CN101660084B - Engine camshaft chilled cast iron and manufacturing method thereof - Google Patents
Engine camshaft chilled cast iron and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an engine camshaft chilled cast iron and a manufacturing method thereof, comprising following steps: A. molding; B. batching: 50-55% of steel scrap, 8-12% of pig iron, 28-37% of foundry returns, 2.2% of graphite electrode, 0.45% of elements and iron alloy-copper, 3.2% of silicon iron and 0.85% of ferrochrome; C. melting: comprising the following substeps: a. adding the above ingredients according to a certain sequence in turn; b. melting liquid iron; c. superheating and standing; and d. inoculating; D: pouring the liquid iron obtained in the step C; E: cooling and opening a box; F: cleaning sand; and G: detecting camshaft parts. In the engine camshaft chilled cast iron of the invention, the depth and hardness of a chilled layer is effectively controlled and the wearing resistance, galling force resistance, adhesiveness resistance and anti-strip toughness are fine, thereby satisfying the requirements of high speed and high load and alternating exchange load, needing no subsequent quenching and hardening treatment, saving work time and lowering cost.
Description
Technical field
The present invention relates to a kind of chilled cast iron, particularly relate to a kind of engine camshaft chilled cast iron.
The invention still further relates to the manufacture method of above-mentioned engine camshaft chilled cast iron.
Background technology
Camshaft is one of key part of oil engine, is the strength member that opens and closes the cylinder valve in the oil engine, and the wear resistance of its cam part directly influences the performance of oil engine.During work, the cam working face of camshaft closely contacts with the valve tappet end face, forms a pair of friction pair.When the camshaft high speed rotating, fatigue wear can take place in the working face of cam, and when abrasion loss surpassed a certain value, the valve clearance was excessive, and valve-opening time is delayed and not exclusively, engine performance significantly descends.Because wear rate and wear surface hardness are inversely proportional to, so the hardness of cam of camshaft working face is most important.
But the difficult control of the existing chilled cast iron alloy camshaft or the chill degree of depth, cam hardness does not reach attrition resistant requirement, or needs the follow-up treatment process of hardening.Present camshaft chilled cast iron generally all exists wear resistance poor, and the obdurability of anti scuffing power, block resistance and antistripping is poor, can not satisfy the requirement under high speed high-load and the stress alternation operating mode fully.And such chilled cast iron all needs to carry out follow-up quench hardening treatment process, makes man-hour longer, and cost is higher.
Summary of the invention
The present invention finishes in order to solve deficiency of the prior art, the purpose of this invention is to provide and a kind ofly can effectively control the chill degree of depth and hardness, the toughness and tenacity of wear resistance, anti scuffing power, block resistance and antistripping is very good, satisfy requirement under high speed high-load and the stress alternation operating mode fully, and do not need follow-up quench hardening treatment process, save man-hour, the engine camshaft chilled cast iron that reduces cost.
A kind of engine camshaft chilled cast iron of the present invention, it makes by following steps: the A. moulding: place chill, filtering net, check, clear up sand mold, be about to contoured chill and be placed on cam cold shock district, contoured chill width and cam peach are wide, nose part chill thickness be cam peach external diameter 2.5-3.5 doubly, cam transition section chill thickness be cam peach external diameter 1.5-3 doubly; Thickness is in the smooth-going transition of different zones; Sand mold requires smooth, and mold cavity surface and joint face are level and smooth, and sand mold does not have disappearance;
B. prepare burden: steel scrap 50-55%, pig iron 8-12%, foundry returns 28-35%, carburelant 2.2% (Graphite Electrodes), element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy;
C. melting: use medium-frequency induction furnace, control voltage 660V, power≤600KW, water coolant electric conductivity≤50 μ S/cm comprises that following substep: a. adds carburelant, end alloy, the pig iron, foundry returns and steel scrap in order successively; B. melting molten iron; C. superheating and standing: the molten iron of fusing is heated to 1540 ℃, and outage is left standstill to 1480 ℃ then; D. breed: add the described alloy that breeds: iron 0.35%+ copper 0.15%+ ferrochrome 0.25%, the control molten iron temperature kept 30-35 minute at 1460-1500 ℃, wherein after breeding 20 minutes molten iron was carried out sampling Detection and adjusted according to assay;
D: the molten iron that the C step obtains is poured into a mould, and teeming temperature is controlled at 1320 ℃-1379 ℃, the control duration of pouring≤22 second/mould;
E: cooling is unpacked, and unpacks after cooling time, is controlled at cooling time 45-65 minute;
F: sand removal;
G: the axle part detects: comprise that step a. spectrum analyzer is detected as that to be divided into composition be C 3.0%～3.4%; Si 2.0%～2.4%; Mn 0.6%～0.9%; P≤0.15%; S≤0.12%; Cu 0.2%～0.5%; Cr≤0.5% and step b. tensile test machine testing tensile strength.
A kind of engine camshaft chilled cast iron of the present invention, in terms of existing technologies, because it is made by above-mentioned steps, through test, the cam of camshaft Tao Jian district chill degree of depth that such engine camshaft chilled cast iron is made is controlled at 7-10mm, and Hardness Control is in 52-60HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 43-50HRC.Nose chill tissue: ledeburite, shred or granular pearlite, needle-like cementite, a small amount of point graphite; Cam transition area chill tissue: ledeburite, perlite, cementite, a small amount of flake graphite.Through engine pedestal and actual road test, the toughness and tenacity of the camshaft wear resistance that this kind chilled cast iron is made, anti scuffing power, block resistance, antistripping is very good, satisfies the requirement under high speed high-load and the stress alternation operating mode fully.And effectively controlled the chill degree of depth and hardness, and need not the follow-up treatment process of hardening, save man-hour, cost is low.
Another object of the present invention provides a kind ofly can effectively control the chill degree of depth and hardness, the toughness and tenacity of wear resistance, anti scuffing power, block resistance and antistripping is very good, satisfy requirement under high speed high-load and the stress alternation operating mode fully, and do not need follow-up quench hardening treatment process, save man-hour, the manufacture method of the camshaft chilled cast iron that reduces cost.
The manufacture method of a kind of engine camshaft chilled cast iron of the present invention may further comprise the steps:
A. moulding: place chill, filtering net, check, clear up sand mold, be about to contoured chill and be placed on cam cold shock district, contoured chill width and cam peach are wide, nose part chill thickness be cam peach external diameter 2.5-3.5 doubly, cam transition section chill thickness be cam peach external diameter 1.5-3 doubly; Thickness is in the smooth-going transition of different zones; Sand mold requires smooth, and mold cavity surface and joint face are level and smooth, and sand mold does not have disappearance;
B. prepare burden: steel scrap 50-55%, pig iron 8-12%, foundry returns 28-35%, carburelant 2.2% (Graphite Electrodes), element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy;
C. melting: use medium-frequency induction furnace, control voltage 660V, power≤600KW, water coolant electric conductivity≤50 μ S/cm comprises that following substep: a. adds carburelant, end alloy, the pig iron, foundry returns and steel scrap in order successively; B. melting molten iron; C. superheating and standing: the molten iron of fusing is heated to 1540 ℃, and outage is left standstill to 1480 ℃ then; D. breed: add the described alloy that breeds: iron 0.35%+ copper 0.15%+ ferrochrome 0.25%, the control molten iron temperature kept 30-35 minute at 1460-1500 ℃, wherein after breeding 20 minutes molten iron was carried out sampling Detection and adjusted according to assay;
D: the molten iron that the C step obtains is poured into a mould, and teeming temperature is controlled at 1320 ℃-1379 ℃, the control duration of pouring≤22 second/mould;
E: cooling is unpacked, and unpacks after cooling time, is controlled at cooling time 45-65 minute;
F: sand removal;
G: the axle part detects: comprise that step a. spectrum analyzer detects composition and step b. tensile test machine testing tensile strength.
Through test, the cam of camshaft Tao Jian district chill degree of depth that the engine camshaft chilled cast iron that aforesaid method makes is made is controlled at 7-10mm, and Hardness Control is in 52-60HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 43-50HRC.Nose chill tissue: ledeburite, shred or granular pearlite, needle-like cementite, a small amount of point graphite; Cam transition area chill tissue: ledeburite, perlite, cementite, a small amount of flake graphite.Through engine pedestal and actual road test, the toughness and tenacity of the camshaft wear resistance that this kind method manufacturing chilled cast iron is made, anti scuffing power, block resistance, antistripping is very good, satisfies the requirement under high lotus of high speed and the stress alternation operating mode fully.And effectively controlled the chill degree of depth and hardness, and need not the follow-up treatment process of hardening, save man-hour, cost is low.
Embodiment
Below engine camshaft chilled cast iron of the present invention and manufacture method thereof are described in further detail.
A kind of engine camshaft chilled cast iron of the present invention, it makes by following steps: the A. moulding: place chill, filtering net, check, clear up sand mold, be about to contoured chill and be placed on cam cold shock district, contoured chill width and cam peach are wide, nose part chill thickness be cam peach external diameter 2.5-3.5 doubly, cam transition section chill thickness be cam peach external diameter 1.5-3 doubly; Thickness is in the smooth-going transition of different zones; Sand mold requires smooth, and mold cavity surface and joint face are level and smooth, and sand mold does not have disappearance;
B. prepare burden: steel scrap 50-55%, pig iron 8-12%, foundry returns 28-35% (confirming), carburelant 2.2% (Graphite Electrodes), element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy.It is even that this breeds alloy ingredient, rational size distribution, and diffusion easily in molten iron, add-on is few, and is easy to use, and effect stability is grown about ten minutes than the fall time that common ferrosilicon breeds, and improves eutectic cell rank one-level, improves tensile strength 10-15MPa;
C. melting: use medium-frequency induction furnace, control voltage 660V, power≤600KW, water coolant electric conductivity≤50 μ S/cm comprises that following substep: a. adds carburelant, end alloy, the pig iron, foundry returns and steel scrap in order successively; B. melting molten iron; C. superheating and standing: the molten iron of fusing is heated to 1540 ℃, and outage is left standstill to 1480 ℃ then; D. breed: add the described alloy that breeds: iron 0.35%+ copper 0.15%+ ferrochrome 0.25%, the control molten iron temperature kept 30-35 minute at 1460-1500 ℃, wherein after breeding 20 minutes molten iron was carried out sampling Detection and adjusted according to assay;
D: the molten iron that the C step obtains is poured into a mould, and teeming temperature is controlled at 1320 ℃-1379 ℃, the control duration of pouring≤22 second/mould;
E: cooling is unpacked, and unpacks after cooling time, is controlled at cooling time 45-65 minute;
F: sand removal;
G: the axle part detects: comprise that step a. spectrum analyzer is detected as that to be divided into composition be C 3.0%～3.4%; Si 2.0%～2.4%; Mn 0.6%～0.9%; P≤0.15%; S≤0.12%; Cu 0.2%～0.5%; Cr≤0.5% and step b. tensile test machine testing tensile strength, the tensile strength of this tensile test machine testing is
Through test, the cam of camshaft Tao Jian district chill degree of depth that such engine camshaft chilled cast iron is made is controlled at 7-10mm, and Hardness Control is in 52-60HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 43-50HRC.Nose chill tissue: ledeburite, shred or granular pearlite, needle-like cementite, a small amount of point graphite; Cam transition area chill tissue: ledeburite, perlite, cementite, a small amount of flake graphite.Through engine pedestal and actual road test, the toughness and tenacity of the camshaft wear resistance that this kind chilled cast iron is made, anti scuffing power, block resistance, antistripping is very good, satisfies the requirement under high lotus of high speed and the stress alternation operating mode fully.And effectively controlled the chill degree of depth and hardness, and need not the follow-up treatment process of hardening, save man-hour, cost is low.
A kind of engine camshaft chilled cast iron of the present invention, further preferred mode is, described B step batching is: steel scrap 53%, the pig iron 10%, foundry returns 30.3%, carburelant 2.2% (Graphite Electrodes), element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy.Can also be in the d branch in the described C step: breed after 20 minutes the molten iron composition is carried out sampling Detection, the molten iron sampling, the copper mould casting sample piece with standard sample is detected as part with spectrum analyzer: then if composition is C 3.0%～3.4%; Si 2.0%～2.4%; Mn 0.6%～0.9%; P≤0.15%; S≤0.12%; Cu 0.2%～0.5%; Cr≤0.5%, surplus are that Fe and inevitable trace impurity are qualified; Defectively then adjust, on the low side as certain composition, adjust by the mode of the corresponding batching of suitable interpolation; If the molten iron that can't adjust then scrap.
A kind of engine camshaft chilled cast iron of the present invention, specific embodiment is
Embodiment 1: camshaft chilled cast iron Chemical Composition per-cent is C 3.0%～3.2%; Si 2.3%～2.4%; Mn 0.7%～0.9%; P 0.8%～0.12%; S 0.8%～0.10%; Cu 0.2%～0.3%; Cr 0.2%～0.3%, and surplus is Fe and inevitable trace impurity.The cam of camshaft Tao Jian district chill degree of depth that this chilled cast iron is made is controlled at 7-10mm, and Hardness Control is in 52-56HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 43-47HRC.
Embodiment 2: camshaft chilled cast iron Chemical Composition per-cent is C 3.0%～3.2%; Si 2.2%～2.3%; Mn 0.6%～0.8%; P 0.6%～0.10%; S 0.9%～0.12%; Cu 0.2%～0.3%; Cr 0.3%～0.4%, and surplus is Fe and inevitable trace impurity; The cam of camshaft Tao Jian district chill degree of depth that this chilled cast iron is made is controlled at 7-10mm, and Hardness Control is in 52-56HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 43-47HRC.
Embodiment 3: camshaft chilled cast iron Chemical Composition per-cent is C 3.2%～3.4%; Si 2.3%～2.4%; Mn 0.7%～0.9%; P 0.9%～0.12%; S 0.7%～0.9%; Cu 0.2%～0.3%; Cr 0.2%～0.3%, and surplus is Fe and inevitable trace impurity; The cam of camshaft Tao Jian district chill degree of depth that this chilled cast iron is made is controlled at 7-10mm, and Hardness Control is in 56-60HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 45-47HRC.
Embodiment 4: camshaft chilled cast iron Chemical Composition per-cent is C 3.2%～3.4%; Si 2.2%～2.3%; Mn 0.6%～0.8%; P 0.7%～0.10%; S 0.8%～0.12%; Cu 0.2%～0.3%; Cr 0.3%～0.4%, and surplus is Fe and inevitable trace impurity; The cam of camshaft Tao Jian district chill degree of depth that this chilled cast iron is made is controlled at 7-10mm, and Hardness Control is in 56-60HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 45-47HRC.
The manufacture method of a kind of above-mentioned engine camshaft chilled cast iron of the present invention may further comprise the steps:
A. moulding: place chill, filtering net, check, clear up sand mold, be about to contoured chill and be placed on cam cold shock district, contoured chill width and cam peach are wide, nose part chill thickness be cam peach external diameter 2.5-3.5 doubly, cam transition section chill thickness be cam peach external diameter 1.5-3 doubly; Thickness is in the smooth-going transition of different zones; Sand mold requires smooth, and mold cavity surface and joint face are level and smooth, and sand mold does not have disappearance;
B. prepare burden: steel scrap 50-55%, pig iron 8-12%, foundry returns 28-35%, carburelant 2.2% (Graphite Electrodes), element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy;
C. melting: use medium-frequency induction furnace, control voltage 660V, power≤600KW, water coolant electric conductivity≤50 μ S/cm comprises that following substep: a. adds carburelant, end alloy, the pig iron, foundry returns and steel scrap in order successively; B. melting molten iron; C. superheating and standing: the molten iron of fusing is heated to 1540 ℃, and outage is left standstill to 1480 ℃ then; D. breed: add the described alloy that breeds: iron 0.35%+ copper 0.15%+ ferrochrome 0.25%, the control molten iron temperature kept 30-35 minute at 1460-1500 ℃, wherein after breeding 20 minutes molten iron was carried out sampling Detection and adjusted according to assay; To be that the control molten iron temperature is at 1475 ℃, 1481 ℃, 1486 ℃, 1490 ℃, 1495 ℃ and 1499 ℃ in specific implementation process is converged, hold-time can be 30 minutes, 32 minutes, 33 minutes 45 seconds, 34 minutes and 35 minutes, can according to circumstances carry out the control of differing temps and time.
D: the molten iron that the C step obtains is poured into a mould, and teeming temperature is controlled at 1320 ℃-1379 ℃, the control duration of pouring≤22 second/mould; Teeming temperature generally can be about 1345 ℃, because similar so high temperature, the control precise temp is not easy especially, and therefore the temperature within this scope all can.
E: cooling is unpacked, and unpacks after cooling time, is controlled at cooling time 45-65 minute; General summer is because outside temperature is higher, thus the general time be controlled at 60-65 minute proper, and winter because outside temperature is lower, so speed of cooling is fast, be controlled within 45-50 minute and get final product general cooling time.
F: sand removal;
G: the axle part detects: comprise that step a. spectrum analyzer detects composition and step b. tensile test machine testing tensile strength.Through test, the cam of camshaft Tao Jian district chill degree of depth that the engine camshaft chilled cast iron that aforesaid method makes is made is controlled at 7-10mm, and Hardness Control is in 52-60HRC (in the peach wedge angle 40 degree scopes); The cam transition area chill degree of depth is controlled at 5-8mm, and Hardness Control is at 43-50HRC.Nose chill tissue: ledeburite, shred or granular pearlite, needle-like cementite, a small amount of point graphite; Cam transition area chill tissue: ledeburite, perlite, cementite, a small amount of flake graphite.Through engine pedestal and actual road test, the toughness and tenacity of the camshaft wear resistance that this kind method manufacturing chilled cast iron is made, anti scuffing power, block resistance, antistripping is very good, satisfies the requirement under high speed high-load and the stress alternation operating mode fully.And effectively controlled the chill degree of depth and hardness, and need not the follow-up treatment process of hardening, save man-hour, cost is low.
The manufacture method of a kind of above-mentioned engine camshaft chilled cast iron of the present invention, further optimized technical scheme is that described B step batching is: steel scrap 53%, the pig iron 10%, foundry returns 30.3%, carburelant 2.2% (Graphite Electrodes), element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy.The cam of camshaft Tao Jian district chill degree of depth that the engine camshaft chilled cast iron that makes is like this made is 9mm, and hardness is 58HRC (in the peach wedge angle 42 degree scopes); The cam transition area chill degree of depth is 8mm, and hardness is 49HRC.
Further preferred scheme is in the d branch in the described C step: breed after 20 minutes the molten iron composition is carried out sampling Detection, the molten iron sampling, copper mould casting sample piece with standard sample is detected as part with spectrum analyzer then: if composition is C 3.0%～3.4%; Si 2.0%～2.4%; Mn 0.6%～0.9%; P≤0.15%; S≤0.12%; Cu 0.2%～0.5%; Cr≤0.5%, surplus are that Fe and inevitable trace impurity are qualified; The defective adjustment; If the molten iron that can't adjust then scrap.Like this, can guarantee effectively that it realizes aforesaid goal of the invention.
Above-mentionedly only several specific embodiments among the present invention are illustrated; but can not be as protection scope of the present invention; every equivalence variation of having done according to the design spirit among the present invention or modification or equal proportion are amplified or are dwindled etc., all should think to fall into protection scope of the present invention.
Claims (3)
1. the manufacture method of an engine camshaft chilled cast iron is characterized in that: may further comprise the steps:
A. moulding: place chill, filtering net, check, clear up sand mold, be about to contoured chill and be placed on cam cold shock district, contoured chill width and cam peach are wide, nose part chill thickness be cam peach external diameter 2.5-3.5 doubly, cam transition section chill thickness be cam peach external diameter 1.5-3 doubly; Thickness is in the smooth-going transition of different zones; Sand mold requires smooth, and mold cavity surface and joint face are level and smooth, and sand mold does not have disappearance;
B. prepare burden: steel scrap 50-55%, pig iron 8-12%, foundry returns 28-35%, Graphite Electrodes 2.2%, element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy;
C. melting: use medium-frequency induction furnace, control voltage 660V, power≤600KW, water coolant electric conductivity≤50 μ S/cm comprises that following substep: a. adds Graphite Electrodes, end alloy, the pig iron, foundry returns and steel scrap in order successively; B. melting molten iron; C. superheating and standing: the molten iron of fusing is heated to 1540 ℃, and outage is left standstill to 1480 ℃ then; D. breed: add the described alloy that breeds: iron 0.35%+ copper 0.15%+ ferrochrome 0.25%, the control molten iron temperature kept 30-35 minute at 1460-1500 ℃, wherein after breeding 20 minutes molten iron was carried out sampling Detection and adjusted according to assay;
D: the molten iron that the C step obtains is poured into a mould, and teeming temperature is controlled at 1320 ℃-1379 ℃, the control duration of pouring≤22 second/mould;
E: cooling is unpacked, and unpacks after cooling time, is controlled at cooling time 45-65 minute;
F: sand removal;
G: the axle part detects: comprise step a: spectrum analyzer detects composition, and composition is C 3.0%～3.4%; Si 2.0%～2.4%; Mn 0.6%～0.9%; P≤0.15%; S≤0.12%; Cu 0.2%～0.5%; Cr≤0.5%, surplus are Fe and inevitable trace impurity; With step b: tensile test machine testing tensile strength.
2. the manufacture method of a kind of engine camshaft chilled cast iron according to claim 1, it is characterized in that: described B step batching is: steel scrap 53%, the pig iron 10%, foundry returns 30.3%, Graphite Electrodes 2.2%, element and iron alloy--copper 0.45%, ferrosilicon 3.2%, ferrochrome 0.85%, ferrosilicon 0.35%+ copper 0.15%+ ferrochrome 0.25% is for breeding alloy in described element and the iron alloy, and all the other iron alloys and element are end alloy.
3. the manufacture method of a kind of engine camshaft chilled cast iron according to claim 2, it is characterized in that: in the d branch in the described C step: breed after 20 minutes the molten iron composition is carried out sampling Detection, the molten iron sampling, copper mould casting sample piece with standard sample is detected as part with spectrum analyzer then: if composition is C 3.0%～3.4%; Si 2.0%～2.4%; Mn 0.6%～0.9%; P≤0.15%; S≤0.12%; Cu 0.2%～0.5%; Cr≤0.5%, surplus are that Fe and inevitable trace impurity are qualified; The defective adjustment; If the molten iron that can't adjust then scrap.
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| CN101121990A (en) * | 2007-09-20 | 2008-02-13 | 河南省中原内配股份有限公司 | Quasi-as-cast bainite gray cast iron cylinder jacket and preparation method thereof |
| CN101161845A (en) * | 2007-11-28 | 2008-04-16 | 中国船舶重工集团公司第十二研究所 | Synthetic cast iron for production of hydraulic piece and preparation method thereof |
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