CN103966523A - Quench-polish-quench (QPQ) treatment method for super duplex stainless cast steel - Google Patents

Quench-polish-quench (QPQ) treatment method for super duplex stainless cast steel Download PDF

Info

Publication number
CN103966523A
CN103966523A CN201410196795.8A CN201410196795A CN103966523A CN 103966523 A CN103966523 A CN 103966523A CN 201410196795 A CN201410196795 A CN 201410196795A CN 103966523 A CN103966523 A CN 103966523A
Authority
CN
China
Prior art keywords
qpq
cast steel
treatment
duplex stainless
stainless cast
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CN201410196795.8A
Other languages
Chinese (zh)
Other versions
CN103966523B (en
Inventor
刘�东
向红亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuzhou University
Original Assignee
Fuzhou University
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 Fuzhou University filed Critical Fuzhou University
Priority to CN201410196795.8A priority Critical patent/CN103966523B/en
Publication of CN103966523A publication Critical patent/CN103966523A/en
Application granted granted Critical
Publication of CN103966523B publication Critical patent/CN103966523B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention provides super duplex stainless cast steel, and a quench-polish-quench (QPQ) treatment method for the super duplex stainless cast steel. The super duplex stainless cast steel comprises the following components by weight percent: not more than 0.03% of C, not more than 1.0% of Si, not more than 1.0% of Mn, 5.0-7.0% of Ni, 28.5-30.5% of Cr, 1.7-2.5% of Mo, less than 0.03% of S and P, 0.2-0.4% of N and the balance being iron. The super duplex stainless cast steel is firstly subjected to solution treatment and then subjected to QPQ treatment. The QPQ treatment is mainly divided into two parts, wherein in the first part, nitriding treatment is carried out, and a cyanate base salt is adopted; in the second part, oxidation treatment is carried out. According to the super duplex stainless cast steel subjected to QPQ treatment, the abrasive resistance can be significantly improved under the condition of ensuring the conventional mechanical properties and corrosion resisting property, the service life of the super duplex stainless cast steel or the spare part is prolonged, and the QPQ treatment method has significant economic benefits.

Description

A kind of superfine two-phase stainless cast steel QPQ treatment process
Technical field
The invention belongs to duplex stainless steel cast steel material technical field, be specifically related to a kind of superfine two-phase stainless cast steel and QPQ treatment process thereof.
Background technology
Duplex stainless steel refers to the stainless steel grade that microstructure is comprised of ferrite (α) and austenite (γ), its performance has the feature of ferritic stainless steel and austenitic stainless steel concurrently, thereby be widely used in the environment of many harshnesses, as industries such as ocean, oil, chemical industry, boats and ships.Duplex stainless steel spot corrosion drag equivalent value PREN (pitting resistance equivalent number) >=42 o'clock, belongs to special super-duplex stainless steel.Compare with third generation duplex stainless steel, it has higher intensity and corrosion resisting property, is a kind of ideal material for deep water or seawater, and it is when the temperature range of 500 ~ 650 ℃, does not generally have intermetallic phase to separate out.But it is still the same with other duplex stainless steels there is the deficiency that hardness is lower, wear no resistance.In burn into wearing and tearing and heavy duty, wait under the simultaneous condition of many factors especially, can obviously shorten work-ing life.Therefore, the wear resistance that improves it just seems particularly important, in the work-ing life that this not only can elongated component, improves resource utilization, also has good social value and economic benefit.
QPQ (Quench-Polish-Quench) is a kind of metallic surface heat treatment technics, and it is QPQ salt bath composite treatment technology for domestic general title.It is to ooze at the TF1 of novel non-pollution salt bath a kind of novel salt bath composite treatment technology of again improveing on N method basis, to ooze the material of N through salt bath, carries out carrying out the technology of oxide treatment after surface finish again.The core of QPQ technology can be described as a kind of low temperature and oozes N technology, and as a kind of comprehensive metal surface enhanced means, its essence is ooze N and oxidation operation compound simultaneously, and the diffusion layer organization of acquisition is equally also the compound of nitride and oxide compound.Material, after oozing N and oxide treatment, can form the high and fine and close infiltration layer of hardness at material surface, and this can significantly improve the wear resistance of material, thereby has improved the over-all properties of material.The salt bath formula of this utilization green simultaneously, can to environment produce pollute and energy consumption not little, material has outward appearance U.S., is out of shape the advantages such as little, performance is good after this technical finesse in addition.Based on this, this technology has been widely used in the industries such as automobile, mould, cutter, petroleum machinery, engineering tool since exploitation.Along with the raising of people's environmental consciousness and the proposition of " building a conservation-minded society " target, energy-saving and environmental protection, efficient QPQ technology have caused investigation of materials person's extensive concern.
At present, in industrial production, existing enterprise adopts QPQ technology to be used for improving stainless wear resistance, and for example Cummins Corp adopts QPQ technical finesse Engine Valve Materials 5Cr21Mn9Ni4N (austenitic stainless steel) to increase the wear resistance under its condition of high temperature; Germany stretch yarn machine manufacturers equally also adopts QPQ technology to process hot rail material 0Cr18N12Mo2Ti (austenitic stainless steel), to improve its high temperature abrasion resistance.But current, the application report of QPQ technology aspect stainless steel be mainly for single-phase stainless steels such as austenite, martensites, its applied research on superfine duplex stainless steel, and document rarely has report.Therefore, at superfine duplex stainless steel, carry out QPQ and process its wear resistance of raising, in the work-ing life that this not only can extend material, reduce costs, also will further expand the range of application of QPQ technology.
Summary of the invention
The object of the present invention is to provide a kind of superfine duplex stainless steel and surperficial QPQ treatment process thereof, this superfine two-phase stainless steel is after QPQ processes, matrix can not separated out harmful phase and be kept good mechanical property and solidity to corrosion, can also increase substantially its wear resistance, strengthen the work-ing life under its particular surroundings, there is significant economic and social benefit.
For achieving the above object, the present invention adopts following technical scheme:
A kind of elementary composition and mass percent of superfine two-phase stainless cast steel is: C≤0.03%, Si≤1.0%, Mn≤1.0%, Ni:5.0% ~ 7.0%, Cr:28.5% ~ 30.5%, Mo:1.7% ~ 2.5%, S, P:<0.03%, N:0.2% ~ 0.4%, remainder is iron.
Preparation method comprises the following steps:
(1) raw material pre-treatment: all raw materials enter stokehold all will carry out oil removing, rust cleaning, degassing processing;
Described raw material and massfraction thereof are: 316L stainless steel ingot or scrap stock 40%-50%, be greater than 60% molybdenum-iron 1.0%-1.3%, chrome content be greater than 99% chromium metal 18%-22%, copper content and be greater than the chromium nitride 3.0%-5.0% that 99% electrolytic copper 2%-3%, nitrogen content are greater than 9% containing molybdenum amount, all the other are technically pure iron; The massfraction sum of described raw material is 100%;
(2) melting in conventional induction furnace: first add 316L stainless steel ingot or scrap stock to melt, then add successively technically pure iron, molybdenum-iron, chromium metal and electrolytic copper; When temperature reaches 1600-1610 ℃, add the silico-calcium manganese of total mass 0.2% to carry out deoxidation, then add chromium nitride, then add the silico-calcium manganese of total mass 0.2% to carry out deoxidation, then removal of impurities thermometric cast, teeming temperature is no more than 1620 ℃; After pouring cast part air cooling through 1050 ℃ of solution treatment 2h, shrend.
The QPQ treatment process of described superfine two-phase stainless cast steel comprises the following steps:
(1) by solid solution 400 ℃ of preheatings 0.5 hour in acetone, the cleaned rear stove of alcohol for material;
(2) then material being oozed to N in the cyanate radical type base salt in oozing N stove processes: cyanate radical type base salt is Zassol or potassium cyanate, sodium carbonate or salt of wormwood and sodium-chlor or Repone K, and wherein the mass content of cyanate radical is 33% ~ 39%, [Na +]/[K +]=1:1 ~ 1:1.5, temperature is 550-590 ℃, the time is 90min-150min;
(3) ooze material to be placed in after N and in oxidized still, carry out oxide treatment: saline oxide is the mixture of SODIUMNITRATE and saltpetre, and both mass ratioes are 1:1 ~ 1:2, and oxidizing temperature is 400 ℃, and the time is lower than 30min;
(4) well-oxygenated material is carried out to polished finish.
Remarkable advantage of the present invention is: the superfine two-phase stainless steel that the present invention makes is after QPQ processes, matrix can not separated out harmful phase and be kept good mechanical property and solidity to corrosion, can also increase substantially its wear resistance, strengthen the work-ing life under its particular surroundings, there is significant economic and social benefit.
Accompanying drawing explanation
Fig. 1 is the metallograph after the QPQ of embodiment 1 art breading.
Fig. 2 is the metallograph after the QPQ of embodiment 2 art breading.
Fig. 3 is the metallograph after the QPQ of embodiment 3 art breading.
Fig. 4 is the metallograph after the QPQ of embodiment 4 art breading.
Fig. 5 is the metallograph after the QPQ of embodiment 5 art breading.
Embodiment
With embodiment, the present invention is described in more detail below, these embodiment are only the descriptions to best mode for carrying out the invention, scope of the present invention are not had to any restriction.
Embodiment: adopt induction furnace melting molten steel, be cast in investment shell, coolingly become diameter by clearing up and processing φthe coupon of 22mm * 220mm.
The chemical composition of the superfine duplex stainless steel of the present invention is as shown in table 1.Solid solution treatment process: be incubated shrend after 2h at 1050 ℃.QPQ treatment process is in Table 2.(embodiment carries out the superfine two-phase stainless cast steel of QPQ processing again after solution treatment, contrast material is the material after solution treatment only, is called mother metal).Performance comparison adopts microhardness tester to measure in Table 3(hardness; 1h abrasion loss adopts encircle-piece formula wear testing machine to measure; Corrosion electric current density adopts Ta Feier extrapotation to measure; Tensile strength is by standard GBT228-2002(metallic substance tensile test at room temperature method) measure).Fig. 1-5th, the metallograph after the QPQ of embodiment 1-5 art breading.
Table 1 material chemical composition and solid solution treatment process
According to PREN=Cr%+3.3 * Mo%+30 * N% formula, calculating its value is 43.9, belongs to superfine duplex stainless steel.
Table 2 QPQ treatment process contrast table
Table 3 performance comparison table
From Fig. 1-5, the sample after QPQ processes has certain alloying layer thickness, and on matrix, does not all have intermetallic phase to separate out, and can therefore not cause mechanical property and corrosion proof deterioration.As shown in Table 3, compare with mother metal, though they have very strong wear resistance, mechanical property and corrosion resisting property are suitable with it.Therefore, mother metal can be for strong erosion corrosion operating mode after QPQ processes.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.

Claims (3)

1. a superfine two-phase stainless cast steel, it is characterized in that: elementary composition and mass percent is: C≤0.03%, Si≤1.0%, Mn≤1.0%, Ni:5.0% ~ 7.0%, Cr:28.5% ~ 30.5%, Mo:1.7% ~ 2.5%, S, P:<0.03%, N:0.2% ~ 0.4%, remainder is iron.
2. a method of preparing superfine two-phase stainless cast steel as claimed in claim 1, is characterized in that: comprise the following steps:
(1) raw material pre-treatment: all raw materials enter stokehold all will carry out oil removing, rust cleaning, degassing processing;
Described raw material and massfraction thereof are: 316L stainless steel ingot or scrap stock 40%-50%, be greater than 60% molybdenum-iron 1.0%-1.3%, chrome content be greater than 99% chromium metal 18%-22%, copper content and be greater than the chromium nitride 3.0%-5.0% that 99% electrolytic copper 2%-3%, nitrogen content are greater than 9% containing molybdenum amount, all the other are technically pure iron; The massfraction sum of described raw material is 100%;
(2) melting in conventional induction furnace: first add 316L stainless steel ingot or scrap stock to melt, then add successively technically pure iron, molybdenum-iron, chromium metal and electrolytic copper; When temperature reaches 1600-1610 ℃, add the silico-calcium manganese of total mass 0.2% to carry out deoxidation, then add chromium nitride, then add the silico-calcium manganese of total mass 0.2% to carry out deoxidation, then removal of impurities thermometric cast, teeming temperature is no more than 1620 ℃; After pouring cast part air cooling through 1050 ℃ of solution treatment 2h, shrend.
3. a QPQ treatment process for superfine two-phase stainless cast steel as claimed in claim 1, is characterized in that: comprise the following steps:
(1) by solid solution 400 ℃ of preheatings 0.5 hour in acetone, the cleaned rear stove of alcohol for material;
(2) then material being oozed to N in the cyanate radical type base salt in oozing N stove processes: cyanate radical type base salt is Zassol or potassium cyanate, sodium carbonate or salt of wormwood and sodium-chlor or Repone K, and wherein the mass content of cyanate radical is 33% ~ 39%, [Na +]/[K +]=1:1 ~ 1:1.5, temperature is 550-590 ℃, the time is 90min-150min;
(3) ooze material to be placed in after N and in oxidized still, carry out oxide treatment: saline oxide is the mixture of SODIUMNITRATE and saltpetre, and both mass ratioes are 1:1 ~ 1:2, and oxidizing temperature is 400 ℃, and the time is lower than 30min;
(4) well-oxygenated material is carried out to polished finish.
CN201410196795.8A 2014-05-12 2014-05-12 A kind of superfine two-phase stainless cast steel QPQ treatment process Active CN103966523B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410196795.8A CN103966523B (en) 2014-05-12 2014-05-12 A kind of superfine two-phase stainless cast steel QPQ treatment process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410196795.8A CN103966523B (en) 2014-05-12 2014-05-12 A kind of superfine two-phase stainless cast steel QPQ treatment process

Publications (2)

Publication Number Publication Date
CN103966523A true CN103966523A (en) 2014-08-06
CN103966523B CN103966523B (en) 2016-02-03

Family

ID=51236518

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410196795.8A Active CN103966523B (en) 2014-05-12 2014-05-12 A kind of superfine two-phase stainless cast steel QPQ treatment process

Country Status (1)

Country Link
CN (1) CN103966523B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105297125A (en) * 2015-12-02 2016-02-03 成都锦汇科技有限公司 QPQ treatment process applicable to piston ring
CN106399921A (en) * 2016-09-19 2017-02-15 福州大学 QPQ technology for increasing thickness of infiltrated layer on surface of cast duplex stainless steel
CN107675099A (en) * 2017-08-23 2018-02-09 宁波市鄞州亚大汽车管件有限公司 Bent-tube boiler muffler
CN107904552A (en) * 2017-11-22 2018-04-13 昆山三民涂赖电子材料技术有限公司 A kind of saline oxide and its technique for the processing of steel material nitriding with post-oxidizsing
CN108531853A (en) * 2018-06-01 2018-09-14 南京联塑科技实业有限公司 A kind of QPQ salt bath processing methods suitable for die surface processing
CN109161840A (en) * 2018-09-10 2019-01-08 义马丰达设备有限责任公司 Prevent the two opposite methods and its valve member for moving back and forth the occlusion of stainless steel valve member
CN112210721A (en) * 2020-09-30 2021-01-12 福州大学 Antibacterial super-grade duplex stainless steel and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6431953A (en) * 1987-07-28 1989-02-02 Nidatsuku Kk Two-phase cast stainless steel combining high yield strength with high corrosion resistance and heat treatment therefor
CN1125965A (en) * 1993-06-21 1996-07-03 桑德维克公司 Ferritic-austenitic stainless steel and use of the steel
CN1154419A (en) * 1996-10-14 1997-07-16 冶金工业部钢铁研究总院 ultra hypoeutectoid, diphasic stainless steel, and prodn. method thereof
CN101956143A (en) * 2010-11-25 2011-01-26 福州大学 Silver-contained antibacterial super duplex-phase stainless steel and fabrication method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6431953A (en) * 1987-07-28 1989-02-02 Nidatsuku Kk Two-phase cast stainless steel combining high yield strength with high corrosion resistance and heat treatment therefor
CN1125965A (en) * 1993-06-21 1996-07-03 桑德维克公司 Ferritic-austenitic stainless steel and use of the steel
CN1154419A (en) * 1996-10-14 1997-07-16 冶金工业部钢铁研究总院 ultra hypoeutectoid, diphasic stainless steel, and prodn. method thereof
CN101956143A (en) * 2010-11-25 2011-01-26 福州大学 Silver-contained antibacterial super duplex-phase stainless steel and fabrication method thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105297125A (en) * 2015-12-02 2016-02-03 成都锦汇科技有限公司 QPQ treatment process applicable to piston ring
CN106399921A (en) * 2016-09-19 2017-02-15 福州大学 QPQ technology for increasing thickness of infiltrated layer on surface of cast duplex stainless steel
CN107675099A (en) * 2017-08-23 2018-02-09 宁波市鄞州亚大汽车管件有限公司 Bent-tube boiler muffler
CN107904552A (en) * 2017-11-22 2018-04-13 昆山三民涂赖电子材料技术有限公司 A kind of saline oxide and its technique for the processing of steel material nitriding with post-oxidizsing
CN108531853A (en) * 2018-06-01 2018-09-14 南京联塑科技实业有限公司 A kind of QPQ salt bath processing methods suitable for die surface processing
CN108531853B (en) * 2018-06-01 2020-06-05 南京联塑科技实业有限公司 QPQ salt bath treatment method suitable for mold surface treatment
CN109161840A (en) * 2018-09-10 2019-01-08 义马丰达设备有限责任公司 Prevent the two opposite methods and its valve member for moving back and forth the occlusion of stainless steel valve member
CN112210721A (en) * 2020-09-30 2021-01-12 福州大学 Antibacterial super-grade duplex stainless steel and preparation method thereof

Also Published As

Publication number Publication date
CN103966523B (en) 2016-02-03

Similar Documents

Publication Publication Date Title
CN103966523B (en) A kind of superfine two-phase stainless cast steel QPQ treatment process
CN103436784B (en) Steel plate for offshore platform and preparation method thereof
CN104018083B (en) Nitrogenous stainless bearing steel and preparation method
CN109338035B (en) Steel for wind driven generator gear box bearing and production method thereof
CN101956134B (en) High-strength high-plasticity copper-containing high-carbon TWIP steel and preparation process thereof
CN103147021B (en) Martensitic stainless steel forged piece and forging and rolling heat treatment integrated production process
CN102021500B (en) Novel super austenite 6Mo type stainless steel
CN107460412B (en) High-strength and high-toughness corrosion-resistant steel and rolling method thereof
CN105177456A (en) Corrosion-resistant bolt alloy material and manufacturing method of bolts
CN101638753B (en) Manufacture method of solution treatment-free high-performance two-phase stainless cast steel
CN103710638A (en) Martensitic stainless steel and manufacturing method thereof
CN101413091B (en) Novel easy-to-cut stainless steel 303B and manufacturing method thereof
CN110819893A (en) Austenitic stainless steel for electronic products and preparation method thereof
CN104451350A (en) Preparation method of seawater-corrosion-resisting high-saturation-induction-intensity magnetically soft alloy
CN102392199B (en) Material-saving heat-resisting antifriction self-lubricating material
CN113549822B (en) High-performance steel plate for resisting marine atmospheric corrosion and production method thereof
CN113549818B (en) High-performance steel plate for resisting corrosion of ocean total immersion area and production method thereof
CN112095052B (en) Corrosion-resistant steel, preparation method and application thereof, corrosion-resistant steel plate and preparation method thereof
CN101693982B (en) Martensite corrosion-resisting steel plate for cutting tool and manufacture method thereof
CN103740976A (en) Cupronickel pipe for ocean engineering and manufacturing method thereof
CN112410675A (en) Rare earth double-phase corrosion-resistant cast stainless steel and manufacturing method thereof
CN102943220B (en) Nickel-saving austenitic stainless steel and fabrication method thereof
CN104357733A (en) Production method of stainless twisted steel
CN112501522B (en) High-temperature-resistant piercing plug and preparation method thereof
CN103736976B (en) Alloy tine on a kind of loosenning tiller and manufacture method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant