CN110306100A - The method of-kind of optimization CN7M stainless cast steel part performance - Google Patents
The method of-kind of optimization CN7M stainless cast steel part performance Download PDFInfo
- Publication number
- CN110306100A CN110306100A CN201810248796.0A CN201810248796A CN110306100A CN 110306100 A CN110306100 A CN 110306100A CN 201810248796 A CN201810248796 A CN 201810248796A CN 110306100 A CN110306100 A CN 110306100A
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- China
- Prior art keywords
- furnace
- melting
- steel
- cn7m
- argon
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910001203 Alloy 20 Inorganic materials 0.000 title claims abstract description 10
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 7
- 238000005457 optimization Methods 0.000 title abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 239000011575 calcium Substances 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 239000011572 manganese Substances 0.000 claims abstract description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 238000006392 deoxygenation reaction Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 238000004220 aggregation Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000004064 dysfunction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to the manufacture of corrosion resisting valve, about the method for-kind of optimization CN7M stainless cast steel part performance, solves usually with intermediate frequency furnace melting, tensile strength occur lower than standard regulation, metallographic there are a large amount of blister carbide aggregation precipitation phenomenons.Using this method; using baking furnace charge when melting; it is sequentially added into burner hearth; furnace bottom argon filling gas shielded, after furnace charge is all melting down, first manganese addition; again plus ferrosilicon deoxidation; chemical component is controlled according to ASTM A351 CN7M standard, and increases the element of Nb between 0.38-0.45%, carries out final deoxidizing with 0.1-0.2% silico-calcium.Solution heat treatment is carried out with 1160 DEG C, tensile strength is improved, is cheated in metallographic Ovshinsky volume matrix without connected ferrite, optimize physicochemical property.
Description
Technical field
The present invention relates to anticorrosion valve manufacture, about the method for-kind of optimization CN7M stainless cast steel part performance, solve
Intermediate frequency furnace melting is usually used, tensile strength occurs and is provided lower than standard, metallographic there are a large amount of blister carbide aggregation precipitation phenomenons.
Using this method, tensile strength is improved, is cheated in metallographic Ovshinsky volume matrix without connected ferrite, optimizes physicochemical property.
Background technique
When manufacturing corrosion-resistant use CN7M stainless valve casting, the intermediate frequency furnace melting of use, casting is also easy to produce stomata, mechanics
Tensile strength provides that 425Mpa, metallographic show a large amount of blister carbide aggregations and be precipitated lower than standard in performance, austenite square
There is connected ferrite hole in battle array, intercrystalline corrosion is not up to standard, and casting is substandard product.
Summary of the invention
The object of the present invention is to provide the methods of-kind of optimization CN7M stainless cast steel part performance, using this method, when melting
Using new furnace charge, it is sequentially added into burner hearth after baking, furnace bottom argon filling gas shielded, after furnace charge is all melting down, first manganese addition, then plus silicon
Iron deoxidation, chemical component work out inner quality standard, mainly C≤0.05%, increase by 8 times of C and contain according to ASTM A351 CN7M standard
The Nb element of amount, quantity carry out final deoxidizing between 0.38-0.45%, with 0.1-0.2% silico-calcium, and casting is consolidated with 1160 DEG C
Molten heat treatment.Casting oxidized blowhole is few, improves tensile strength, Rm >=450Mpa, and ASTM A262-14 method is pressed in intercrystalline corrosion
A test, 200 times, 500 times of metallographs show in Ovshinsky volume matrixes without connected ferrite hole, meet the requirements, optimize physics and chemistry
Performance improves corrosion resistance.
Technical solution of the present invention are as follows: the method for-kind of optimization CN7M stainless cast steel part performance, process are as follows: furnace charge preparation-
Argon-filled protection-deoxygenation of liquid steel-refinement crystal grain-final deoxidizing-standing casting-solution heat treatment；
The content of process is:
Furnace charge prepares: virgin material is all used in melting, and all furnace charges are both needed to toast, and copper will be baked to >=500 DEG C, and nickel plate will be baked to
>=800 DEG C, charging sequence first adds stainless steel waste material, and afterwards plus nickel, copper, molybdenum, ferrochrome are eventually adding, and reduces oxidation and scaling loss；
Argon-filled protection: furnace bottom leads to argon gas protection when melting, and argon gas not blown on liquid steel level directly, and slagging agent is added to cover molten steel
Surface prevents steel water and air from contacting, anti-molten steel oxidation；
Deoxygenation of liquid steel: after furnace charge is all melting down, first manganese addition, then plus ferrosilicon deoxidation, then sample examination chemical component；
Refine crystal grain: after chemical component meets inner quality standard, C≤0.05%, increases the Nb element of 8 times of C contents, quantity in principle
Between 0.38-0.45%, crystal grain is refined, reduces steel belt roof bolt brittleness；
Final deoxidizing: final deoxidizing is carried out with 0.1-0.2% silico-calcium；
Stand casting: smelting furnace, which has a power failure, to be stood, and is closed for argon system, is poured to tapping temperature；
Solution heat treatment: solution heat treatment temperature >=1160 DEG C, heating rate≤150 DEG C/h, soaking time >=3h, the every increasing of wall thickness
Add 25mm to extend 1h, enters water time≤60s, water temperature≤40 DEG C, residence time >=30min in water.
The positive effect of the present invention is:
Casting oxidized blowhole is few, improves tensile strength, Rm >=450Mpa, and intercrystalline corrosion is tested by ASTM A262-14 method A,
200 times, 500 times of metallographs show in Ovshinsky volume matrixes without connected ferrite hole, meet the requirements, optimize physicochemical property,
Improve corrosion resistance.
Specific embodiment
Furnace charge prepares: virgin material is all used in melting, if selecting foundry returns, it is necessary to can just make after refining to foundry returns
With all furnace charges are both needed to toast, and copper will be baked to >=500 DEG C, and nickel plate will be baked to >=800 DEG C, and charging sequence first adds stainless steel
Waste material, afterwards plus nickel, copper, molybdenum.Ferrochrome is eventually adding, and reduces oxidation and scaling loss；
Argon-filled protection: the intermediate frequency furnace of selection will have a furnace argon filling airway dysfunction, and furnace bottom argon filling gas shielded when melting adds slagging agent to cover steel
Water surface prevents steel water and air from contacting, anti-molten steel oxidation；
Deoxygenation of liquid steel: after furnace charge is all melting down, first manganese addition, then plus ferrosilicon deoxidation, then sample examination chemical component；
Refine crystal grain: after chemical component meets inner quality standard, C≤0.05%, increases the Nb element of 8 times of C contents, quantity in principle
Between 0.38-0.45%, crystal grain is refined, reduces steel belt roof bolt brittleness；
Final deoxidizing: final deoxidizing is carried out with 0.1-0.2% silico-calcium；
Stand casting: the standing that has a power failure 3-5 min is poured to tapping temperature；
Solution heat treatment: solution heat treatment temperature >=1160 DEG C, heating rate≤150 DEG C/h, soaking time >=3h, the every increasing of wall thickness
Add 25mm to extend 1h, enters water time≤60s, water temperature≤40 DEG C, residence time >=30min in water；
Polishing cleaning casting, with≤Φ 1mm stainless steel ball impeller blasting casting, physical and chemical inspection, non-destructive testing, casting qualification enters
Library.
Claims (1)
1. a kind of method for optimizing CN7M stainless cast steel part performance, process are as follows: furnace charge preparation-argon-filled protection-molten steel is de-
Oxygen-refinement crystal grain-final deoxidizing-standing casting-solution heat treatment；
The content of process is:
Furnace charge prepares: virgin material is all used in melting, and all furnace charges are both needed to toast, and copper will be baked to >=500 DEG C, and nickel plate will be baked to
>=800 DEG C, charging sequence first adds stainless steel waste material, and afterwards plus nickel, copper, molybdenum, ferrochrome are eventually adding, and reduces oxidation and scaling loss；
Argon-filled protection: furnace bottom leads to argon gas protection when melting, and argon gas not blown on liquid steel level directly, and slagging agent is added to cover molten steel
Surface prevents steel water and air from contacting, anti-molten steel oxidation；
Deoxygenation of liquid steel: after furnace charge is all melting down, first manganese addition, then plus ferrosilicon deoxidation, then sample examination chemical component；
Refine crystal grain: after chemical component meets inner quality standard, C≤0.05%, increases the Nb element of 8 times of C contents, quantity in principle
Between 0.38-0.45%, crystal grain is refined, reduces steel belt roof bolt brittleness；
Final deoxidizing: final deoxidizing is carried out with 0.1-0.2% silico-calcium；
Stand casting: smelting furnace, which has a power failure, to be stood, and is closed for argon system, is poured to tapping temperature；
Solution heat treatment: solution heat treatment temperature >=1160 DEG C, heating rate≤150 DEG C/h, soaking time >=3h, the every increasing of wall thickness
Add 25mm to extend 1h, enters water time≤60s, water temperature≤40 DEG C, residence time >=30min in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810248796.0A CN110306100A (en) | 2018-03-25 | 2018-03-25 | The method of-kind of optimization CN7M stainless cast steel part performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810248796.0A CN110306100A (en) | 2018-03-25 | 2018-03-25 | The method of-kind of optimization CN7M stainless cast steel part performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110306100A true CN110306100A (en) | 2019-10-08 |
Family
ID=68073428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810248796.0A Pending CN110306100A (en) | 2018-03-25 | 2018-03-25 | The method of-kind of optimization CN7M stainless cast steel part performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110306100A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002235153A (en) * | 2001-02-05 | 2002-08-23 | Daido Steel Co Ltd | High strength, high corrosion resistant non-magnetic stainless steel |
| CN101397633A (en) * | 2007-09-30 | 2009-04-01 | 宝山钢铁股份有限公司 | Sulphur and copper-containing free-cutting stainless steel and preparation method thereof |
| CN102634739A (en) * | 2012-05-03 | 2012-08-15 | 江苏锦越航空合金材料有限公司 | Corrosion-resisting stainless steel and manufacturing process thereof |
| CN102634741A (en) * | 2012-05-03 | 2012-08-15 | 江苏锦越航空合金材料有限公司 | High-temperature heat-resistant and corrosion-resistant stainless steel and manufacturing method thereof |
| CN104550733A (en) * | 2015-01-14 | 2015-04-29 | 浙江天瑞钢业有限公司 | Composite casting technology capable of preventing neck part of valve cap of low-temperature brake valve from being deformed |
-
2018
- 2018-03-25 CN CN201810248796.0A patent/CN110306100A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002235153A (en) * | 2001-02-05 | 2002-08-23 | Daido Steel Co Ltd | High strength, high corrosion resistant non-magnetic stainless steel |
| CN101397633A (en) * | 2007-09-30 | 2009-04-01 | 宝山钢铁股份有限公司 | Sulphur and copper-containing free-cutting stainless steel and preparation method thereof |
| CN102634739A (en) * | 2012-05-03 | 2012-08-15 | 江苏锦越航空合金材料有限公司 | Corrosion-resisting stainless steel and manufacturing process thereof |
| CN102634741A (en) * | 2012-05-03 | 2012-08-15 | 江苏锦越航空合金材料有限公司 | High-temperature heat-resistant and corrosion-resistant stainless steel and manufacturing method thereof |
| CN104550733A (en) * | 2015-01-14 | 2015-04-29 | 浙江天瑞钢业有限公司 | Composite casting technology capable of preventing neck part of valve cap of low-temperature brake valve from being deformed |
Non-Patent Citations (1)
| Title |
|---|
| 孙方红等: "《工程训练》", 31 August 2016 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20191008 |