CN103789635A - Preparation method of stainless steel used for digging buckets - Google Patents
Preparation method of stainless steel used for digging buckets Download PDFInfo
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- CN103789635A CN103789635A CN201210422665.2A CN201210422665A CN103789635A CN 103789635 A CN103789635 A CN 103789635A CN 201210422665 A CN201210422665 A CN 201210422665A CN 103789635 A CN103789635 A CN 103789635A
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Abstract
The invention discloses a preparation method of stainless steel used for digging buckets. The stainless steel comprises C, Si, Mn, P, S, Cr, Nb, Mo, W and Fe. According to the preparation method, the refining time in steelmaking in an induction furnace is controlled to be 15-30 min, the tapping temperature is controlled to be 1600-1620 DEG C, and titanium wires are added 5-7 min before tapping; a killing step is performed 3-8 min after the tapping step is finished and then a pouring step is started; the start rolling temperature during a rolling step is controlled to be 1200-1250 DEG C, the finish rolling temperature is controlled to be 900-920 DEG C, and a step of cooling in pile is performed after the rolling step is finished; the annealing pretreatment temperature is controlled to be 820-840 DEG C in a thermal treating step and the steel is cooled inside the furnace to room temperature; the quenching temperature is controlled to be 1120-1160 DEG C and the steel is then discharged from the furnace and cooled in the air; and the tempering temperature is controlled to be 150-250 DEG C and the steel is then discharged from the furnace and cooled in the air.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to the stainless preparation method of a kind of power shovel.
Background technology
The performance of power shovel is directly determining the work-ing life of scraper bowl, is one of most important steel grade of engineering machinery vehicle industry.The Working environment very severe of scraper bowl, the performance of scraper bowl is proposed to strict requirement: when cutting edge shovels into material as ore, sand, coal etc., directly and material generation strong friction and shock, except requiring scraper bowl to there is enough hardness and wear resistance, to keep out wearing and tearing, also need steel plate to there is higher toughness, to prevent steel plate deformed and fracture; Because cutting edge plate is to be generally welded on scraper bowl to use, cutting edge is had to strict requirement by the welding property of steel simultaneously.
The steel grade using on cutting edge is at present more, and except anti-wear steel NM360, NM400 series and 1E0921 series, the producer also having is directly used the ordinary steel such as Q345 or 16Mn.Because engineering machinery vehicle industry competition is day by day fierce, each producer has all proposed strict requirement to cutting edge by steel cost performance in recent years: both required cutting edge steel functional, to guarantee that scraper bowl has longer work-ing life; Require again the scraper bowl price can not be too high, to reduce the production cost of enterprise.In this case, the ordinary steels such as Q345 and 16Mn, because wear resisting property is too poor, are eliminated substantially.
In addition, because scraper bowl directly contacts with the material such as sandstone, and because making scraper bowl surface, larger frictional force heats up when contact, in the time containing certain moisture in sandstone, the surface of the scraper bowl that makes to adopt above-mentioned conventional material to be prepared is produced to corrosion and destruction, and corrosion layer also will be rubbed off in the time that used next time, thereby exposed new surface again, and then generation corrosion, circulation successively, the work-ing life of scraper bowl will be reduced greatly, therefore, need a kind of stainless material that meets scraper bowl service requirements of research badly, to substitute the material of existing scraper bowl, to improve its use properties, and significantly extend work-ing life of scraper bowl.
Summary of the invention
The object of the invention is to propose the stainless preparation method of a kind of power shovel, stainless material prepared by the method is except having the etch-proof feature of stainless steel, also to meet that scraper bowl is wear-resisting, surface hardness is high, there is certain toughness, and there is good welding property.
For reaching this object, the present invention by the following technical solutions:
The stainless preparation method of a kind of power shovel, this stainless steel is made up of following component by weight percentage: C:0.30～0.40%, Si:0.60～0.80%, Mn:0.70～0.90%, P :≤0.030%, S :≤0.010%, Cr:13.0～15.0%, Nb:0.10～0.30%, Mo:0.20～0.40%, W:0.50～1.50%, surplus is Fe and inevitable impurity; Described preparation method comprises induction furnace steel-smelting, cast, rolling, the thermal treatment of heap cold-peace, is specially: the refining time of described induction furnace steel-smelting is controlled at 15～30min, and tapping temperature is controlled at 1600～1620 ℃, and the front 5～7min that taps adds titanium wire; Go out calm 3～8min after steel, then starting cast; The start rolling temperature of rolling is controlled at 1200～1250 ℃, and finishing temperature is controlled at 900～920 ℃, rolls rear cooling in heap; In heat treatment process, the pretreated temperature of annealing is controlled at 820～840 ℃, cools to room temperature with the furnace; The temperature of quenching is controlled at 1120～1160 ℃, the air cooling of coming out of the stove; The temperature of tempering is controlled at 150～250 ℃, and the air cooling of coming out of the stove finally obtains finished product.
Reason and effect that in stainless steel of the present invention, each alloying constituent content limits are as follows:
Carbon (C) is the principal element that determines steel hardness and intensity, promotes the solid solution carbon amount that forms carbide and improve in quenched martensite to increase its degree of distortion, and along with the increase of C content, the intensity of steel, hardness increase, and the plasticity of steel and toughness decline.Owing to requiring material to there is good hardness, so C content should not be too low, if but C too high levels, by forming thick fragility eutectic carbides, makes steel add man-hour easy to crack, and very easily chipping while making scraper bowl.C content target value is controlled in 0.20～0.65% scope, had both ensured good plasticity and the toughness of steel, can guarantee not chipping of scraper bowl, kept again the wear resistance of scraper bowl.
Silicon (Si), mainly as the deoxidant element in when steel-making, also has certain strengthening effect simultaneously, but content Gao Shiyi promotes the carbon in steel to form graphite, thereby causes the soft spots in steel to exist.
Manganese (Mn) adds performance complex deoxidization effect together with above-mentioned Si, simultaneously also can the S in steel be combined and forms MnS, avoid Fe be combined with S formation low melting point eutectic FeS and produce red brittleness.But when content is high without significant beneficial effect.
Chromium (Cr) is stainless principal element, and its content need just have antirust ability completely higher than 13%, and Cr content is high, solidity to corrosion is high, but content Gao Shiyi forms the intermetallic compound of fragility Cr, and increases cost.
Tungsten (W), as carbide, is easily combined with C and is formed dystectic hard WC particle, strengthens the durability of scraper bowl, and improves the anti-temper softening ability of scraper bowl.
Niobium (Nb) is in order to form tiny NbC second phase particles, and grain growth while stoping steel heating guarantees structure refinement in steel, improves obdurability, suppresses Cr simultaneously
23c
6carbide is separating out on crystal boundary in steel, reduces stainless Susceptibility To Intergranular Corrosion.Add Nb simultaneously and also can improve steel welding property.
The pearlitic transformation of middle temperature transformation product when molybdenum (Mo) deferrable steel quench cooled, thereby the hardening capacity of raising product made from steel; In addition, appropriate Mo can effectively suppress the temper brittleness of steel.
The scraper bowl stainless steel being obtained by above-mentioned chemical constitution and manufacture method has " cryptocrystalline martensite+granular carbide+residual austenite " complex tissue, and cryptocrystalline martensite and granular carbide have very high hardness, can fully guarantee that wear resistance, residual austenite have very high toughness.Through evidence, steel of the present invention has high rigidity, high tenacity and good erosion resistance, is applicable to manufacture scraper bowl.Manufacturing approach craft excellent property of the present invention simultaneously, production operation is simple, and quality product is easy to control, and lumber recovery is high, and cost is low.
Embodiment
Embodiment mono-
The stainless preparation method of a kind of power shovel, this stainless steel is made up of following component by weight percentage: C:0.30%, Si:0.80%, Mn:0.70%, P :≤0.030%, S :≤0.010%, Cr:15.0%, Nb:0.10%, Mo:0.40%, W:0.50%, surplus is Fe and inevitable impurity; Described preparation method comprises induction furnace steel-smelting, cast, rolling, the thermal treatment of heap cold-peace, is specially: the refining time of described induction furnace steel-smelting is controlled at 15min, and tapping temperature is controlled at 1620 ℃, and before tapping, 5min adds titanium wire; Go out calm 8min after steel, then starting cast; The start rolling temperature of rolling is controlled at 1200 ℃, and finishing temperature is controlled at 920 ℃, rolls rear cooling in heap; In heat treatment process, the pretreated temperature of annealing is controlled at 820 ℃, cools to room temperature with the furnace; The temperature of quenching is controlled at 1160 ℃, the air cooling of coming out of the stove; The temperature of tempering is controlled at 150 ℃, and the air cooling of coming out of the stove finally obtains finished product.
Embodiment bis-
The stainless preparation method of a kind of power shovel, this stainless steel is made up of following component by weight percentage: C:0.40%, Si:0.60%, Mn:0.90%, P :≤0.030%, S :≤0.010%, Cr:13.0%, Nb:0.30%, Mo:0.20%, W:1.50%, surplus is Fe and inevitable impurity; Described preparation method comprises induction furnace steel-smelting, cast, rolling, the thermal treatment of heap cold-peace, is specially: the refining time of described induction furnace steel-smelting is controlled at 30min, and tapping temperature is controlled at 1600 ℃, and before tapping, 7min adds titanium wire; Go out calm 3min after steel, then starting cast; The start rolling temperature of rolling is controlled at 1250 ℃, and finishing temperature is controlled at 900 ℃, rolls rear cooling in heap; In heat treatment process, the pretreated temperature of annealing is controlled at 840 ℃, cools to room temperature with the furnace; The temperature of quenching is controlled at 1120 ℃, the air cooling of coming out of the stove; The temperature of tempering is controlled at 250 ℃, and the air cooling of coming out of the stove finally obtains finished product.
Embodiment tri-
The stainless preparation method of a kind of power shovel, this stainless steel is made up of following component by weight percentage: C:0.35%, Si:0.70%, Mn:0.80%, P :≤0.030%, S :≤0.010%, Cr:14.0%, Nb:0.20%, Mo:0.30%, W:1.0%, surplus is Fe and inevitable impurity; Described preparation method comprises induction furnace steel-smelting, cast, rolling, the thermal treatment of heap cold-peace, is specially: the refining time of described induction furnace steel-smelting is controlled at 25min, and tapping temperature is controlled at 1610 ℃, and before tapping, 6min adds titanium wire; Go out calm 5min after steel, then starting cast; The start rolling temperature of rolling is controlled at 1225 ℃, and finishing temperature is controlled at 910 ℃, rolls rear cooling in heap; In heat treatment process, the pretreated temperature of annealing is controlled at 830 ℃, cools to room temperature with the furnace; The temperature of quenching is controlled at 1140 ℃, the air cooling of coming out of the stove; The temperature of tempering is controlled at 200 ℃, and the air cooling of coming out of the stove finally obtains finished product.
Claims (1)
1. the stainless preparation method of power shovel, it is characterized in that, this stainless steel is made up of following component by weight percentage: C:0.30～0.40%, Si:0.60～0.80%, Mn:0.70～0.90%, P :≤0.030%, S :≤0.010%, Cr:13.0～15.0%, Nb:0.10～0.30%, Mo:0.20～0.40%, W:0.50～1.50%, surplus is Fe and inevitable impurity; Described preparation method comprises induction furnace steel-smelting, cast, rolling, the thermal treatment of heap cold-peace, is specially: the refining time of described induction furnace steel-smelting is controlled at 15～30min, and tapping temperature is controlled at 1600～1620 ℃, and the front 5～7min that taps adds titanium wire; Go out calm 3～8min after steel, then starting cast; The start rolling temperature of rolling is controlled at 1200～1250 ℃, and finishing temperature is controlled at 900～920 ℃, rolls rear cooling in heap; In heat treatment process, the pretreated temperature of annealing is controlled at 820～840 ℃, cools to room temperature with the furnace; The temperature of quenching is controlled at 1120～1160 ℃, the air cooling of coming out of the stove; The temperature of tempering is controlled at 150～250 ℃, and the air cooling of coming out of the stove finally obtains finished product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210422665.2A CN103789635A (en) | 2012-10-29 | 2012-10-29 | Preparation method of stainless steel used for digging buckets |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210422665.2A CN103789635A (en) | 2012-10-29 | 2012-10-29 | Preparation method of stainless steel used for digging buckets |
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| CN103789635A true CN103789635A (en) | 2014-05-14 |
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| CN201210422665.2A Pending CN103789635A (en) | 2012-10-29 | 2012-10-29 | Preparation method of stainless steel used for digging buckets |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372248A (en) * | 2014-10-24 | 2015-02-25 | 无锡兆一锻压数控装备有限公司 | Bucket lip material for electric shovel and preparation method thereof |
| CN105154739A (en) * | 2015-08-22 | 2015-12-16 | 永仁力鑫钒钛低铬合金球有限公司 | Wear-resisting and corrosion-resisting alloy for bucket teeth and preparing method of wear-resisting and corrosion-resisting alloy |
-
2012
- 2012-10-29 CN CN201210422665.2A patent/CN103789635A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372248A (en) * | 2014-10-24 | 2015-02-25 | 无锡兆一锻压数控装备有限公司 | Bucket lip material for electric shovel and preparation method thereof |
| CN105154739A (en) * | 2015-08-22 | 2015-12-16 | 永仁力鑫钒钛低铬合金球有限公司 | Wear-resisting and corrosion-resisting alloy for bucket teeth and preparing method of wear-resisting and corrosion-resisting alloy |
| CN105154739B (en) * | 2015-08-22 | 2017-05-24 | 永仁力鑫钒钛低铬合金球有限公司 | Wear-resisting and corrosion-resisting alloy for bucket teeth and preparing method of wear-resisting and corrosion-resisting alloy |
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Application publication date: 20140514 |