CN100465318C - CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof - Google Patents
CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof Download PDFInfo
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- CN100465318C CN100465318C CNB2005100266862A CN200510026686A CN100465318C CN 100465318 C CN100465318 C CN 100465318C CN B2005100266862 A CNB2005100266862 A CN B2005100266862A CN 200510026686 A CN200510026686 A CN 200510026686A CN 100465318 C CN100465318 C CN 100465318C
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Abstract
The invention relates to a CrMoCu alloyed grain continuous casting section and its manufacturing process, and the section of this invention consists of C, Si, Mn, P, S, Cr, Mo, Cu, Ti and Fe; the proportion by weight (%) can be: C:3.20-3.60,Si:2.20-2.90,Mn:0.60-1.00,P:0.10-0.15,S: <=0.08,Cr:0.07-0.20,Mo:0.07-0.20,Cu:0.25-0.80,Ti:0.08-0.15, Fe:91-93; the significance effect of this invention is: one side, dissolving the CrMoCu element into basal body, the ground-mass electrode potential is improved, the galvanic amount in the base is reduced, the vivacious action of the alloy carbide formed by Cr and Mo is not changed and the acid and alkaline resistance is good, and corrosion resistance action can be reached. On the other side, the ideal martensitic plus diffuse secondary carbide structure is prepared by solution strengthening base action of CrMoCu element with micro special compound ( such as (Cr, Fe)3C and (Fe, Mo)3C) and simultaneously by heat treatment, and its hardness, intensity, roll degree and abradability are all clearly increased and the piston age and efficiency are also improved.
Description
Technical field
The present invention relates to a kind of cast alloy iron continuous casting section bar.
Background technology
On the basis of regular gray iron,, be widely used in fields such as household electrical appliances, automobile, electromechanics because of the needs of use properties have developed the cast alloy iron of outstanding many trades mark.
With conditioning unit used in everyday is example, at the vital part of air conditioner refrigerating compressor---and the corrosion that piston details will bear fluorine-containing refrigeration matchmaker on the one hand is in state of wear on the other hand again.How to make can accomplish that anti acid alkali performance is good, reach anticorrosive effect, the cast alloy iron continuous casting section bar of wear-resisting raising piston life and efficient is that pendulum needs the problem that solves in face of the science and technology personnel
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of CrMoCu cast alloy iron continuous casting section bar and manufacture method thereof, are intended to address the above problem.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
CrMoCu cast alloy iron continuous casting section bar of the present invention is made up of C, Si, Mn, P, S, Cr, Mo, Cu, Ti, Fe;
Its weight (%) is than being C, Si, Mn, P, S, Cr, Mo, Cu, Ti, Fe;
Difference military service requirement of strength according to making part can be divided into two composition ranges:
Its weight (%) is than being C:3.20-3.40, Si:2.20-2.40, and Mn:0.80-1.00, P:0.15, S :≤0.06, Cr:0.15-0.20, Mo:0.15-0.20, Cu:0.60-0.80, Ti:0.10-0.15, Fe:92.0～93.0;
Its weight (%) is than being C:3.30-3.60, Si:2.50-2.90, and Mn:0.60-1.00, P:0.15, S :≤0.08, Cr:0.07-0.14, Mo:0.07-0.12, Cu:0.26-0.50, Ti:0.08-0.12, Fe:91.0～93.0;
Silicon 2.20-2.4%;
The alloy hot metal smelting temperature is 1460～1500 degree Celsius;
The method that pours in the hot metal ladle breeds, and pregnant preceding molten iron temperature 1400～1420 degree Celsius breed 7～9 minutes time length, nucleating agent consumption 0.4～0.8%, nucleating agent granularity＜12mm;
(2), section bar spectroscopic analysis: determine Cr, Mo, Cu, Ti, Mn, S, P content;
(3), continuous casting drawing:
Mold structure;
The adjustment of temperature of cooling water, flow, pressure;
The adjustment of crystallizer outlet section bar surface temperature;
The adjustment of section bar pulling speed.
8. manufacture method according to claim 7, in the step (1): control carbon and silicone content weight (%) are in CE:3.8～4.3 scopes;
Breeding back molten iron CE value should be between 4.10～4.40;
In the step (2): determine Cr, Mo, Cu, Ti, Mn, S, P content, according to the requirement of component of machine use properties, intensity, hardness and the matrix situation of comprehensive section bar, adjust carbon equivalent, greying coefficient and alloying element C, Si, Mn, P, Cr, Mo, Cu, Ti, actual add-on;
In the step (3): the crystallizer pass is the carbon tube material, and its cooling water channel shape is divided spiral type and square type;
Water coolant is that normal pressure, water temperature are 30～60 degree Celsius, crystallizer outlet section bar surface temperature 750～950 degree Celsius,
Traction step-length mm:10～100.
| Composition | |
| Percentage composition (%) | 3.20 2.20 0.60 0.10 ≤0.08 0.07 0.07 0.25 0.08 91.00 ～ ～ ～ ～ ～ ～ ～ ～ ～ 3.60 2.90 1.00 0.15 0.20 0.20 0.80 0.15 93.00 |
Use properties according to CrMoCu cast alloy iron continuous casting material requires can be categorized as again:
High strength LZTHT350 (σ b ≈ 350N/mm
2, HB ≈ 220～260) the bar chemical constitution:
| C Si Mn P S Cr Mo Cu Ti |
| 3.20 2.20 0.80 0.15 ≤0.06 0.15 0.15 0.60 0.10 ～ ～ ～ ～ ～ ～ ～ 3.40 2.40 1.00 0.20 0.20 0.80 0.15 |
Intensity LZTHT250 (σ b ≈ 250N/mm
2, HB ≈ 180～240) the bar chemical constitution:
| C Si Mn P S Cr Mo Cu Ti |
| 3.30 2.50 0.60 0.15 ≤0.08 0.07 0.07 0.26 0.08 ～ ～ ～ ～ ～ ～ ～ 3.60 2.90 0.80 0.14 0.12 0.50 0.12 |
The chemical composition design principle of CrMoCu cast alloy iron continuous casting material:
Control carbon equivalent (CE) and greying coefficient (K) in the chemical ingredients and adjust the tissue and the performance of cast iron:
Main silicon (Si) is referred and synthesized into suitable carbon amount with phosphorus (P) in the cast iron, and it and actual carbon amount sum become carbon equivalent ce.
CE＝C+(Si+P)/3
C, Si, P respectively are the content (%) of carbon, silicon, phosphorus in the cast iron
The CE scope of CrMoCu cast alloy iron LZTHT250～350 controls is 4.15～4.40.
The influence of cast iron degree of graphitization mainly be the acting in conjunction of considering C and Si, and greying coefficient formula K=4/3Si (1-5/ (3C+Si)) is an effective tool of differentiating structure of cast iron.
When K≤0.65, cast iron is complete white tissue;
When 0.65＜K≤0.8, matrix is that perlite adds cementite fiber crops mouthful tissue;
When 0.85＜K≤2.05, matrix is that perlite adds ferrite ash mouthful tissue;
As K〉3.10 the time, matrix is a ferritic structure;
Under 0.85＜K≤2.05 situations, Cr, the Mo that adds, the content of Cu, to adjust pearlitic quantity of matrix and thickness degree, when alloy content increases, perlite quantity increases and refinement, improve the homogeneity of structure of casting section simultaneously, they are to adjust other responsive element of casting strength level.
The effect of titanium Ti content
At Ti content＜0.15% o'clock, promote greying, increase eutectic cell quantity, the refinement graphite crystallization.In the molten steel solidification process, impel austenite branch equiax crystal compact crystal simultaneously, obviously control casting graphite size and shrinkage cavity form.Ti also has the effect of playing purifying molten iron strongly in conjunction with oxygen, fixed nitrogen.In case Ti amount then can produce the minimizing greying 0.2% when above, loose converse phenomenon is solidified in increase.
Embodiment
Manufacture method of the present invention realizes by following steps:
Melting; Adopt induction furnace or cupola furnace---the melting mode of induction furnace: comprising:
Base iron, stokehold Rapid Thermal analyser control carbon and silicone content (weight percent) are in CE:3.8～4.3 scopes;
The alloy hot metal smelting temperature is 1460～1500 degree Celsius;
The method that pours in the hot metal ladle breeds, and pregnant preceding molten iron temperature 1400～1420 degree Celsius breed 7～9 minutes time length, nucleating agent granularity＜12mm, nucleating agent consumption 0.4～0.8%; Breeding back molten iron CE value should be between 4.10～4.40.
Section bar spectroscopic analysis: determine Cr, Mo, Cu, Ti, Mn, S, P content, according to the requirement of component of machine use properties, intensity, hardness and the matrix situation of comprehensive section bar, adjust carbon equivalent (CE), greying coefficient (K) and alloying element C, Si, Mn, P, Cr, Mo, Cu, Ti, actual add-on;
The continuous casting drawing:
The crystallizer pass is the carbon tube material, and its cooling water channel shape is divided spiral type and square type;
Water coolant is that normal pressure, water temperature are 30～60 degree Celsius, crystallizer outlet section bar surface temperature 750～950 degree Celsius,
Traction step-length mm:10～100.
Example
51m/m σ b210N/mm
2Bar---the control of drawing process parameter sees Table.
The control of drawing parameter:
Existing technology foundry goods interior in dense structure's property, the alloying constituent homogeneity, there is defective in aspects such as foundry goods shrinkage cavity, manufacturing of the present invention can substantially improve withstand voltage resistance to air loss and anti-attrition, the formation of control casting shrinking hole, and can in Production Flow Chart, the adopting process software programization reach the product performance uniformity, fine texture, the effect that output increases;
Work condition environment and working strength at compressor, the technological measure (solidifying condensate depression, setting rate etc.) that adopts control to solidify is reasonably adjusted collective and is organized thickness, organizes relative percentage composition, effectively and give full play to the effect of alloying, and reduce and the formation of the excellent shrinkage cavity of control casting.
Claims (8)
1. a CrMoCu cast alloy iron continuous casting section bar is made up of C, Si, Mn, P, S, Cr, Mo, Cu, Ti, Fe; Its weight (%) is than being: C:3.20-3.60, and Si:2.20-2.90, Mn:0.60-1.00, P:0.10-0.15, S :≤0.08, Cr:0.07-0.20, Mo:0.07-0.20, Cu:0.25-0.80, Ti:0.08-0.15, Fe:91-93.
2. CrMoCu cast alloy iron continuous casting section bar according to claim 1, its weight (%) is than being C:3.20-3.40, Si:2.20-2.40, Mn:0.80-1.00, P:0.15, S :≤0.06, Cr:0.15-0.20, Mo:0.15-0.20, Cu:0.60-0.80, Ti:0.10-0.15, Fe:92.0-93.0.
3. CrMoCu cast alloy iron continuous casting section bar according to claim 1, its weight (%) is than being C:3.30-3.60, Si:2.50-2.90, Mn:0.60-1.00, P:0.15, S :≤0.08, Cr:0.07-0.14, Mo:0.07-0.12, Cu:0.26-0.50, Ti:0.08-0.12, Fe:91.0-93.0.
4. CrMoCu cast alloy iron continuous casting section bar according to claim 1, its weight (%) be than being C:3.50, Si:2.80, Mn:0.60, P:0.10, S:0.06, Cr:0.08, Mo:0.08, Cu:0.50, Ti:0.12, Fe:92.16.
5. CrMoCu cast alloy iron continuous casting section bar according to claim 1, its weight (%) be than being C:3.40, Si:2.40, Mn:0.80, P:0.10, S:0.06, Cr:0.12, Mo:0.12, Cu:0.60, Ti:0.12, Fe:92.28.
6. CrMoCu cast alloy iron continuous casting section bar according to claim 1, its weight (%) be than being C:3.20, Si:2.20, Mn:1.00, P:0.10, S:0.06, Cr:0.20, Mo:0.20, Cu:0.70, Ti:0.15, Fe:92.19.
7. the manufacture method of a CrMoCu cast alloy iron continuous casting section bar as claimed in claim 1, realize by following steps:
(1), melting; Adopt induction furnace or cupola furnace---the melting mode of induction furnace: melting technology comprises:
Base iron, stokehold Rapid Thermal analyser controlled contents (weight percent): carbon 3.20-3.40% and manufacture method of the present invention realize by following steps:
Melting; Adopt induction furnace or cupola furnace---the melting mode of induction furnace: melting technology comprises:
Base iron, stokehold Rapid Thermal analyser controlled contents (weight percent): carbon 3.20-3.40% and silicon 2.20-2.40%;
The alloy hot metal smelting temperature is 1460～1500 degree Celsius;
The method that pours in the hot metal ladle breeds, and pregnant preceding molten iron temperature 1400～1420 degree Celsius breed 7～9 minutes time length, nucleating agent consumption 0.4～0.8%, nucleating agent granularity＜12mm;
Section bar spectroscopic analysis: determine Cr, Mo, Cu, Ti, Mn, S, P content;
The continuous casting drawing:
Mold structure;
The adjustment of temperature of cooling water, flow, pressure;
The adjustment of crystallizer outlet section bar surface temperature;
The adjustment of section bar pulling speed;
Compared with prior art, the invention has the beneficial effects as follows: utilize the CrMoCu element to dissolve in matrix on the one hand, improve the electropotential of metallic matrix, reduce the galvanic cell quantity in the matrix, it is constant that Cr and Mo form the active effect of alloy carbide, and anti acid alkali performance is good, reaches anticorrosive effect; On the other hand, the CrMoCu element is simultaneously respectively with the effect of solution strengthening matrix and the special compound (example (Cr, Fe) of trace
3C, (Fe, Mo)
3C), just obtain the proeutectoid carbide tissue that ideal martensite adds disperse again by thermal treatment, its hardness, intensity, winding degree and wear resistance all obviously improve, and have improved piston life and efficient.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail:
The chemical ingredients of CrMoCu cast alloy iron continuous casting material
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| CNB2005100266862A CN100465318C (en) | 2005-06-10 | 2005-06-10 | CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof |
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| CNB2005100266862A CN100465318C (en) | 2005-06-10 | 2005-06-10 | CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof |
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| CN100465318C true CN100465318C (en) | 2009-03-04 |
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| KR101409877B1 (en) * | 2011-11-14 | 2014-06-20 | 엘지전자 주식회사 | Alloy cast iron and manufacturing method of vane using the same |
| CN102744373B (en) * | 2012-07-05 | 2016-03-02 | 繁昌县金科铸造有限责任公司 | The casting technique of piston shell |
| CN103194665B (en) * | 2013-04-16 | 2015-08-05 | 沈阳华铸科技有限公司 | Eutectic graphite grey cast iron continous-cast section material and manufacture method thereof |
| CN104651708A (en) * | 2014-06-21 | 2015-05-27 | 柳州凯通机械有限公司 | Cast iron alloy for piston ring |
| CN107127534A (en) * | 2017-03-17 | 2017-09-05 | 海安县恒益滑动轴承有限公司 | A kind of production technology and system of high ferro train motor frictional disk embryo material |
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| CN1041895A (en) * | 1988-10-19 | 1990-05-09 | 山东工业大学 | The mold material of cast steel and iron |
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