CN106399808A - Smelting method of novel high-hardness spring steel - Google Patents
Smelting method of novel high-hardness spring steel Download PDFInfo
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- CN106399808A CN106399808A CN201610380620.1A CN201610380620A CN106399808A CN 106399808 A CN106399808 A CN 106399808A CN 201610380620 A CN201610380620 A CN 201610380620A CN 106399808 A CN106399808 A CN 106399808A
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- spring steel
- steel
- molten steel
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- slag
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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
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
Abstract
The invention discloses a smelting method of novel high-hardness spring steel. The smelting method of the novel high-hardness spring steel comprises the following specific steps: preparing the raw material; firstly adding Fe-Mn into the raw material prepared by the step A, then adding Fe-Si with 1.5-2.0% of Si, and finally adding Al; pouring a prepared alloy steel solution into a shaping mold filled with a heating agent of a gate riser; and blanking the poured steel, quenching, tempering at medium temperature and carrying out shot blasting treatment. The smelting method of the novel high-hardness spring steel has the beneficial effects that the spring steel produced by the method is wide in application, high in strength, elasticity and hardenability, and is suitable for producing high-load flat springs or spiral springs with line diameter being lower than 30mm in the industry of railway vehicles and automobile tractors and is also suitable for producing automobile damping systems with operating temperature being lower than 250 DEG C, the requirement on good mechanical property can be met, the mechanical property of the spring steel is effectively improved, the service life of the spring steel is effectively prolonged, and the hardness of the spring steel is higher.
Description
Technical field
The present invention relates to a kind of smelting process of spring steel, the smelting process of specially a kind of new high rigidity spring steel, belong to steel smelting process applied technical field.
Background technology
With the development of modern spring material kind, the raising of the particularly new emergence of high-strength metallic alloy and physical characteristic, spring product is made to have higher wider array of efficiency；The continuous renewal of spring product manufacturing processing technic and optimization simultaneously, as structure formation, heat treatment and external coating etc., make the application of spring and development more can meet its functional requirement, improve security, economy and the environmental protection characteristic of spring product use further, current spring steel uses martensitic stain less steel and is made up of raw material, need to be heat-treated again after making spring, manufacturing process is complicated, and yield rate is low, high cost, poor toughness, hardness is low.
Content of the invention
The purpose of the present invention is that the smelting process providing a kind of new high rigidity spring steel in order to solve the above problems.
The present invention is achieved through the following technical solutions above-mentioned purpose, a kind of smelting process of new high rigidity spring steel, comprises the following steps that：
Step A, the producing of raw material；
Step B, the alloying of molten steel；First in the raw material that step A is produced first plus Fe-Mn, afterwards plus si content 1.5-2.0% Fe-Si, finally plus Al；
Step C, the pouring of molten steel, the alloy produced molten steel are cast in the stock mould adding exothermic mixture at rising head in step B；
Step D, the process of spring steel, the steel pouring in step C is carried out blanking → quenching → average tempering → bead.
Preferably, in described step A, the producing process of raw material is as follows：
1), the drying of ore, puts into ore in oven first and is toasted；
2), the fusing of ore, by step 1) in ore after oxidation be placed in melting furnace and melted, add the CaO of 0.5%-1% weight ratio in fusion process；
3), the oxidation of ore, by step 2) in fusing ore be placed on temperature>In 1550 DEG C of stove, when seething with excitement in molten bath, stir molten steel, so that metal level and slag blanket is floated, remove pernicious gas and field trash in molten steel, the molten steel standing 5-10min of boiling；
4), the reduction of molten steel, by step 3) molten steel that stands carries out deoxidation treatment.
Preferably, described step 3) ore oxidizing process in decarbonization rate>0.6%C/h, decarburized amount>0.3～0.4%, basicity of slag R=2～3, FeO：12～13%, the quantity of slag controls 3～4%.
Preferably, described step 4) in deoxidation process as follows：Standing molten steel in add 0.6-0.9 weight % Mn, 1.5-2 weight % Si, 0.56-0.64 weight %C pre-deoxidation, after the thin slag in molten steel surface is formed, add powdered carbon, silica flour, aluminium block, Ca-Si alloy final deoxidizing.
Preferably, in deoxidation process, basicity of slag controls FeO content in R=2.5-3.5, slag<O.5%.
Preferably, in described step D, the processing procedure of spring steel is as follows：First, the spring steel pouring is carried out blanking, after blanking, carry out Quenching Treatment, temperature during quenching is 840-870 DEG C, carries out oil cooling 1-2h after quenching, the good spring steel of oil cooling is put and is incubated 0.5-1h in 450 DEG C -500 DEG C again, water drenching cooling 2-3h after coming out of the stove.
The invention has the beneficial effects as follows：The spring steel of this kind of method making is widely used, intensity, elasticity and quenching degree are higher, spring steel is suitable to rail truck, the flat spring of the larger load or line footpath helical spring in below 30mm is born in the industrial making of automobile and tractor, it is also suitably for making operating temperature below 250 DEG C and car shock mitigation system etc., this kind of spring steel meets the needs of good mechanical property, effectively improve mechanical property and the service life of spring steel using the spring steel that the method makes, make its hardness higher, improve silicon on the basis of carbon steel, the content of manganese makes, improve the hardness of steel, intensity, yield tensile ratio and fatigue strength, silicon has the effect improving steel belt roof bolt stability simultaneously, improve quenching degree and the wearability of steel, there are good economic benefit and social benefit, it is suitable for promoting the use of.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, broadly fall into the scope of protection of the invention.
Embodiment one：
A kind of smelting process of new high rigidity spring steel, comprises the following steps that：
Step A, the producing of raw material；
Step B, the alloying of molten steel；First in the raw material that step A is produced first plus Fe-Mn, afterwards plus si content 1.5-2.0% Fe-Si, finally plus Al；
Step C, the pouring of molten steel, the alloy produced molten steel are cast in the stock mould adding exothermic mixture at rising head in step B；
Step D, the process of spring steel, the steel pouring in step C is carried out blanking → quenching → average tempering → bead.
In described step A, the producing process of raw material is as follows：
1), the drying of ore, puts into ore in oven first and is toasted；
2), the fusing of ore, by step 1) in ore after oxidation be placed in melting furnace and melted, add the CaO of 1% weight ratio in fusion process；
3), the oxidation of ore, by step 2) in fusing ore be placed on temperature>In 1550 DEG C of stove, when seething with excitement in molten bath, stir molten steel, so that metal level and slag blanket is floated, remove pernicious gas and field trash in molten steel, the molten steel standing 10min of boiling；
4), the reduction of molten steel, by step 3) molten steel that stands carries out deoxidation treatment.
Described step 3) ore oxidizing process in decarbonization rate>O.6%C/h, decarburized amount>0.3～0.4%, basicity of slag R=2～3, FeO：12～13%, the quantity of slag controls 3～4%.
Described step 4) in deoxidation process as follows：Add the Si of Mn, 1.5-2 weight % of 0.9 weight %, the %C pre-deoxidation of 0.64 weight in the molten steel of standing, after the thin slag in molten steel surface is formed, add powdered carbon, silica flour, aluminium block, Ca-Si alloy final deoxidizing.
In deoxidation process, basicity of slag controls FeO content in R=2.5-3.5, slag<O.5%.
In described step D, the processing procedure of spring steel is as follows：First, the spring steel pouring is carried out blanking, after blanking, carry out Quenching Treatment, temperature during quenching is 870 DEG C, carries out oil cooling 2h after quenching, the good spring steel of oil cooling is put and is incubated 1h in 450 DEG C -500 DEG C again, water drenching cooling 3h after coming out of the stove.
Embodiment two：
A kind of smelting process of new high rigidity spring steel, comprises the following steps that：
Step A, the producing of raw material；
Step B, the alloying of molten steel；First in the raw material that step A is produced first plus Fe-Mn, afterwards plus si content 1.5-2.0% Fe-Si, finally plus Al；
Step C, the pouring of molten steel, the alloy produced molten steel are cast in the stock mould adding exothermic mixture at rising head in step B；
Step D, the process of spring steel, the steel pouring in step C is carried out blanking → quenching → average tempering → bead.
In described step A, the producing process of raw material is as follows：
1), the drying of ore, puts into ore in oven first and is toasted；
2), the fusing of ore, by step 1) in ore after oxidation be placed in melting furnace and melted, add the CaO of 1% weight ratio in fusion process；
3), the oxidation of ore, by step 2) in fusing ore be placed on temperature>In 1550 DEG C of stove, when seething with excitement in molten bath, stir molten steel, so that metal level and slag blanket is floated, remove pernicious gas and field trash in molten steel, the molten steel standing 5min of boiling；
4), the reduction of molten steel, by step 3) molten steel that stands carries out deoxidation treatment.
Described step 3) ore oxidizing process in decarbonization rate>O.6%C/h, decarburized amount>0.3～0.4%, basicity of slag R=2～3, FeO：12～13%, the quantity of slag controls 3～4%.
Described step 4) in deoxidation process as follows：Add the %C pre-deoxidation of the Mn of 0.6 weight %, Si, 0.56-0.64 weight of 1.5 weight % in the molten steel of standing, after the thin slag in molten steel surface is formed, add powdered carbon, silica flour, aluminium block, Ca-Si alloy final deoxidizing.
In deoxidation process, basicity of slag controls FeO content in R=2.5-3.5, slag<O.5%.
In described step D, the processing procedure of spring steel is as follows：First, the spring steel pouring is carried out blanking, after blanking, carry out Quenching Treatment, temperature during quenching is 840-870 DEG C, carries out oil cooling 1h after quenching, the good spring steel of oil cooling is put and is incubated 0.5h in 450 DEG C -500 DEG C again, water drenching cooling 2h after coming out of the stove.
Embodiment three：
A kind of smelting process of new high rigidity spring steel, comprises the following steps that：
Step A, the producing of raw material；
Step B, the alloying of molten steel；First in the raw material that step A is produced first plus Fe-Mn, afterwards plus si content 1.5-2.0% Fe-Si, finally plus Al；
Step C, the pouring of molten steel, the alloy produced molten steel are cast in the stock mould adding exothermic mixture at rising head in step B；
Step D, the process of spring steel, the steel pouring in step C is carried out blanking → quenching → average tempering → bead.
In described step A, the producing process of raw material is as follows：
1), the drying of ore, puts into ore in oven first and is toasted；
2), the fusing of ore, by step 1) in ore after oxidation be placed in melting furnace and melted, add the CaO of 0.8% weight ratio in fusion process；
3), the oxidation of ore, by step 2) in fusing ore be placed on temperature>In 1550 DEG C of stove, when seething with excitement in molten bath, stir molten steel, so that metal level and slag blanket is floated, remove pernicious gas and field trash in molten steel, the molten steel standing 8min of boiling；
4), the reduction of molten steel, by step 3) molten steel that stands carries out deoxidation treatment.
Described step 3) ore oxidizing process in decarbonization rate>0.6%C/h, decarburized amount>0.3～0.4%, basicity of slag R=2～3, FeO：12～13%, the quantity of slag controls 3～4%.
Described step 4) in deoxidation process as follows：Add the %C pre-deoxidation of the Mn of 0.8 weight %, Si, 0.56-0.64 weight of 1.8 weight % in the molten steel of standing, after the thin slag in molten steel surface is formed, add powdered carbon, silica flour, aluminium block, Ca-Si alloy final deoxidizing.
In deoxidation process, basicity of slag controls FeO content in R=2.5-3.5, slag<O.5%.
In described step D, the processing procedure of spring steel is as follows：First, the spring steel pouring is carried out blanking, after blanking, carry out Quenching Treatment, temperature during quenching is 840-870 DEG C, carries out oil cooling 1h after quenching, the good spring steel of oil cooling is put and is incubated 0.5h in 450 DEG C -500 DEG C again, water drenching cooling 2h after coming out of the stove.
According to embodiment one, two, the high-strength spring intensity of three making, elasticity and quenching degree are higher, spring steel is suitable to rail truck, the flat spring of the larger load or line footpath helical spring in below 30mm is born in the industrial making of automobile and tractor, it is also suitably for making operating temperature below 250 DEG C and car shock mitigation system etc., this kind of spring steel meets the needs of good mechanical property, effectively improve mechanical property and the service life of spring steel using the spring steel that the method makes, make its hardness higher, improve silicon on the basis of carbon steel, the content of manganese makes, improve the hardness of steel, intensity, yield tensile ratio and fatigue strength, silicon has the effect improving steel belt roof bolt stability simultaneously, improve quenching degree and the wearability of steel.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and without departing from the spirit or essential characteristics of the present invention, the present invention can be realized in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is limited by claims rather than described above, it is intended that all changes in the implication and scope of the equivalency of claim that fall are included in the present invention.Any mark in claim should not be considered as limiting involved claim.
In addition, it should be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of specification is only for clarity, those skilled in the art should using specification as an entirety, the technical scheme in each embodiment can also through appropriately combined, formed it will be appreciated by those skilled in the art that other embodiment.
Claims (6)
1. a kind of smelting process of new high rigidity spring steel it is characterised in that：Comprise the following steps that：
Step A, the producing of raw material；
Step B, the alloying of molten steel；First in the raw material that step A is produced first plus Fe-Mn, afterwards plus si content 1.5-2.0% Fe-Si, finally plus Al；
Step C, the pouring of molten steel, the alloy produced molten steel are cast in the stock mould adding exothermic mixture at rising head in step B；
Step D, the process of spring steel, the steel pouring in step C is carried out blanking → quenching → average tempering → bead.
2. a kind of new high rigidity spring steel according to claim 1 smelting process it is characterised in that：In described step A, the producing process of raw material is as follows：
1）, the drying of ore, ore is put in oven toasted first；
2）, the fusing of ore, by step 1）Ore after middle oxidation is placed in melting furnace and is melted, and adds the CaO of 0.5%-1% weight ratio in fusion process；
3）, the oxidation of ore, by step 2）The ore of middle fusing is placed on temperature>In 1550 DEG C of stove, when seething with excitement in molten bath, stir molten steel, so that metal level and slag blanket is floated, remove pernicious gas and field trash in molten steel, the molten steel standing 5-10min of boiling；
4）, the reduction of molten steel, by step 3）The molten steel of standing carries out deoxidation treatment.
3. a kind of new high rigidity spring steel according to claim 2 smelting process it is characterised in that：Described step 3）Decarbonization rate in the oxidizing process of ore>O.6%C/h, decarburized amount>0.3～0.4%, basicity of slag R=2～3, FeO：12～13%, the quantity of slag controls 3～4%.
4. a kind of new high rigidity spring steel according to claim 2 smelting process it is characterised in that：Described step 4）Middle deoxidation process is as follows：Add the %C pre-deoxidation of Si, 0.56-0.64 weight of Mn, 1.5-2 weight % of 0.6-0.9 weight % in the molten steel of the molten steel of standing, after the thin slag in molten steel surface is formed, add powdered carbon, silica flour, aluminium block, Ca-Si alloy final deoxidizing.
5. a kind of new high rigidity spring steel according to claim 4 smelting process it is characterised in that：In deoxidation process, basicity of slag controls FeO content in R=2.5-3.5, slag<O.5%.
6. a kind of new high rigidity spring steel according to claim 1 smelting process it is characterised in that：In described step step D, the processing procedure of spring steel is as follows：First, the spring steel pouring is carried out blanking, after blanking, carry out Quenching Treatment, temperature during quenching is 840-870 DEG C, carries out oil cooling 1-2h after quenching, the good spring steel of oil cooling is put and is incubated 0.5-1h in 450 DEG C -500 DEG C again, water drenching cooling 2-3h after coming out of the stove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610380620.1A CN106399808A (en) | 2016-06-01 | 2016-06-01 | Smelting method of novel high-hardness spring steel |
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| CN201610380620.1A CN106399808A (en) | 2016-06-01 | 2016-06-01 | Smelting method of novel high-hardness spring steel |
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| CN106399808A true CN106399808A (en) | 2017-02-15 |
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| CN201610380620.1A Pending CN106399808A (en) | 2016-06-01 | 2016-06-01 | Smelting method of novel high-hardness spring steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118135A (en) * | 2017-12-19 | 2018-06-05 | 内蒙古北方重工业集团有限公司 | Prevent the method being deformed when spring quenches |
| CN110760656A (en) * | 2019-09-18 | 2020-02-07 | 南京钢铁股份有限公司 | Heat treatment method for producing high-strength SiCrV spring steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57171648A (en) * | 1981-04-14 | 1982-10-22 | Kobe Steel Ltd | Spring steel |
| CN85100662A (en) * | 1985-04-01 | 1986-07-30 | 冶金部钢铁研究总院 | Novel water-quenching spring steel 35SiMnB and manufacturing process thereof |
| CN1118611A (en) * | 1993-12-29 | 1996-03-13 | 浦项综合制铁株式会社 | High strength high toughness spring steel, and manufacturing process therefor |
| CN1265430A (en) * | 2000-02-29 | 2000-09-06 | 济南济钢设计院 | Austenic-bainite Malleable steel and its preparation |
-
2016
- 2016-06-01 CN CN201610380620.1A patent/CN106399808A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57171648A (en) * | 1981-04-14 | 1982-10-22 | Kobe Steel Ltd | Spring steel |
| CN85100662A (en) * | 1985-04-01 | 1986-07-30 | 冶金部钢铁研究总院 | Novel water-quenching spring steel 35SiMnB and manufacturing process thereof |
| CN1118611A (en) * | 1993-12-29 | 1996-03-13 | 浦项综合制铁株式会社 | High strength high toughness spring steel, and manufacturing process therefor |
| CN1265430A (en) * | 2000-02-29 | 2000-09-06 | 济南济钢设计院 | Austenic-bainite Malleable steel and its preparation |
Non-Patent Citations (1)
| Title |
|---|
| 王筱留: "《钢铁冶金学 炼铁部分》", 28 February 2013, 冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118135A (en) * | 2017-12-19 | 2018-06-05 | 内蒙古北方重工业集团有限公司 | Prevent the method being deformed when spring quenches |
| CN110760656A (en) * | 2019-09-18 | 2020-02-07 | 南京钢铁股份有限公司 | Heat treatment method for producing high-strength SiCrV spring steel |
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