CN102864268A - Method for preparing austenitic-bainitic high- strength alloy gray iron - Google Patents
Method for preparing austenitic-bainitic high- strength alloy gray iron Download PDFInfo
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Abstract
The invention discloses a method for preparing austenitic-bainitic high-strength alloy gray iron and aims to solve technical problems that prior gray iron is not high in strength and hardness and low in toughness. The preparation method includes adding Q10 pig iron, ductile iron foundry returns and steel scrap to a intermediate frequency furnace, heating the mixture to a molten state, adding ferromolybdenum and electrolytic copper to obtain molten iron, performing inoculation by adding inoculants, adding a purifier and deslagging agents and finally using a method of isothermal salt bath to perform heat treatment to obtain the austenitic-bainitic and high- strength alloy gray iron. According to the method, the obtained austenitic-bainitic and high- strength alloy gray iron is compact in structure and stable in performance, the tensile strength is 600 MPa to 650 MPa after isothermal quenching, the Brinell Hardness is 345HBW to 369HBW, the strength and the hardness are large, the elongation rate is 4% to 5%, the toughness is good, and the method can be widely applied in fields of machinery, machine tools, metallurgy, automobiles and the like.
Description
Technical field
The present invention relates to the preparation method of Pattern Bainite Alloy gray iron difficult to understand.
Background technology
Because graphitic cast iron has unique performance characteristics, therefore in the application of machinery, lathe, metallurgy, automobile and other industries, occupy very important position.Reform and opening-up is over 30 years, and the Production Technique of Gray Cast Iron level of China has obtained large increase.But compare with external advanced country, also exist larger gap.Along with the raising that the industries such as machinery, metallurgy, weaving require casting quality, the demand sharp increase of high-strength gray cast iron, the ten or twenty in past has accumulated a large amount of data to the research of austempered ductile iron both at home and abroad between year, and China has begun to enter the application stage.But to the research of shellfish gray iron difficult to understand, also less both at home and abroad.Because the gray iron of shellfish body matrix difficult to understand is compared with the graphitic cast iron of pearlite matrix, in intensity, wear resistance, there is raising by a relatively large margin the aspect such as shock-absorbing performance and processing performance, therefore the gray iron of shellfish body matrix difficult to understand is expected the newcomer as cast iron, enter industrial application, present existing gray iron, its tensile strength is about 350MPa, unit elongation is almost nil approximately, the highest Brinell hardness is about 250, and tensile strength is low, and hardness is low, unit elongation is low, be not enough to satisfy machinery, lathe, metallurgical, automobile and other industries is to the high request of foundry goods, and it is excellent therefore to study a kind of processing performance, has high strength, the gray iron of high rigidity and good toughness is urgent.
Summary of the invention
The present invention is not high for solving existing strength and hardness, the technical problem of poor toughness, and a kind of preparation method of bainite high-strength degree alloy gray iron difficult to understand is provided.
The preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand of the present invention carries out according to the following steps:
One, the mass fraction by the Q10 pig iron, magnesium iron foundry returns and steel scrap is respectively 60 ~ 70,10 ~ 20 and 10 ~ 20, take by weighing the Q10 pig iron, magnesium iron foundry returns and steel scrap, the ratio of pressing again molybdenum-iron quality and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is (1.5 ~ 1.8): 100, the ratio of pressing electrolytic copper quality and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is (2 ~ 2.2): 100, the quality of pressing silicon titanate innoculant is (0.9 ~ 1.1) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, press CaO-Al
2O
3The quality of base agent for purifying molten steel is (0.3 ~ 0.5) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, the quality of pressing the volcanic ash deslagging agent is (0.5 ~ 0.7) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, take by weighing molybdenum-iron, electrolytic copper, silicon titanate innoculant, CaO-Al
2O
3Base agent for purifying molten steel and volcanic ash deslagging agent;
Two, the Q10 pig iron that successively step 1 is taken by weighing, magnesium iron foundry returns and steel scrap join in the intermediate frequency furnace, are warming up to furnace charge and are molten into liquid state, again to the molybdenum-iron and the electrolytic copper that wherein add step 1 and take by weighing, continuing to be warming up to temperature is 1440 ~ 1460 ℃, leave standstill 2 ~ 4min, come out of the stove, obtain iron liquid;
Three, at the bottom of pouring ladle, add the silicon titanate innoculant that step 1 takes by weighing, add again the CaO-Al that step 1 takes by weighing
2O
3The base agent for purifying molten steel, then the iron liquid that step 2 is obtained is punched in the pouring ladle, be under 1420 ~ 1450 ℃ the condition in temperature, insulation 0.4 ~ 0.6min finishes and breeds, then add the volcanic ash deslagging agent that step 1 takes by weighing, after fully skimming, be to pour into a mould under 1370 ~ 1410 ℃ the condition in teeming temperature, obtain the bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment;
Four, bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment that obtains in the step 3 is packed in the heat treatment furnace, being warming up to temperature is 630 ~ 670 ℃, constant temperature 15 ~ 25min, then continuing to be warming up to temperature is 860 ~ 900 ℃, and be incubated 1 ~ 3h, then take out and put at once temperature and be 280-300 ℃ salt bath, constant temperature 1 ~ 2h, finish thermal treatment, again the bainite high-strength degree alloy gray iron a kind of difficult to understand after the thermal treatment is put into temperature and is 180 ~ 220 ℃ box-type furnace, insulation 20 ~ 40min takes out after cooling to room temperature with the furnace, obtains a kind of bainite high-strength degree alloy gray iron difficult to understand.
Beneficial effect of the present invention
Among the preparation method of the present invention, significantly improve hardness value and the toughness value of gray iron by adding molybdenum element, copper belongs to graphite element, add-on by copper in the control graphitic cast iron, can not only eliminate the Quench tendency of carbide forming element, promote the formation of A type graphite, can also improve the homogeneity of foundry goods microstructure, and element sulphur is the serious graphited element that hinders, when sulphur content is high, cast iron has the tendency that forms spoken parts in traditional operas, and sulphur forms the eutectic (FeS+Fe) of low melting point (985 ℃) at the cast iron crystal boundary, makes cast iron have red brittleness.In addition, sulphur also makes iron casting degenerate, as it is mobile to reduce iron liquid, increase Casting shrinkage etc., therefore high-strength alloy cast iron is tighter to the content requirement of sulphur, be preferably lower than 0.020%, simultaneously preparation method of the present invention has selected the heat treating method of a kind of not only economy but also material benefit, i.e. salt bath austempering, the bainite high-strength degree alloy gray iron a kind of difficult to understand that obtains through preparation method of the present invention, dense structure, stable performance is 600 ~ 650MPa by tensile strength after the isothermal quenching, and Brinell hardness is 345 ~ 360HBW, intensity and hardness are large, unit elongation is 4% ~ 5%, and good toughness can be applied in machinery widely, lathe, metallurgical, the fields such as automobile.
Description of drawings
Fig. 1 is the graphite shape metaloscope photo of the front bainite high-strength degree alloy gray iron sample a kind of difficult to understand of the thermal treatment of test one preparation;
The matrix metaloscope photo of a kind of difficult to understand bainite high-strength degree alloy gray iron of Fig. 2 after for the thermal treatment of test one preparation.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the preparation method of the bainite high-strength degree alloy gray iron a kind of difficult to understand of present embodiment carries out according to the following steps:
One, the mass fraction by the Q10 pig iron, magnesium iron foundry returns and steel scrap is respectively 60 ~ 70,10 ~ 20 and 10 ~ 20, take by weighing the Q10 pig iron, magnesium iron foundry returns and steel scrap, the ratio of pressing again molybdenum-iron quality and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is (1.5 ~ 1.8): 100, the ratio of pressing electrolytic copper quality and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is (2 ~ 2.2): 100, the quality of pressing silicon titanate innoculant is (0.9 ~ 1.1) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, press CaO-Al
2O
3The quality of base agent for purifying molten steel is (0.3 ~ 0.5) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, the quality of pressing the volcanic ash deslagging agent is (0.5 ~ 0.7) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, take by weighing molybdenum-iron, electrolytic copper, silicon titanate innoculant, CaO-Al
2O
3Base agent for purifying molten steel and volcanic ash deslagging agent;
Two, the Q10 pig iron that successively step 1 is taken by weighing, magnesium iron foundry returns and steel scrap join in the intermediate frequency furnace, are warming up to furnace charge and are molten into liquid state, again to the molybdenum-iron and the electrolytic copper that wherein add step 1 and take by weighing, continuing to be warming up to temperature is 1440 ~ 1460 ℃, leave standstill 2 ~ 4min, come out of the stove, obtain iron liquid;
Three, at the bottom of pouring ladle, add the silicon titanate innoculant that step 1 takes by weighing, add again the CaO-Al that step 1 takes by weighing
2O
3The base agent for purifying molten steel, then the iron liquid that step 2 is obtained is punched in the pouring ladle, be under 1420 ~ 1450 ℃ the condition in temperature, insulation 0.4 ~ 0.6min finishes and breeds, then add the volcanic ash deslagging agent that step 1 takes by weighing, after fully skimming, be to pour into a mould under 1370 ~ 1410 ℃ the condition in teeming temperature, obtain the bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment;
Four, bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment that obtains in the step 3 is packed in the heat treatment furnace, being warming up to temperature is 630 ~ 670 ℃, constant temperature 15 ~ 25min, then continuing to be warming up to temperature is 860 ~ 900 ℃, and be incubated 1 ~ 3h, then take out and put at once temperature and be 280-300 ℃ salt bath, constant temperature 1 ~ 2h, finish thermal treatment, again the bainite high-strength degree alloy gray iron a kind of difficult to understand after the thermal treatment is put into temperature and is 180 ~ 220 ℃ box-type furnace, insulation 20 ~ 40min takes out after cooling to room temperature with the furnace, obtains a kind of bainite high-strength degree alloy gray iron difficult to understand.
Among the preparation method of present embodiment, significantly improve hardness value and the toughness value of gray iron by adding molybdenum element, copper belongs to graphite element, add-on by copper in the control graphitic cast iron, can not only eliminate the Quench tendency of carbide forming element, promote the formation of A type graphite, can also improve the homogeneity of foundry goods microstructure, and element sulphur is the serious graphited element that hinders, when sulphur content is high, cast iron has the tendency that forms spoken parts in traditional operas, and sulphur forms the eutectic (FeS+Fe) of low melting point (985 ℃) at the cast iron crystal boundary, makes cast iron have red brittleness.In addition, sulphur also makes iron casting degenerate, as it is mobile to reduce iron liquid, increase Casting shrinkage etc., therefore high-strength alloy cast iron is tighter to the content requirement of sulphur, be preferably lower than 0.020%, the preparation method of present embodiment has selected a kind of not only economy but also economical heat treating method simultaneously, it is salt bath austempering, the bainite high-strength degree alloy gray iron a kind of difficult to understand that obtains through the preparation method of present embodiment, each component content is C:3.1%～3.4%, S :≤0.020%, P :≤0.040%, Mn:0.8% ~ 1.0%, Si:1.5% ~ 1.7%, Mo:0.7% ~ 0.9%, Cu:1.3% ~ 1.6%, dense structure, stable performance, be 600 ~ 650MPa by tensile strength after the isothermal quenching, Brinell hardness is 345 ~ 360HBW, and intensity and hardness are large, and unit elongation is 4% ~ 5%, good toughness can be applied in machinery widely, lathe, metallurgical, the fields such as automobile.
Embodiment two: what present embodiment and embodiment one were different is: ingredient and each composition quality mark are in the steel scrap of step 1: C:0.15% ~ 0.25%, S:0.012% ~ 0.016%, P:0.014% ~ 0.034%, Mn:0.10% ~ 0.30%, Si:0.20% ~ 0.40%, other step is identical with embodiment one with parameter.
Embodiment three: what present embodiment was different from embodiment one or two is: the mass fraction of the Q10 pig iron, magnesium iron foundry returns and steel scrap is respectively 60,20 and 20 in the step 1, and other step is identical with embodiment one or two with parameter.
Embodiment four: one of present embodiment and embodiment one to three be: in the step 1 in the molybdenum-iron massfraction of Mo be 60% ~ 70%, the massfraction of Cu is 99.99%-99.999% in the electrolytic copper, the massfraction of Si is 44%-46% in the efficient silicon titanate innoculant, the massfraction of Ba is 1% ~ 3%, the granularity of silicon titanate innoculant is 0.4 ~ 1mm, and other step is identical with one of parameter and embodiment one to three.
Embodiment five: one of present embodiment and embodiment one to four be: CaO-Al in the step 1
2O
3Main component and each composition quality mark of base agent for purifying molten steel are: Ca:30% ~ 35%, CaO:45% ~ 50%, Al
2O
3: 15% ~ 20%., other step is identical with one of parameter and embodiment one to four.
Embodiment six: what present embodiment was different from one of embodiment one to five is: molybdenum-iron quality, electrolytic copper quality, silicon titanate innoculant quality, CaO-Al in the step 1
2O
3Base agent for purifying molten steel quality and volcanic ash deslagging agent quality are respectively with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 1.6:100,2.1:100,1:100,0.4:100 and 0.6:100, other step is identical with one of embodiment one or five with parameter.
Embodiment seven: one of present embodiment and embodiment one to six be: the step 2 relaying is continuous, and to be warming up to temperature be 1445 ~ 1455 ℃, and time of repose is 3min, and other step is identical with one of parameter and embodiment one to six.
Embodiment eight: what present embodiment was different from one of embodiment one to seven is: breeding temperature in the step 3 is 1430 ~ 1440 ℃, soaking time is 0.5min, teeming temperature is 1380 ~ 1400 ℃, and other step is identical with one of parameter and embodiment one to seven.
Embodiment nine: what present embodiment was different from one of embodiment one to eight is: being warming up to first temperature in the step 4 is 650 ℃, constant temperature 20min, being warming up to temperature is 870 ~ 890 ℃ again, insulation 2h, and other step is identical with one of parameter and embodiment one to eight.
Embodiment ten: what present embodiment was different from one of embodiment one to nine is: being warming up to temperature in the step 4 is 880 ℃ again, and other step is identical with one of parameter and embodiment one to nine.
Embodiment 11: what present embodiment was different from one of embodiment one to ten is: the temperature of salt bath is 285 ~ 295 ℃ in the step 4, constant temperature 1.5h, the temperature of box-type furnace is 200 ℃ in the step 4, soaking time is 30min, and other step is identical with one of parameter and embodiment one to ten.
Embodiment 12: what present embodiment was different from one of embodiment one to ten is: the temperature of box-type furnace is 200 ℃ in the step 4, and soaking time is 30min, and other step is identical with one of parameter and embodiment one to ten.
With following verification experimental verification beneficial effect of the present invention:
The preparation method of test one, a kind of bainite high-strength degree alloy gray iron difficult to understand carries out according to the following steps:
One, the mass fraction by the Q10 pig iron, magnesium iron foundry returns and steel scrap is respectively 60,20 and 20, take by weighing the Q10 pig iron, magnesium iron foundry returns and steel scrap, ratio by the quality of molybdenum-iron and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is 1.6:100 again, ratio by the quality of electrolytic copper and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is 2.1:100, ratio by the quality of silicon titanate innoculant and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is 1:100, presses CaO-Al
2O
3The quality of base agent for purifying molten steel is 0.4:100 with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap, ratio by the quality of volcanic ash deslagging agent and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is 0.6:100, takes by weighing molybdenum-iron, electrolytic copper, silicon titanate innoculant, CaO-Al
2O
3Base agent for purifying molten steel and volcanic ash deslagging agent; Wherein each composition quality mark is in the Q10 pig iron: C:4.30% ~ 4.40%, S:0.012% ~ 0.020%, P:0.033% ~ 0.040%, Mn:0.05% ~ 0.09%, Si:0.83% ~ 0.90%, each composition quality mark is in the magnesium iron foundry returns: C:3.50% ~ 3.60%, S:0.010% ~ 0.016%, P:0.025% ~ 0.035%, Mn:0.15% ~ 0.25%, Si:2.44% ~ 2.60%, composition and each composition quality mark are in the steel scrap: C:0.15% ~ 0.25%, S:0.012% ~ 0.016%, P:0.014% ~ 0.034%, Mn:0.10% ~ 0.30%, Si:0.20% ~ 0.40%, the mass percent of Mo is 60% in the molybdenum-iron, the mass percent of Cu is 99.99% in the electrolytic copper, the mass percent of Si is 46% in the silicon titanate innoculant, the mass percent of Ba is 3%, the mean particle size of efficient silicon titanate innoculant is 0.7mm, CaO-Al
2O
3The base agent for purifying molten steel is DFC-800 type scavenging agent CaO-Al
2O
3The base agent for purifying molten steel;
Two, the Q10 pig iron that successively step 1 is taken by weighing, magnesium iron foundry returns and steel scrap join in the intermediate frequency furnace, are warming up to furnace charge and are molten into liquid state, again to the molybdenum-iron and the electrolytic copper that wherein add step 1 and take by weighing, continuing to be warming up to temperature is 1450 ℃, leave standstill 3min, come out of the stove, obtain iron liquid;
Three, at the bottom of pouring ladle, add the efficient silicon titanate innoculant that step 1 takes by weighing, add again the CaO-Al that step 1 takes by weighing
2O
3The base agent for purifying molten steel, then the iron liquid that step 2 is obtained is punched in the pouring ladle, be under 1430 ℃ the condition in temperature, insulation 0.5min, finish and breed, then add the volcanic ash deslagging agent that step 1 takes by weighing, after fully skimming, be to pour into a mould under 1390 ℃ the condition in teeming temperature, obtain the bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment;
Four, the bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment that obtains in the step 3 is packed in the heat treatment furnace, being warming up to temperature is 650 ℃, constant temperature 20min, then continuing to be warming up to temperature is 880 ℃, and insulation 2h, then take out and put at once temperature and be 290 ℃ salt bath, constant temperature 2h, again the bainite high-strength degree alloy gray iron a kind of difficult to understand after the thermal treatment is put into temperature and is 200 ℃ box-type furnace, insulation 30min, take out after cooling to room temperature with the furnace, obtain a kind of bainite high-strength degree alloy gray iron difficult to understand.
Among the preparation method of this test, significantly improve hardness value and the toughness value of gray iron by adding molybdenum element, copper belongs to graphite element, add-on by copper in the control graphitic cast iron, can not only eliminate the Quench tendency of carbide forming element, promote the formation of A type graphite, can also improve the homogeneity of foundry goods microstructure, and element sulphur is the serious graphited element that hinders, when sulphur content is high, cast iron has the tendency that forms spoken parts in traditional operas, and sulphur forms the eutectic (FeS+Fe) of low melting point (985 ℃) at the cast iron crystal boundary, makes cast iron have red brittleness.In addition, sulphur also makes iron casting degenerate, as it is mobile to reduce iron liquid, increase Casting shrinkage etc., therefore high-strength alloy cast iron is tighter to the content requirement of sulphur, be preferably lower than 0.020%, the preparation method of simultaneously this test has selected a kind of not only economy but also economical heat treating method, it is salt bath austempering, the bainite high-strength degree alloy gray iron a kind of difficult to understand that obtains through the preparation method of this test, each component content is C:3.2%～3.3%, S:0.014%～0.017%, P:0.030% ~ 0.035%, Mn:0.85% ~ 0.88%, Si:1.51% ~ 1.65%, Mo:0.74% ~ 0.78%, Cu:1.35% ~ 1.5%, dense structure, stable performance, be 650MPa by tensile strength after the isothermal quenching, Brinell hardness is 360HBW, and intensity and hardness are large, and unit elongation is 4%, good toughness can be applied in machinery widely, lathe, metallurgical, the fields such as automobile.
Test two, the bainite high-strength degree alloy gray iron a kind of difficult to understand of testing a preparation is carried out the metallographic structure analysis test, process of the test is as follows:
At ambient temperature, adopt 4XB type metaloscope, bainite high-strength degree alloy gray iron sample a kind of difficult to understand before the thermal treatment of testing a preparation is carried out metallographic structure analysis, is to observe the graphite shape metaloscope photo that obtains as shown in Figure 1 in 500 times the situation in magnification
As seen from Figure 1, the graphite state that obtains is A-E type graphite, and graphite is tiny, is evenly distributed.
At ambient temperature, adopt 4XB type metaloscope, bainite high-strength degree alloy gray iron a kind of difficult to understand after the thermal treatment of testing a preparation is carried out metallographic structure analysis, is to observe the matrix metaloscope photo that obtains as shown in Figure 2 in 500 times the situation in magnification
As seen from Figure 2, it is organized as the austenite about 5%, and all the other are acicular bainite, organizes fine and closely wovenly, is evenly distributed.
Test three, the bainite high-strength degree alloy gray iron a kind of difficult to understand of testing a preparation is carried out test for tensile strength and hardness test, process of the test is as follows:
Now according to touchstone: GB/T 228-2002, adopt the CSS-88300 electronic tension tester that the bainite high-strength degree alloy gray iron a kind of difficult to understand of testing a preparation is carried out the tensile strength test, the tensile strength that records the bainite high-strength degree alloy gray iron a kind of difficult to understand of test one preparation is that 650MPa, unit elongation are 4%.
Test four, the bainite high-strength degree alloy gray iron a kind of difficult to understand of testing a preparation is carried out hardness test, process of the test is as follows:
Now according to touchstone: GB/T 231-2002, adopt HB-3000C type Brinell tester, the bainite high-strength degree alloy gray iron a kind of difficult to understand of test one preparation carries out hardness test under the test condition of HBW10/3000/30, and the Brinell hardness number that records the bainite high-strength degree alloy gray iron a kind of difficult to understand of test one is 360HBW.
In sum among the preparation method of this test, significantly improve hardness value and the toughness value of gray iron by adding molybdenum element, copper belongs to graphite element, add-on by copper in the control graphitic cast iron, can not only eliminate the Quench tendency of carbide forming element, promote the formation of A type graphite, can also improve the homogeneity of foundry goods microstructure, and element sulphur is the serious graphited element that hinders, when sulphur content is high, cast iron has the tendency that forms spoken parts in traditional operas, and sulphur forms the eutectic (FeS+Fe) of low melting point (985 ℃) at the cast iron crystal boundary, makes cast iron have red brittleness.In addition, sulphur also makes iron casting degenerate, as it is mobile to reduce iron liquid, increase Casting shrinkage etc., therefore high-strength alloy cast iron is tighter to the content requirement of sulphur, be preferably lower than 0.020%, the preparation method of simultaneously this test has selected the heat treating method of a kind of not only economy but also material benefit, i.e. salt bath austempering, the bainite high-strength degree alloy gray iron a kind of difficult to understand that obtains through the preparation method of this test, dense structure, stable performance is 600 ~ 650MPa by tensile strength after the isothermal quenching, and Brinell hardness is 345 ~ 360HBW, intensity and hardness are large, unit elongation is 4% ~ 5%, and good toughness can be applied in machinery widely, lathe, metallurgical, the fields such as automobile.
Claims (10)
1. the preparation method of a bainite high-strength degree alloy gray iron difficult to understand is characterized in that this preparation method carries out according to the following steps:
One, the mass fraction by the Q10 pig iron, magnesium iron foundry returns and steel scrap is respectively 60 ~ 70,10 ~ 20 and 10 ~ 20, take by weighing the Q10 pig iron, magnesium iron foundry returns and steel scrap, the ratio of pressing again molybdenum-iron quality and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is (1.5 ~ 1.8): 100, the ratio of pressing electrolytic copper quality and the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap is (2 ~ 2.2): 100, the quality of pressing silicon titanate innoculant is (0.9～1.1) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, press CaO-Al
2O
3The quality of base agent for purifying molten steel is (0.3 ~ 0.5) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, the quality of pressing the volcanic ash deslagging agent is (0.5 ~ 0.7) with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 100, take by weighing molybdenum-iron, electrolytic copper, silicon titanate innoculant, CaO-Al
2O
3Base agent for purifying molten steel and volcanic ash deslagging agent;
Two, the Q10 pig iron that successively step 1 is taken by weighing, magnesium iron foundry returns and steel scrap join in the intermediate frequency furnace, are warming up to furnace charge and are molten into liquid state, again to the molybdenum-iron and the electrolytic copper that wherein add step 1 and take by weighing, continuing to be warming up to temperature is 1440 ~ 1460 ℃, leave standstill 2 ~ 4min, come out of the stove, obtain iron liquid;
Three, at the bottom of pouring ladle, add the silicon titanate innoculant that step 1 takes by weighing, add again the CaO-Al that step 1 takes by weighing
2O
3The base agent for purifying molten steel, then the iron liquid that step 2 is obtained is punched in the pouring ladle, be under 1420 ~ 1450 ℃ the condition in temperature, insulation 0.4 ~ 0.6min finishes and breeds, then add the volcanic ash deslagging agent that step 1 takes by weighing, after fully skimming, be to pour into a mould under 1370 ~ 1410 ℃ the condition in teeming temperature, obtain the bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment;
Four, bainite high-strength degree alloy gray iron a kind of difficult to understand before the thermal treatment that obtains in the step 3 is packed in the heat treatment furnace, being warming up to temperature is 630 ~ 670 ℃, constant temperature 15 ~ 25min, then continuing to be warming up to temperature is 860 ~ 900 ℃, and be incubated 1 ~ 3h, then take out and put at once temperature and be 280-300 ℃ salt bath, constant temperature 1 ~ 2h, finish thermal treatment, again the bainite high-strength degree alloy gray iron a kind of difficult to understand after the thermal treatment is put into temperature and is 180 ~ 220 ℃ box-type furnace, insulation 20 ~ 40min takes out after cooling to room temperature with the furnace, obtains a kind of bainite high-strength degree alloy gray iron difficult to understand.
2. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 is characterized in that ingredient and each composition quality mark are in the steel scrap of step 1: C:0.15% ~ 0.25%, S:0.012% ~ 0.016%, P:0.014% ~ 0.034%, Mn:0.10% ~ 0.30%, Si:0.20% ~ 0.40%.
3. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2 is characterized in that the mass fraction of the Q10 pig iron in the step 1, magnesium iron foundry returns and steel scrap is respectively 60,20 and 20.
4. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2, it is characterized in that in the step 1 that the massfraction of Mo is 60% ~ 70% in the molybdenum-iron, the massfraction of Cu is 99.99%-99.999% in the electrolytic copper, the massfraction of Si is 44%-46% in the silicon titanate innoculant, the massfraction of Ba is 1% ~ 3%, and the granularity of silicon titanate innoculant is 0.4 ~ 1mm.
5. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2 is characterized in that CaO-Al in the step 1
2O
3Main component and each composition quality mark of base agent for purifying molten steel are: Ca:30% ~ 35%, CaO:45% ~ 50%, Al
2O
3: 15% ~ 20%.
6. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2 is characterized in that molybdenum-iron quality in the step 1, electrolytic copper quality, silicon titanate innoculant quality, CaO-Al
2O
3Base agent for purifying molten steel quality and volcanic ash deslagging agent quality are respectively with the ratio of the total mass of the Q10 pig iron, magnesium iron foundry returns and steel scrap: 1.6:100,2.1:100,1:100,0.4:100 and 0.6:100.
7. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2 is characterized in that continuous to be warming up to temperature be 1445 ~ 1455 ℃ to the step 2 relaying, and time of repose is 3min.
8. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2, it is characterized in that breeding in the step 3 temperature is 1430 ~ 1440 ℃, and soaking time is 0.5min, and teeming temperature is 1380 ~ 1400 ℃.
9. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2, it is characterized in that being warming up to first in the step 4 temperature is 650 ℃, constant temperature 20min, being warming up to temperature is 880 ℃ again, insulation 2h.
10. the preparation method of a kind of bainite high-strength degree alloy gray iron difficult to understand according to claim 1 and 2, the temperature that it is characterized in that salt bath in the step 4 is 285 ~ 295 ℃, constant temperature 1.5h, the temperature of box-type furnace is 200 ℃, soaking time is 30min.
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| CN104561430A (en) * | 2014-12-12 | 2015-04-29 | 河南万向系统制动器有限公司 | Processing process of gray iron production |
| CN105728573A (en) * | 2016-05-05 | 2016-07-06 | 太仓小小精密模具有限公司 | Production process of impact-resistant die |
| CN114054683A (en) * | 2021-11-30 | 2022-02-18 | 山西汤荣机械制造股份有限公司 | Preparation method of high-strength wear-resistant gray cast iron brake drum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103849753A (en) * | 2014-03-21 | 2014-06-11 | 仪征亚新科双环活塞环有限公司 | YH31 material piston ring isothermal quenching process |
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| CN104561430A (en) * | 2014-12-12 | 2015-04-29 | 河南万向系统制动器有限公司 | Processing process of gray iron production |
| CN105728573A (en) * | 2016-05-05 | 2016-07-06 | 太仓小小精密模具有限公司 | Production process of impact-resistant die |
| CN114054683A (en) * | 2021-11-30 | 2022-02-18 | 山西汤荣机械制造股份有限公司 | Preparation method of high-strength wear-resistant gray cast iron brake drum |
| CN114054683B (en) * | 2021-11-30 | 2023-06-02 | 山西汤荣机械制造股份有限公司 | Preparation method of high-strength wear-resistant gray cast iron brake drum |
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