
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Cited By (7)
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| CN107419205A (en) * | 2017-07-26 | 2017-12-01 | 柳州金特新型耐磨材料股份有限公司 | High-toughness wear-resistant steel and preparation method thereof |
| CN107675091A (en) * | 2017-09-18 | 2018-02-09 | 中国科学院金属研究所 | A kind of high-strength high-toughness and low-temperature military service cast steel material and heat treatment method |
| CN108486337A (en) * | 2018-03-01 | 2018-09-04 | 太原科技大学 | A kind of G18CrMo2-6 Heat-Treatments of Steel technique |
| CN110629122A (en) * | 2019-11-06 | 2019-12-31 | 西安煤矿机械有限公司 | High-strength cast steel material for rocker arm shell of coal mining machine and preparation process of high-strength cast steel material |
| CN111663017A (en) * | 2020-08-04 | 2020-09-15 | 南通新兴机械制造有限公司 | Manufacturing method of high-strength low-alloy cast steel for traction seat |
| CN113462856A (en) * | 2021-07-02 | 2021-10-01 | 太原理工大学 | Heat treatment method for improving toughness of steel casting of middle trough ledge of scraper conveyor |
| CN116377351A (en) * | 2023-04-19 | 2023-07-04 | 宁波市鄞州富春精密铸造有限公司 | High-strength wear-resistant steel casting and preparation method thereof |
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