CN105018833A - Isothermal quenching ductile cast iron and method for producing end of propelling rod through isothermal quenching ductile cast iron - Google Patents
Isothermal quenching ductile cast iron and method for producing end of propelling rod through isothermal quenching ductile cast iron Download PDFInfo
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Abstract
The invention discloses isothermal quenching ductile cast iron and a method for producing the end of a propelling rod through the isothermal quenching ductile cast iron. The isothermal quenching ductile cast iron is composed of, by weight, 3.40%-3.80% of carbon, 2.30%-2.70% of silicon, 0%-0.35% of manganese, 0%-0.04% of phosphorus, 0%-0.02% of sulfur, 0.03%-0.05% of magnesium, 0.3%-0.5% of copper, 0.50%-0.80% of nickel and the balance iron. The method for producing the end of the propelling rod through the isothermal quenching ductile cast iron includes the following steps of a, ductile cast iron preparation; b, cast molding; c, blank treatment; d, machining; e, isothermal quenching treatment; and f, detection. According to the step of detection, hardness testing is conducted on the end of the propelling rod, and if testing is qualified, a finished product can be obtained. According to the isothermal quenching ductile cast iron and the method for producing the end of the propelling rod through the isothermal quenching ductile cast iron, the end of the propelling rod is produced through the isothermal quenching ductile cast iron, so that the end is lower in weight and more portable; moreover, the amount of scrap iron which is machined off from the blank to the finished product of a workpiece is much less, and the hardness can meet the operating requirement; moreover, toughness is good, breaking off is not liable to happen, and the service life of the workpiece is greatly prolonged.
Description
Technical field
The invention belongs to technical field of metal material preparation, specifically, relate to a kind of method of austempored ductile iron and production distance rod termination thereof.
Background technology
Distance rod (comprising V-type distance rod and straight distance rod), be by termination, shaft, spherical pin, jump ring, end cap forms.The effect of distance rod prevents bridge to be shifted, general straight distance rod can only prevent from being shifted before and after middle back axle, and V-type distance rod is shifted before and after middle back axle except preventing, left and right sidesing shifting can also be prevented, because when automobile turning, middle back axle may produce the problem of left and right sidesing shifting, causes leaf spring and tire to produce and rubs, and tire can be caused time serious early to grind the severe accident of even blowing out.In the past, distance rod termination part is by No. 45 steel makings, and carries out modified and hard surfacing thermal treatment.Its hardness is Brinell hardness HB320-370.Because distance rod is applied to double-bridge vehicle, and double-bridge vehicle is mainly used in mine, on earth and rock works, service condition is severe, and automobile overload is serious, part ruptures very soon, loses efficacy, and the termination of No. 45 steel makings is heavy, blank machining amount after forging is large, and waste of material is serious, do not meet national industry lightweight policy
In order to the requirement of satisfied national bogie lightweight policy, with regard to bogie distance rod termination, this to tensile strength, plastic elongation intensity, fatigue strength requires that high part is badly in need of selecting a kind of new material to replace No. 45 steel always used in the past.
Summary of the invention
For solving above technical problem, the object of the present invention is to provide a kind of method of austempored ductile iron and production distance rod termination thereof, distance rod termination quality is obtained lighter by austempored ductile iron material produce, and the iron filings that workpiece machines away from blank to finished product are less, hardness requirement can meet service requirements, and good toughness, not frangibility, substantially increase the work-ing life of workpiece.
The present invention seeks to a kind of austempored ductile iron realized like this, its key is to form primarily of the chemical composition of following weight percent:
Carbon 3.40 ~ 3.80%,
Silicon 2.30 ~ 2.70%,
Manganese≤0.35%,
Phosphorus≤0.04%,
Sulphur≤0.02%,
Magnesium 0.03 ~ 0.05%,
Chromium≤0.013%,
Mix western native RE≤0.029%,
All the other are iron.
Preferably, above-mentioned a kind of austempored ductile iron, is made up of the chemical composition of following weight percent:
Carbon 3.40 ~ 3.80%,
Silicon 2.30 ~ 2.70%,
Manganese≤0.35%,
Phosphorus≤0.04%,
Sulphur≤0.02%,
Magnesium 0.03 ~ 0.05%,
Chromium≤0.013%,
Mix western native RE≤0.029%,
Copper 0.3 ~ 0.5%,
Nickel 0.5 ~ 0.8%,
All the other are iron.
Utilize above-mentioned austempored ductile iron to produce a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The following condition of chemical composition demand fulfillment of described ductile iron liquid: carbon 3.40 ~ 3.6 ~ 3.80%, silicon 2.30 ~ 2.5 ~ 2.70%, manganese≤0.2%≤0.35%, phosphorus≤0.035%≤0.04%, sulphur≤0.02%, magnesium 0.03 ~ 0.05%, chromium≤0.013%, mix western native RE≤0.029%, all the other are for iron;
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination;
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, and pearlitic content is greater than 80%; Spheroidization of graphite grade is 1 grade ~ 3 grades; Graphite order of magnitude 5 grades ~ 7 grades, number of graphite ball >=150/millimeter, Oxygen potential >=85%;
D, blank treatment: described cast blank is carried out deburring, polished finish;
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination;
F, means of isothermal quenching: described distance rod termination is heated under the austenitizing temperature of 880 ~ 900 DEG C; Means of isothermal quenching at 360 ~ 380 DEG C, ductile cast iron material is austempored ductile iron material after means of isothermal quenching;
G, detection: hardness test is carried out to the described distance rod termination after means of isothermal quenching, gets product at Brinell hardness scope/HBW270--340.
Preferably, when ductile cast iron casting wall thickness is greater than 30mm, prepare to described step a in the ductile iron liquid of spheroidal graphite cast iron and add copper and mickel simultaneously, the following condition of chemical composition demand fulfillment of described ductile iron liquid: carbon 3.40 ~ 3.6 ~ 3.80%, silicon 2.30 ~ 2.5 ~ 2.70%, manganese≤0.2%≤0.35%, phosphorus≤0.035%≤0.04%, sulphur≤0.02%, magnesium 0.03 ~ 0.05%, chromium≤0.013%, mix western native RE≤0.029%, copper 0.3 ~ 0.5%, nickel 0.50 ~ 0.80%, all the other are iron, its objective is the perviousness increasing quenching when being isothermal quenching, to ensure the tensile strength of product, two performances of plastic elongation intensity reach optimum value simultaneously.
Preferably, in above-mentioned steps a, the tapping temperature of iron liquid is 1480 ~ 1500 DEG C.
Preferably, in above-mentioned steps f, under austenitizing temperature, heating treatment time is 1 ~ 3h, and the means of isothermal quenching time is 1 ~ 3h.
Preferably, in above-mentioned steps f, same temperature hardening heat treatment is carried out in distance rod termination in salt bath, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
One, simultaneous test:
1, No. 45 steel distance rod termination of making, its blank weight is 4.782 kilograms, and the weight of finished product is 3.139 kilograms, machines away iron filings weight and is: 4.782-3.139=1.643 kilogram;
2, the distance rod termination of austempored ductile iron production, its blank weight is 3.2 kilograms, and the weight of finished product is 2.75 kilograms, machines away iron filings weight and is: 3.2-2.75=0.45 kilogram;
3, the light 3.139-2.75=0.389 kilogram of distance rod termination finished product that the distance rod termination finished product that austempored ductile iron is produced is produced than No. 45 steel, iron filings 1.643-0.45=1.193 kilogram to be machined away less, from the whole nation, mine vehicle, engineering truck is all everywhere, 6, each car, 12 terminations, as produced distance rod termination with No. 45 steel, each car will slattern steel 0.389*12=4.668 kilogram, and the distance rod termination using austempored ductile iron to produce will reduce the waste of steel, meet national bogie lightweight policy simultaneously.
(1) tensile strength is high, plasticity good.
(2) light, the density of quality and intensity ratio (ρ/Rm) little, austempored ductile iron density is 7.1g/cm3, and steel is 7.8g/cm3, therefore same size parts, and austempored ductile iron is lighter than steel by about 10%.
(3) fatigue strength and contact fatigue strength high, dynamic behavior is good.
Two, detected result:
1, material tests: as shown in Figure 1, the metallographic structure of the distance rod termination after means of isothermal quenching is acicular ferrite+rich carbon austenitic+globular graphite; Its mechanical property is: tensile strength sigma b is 900-1028N/mm
3, elongation δ is 8-10%, Brinell hardness HB is 270 ~ 340.
2, actual verification:
It is on the car of 66 and No. 23 that the distance rod assembly being provided with the termination that austempored ductile iron is produced qualified is after testing contained in license number, be separately installed with the distance rod assembly 3 that austempored ductile iron is produced, the distance rod assembly 3 that No. 45 steel are produced, after 1 year working time, No. 66 cars run 41052km, No. 23 cars run 39763km, then open and inspect, result is as follows:
Installing No. 45 steel distance rod assemblies: rupture 3 times in No. 66 car terminations, ruptures 2 times in No. 23 car terminations;
The distance rod assembly that austempored ductile iron is produced is installed: phenomenon of rupture does not appear in No. 66 car terminations, and phenomenon of rupture does not appear in No. 23 car terminations, and can continues to use.
Practice further demonstrates the termination that austempored ductile iron is produced, and the commercial car of commercial car and cubic metre of earth and stone building site that the application on distance rod assembly can meet mine is completely to the service requirements of the termination on distance rod assembly.The termination on doube bridge bogie distance rod assembly is produced in application austempored ductile iron (ADI), the tensile strength that greatly can improve this kind of part is high, fatigue strength, yield strength, its work-ing life be the 2-3 of 45 steel doubly, and the distance rod termination of ductile iron production of being quenched by isothermal, its plastic elongation intensity and fatigue strength higher, dynamic behavior is good, not easy fracture, and each austempored ductile iron termination is lighter 0.389 kilogram than No. 45 steel terminations, each car 12 termination, altogether want light 0.389 × 12=4.668 kilogram, to be that country saves a large amount of metallic substance every year, save a large amount of maintenance costs and servicing time simultaneously, its economic benefit and social benefit highly significant.
Beneficial effect:
The method of a kind of austempored ductile iron of the present invention and production distance rod termination thereof, distance rod termination quality is obtained lighter by austempored ductile iron material produce, and the iron filings that workpiece machines away from blank to finished product are less, hardness requirement can meet service requirements, and good toughness, not frangibility, substantially increases the work-ing life of workpiece.
Accompanying drawing explanation
Fig. 1 is the micro-metallographic structure figure (500X, 5% nitric acid alcohol etch) of finished product distance rod termination.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1500 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.6%, silicon 2.5%, manganese 0.3%, phosphorus 0.02%, sulphur 0.02%, magnesium 0.04%, chromium 0.012%, mix western native RE0.025%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, pearlitic content 81%; Graphite is mainly based on spherical: spheroidization of graphite grade is 2 grades; Graphite order of magnitude 6 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 2h is heated in described distance rod termination under the austenitizing temperature of 900 DEG C; Means of isothermal quenching 2h at 380 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 900N/mm
3, elongation δ is 9%, Brinell hardness HB is 270.
Embodiment 2:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1490 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.50%, silicon 2.60%, manganese 0.34%, phosphorus 0.03%, sulphur 0.02%, magnesium 0.04%, chromium 0.013%, mix western native RE0.027%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, pearlitic content 80%; Graphite is mainly based on spherical: spheroidization of graphite grade is 2 grades; Graphite order of magnitude 6 grades, number of graphite ball 210/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 2h is heated in described distance rod termination under the austenitizing temperature of 890 DEG C; Means of isothermal quenching 2h at 380 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 1000N/mm
3, elongation δ is 8%, Brinell hardness HB is 310.
Embodiment 3:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1500 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.60%, silicon 2.70%, manganese 0.30%, phosphorus 0.02%, sulphur 0.02%, magnesium 0.04%, chromium 0.013%, mix western native RE0.028%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, pearlitic content 81%; Graphite is mainly based on spherical: spheroidization of graphite grade is 2 grades; Graphite order of magnitude 6 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 2h is heated in described distance rod termination under the austenitizing temperature of 900 DEG C; Means of isothermal quenching 2h at 380 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 1028N/mm
3, elongation δ is 10%, Brinell hardness HB is 320.
Embodiment 4:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1480 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.40%, silicon 2.60%, manganese 0.2%, phosphorus 0.035%, sulphur 0.01%, magnesium 0.03%, chromium 0.013%, mix western native RE0.028%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, and pearlitic content is greater than 80%; Graphite is mainly based on spherical: spheroidization of graphite grade is 2 grades; Graphite order of magnitude 6 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 3h is heated in described distance rod termination under the austenitizing temperature of 890 DEG C; Means of isothermal quenching 3h at 370 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 1025N/mm
3, elongation δ is 10%, Brinell hardness HB is 340.
Embodiment 5:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1490 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.80%, silicon 2.70%, manganese 0.35%, phosphorus 0.04%, sulphur 0.005%, magnesium 0.05%, chromium 0.013%, mix western native RE0.028%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, and pearlitic content is greater than 80%; Graphite is mainly based on spherical: spheroidization of graphite grade is 2 grades; Graphite order of magnitude 6 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 1.5h is heated in described distance rod termination under the austenitizing temperature of 900 DEG C; Means of isothermal quenching 1.5h at 380 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 900N/mm
3, elongation δ is 8%, Brinell hardness HB is 290.
Embodiment 6:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1480 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.40%, silicon 2.30%, manganese 0.10%, phosphorus 0.01%, sulphur 0.005%, magnesium 0.03%, chromium 0.003%, mix western native RE0.009%, copper 0.3%, nickel 0.5%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, pearlitic content 82%; Graphite is mainly based on spherical: spheroidization of graphite grade is 3 grades; Graphite order of magnitude 7 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 1.5h is heated in described distance rod termination under the austenitizing temperature of 880 DEG C; Means of isothermal quenching 1.5h at 370 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 1028N/mm
3, elongation δ is 10%, Brinell hardness HB is 320.
Embodiment 7:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1500 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.80%, silicon 2.70%, manganese 0.35%, phosphorus 0.04%, sulphur 0.02%, magnesium 0.05%, chromium 0.013%, mix western native RE0.029%, copper 0.5%, nickel 0.8%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination.
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, pearlitic content 85%; Graphite is mainly based on spherical: spheroidization of graphite grade is 3 grades; Graphite order of magnitude 7 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 3h is heated in described distance rod termination under the austenitizing temperature of 900 DEG C; Means of isothermal quenching 3h at 380 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 1021N/mm
3, elongation δ is 9%, Brinell hardness HB is 320.
Embodiment 8:
Austempored ductile iron produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove, the tapping temperature of iron liquid is 1490 DEG C; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The degree of each chemical composition of described ductile iron liquid is: carbon 3.50%, silicon 2.50%, manganese 0.2%, phosphorus 0.03%, sulphur 0.01%, magnesium 0.04%, chromium 0.01%, mix western native RE0.025%, copper 0.4%, nickel 0.7%, all the other are for iron.
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination;
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, pearlitic content 85%; Graphite is mainly based on spherical: spheroidization of graphite grade is 3 grades; Graphite order of magnitude 7 grades, number of graphite ball 200/millimeter, Oxygen potential >=85%.
D, blank treatment: described cast blank is carried out deburring, polished finish.
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination.
F, means of isothermal quenching: 2h is heated in described distance rod termination under the austenitizing temperature of 900 DEG C; Means of isothermal quenching 2h at 380 DEG C, ductile cast iron material is austempored ductile iron material carry out means of isothermal quenching in salt bath after, and quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
G, detection: carry out hardness test to the described distance rod termination after means of isothermal quenching, qualifiedly get product.
Products obtained therefrom tensile strength sigma b is 1020N/mm
3, elongation δ is 10%, Brinell hardness HB is 330.
Claims (7)
1. an austempored ductile iron, is characterized in that the chemical composition primarily of following weight percent forms:
Carbon 3.40 ~ 3.80%,
Silicon 2.30 ~ 2.70%,
Manganese≤0.35%,
Phosphorus≤0.04%,
Sulphur≤0.02%,
Magnesium 0.03 ~ 0.05%,
Chromium≤0.013%,
Mix western native RE≤0.029%,
All the other are iron.
2. a kind of austempored ductile iron according to claim 1, is characterized in that: be made up of the chemical composition of following weight percent:
Carbon 3.40 ~ 3.80%,
Silicon 2.30 ~ 2.70%,
Manganese≤0.35%,
Phosphorus≤0.04%,
Sulphur≤0.02%,
Magnesium 0.03 ~ 0.05%,
Chromium≤0.013%,
Mix western native RE≤0.029%,
Copper 0.3 ~ 0.5%,
Nickel 0.5 ~ 0.8%,
All the other are iron.
3. austempored ductile iron according to claim 1 produces a method for distance rod termination, it is characterized in that being made up of following steps:
A, prepare spheroidal graphite cast iron: first smelting iron liquid, then come out of the stove; Then spheroidizing and inoculation are carried out to iron liquid, obtain ductile iron liquid; The following condition of chemical composition demand fulfillment of described ductile iron liquid: carbon 3.40 ~ 3.6 ~ 3.80%, silicon 2.30 ~ 2.5 ~ 2.70%, manganese≤0.2%≤0.35%, phosphorus≤0.035%≤0.04%, sulphur≤0.02%, magnesium 0.03 ~ 0.05%, chromium≤0.013%, mix western native RE≤0.029%, all the other are for iron;
B, cast molding: the cast blank described ductile iron liquid being poured into distance rod termination;
C, inspection: metallographic structure inspection is carried out to the cast blank of distance rod termination, spheroidal graphite cast iron as-cast microstructure is perlite, and pearlitic content is greater than 80%; Spheroidization of graphite grade is 1 grade ~ 3 grades; Graphite order of magnitude 5 grades ~ 7 grades, number of graphite ball >=150/millimeter, Oxygen potential >=85%;
D, blank treatment: described cast blank is carried out deburring, polished finish;
E, mechanical workout: the cast blank after process is carried out mechanical workout shaping, form distance rod termination;
F, means of isothermal quenching: described distance rod termination is heated under the austenitizing temperature of 880 ~ 900 DEG C; Means of isothermal quenching at 360 ~ 380 DEG C, ductile cast iron material is austempored ductile iron material after means of isothermal quenching;
G, detection: hardness test is carried out to the described distance rod termination after means of isothermal quenching, gets product at Brinell hardness scope/HBW270--340.
4. the method for a kind of austempored ductile iron according to claim 3 and production distance rod termination thereof, it is characterized in that: when ductile cast iron casting wall thickness is greater than 30mm, described step a prepares in the ductile iron liquid of spheroidal graphite cast iron and adds copper and mickel simultaneously, the following condition of chemical composition demand fulfillment of described ductile iron liquid: carbon 3.40 ~ 3.6 ~ 3.80%, silicon 2.30 ~ 2.5 ~ 2.70%, manganese≤0.2%≤0.35%, phosphorus≤0.035%≤0.04%, sulphur≤0.02%, magnesium 0.03 ~ 0.05%, chromium≤0.013%, mix western native RE≤0.029%, copper 0.3 ~ 0.5%, nickel 0.50 ~ 0.80%, all the other are iron.
5. the method for a kind of austempored ductile iron according to claim 3 and production distance rod termination thereof, is characterized in that: in described step a, the tapping temperature of iron liquid is 1480 ~ 1500 DEG C.
6. the method for a kind of austempored ductile iron according to claim 3 and production distance rod termination thereof, it is characterized in that: in described step f, under austenitizing temperature, heating treatment time is 1 ~ 3h, the means of isothermal quenching time is 1 ~ 3h.
7. the method for a kind of austempored ductile iron according to claim 3 and production distance rod termination thereof, it is characterized in that: in described step f, same temperature hardening heat treatment is carried out in distance rod termination in salt bath, quenchant is saltpetre and SODIUMNITRATE, and the ratio of weight and number that described saltpetre and SODIUMNITRATE are added is 1: 1.
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