CN104988382B - Nodular cast iron gearbox and its manufacture method with ultralow temperature high impact toughness - Google Patents
Nodular cast iron gearbox and its manufacture method with ultralow temperature high impact toughness Download PDFInfo
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- CN104988382B CN104988382B CN201510459235.1A CN201510459235A CN104988382B CN 104988382 B CN104988382 B CN 104988382B CN 201510459235 A CN201510459235 A CN 201510459235A CN 104988382 B CN104988382 B CN 104988382B
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Abstract
The nodular cast iron gearbox with ultralow temperature high impact toughness of the present invention, its chemical analysis and mass percent are：The surplus of C3.50%~3.80%, Si1.7~1.9%, Mn0.10%~0.15%, P≤0.035%, S≤0.015%, Ni1.0%~1.3% is Fe and inevitable impurity.High-purity Q10 pig iron, Q235 carbon structural steels and foundry returns medium-frequency induction furnace are melted during manufacture, nickel plate is added, the percentage of each chemical composition is adjusted；Method nodularization is poured using opening bag, nodulizer, inovulant, coverture are layered dress bag successively；Using secondary current-following inoculation of the current-following inoculation+being bred in bag+when pouring into a mould when coming out of the stove.Elongation and low-temperature impact toughness are improved, matrix is enhanced, it is ensured that rational number of graphite ball and higher Oxygen potential, toughness plasticity is improved, without graphitizing annealing heat treatment, production cost has been saved.
Description
Technical field
The present invention relates to a kind of nodular cast iron gearbox with ultralow temperature high impact toughness and its manufacture method, belong to casting
Make technical field.
Background technology
The toughness of spheroidal graphite cast-iron is typically reduced with the reduction of temperature, can drastically be dropped because of toughness when less than certain temperature
It is low and brittle fracture occur, i.e., so-called ductile-brittle transiton.In recent years, China's track traffic industry is fast-developing, electric locomotive operation
Vast in territory, latitude span is very big, and the temperature in cold district winter can reach less than -40 DEG C, based on locomotive running speed and peace
Consideration on complete, requirement to use for electric locomotive nodular cast iron gearbox low-temperature impact toughness also more and more higher.Chinese Railway is total
The TJ/JW 065-2015 of company《The provisional technical conditions of AC drive locomotive ductile iron gearbox》Just provide, nodular cast iron gearbox
The mechanical performance for possessing QT500-7A as defined in national standard GB/T1348-2009 is not required nothing more than, but also requires to have higher stretch concurrently
Long rate and low-temperature impact toughness, i.e.,：Elongation A >=8%, -40 DEG C of ballistic work average >=4J, monodromes >=3J.Traditional QT500-
7A ductile cast iron materials can not meet this requirement.Although another in national standard GB/T1348-2009 have one to have compared with high/low temperature punching
The QT400-18AL of toughness is hit, gained casting and its attached -40 DEG C of low-temperature impact toughness of casting test block are general up to more than 12J, elongation
Rate is also higher by more than 18%, but its intensity index differs greatly apart from QT500-7A, only tension Rm >=380MPa, surrenders Rp0.2
>=240MPa, and after spheroidization and inoculation is handled, in addition it is also necessary to carry out high-temperature carbonization annealing processing.China 201310114040.4
Number application for a patent for invention discloses a kind of Low-temperature high-tenacity nodular cast iron bearing block and its manufacture method, it is said that magnesium iron can be improved
The low-temperature impact toughness of casting, but the technical scheme is same after the spheroidising of casting process and inoculation, in addition it is also necessary to
High temperature, the graphitizing annealing processing in two stages of low temperature are carried out to casting, complex technical process increases manufacturing cost.
The content of the invention
The purpose of the present invention overcomes the deficiency of above-mentioned prior art to have ultralow temperature high impact toughness there is provided a kind of
Nodular cast iron gearbox and its manufacture method, without carrying out high annealing heat treatment, shorten technological process, reduction production cost,
And can guarantee that pi of strength.
The object of the present invention is achieved like this：A kind of nodular cast iron gearbox with ultralow temperature high impact toughness, its
It is characterised by that its chemical analysis and mass percent are：C3.50%~3.80%, Si 1.7~1.9%, Mn0.10%~
0.15%, P≤0.035%, S≤0.015%, Ni1.0%~1.3%, surplus are Fe and inevitable impurity.
A kind of manufacture method of above-mentioned ultralow temperature impact flexibility cast condition ductile iron gear-box, it is characterised in that take following
Step：
A. melting is handled：High-purity Q10 pig iron, Q235 carbon structural steels and foundry returns medium-frequency induction furnace are melted, iron liquid
After melting down, nickel plate is added, the chemical composition and its mass percent for making iron liquid are：C3.80%~3.85%, Si 0.6~
0.7%, Mn0.10%~0.15%, P≤0.035%, S≤0.02%, Ni1.2%~1.3%, surplus are Fe and inevitable
Impurity, furnace temperature is then risen to 1510~1530 DEG C, come out of the stove after standing 1~3 minute；
B. spheroidising：Method nodularization is poured using opening bag, nodulizer, inovulant, coverture are layered dress bag, ball successively
Agent selects low rare earth ferrosilicomagnesium, and addition is the 1.2% of iron liquid quality；
C. inoculation：Secondary current-following inoculation of the current-following inoculation+being bred in bag+when pouring into a mould when coming out of the stove, wherein：
Current-following inoculation when coming out of the stove uses granularity for 5-10mm Y3 silicon titanate innoculants, relative to the addition of iron liquid
For 2kg/t；
The silicon barium composite inoculant for using granularity for 5-20mm is bred in bag, the addition relative to iron liquid is 3kg/t；
Secondary current-following inoculation uses granularity for the silicon barium composite inoculant of 0.2-0.7mm bismuth-containing during cast, relative to iron
The addition of liquid is 2kg/t.
In order to be better achieved in the purpose of the present invention, above-mentioned steps A, high-purity Q10 pig iron is 60%~70% matter
It is 10%~20% mass parts to measure part, Q235 carbon constructional quality steels, and foundry returns is 20%~30% mass parts, nickel plate addition
For the 1.3% of iron liquid quality.
Coordinated in order to which coverture in the purpose of the present invention, above-mentioned steps B is better achieved using the low silicon covertures of FeSi20
Appropriate perlite covers spheroidization material, and FeSi20 is low, and silicon coverture is covered on nodulizer in two times, and addition is respectively iron
The 0.3% of liquid quality and 0.6%.
Technical scheme, casting is ensureing graphited while reducing its Transition of Brittleness temperature by the low silicon of high-carbon
Degree, improves low-temperature impact toughness；Matrix is enhanced by nickel element；Pass through advanced spheroidization and inoculation technology, it is ensured that rationally
Number of graphite ball and higher Oxygen potential, improve toughness plasticity；With QT500-7A spheroidal graphite cast-iron specified in GB/T1348-2009
Part is compared, with -40 DEG C of low-temperature impact toughness, and its attached casting test block tensile strength keeps 500-510MPa, and elongation reaches 10-20%
While impact value can reach 7-9J, property indices comply fully with the TJ/JW 065-2015 of Chinese Railway parent company《Hand over
Spread the provisional technical conditions of motivation car ductile iron gearbox》Newest regulation.Without graphitizable high temperature annealing heat-treats, so that significantly
Shorten technological process, it is to avoid the energy of removing surface and artificial input after heat treatment process and high temperature, be effectively saved life
Produce cost.
Brief description of the drawings
Fig. 1 pours the layering dress bag schematic diagram of method spheroidising for the open bag of the embodiment of the present invention.
Marked in figure：1- ladle, 2- dykes and dams, 3- spheroidization materials and dress bag order.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
1. production stage
(1) melting is handled
By high-purity mass parts of the Q10 pig iron 60%~70%, the mass parts of Q235 carbon constructional quality steels 10%~20%, melt down
Expect for 20%~30% mass parts, to be melted with medium-frequency induction furnace.After iron liquid is melting down, nickel plate is added, its addition is iron liquid matter
The 1.3% of amount.Then furnace temperature is risen to 1450 DEG C, takes spectrum samples to detect stokehold composition, after being adjusted according to testing result,
1500 DEG C of sample examinations again are warming up to, the control range for adjusting iron liquid chemical composition and its quality percentage is：C3.80%~
3.85%, Si 0.6~0.7%, Mn0.10%~0.15%, P≤0.035%, S≤0.02%, Ni1.2%~1.3% is remaining
Measure as Fe and inevitable impurity.1510~1530 DEG C are warming up to after composition is qualified, is skimmed, insulation goes out after standing 1~3 minute
Stove.
(2) spheroidising
Method nodularization is poured using opening bag.Nodulizer, inovulant, coverture are layered dress bag successively, nodulizer is from low
Rare earth ferrosilicomagnesium, addition is the 1.2% of iron liquid quality.Coverture using the low silicon covertures of FeSi20 with appropriate amount perlite come
Spheroidization material is covered, FeSi20 is low, and silicon coverture is covered on nodulizer in two times, and addition is respectively the 0.3% of iron liquid quality
With 0.6%.
(3) inoculation
Secondary current-following inoculation of the current-following inoculation+being bred in bag+when pouring into a mould when coming out of the stove.Wherein：
Current-following inoculation when coming out of the stove uses granularity for 5-10mm Y3 silicon titanate innoculants, relative to the addition of iron liquid
For 2kg/t；
The silicon barium composite inoculant for using granularity for 5-20mm is bred in bag, the addition relative to iron liquid is 3kg/t；
Secondary current-following inoculation uses granularity for the silicon barium composite inoculant of 0.2-0.7mm bismuth-containing during cast, relative to iron
The addition of liquid is 2kg/t.
2. product result
The gear-box product of six of which batch to repeating by above-mentioned production stage has carried out chemical composition, metallographic
Tissue and mechanical performance detection, it is as a result as follows.
(1) chemical composition testing result
(2) mechanical performance and metallographic structure testing result
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (3)
1. a kind of manufacture method of ultralow temperature impact flexibility cast condition ductile iron gear-box, it is characterised in that take the following steps：
A. melting is handled：High-purity Q10 pig iron, Q235 carbon structural steels and foundry returns medium-frequency induction furnace are melted, iron liquid melts
After clear, nickel plate is added, the chemical composition and its mass percent for making iron liquid are：C3.80%~3.85%, Si 0.6~0.7%,
Mn0.10%~0.15%, P≤0.035%, S≤0.02%, Ni 1.2%~1.3%, surplus is Fe and inevitably miscellaneous
Matter, then rises to 1510~1530 DEG C by furnace temperature, is come out of the stove after standing 1~3 minute；
B. spheroidising：Method nodularization is poured using opening bag, nodulizer, inovulant, coverture are layered dress bag, nodulizer successively
From low rare earth ferrosilicomagnesium, addition is the 1.2% of iron liquid quality；
C. inoculation：Secondary current-following inoculation of the current-following inoculation+being bred in bag+when pouring into a mould when coming out of the stove, wherein：
Current-following inoculation when coming out of the stove uses granularity for 5-10mm Y3 silicon titanate innoculants, and the addition relative to iron liquid is
2kg/t；
The silicon barium composite inoculant for using granularity for 5-20mm is bred in bag, the addition relative to iron liquid is 3kg/t；
Secondary current-following inoculation uses granularity for the silicon barium composite inoculant of 0.2-0.7mm bismuth-containing during cast, relative to iron liquid
Addition is 2kg/t；
D. last output has the nodular cast iron gearbox of ultralow temperature high impact toughness, and its chemical analysis and mass percent are：
C3.50%~3.80%, Si 1.7~1.9%, Mn0.10%~0.15%, P≤0.035%, S≤0.015%, Ni 1.0%
~1.3%, surplus is Fe and inevitable impurity.
2. the manufacture method of ultralow temperature impact flexibility cast condition ductile iron gear-box according to claim 1, its feature exists
In the step A, high-purity Q10 pig iron be 60%~70% mass parts, Q235 carbon constructional quality steels be 10%~
20% mass parts, foundry returns is 20%~30% mass parts, and nickel plate addition is the 1.3% of iron liquid quality.
3. the manufacture method of ultralow temperature impact flexibility cast condition ductile iron gear-box according to claim 1, its feature exists
Coverture covers spheroidization material using the low silicon covertures of FeSi20 with appropriate amount perlite in the step B, and FeSi20 is low
Silicon coverture is covered on nodulizer in two times, and addition is respectively the 0.3% and 0.6% of iron liquid quality.
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| CN201510459235.1A CN104988382B (en) | 2015-07-31 | 2015-07-31 | Nodular cast iron gearbox and its manufacture method with ultralow temperature high impact toughness |
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| CN105886692B (en) * | 2016-04-22 | 2017-09-12 | 锦州捷通铁路机械股份有限公司 | The production technology of 70 DEG C of ultralow-temperature high-toughness spheroidal graphite cast-iron |
| CN109930058B (en) * | 2017-12-19 | 2021-08-10 | 常州朗锐铸造有限公司 | Low-temperature high-strength high-toughness nodular cast iron at minus 40 ℃, preparation method thereof and railway locomotive part |
| CN109988964A (en) * | 2017-12-29 | 2019-07-09 | 中车戚墅堰机车车辆工艺研究所有限公司 | Ductile cast iron material, preparation method and application |
| CN109182891A (en) * | 2018-10-25 | 2019-01-11 | 中车大连机车车辆有限公司 | A kind of non-magnetic ductile cast iron and preparation method thereof |
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| FR2839727B1 (en) * | 2002-05-14 | 2004-06-25 | Technologica Sarl | PROCESS FOR THE PREPARATION AND SHAPING OF CAST IRON PARTS WITH SPHEROIDAL GRAPHITE WITH HIGH MECHANICAL CHARACTERISTICS |
| CN102703802A (en) * | 2012-06-08 | 2012-10-03 | 上海宏钢电站设备铸锻有限公司 | High-strength high-toughness low-temperature-resistant ferritic nodular cast iron |
| CN102864269A (en) * | 2012-10-17 | 2013-01-09 | 齐齐哈尔市精铸良铸造有限责任公司 | Method for preparing low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron |
| CN103160727A (en) * | 2013-04-03 | 2013-06-19 | 山东汇丰铸造科技股份有限公司 | Low-temperature high-tenacity nodular cast iron bearing block and manufacturing method thereof |
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