CN107447083A - Application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings - Google Patents
Application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings Download PDFInfo
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- CN107447083A CN107447083A CN201710063828.5A CN201710063828A CN107447083A CN 107447083 A CN107447083 A CN 107447083A CN 201710063828 A CN201710063828 A CN 201710063828A CN 107447083 A CN107447083 A CN 107447083A
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- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- 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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention is application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings, including：Quenching liquid mass percentage concentration is 7 20%, 18 70 DEG C of quenching liquid temperature；The weight of casting and quenching liquid ratio is 1: 68；920 1060 DEG C of casting heating-up temperature, it is incubated 2 5h；Casting enters the surface temperature of quenching liquid in the range of 830 950 DEG C；Change the surface temperature of casting lift-off quenching liquid according to environment temperature；Temper is carried out after casting Quenching Treatment in 3 4h.The casting hardness of this method processing can reach 62 66HRC, and impact flexibility can reach 8 10J/cm2, and seldom occur deforming and cracking phenomena.
Description
Technical field
The invention belongs to heat treatment method, more particularly to a kind of PAG water-based hardening liquids in rich chromium cast iron heat treating castings
In application method.
Background technology
PAG water-based hardening liquid Main Ingredients and Appearances are PAG high molecular polymers, and PAG has unique inverse dissolubility, i.e., in water
Dissolubility reduces as temperature raises, and its " cloud point " is 74 DEG C, and PAG occur at 74 DEG C is separated from water phenomenon.
PAG water-based hardening liquid product descriptions are used for method and only make following general regulation, 1. casting and quenching liquid
Weight should be less than 1: 6 (liquid: water), 4. quenching liquids in 20-70 DEG C of 3. quenching liquid concentration in 1: 5,2. quenching liquid temperature than minimum
Periodic cleaning is needed, 5. quenching liquids need periodic agitation, it is ensured that quenching liquid is uniform.
Generally, it is considered that PAG water-based hardening liquids are fast to casting high-temperature region cooling rate, beneficial to improving hardness and structural transformation, and it is low
Cooling rate is slow during especially 300 DEG C of warm area, and workpiece is not easy to crack, so such PAG material is particularly suitable for doing quenching medium.
However, PAG water-based hardening liquids are really not so simple for the practical application of a certain material casting, such as normal
Be respectively with the trade mark BTMCr15, BTMCr20 and BTMCr26 rich chromium cast iron casting application effect it is unsatisfactory, due to use
Method is not proper, makes the phenomenon that the casting after quenching is cracked, deforms commonplace.
The content of the invention
The purpose of the present invention is the application method for disclosing a kind of PAG water-based hardening liquids in rich chromium cast iron heat treating castings,
The application method rich chromium cast iron cast(ing) surface hardness can be made high and uniformly, avoid deforming and ftracture.
The application method of the present invention, including：
1) quenching liquid mass percentage concentration is 7-20%, 18-70 DEG C of quenching liquid temperature；
2) weight of casting and quenching liquid ratio is 1: 6-8；
3) 920-1060 DEG C of casting heating-up temperature；
4) when being incubated 2-5h, wherein casting thickness 2-15mm after casting heating, soaking time 2h；Casting thickness 15-30mm
Soaking time 2.5h；Casting thickness 30-50mm soaking time 3h；During thickness G T.GT.GT 50mm, often increase 25mm soaking times and increase
Add 1h；
5) casting enters the surface temperature of quenching liquid in the range of 830-950 DEG C；
6) during 0 DEG C of environment temperature ＜, the surface temperature of casting lift-off quenching liquid is in the range of 250-300 DEG C；Environment temperature
At 0-10 DEG C, the surface temperature of casting lift-off quenching liquid is in the range of 200-250 DEG C；Environment temperature is at 10-20 DEG C, casting
The surface temperature of lift-off quenching liquid is in the range of 180-220 DEG C；20 DEG C of environment temperature ＞, the surface temperature of casting lift-off quenching liquid
In the range of 160-200 DEG C.
7) temper is carried out after casting Quenching Treatment in 3-4h, temperature is at 280-500 DEG C, soaking time 2.5-4h
After come out of the stove air cooling.
The casting heating-up temperature is 920-960 DEG C of trade mark BTMCr15 casting, or, trade mark BTMCr20 casting
960-1000 DEG C, or, trade mark BTMCr26 1020-1060 DEG C of casting, its Ingredients Weight hundred of the casting of the trade mark BTMCr15
Dividing than composition is：C2.0-3.6, S≤1.2, Mn≤2.0, Cr14-18, Mo≤3.0, Ni≤2.5, Cu≤1.2, S≤0.06, P
≤0.06；Its composition by weight percent of the casting of the trade mark BTMCr20 forms：C2.0-3.3, S≤1.2, Mn≤2.0,
Cr18-23, Mo≤3.0, Ni≤2.5, Cu≤1.2, S≤0.06, P≤0.06；Its composition weight of the casting of the trade mark BTMCr26
Amount percentage forms：C2.0-3.3, S≤1.2, Mn≤2.0, Cr23-30, Mo≤3.0, Ni≤2.5, Cu≤1.2, S≤
0.06, P≤0.06.
When its thickness is more than 60mm, casting is stood the casting of the trade mark BTMCr26 in atmosphere before entering quenching liquid,
Enter quenching liquid when its surface temperature is down to 730-780 DEG C.
Advantages and advantages of the invention are：This method can give full play to the plurality of advantages of PAG water-based hardening liquids,
Ensure Ovshinsky physical efficiency to be cooled down more than the speed of critical cooling rate, and it is short in cooling procedure high temperature stage elapsed-time standards,
Cold stage elapsed-time standards is grown, thus can obtain more martensitic structure, and then improves the hardness and impact flexibility of material.Fortune
The casting hardness handled with this method can reach 62-66HRC, and impact flexibility can reach 8-10J/cm2, and seldom occur
Deformation and cracking phenomena.
Embodiment
The present invention is further illustrated with reference to embodiment.
Embodiment 1：
Rich chromium cast iron heat treating castings using PAG water-based hardening liquids to trade mark BTMCr15, trade mark BTMCr15 casting
Its composition by weight percent forms：C2.0-3.6, S≤1.2, Mn≤2.0, Cr14-18, Mo≤3.0, Ni≤2.5, Cu≤
1.2, S≤0.06, P≤0.06.
Quenching liquid is prepared, its mass percentage concentration is 7-20%, and quenching liquid concentration is measured using flow cup, quenching liquid temperature
18-70 DEG C, and make the weight of casting and quenching liquid ratio be 1: 6-8 according to the weight of more than one piece or single-piece casting.To keep quenching
For liquid temperature degree in allowed band, quenching liquid bath sets heat exchanger device, and cooling for quenching liquid is carried out using water cooling.
Trade mark BTMCr15 rich chromium cast irons casting is heated, 920-960 DEG C of heating-up temperature, 2- is incubated after casting heating
During 5h, wherein casting thickness 2-15mm, soaking time 2h；Casting thickness 15-30mm soaking time 2.5h；Casting thickness 30-
50mm soaking time 3h；During thickness G T.GT.GT 50mm, often increase 25mm soaking times increase 1h.
Casting enters quenching liquid surface temperature after heating and being incubated should be in the range of 830-880 DEG C.
The cast(ing) surface temperature of casting lift-off quenching liquid in the range of 160-300 DEG C, wherein, during 0 DEG C of environment temperature ＜, casting
The surface temperature of part lift-off quenching liquid is in the range of 250-300 DEG C；Environment temperature is at 0-10 DEG C, the table of casting lift-off quenching liquid
Face temperature is in the range of 200-250 DEG C；For environment temperature at 10-20 DEG C, the surface temperature of casting lift-off quenching liquid is in 180-220
In the range of DEG C；20 DEG C of environment temperature ＞, the surface temperature of casting lift-off quenching liquid is in the range of 160-200 DEG C.Temperature survey is adopted
Use infrared radiation thermometer.
Temper is carried out after casting Quenching Treatment in 3-4h, temperature is after 280-500 DEG C, soaking time 2.5-4h
Come out of the stove air cooling.
Embodiment 2：
Rich chromium cast iron heat treating castings using PAG water-based hardening liquids to trade mark BTMCr20, trade mark BTMCr20 casting
Its composition by weight percent forms：C2.0-3.3, S≤1.2, Mn≤2.0, Cr18-23, Mo≤3.0, Ni≤2.5, Cu≤
1.2, S≤0.06, P≤0.06.
Quenching liquid is prepared, its mass percentage concentration is 7-20%, and quenching liquid concentration is measured using flow cup, quenching liquid temperature
18-70 DEG C, and make the weight of casting and quenching liquid ratio be 1: 6-8 according to the weight of more than one piece or single-piece casting.To keep quenching
For liquid temperature degree in allowed band, quenching liquid bath sets heat exchanger device, and cooling for quenching liquid is carried out using water cooling.
Trade mark BTMCr20 rich chromium cast irons casting is heated, 960-1000 DEG C of heating-up temperature, 2- is incubated after casting heating
During 5h, wherein casting thickness 2-15mm, soaking time 2h；Casting thickness 15-30mm soaking time 2.5h；Casting thickness 30-
50mm soaking time 3h；During thickness G T.GT.GT 50mm, often increase 25mm soaking times increase 1h.
Casting enters quenching liquid surface temperature after heating and being incubated should be in the range of 850-900 DEG C.
The cast(ing) surface temperature of casting lift-off quenching liquid in the range of 160-300 DEG C, wherein, during 0 DEG C of environment temperature ＜, casting
The surface temperature of part lift-off quenching liquid is in the range of 250-300 DEG C；Environment temperature is at 0-10 DEG C, the table of casting lift-off quenching liquid
Face temperature is in the range of 200-250 DEG C；For environment temperature at 10-20 DEG C, the surface temperature of casting lift-off quenching liquid is in 180-220
In the range of DEG C；20 DEG C of environment temperature ＞, the surface temperature of casting lift-off quenching liquid is in the range of 160-200 DEG C.Temperature survey is adopted
Use infrared radiation thermometer.
Temper is carried out after casting Quenching Treatment in 3-4h, temperature is after 280-500 DEG C, soaking time 2.5-4h
Come out of the stove air cooling.
Embodiment 3：
Rich chromium cast iron heat treating castings using PAG water-based hardening liquids to trade mark BTMCr26, BTMCr26 casting its into
Percentage by weight composition is divided to be：C2.0-3.3, S≤1.2, Mn≤2.0, Cr23-30, Mo≤3.0, Ni≤2.5, Cu≤1.2, S
≤ 0.06, P≤0.06.
Quenching liquid is prepared, its mass percentage concentration is 7-20%, and quenching liquid concentration is measured using flow cup, quenching liquid temperature
18-70 DEG C, and make the weight of casting and quenching liquid ratio be 1: 6-8 according to the weight of more than one piece or single-piece casting.To keep quenching
For liquid temperature degree in allowed band, quenching liquid bath sets heat exchanger device, and cooling for quenching liquid is carried out using water cooling.
Trade mark BTMCr26 rich chromium cast irons casting is heated, 1020-1060 DEG C of heating-up temperature, be incubated after casting heating
During 2-5h, wherein casting thickness 2-15mm, soaking time 2h；Casting thickness 15-30mm soaking time 2.5h；Casting thickness
30-50mm soaking time 3h；During thickness G T.GT.GT 50mm, often increase 25mm soaking times increase 1h.Casting is heated and is incubated laggard
The surface temperature for entering quenching liquid should be in the range of 900-950 DEG C.
When its casting thickness is more than 60mm, casting is stood in atmosphere before entering quenching liquid, treats that its surface temperature is down to
Enter quenching liquid at 730-780 DEG C.
The cast(ing) surface temperature of trade mark BTMCr26 rich chromium cast iron casting lift-off quenching liquids in the range of 160-300 DEG C, its
In, during 0 DEG C of environment temperature ＜, the surface temperature of casting lift-off quenching liquid is in the range of 250-300 DEG C；Environment temperature is at 0-10 DEG C
When, the surface temperature of casting lift-off quenching liquid is in the range of 200-250 DEG C；Environment temperature is at 10-20 DEG C, casting lift-off quenching
The surface temperature of liquid is in the range of 180-220 DEG C；20 DEG C of environment temperature ＞, the surface temperature of casting lift-off quenching liquid is in 160-
In the range of 200 DEG C.Temperature survey uses infrared radiation thermometer.
Temper is carried out after casting Quenching Treatment in 3-4h, temperature is after 280-500 DEG C, soaking time 2.5-4h
Come out of the stove air cooling.
Claims (3)
- Application method of the 1.PAG water-based hardening liquids in rich chromium cast iron heat treating castings, it is characterised in that including：1) quenching liquid mass percentage concentration is 7-20%, 18-70 DEG C of quenching liquid temperature；2) weight of casting and quenching liquid ratio is 1: 6-8；3) 920-1060 DEG C of casting heating-up temperature；4) when being incubated 2-5h, wherein casting thickness 2-15mm after casting heating, soaking time 2h；Casting thickness 15-30mm guarantor Warm time 2.5h；Casting thickness 30-50mm soaking time 3h；During thickness G T.GT.GT 50mm, often increase 25mm soaking times increase 1h；5) casting enters the surface temperature of quenching liquid in the range of 830-950 DEG C；6) during 0 DEG C of environment temperature ＜, the surface temperature of casting lift-off quenching liquid is in the range of 250-300 DEG C；Environment temperature is in 0- At 10 DEG C, the surface temperature of casting lift-off quenching liquid is in the range of 200-250 DEG C；Environment temperature is at 10-20 DEG C, casting lift-off The surface temperature of quenching liquid is in the range of 180-220 DEG C；20 DEG C of environment temperature ＞, the surface temperature of casting lift-off quenching liquid exist In the range of 160-200 DEG C.7) temper is carried out after casting Quenching Treatment in 3-4h, temperature goes out after 280-500 DEG C, soaking time 2.5-4h Stove air cooling.
- 2. application method of the PAG water-based hardening liquids according to claim 1 in rich chromium cast iron heat treating castings, its feature It is：The casting heating-up temperature is 920-960 DEG C of trade mark BTMCr15 casting, or, trade mark BTMCr20 casting 960- 1000 DEG C, or, trade mark BTMCr26 1020-1060 DEG C of casting, its composition by weight percent of the casting of the trade mark BTMCr15 Composition is：C2.0-3.6, S≤1.2, Mn≤2.0, Cr14-18, Mo≤3.0, Ni≤2.5, Cu≤1.2, S≤0.06, P≤ 0.06；Its composition by weight percent of the casting of the trade mark BTMCr20 forms：C2.0-3.3, S≤1.2, Mn≤2.0, Cr18-23, Mo≤3.0, Ni≤2.5, Cu≤1.2, S≤0.06, P≤0.06；Its composition weight of the casting of the trade mark BTMCr26 Amount percentage forms：C2.0-3.3, S≤1.2, Mn≤2.0, Cr23-30, Mo≤3.0, Ni≤2.5, Cu≤1.2, S≤ 0.06, P≤0.06.
- 3. application method of the PAG water-based hardening liquids according to claim 2 in rich chromium cast iron heat treating castings, its feature It is：When its thickness is more than 60mm, casting is stood the casting of the trade mark BTMCr26 in atmosphere before entering quenching liquid, is treated Its surface temperature enters quenching liquid when being down to 730-780 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710063828.5A CN107447083A (en) | 2017-01-19 | 2017-01-19 | Application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings |
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| CN201710063828.5A CN107447083A (en) | 2017-01-19 | 2017-01-19 | Application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112553413A (en) * | 2020-11-20 | 2021-03-26 | 二重（德阳）重型装备有限公司 | Planet carrier, casting material and heat treatment process thereof |
| CN113481425A (en) * | 2021-05-25 | 2021-10-08 | 暨南大学 | High-wear-resistance high-chromium white cast iron and preparation method thereof |
| CN115747627A (en) * | 2022-10-25 | 2023-03-07 | 安徽华聚新材料有限公司 | High-hardness high-toughness high-chromium cast iron grinding ball and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112553413A (en) * | 2020-11-20 | 2021-03-26 | 二重（德阳）重型装备有限公司 | Planet carrier, casting material and heat treatment process thereof |
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| CN113481425B (en) * | 2021-05-25 | 2022-01-07 | 暨南大学 | High-wear-resistance high-chromium white cast iron and preparation method thereof |
| CN115747627A (en) * | 2022-10-25 | 2023-03-07 | 安徽华聚新材料有限公司 | High-hardness high-toughness high-chromium cast iron grinding ball and preparation method thereof |
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Application publication date: 20171208 |