CN1132259A - High Cr cast iron - Google Patents

High Cr cast iron Download PDF

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Publication number
CN1132259A
CN1132259A CN 95103147 CN95103147A CN1132259A CN 1132259 A CN1132259 A CN 1132259A CN 95103147 CN95103147 CN 95103147 CN 95103147 A CN95103147 A CN 95103147A CN 1132259 A CN1132259 A CN 1132259A
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CN
China
Prior art keywords
cast iron
less
chromium
content
carbide
Prior art date
Application number
CN 95103147
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Chinese (zh)
Inventor
王宇辉
Original Assignee
王宇辉
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 王宇辉 filed Critical 王宇辉
Priority to CN 95103147 priority Critical patent/CN1132259A/en
Publication of CN1132259A publication Critical patent/CN1132259A/en

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Abstract

A high-carbon, high-chromium, antiwear and anticorrosion cast iron used to manufacture workpiece of slag slurry pump, delivery pipeline, elbow, rolling teeth of coal crusher, and swirler of coal mill to obtain long service life is characterized by that to cast iron such components as C (3.8-2.8), Si (less than 1.0), Mn (less than 0.8), P (less than 0.07), S (less than 0.05), Cr (22-12), Mo (0.7-1.3), V (0.25-0.35), Cu (less than 1.0) and Re (0.03-0.05) are added.

Description

A kind of rich chromium cast iron
The present invention relates to a kind of high carbon and chromium wear-and corrosion-resistant foundry goods that is widely used in the anti-consumable accessorys of industrial circle such as metallurgy, mine, electric power, chemical industry, coal.
Slag stock pump flow passage part (impeller, sheath, forward and backward plate) generally adopts s-generation high-abrasive material Ni-hard or general high-chromium white cast iron at present, under different working conditions, differs bigger work-ing life, is roughly between 150-3500 hour.There is subject matter:
Ni-hard cast iron, because of carbide is the M3C type, be net distribution in crystal boundary, so this material fragility is big, and hardness is not high yet, erosion resistant not, Ni is valuable rare element in addition.
General rich chromium cast iron, though it is non-netted that carbide is, the lath-shaped M7C3 type that distributes, its ak value is than Ni-Hard height, but in producing, for avoiding foundry goods to crack, have to usually [C] is controlled at≤2.8%, so that carbide comparatively small amt in the matrix (be 23%<weight percentage 〉) causes the slag stock pump to cross fluid is still wear-resisting inadequately.
Purpose of the present invention is exactly to add the composite alloy element of some amount on the basis of conventional rich chromium cast iron, to form mutual compound action, improves comprehensive mechanical performance; And the raising carbon content under low-stress erosion abrasive wear working condition, improves the work-ing life (>6000 hours) of slag stock pump flow passage part
The high network erosion resistant of high-carbon cast iron, its Chemical Composition and the content (weight percent) of institute of the present invention art are as follows:
C?3.8/2.8、Si?≤1.0、Mn?≤0.8、P?≤0.07、S?≤0.05、Cr22/12、Mo?0.7/1.3、V?0.25/0.35、Cu?≤1.0、Re?0.03/0.05、
All the other are Fe.
Wherein:
(1) carbon: content is to influence one of ferrous materials performance most critical, topmost element.The present invention confirms: increasing carbon content, is to improve material hardness, increases most economical, the most effective, the easiest method of wear resisting property.But carbon content increases, and crack sensitivity increases, and for this reason, should take corresponding technical measures on technology.
The present invention is controlled at 2.8-3.8%C with carbon content, and each operation of foundry goods does not ftracture, and product hardness HRC can be greater than 60 °.Flow passage part work-ing life>6000 hour.
(2) chromium: chromium is high carbon and chromium erosion resistant cast iron main alloy element of the present invention, when containing Cr>12%, and suitably controls the Cr/C ratio, can guarantee that the carbide lattice types is by M 3The C type changes M into 7C 3Type, M 7C 3The distribution of type carbide in ledeburite also changes discontinuous netted lath-shaped form into by continuous net-shaped and ledeburite form, and the latter is embedded among the martensitic matrix securely, thus material toughness height not only, and the hardness height, wear resistance is good.
Chromium content is low excessively, and (<12%), Cr/C are low excessively, can not guarantee to obtain M 7C 3The type carbide also influences hardening capacity and material etch resistant properties, and reduces the material comprehensive mechanical performance.The present invention determines, under low-stress erosive wear condition, the Cr/C ratio is controlled at 4.0-6.0, chrome content is controlled at 12-22%.
(3) vanadium: V forms VC or V 4C 3Extremely strong strong element, it is upright block to be arc, the hardness height, do not break, indeformable, the brilliant material of refinement simultaneously improves wear resistance.Add a certain amount of vanadium, help martensitic transformation.But find in the test that excessive vanadium, foundry goods easily generate very thick oxide skin in heat treatment process, totally unfavorable.So vanadiumcontent of the present invention is controlled at 0.25-0.35%.
(4) molybdenum: Mo generates infusibility, tiny, dispersive carbide Mo in this material 2C helps to be comprised in M 7C 3In the type double carbide, the function of strongly inhibited perlitic transformation and raising hardening capacity is arranged.According to the foundry goods thickness, suitably add the molybdenum amount.Molybdenum content of the present invention is controlled at 0.7-1.3%, has both guaranteed to bring into play the function of molybdenum, and may command hot tearing susceptibility increases again.
(5) copper: the present invention adds the copper of 0.8-1.0%, and purpose is to increase hardening capacity, avoids occurring in the as-cast structure excessive perlite.Unite adding because of molybdenum and copper again, cause interaction,, can further change carbide morphology and distribution again, and obtain acicular structure when promoting air quenching improving hardening capacity simultaneously.But copper should not be added, because of its stable austenite, so it is controlled in the 0.8-1.0% scope.
(6) manganese: designing a certain amount of manganese, is in order to improve hardening capacity, but the remarkable stable austenite of Mn reduces the Ms point, and remained austenite content increases, so it is designed to 0.4-0.8%.
(7) silicon: adding a certain amount of silicon in the design, is to be deoxidation, and general Si amount is controlled at below 0.8%, otherwise influences hardening capacity and notched bar impact strength.
(8) rare earth (Re): this composition does not have a certain amount of rare earth ferrosilicon of adding in the meter, main purpose is with the processing of going bad of high carbon and chromium erosion resistant cast iron iron liquid to the slag stock pump, distribution with the form that changes carbide, make grain refining, purify crystal boundary, improving notched bar impact strength, is technical measures of taking after carbon content improves, to improve the comprehensive mechanical performance of material.Add-on is too much, will run counter to desire, and has the opposite effect, so the 0.20-0.25% that rare earth silicon add-on of the present invention is a molten metal weight, it is good that actual Re content should be controlled at 0.03-0.05%.
(9) phosphorus, sulphur: under starting material enabled condition, P, S content should be low more good more.The design requires P≤0.008%, S≤0.005%.
Rich chromium cast iron of the present invention is fit to be applied to the equipment work-piece of low-stress erosion abrasive wear working condition, under identical operating mode and condition, compare the life-span with application of nickel hard cast iron workpiece and improved 1.2 times-2.33 times, compare with general rich chromium cast iron material, also improved 1.03 times-1.47 times its work-ing life.
Embodiment 1
Chemical Composition and add-on are pressed in routine proportioning (weight percent) the adding molten iron during smelting:
C 3.16
Si 1.0
Cr 20.50
Mn 0.57
Mo 1.27
V 0.28
Cu 0.8
Re 0.035
P 0.024
S 0.045
Do rotten the processing with Re-Si (No. 1, packet header), add-on is 0.2% of a molten metal weight.
Carry out Argon (Ar) processing then in cast iron liquid, pressure is 0.03MPa, and the time is 2-3 minute.Under 1370-1390 ℃ of temperature, carry out the casting of slag stock pump flow passage part with this cast iron,
The back mechanical property is as follows after tested:
HRc=62
ak=0.4kgf/cm 2
The gained metallographic structure is after Overheating Treatment:
Martensite+small portion of residual austenite+brilliant carbide rues
Compare under identical working condition than ni-hard cast iron pulp pump flow passage part work-ing life and improved 2 times, compare under identical working condition than the slag stock pump flow passage part of general rich chromium cast iron material and improve 1.2 times.
Embodiment 2
Smelt with the smelting process identical with embodiment 1, Chemical Composition and add-on are pressed routine proportioning (weight percent) and are added in the molten iron:
C 3.8
Si 0.9
Cr 22
Mn 0.8
Mo 1.3
V 0.35
Cu 1.0
Re 0.05
P 0.07
S 0.05
With this cast iron casting coal pulverizer gear hobbing, 2 times have been improved friction durability.
Mechanical property is as follows after testing:
HRC=60
ak=4J/cm 2
Embodiment 3
With smelt with the same method of embodiment 1,2, Chemical Composition and add-on be as follows: (weight percent)
C 2.8
Si 0.8
Cr 12
Mn 0.7
Mo 0.9
V 0.25
Cu 0.8
Re 0.03
P 0.06
S 0.03
With this cast iron casting coal pulverizer swirler, friction durability having improved 2.1 times.
Mechanical property is as follows after testing:
HRC=60
ak=4J/cm 2

Claims (2)

1. rich chromium cast iron is characterized in that its material Chemical Composition and content following (weight percent):
C?3.8/2.8、Si?≤1.0、Mn?≤0.8、P?≤0.07、S?≤0.05?Cr、22/12、Mo?0.7/1.3、V?0.25/0.35、Cu?≤1.0、Re?0.03/0.05、
All the other are Fe.
2. the smelting process of a rich chromium cast iron is characterized in that:
(1) with Re-Si to the processing of going bad of liquid stream,
(2) handle carrying out Argon (Ar) in the iron liquid, pressure=0.03MPa time is 2-3 minute.
CN 95103147 1995-03-28 1995-03-28 High Cr cast iron CN1132259A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 95103147 CN1132259A (en) 1995-03-28 1995-03-28 High Cr cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 95103147 CN1132259A (en) 1995-03-28 1995-03-28 High Cr cast iron

Publications (1)

Publication Number Publication Date
CN1132259A true CN1132259A (en) 1996-10-02

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Application Number Title Priority Date Filing Date
CN 95103147 CN1132259A (en) 1995-03-28 1995-03-28 High Cr cast iron

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CN (1) CN1132259A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100423862C (en) * 2006-12-12 2008-10-08 袁厚之 Steel pipe-straightening roller for casting high chromium iron or high chrome steel
CN100453674C (en) * 2005-11-10 2009-01-21 西安交通大学 Low cost, high-wearability hypereutectic high chromium cast iron and its production method
CN100497703C (en) * 2007-02-15 2009-06-10 济南金品磁业有限公司 Rare earth multicomponent micro-alloying high-chromium cast iron and uses thereof
CN102146546A (en) * 2010-02-09 2011-08-10 徐州胜海机械制造科技有限公司 High-fluidity and high-abrasion resistant alloy material for solid material conveying pipe
CN102839256A (en) * 2012-09-19 2012-12-26 北京工业大学 Smelting method for obtaining high-quality metal liquid
CN103290303A (en) * 2012-03-01 2013-09-11 随州市神业精艺铸造有限公司 Method for preparing high-strength wear-resistant material for concrete pump truck elbow
CN103409681A (en) * 2013-08-21 2013-11-27 中联重科股份有限公司 High-chromium cast iron, thin-walled tube prepared from same, and preparation method of thin-walled tube
CN103658601A (en) * 2013-11-21 2014-03-26 本溪市铸兴泵业有限公司 Water pump overflowing piece manufacturing combination and method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100453674C (en) * 2005-11-10 2009-01-21 西安交通大学 Low cost, high-wearability hypereutectic high chromium cast iron and its production method
CN100423862C (en) * 2006-12-12 2008-10-08 袁厚之 Steel pipe-straightening roller for casting high chromium iron or high chrome steel
CN100497703C (en) * 2007-02-15 2009-06-10 济南金品磁业有限公司 Rare earth multicomponent micro-alloying high-chromium cast iron and uses thereof
CN102146546A (en) * 2010-02-09 2011-08-10 徐州胜海机械制造科技有限公司 High-fluidity and high-abrasion resistant alloy material for solid material conveying pipe
CN102146546B (en) * 2010-02-09 2015-12-02 徐州胜海机械制造科技有限公司 A kind of high workability high-wearing feature alloy material for solid material conveying pipe
CN103290303A (en) * 2012-03-01 2013-09-11 随州市神业精艺铸造有限公司 Method for preparing high-strength wear-resistant material for concrete pump truck elbow
CN102839256A (en) * 2012-09-19 2012-12-26 北京工业大学 Smelting method for obtaining high-quality metal liquid
CN103409681A (en) * 2013-08-21 2013-11-27 中联重科股份有限公司 High-chromium cast iron, thin-walled tube prepared from same, and preparation method of thin-walled tube
CN103409681B (en) * 2013-08-21 2015-06-03 中联重科股份有限公司 High-chromium cast iron, thin-walled tube prepared from same, and preparation method of thin-walled tube
CN103658601A (en) * 2013-11-21 2014-03-26 本溪市铸兴泵业有限公司 Water pump overflowing piece manufacturing combination and method
CN103658601B (en) * 2013-11-21 2016-08-17 本溪市铸兴泵业有限公司 The method making the compositions of water pump flow passage part

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