CN112760563A - Method for processing wear-resistant steel bar for quartz sand rod mill - Google Patents
Method for processing wear-resistant steel bar for quartz sand rod mill Download PDFInfo
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- CN112760563A CN112760563A CN202011529796.1A CN202011529796A CN112760563A CN 112760563 A CN112760563 A CN 112760563A CN 202011529796 A CN202011529796 A CN 202011529796A CN 112760563 A CN112760563 A CN 112760563A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
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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
- C21D1/18—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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a method for processing a wear-resistant steel bar for a quartz sand bar mill, wherein the wear-resistant steel bar is made of 42CrMo steel and comprises the following components: 0.38 to 0.43 percent of carbon, 0.15 to 0.35 percent of silicon, 0.75 to 1.00 percent of manganese, less than 0.035 percent of phosphorus, less than 0.04 percent of sulfur, 0.80 to 1.10 percent of chromium, 0.15 to 0.25 percent of molybdenum, and the balance of iron and inevitable impurities.
Description
Technical Field
The invention relates to the technical field of wear-resistant steel bars, in particular to a method for processing a wear-resistant steel bar for a quartz sand bar mill.
Background
The rod mill is named after the grinding body loaded in the cylinder is a steel rod, and is an industrial grinding device with wide application.
However, the wear-resistant steel bar used in the existing bar mill has large hardness differentiation due to the limitation of component structure and the restriction of production method, the equipment is easily damaged by fragments due to too high hardness during use, the pulp quality is reduced, and when the hardness is too low, the grinding efficiency is low, the finished product quality is poor.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for processing a wear-resistant steel rod for a quartz sand rod mill.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for processing a wear-resistant steel bar for a quartz sand rod mill, wherein the wear-resistant steel bar is made of 42CrMo steel and comprises the following components: 0.38 to 0.43 percent of carbon, 0.15 to 0.35 percent of silicon, 0.75 to 1.00 percent of manganese, 0.035 percent of phosphorus, 0.04 percent of sulfur, 0.80 to 1.10 percent of chromium, 0.15 to 0.25 percent of molybdenum, and the balance of iron and inevitable impurities.
Preferably, the processing method comprises the following steps:
s1, preparing round steel: obtaining round steel through steelmaking, continuous casting and continuous rolling, and taking the round steel as a raw material for later use;
s2, preparing materials: cutting round steel to prepare materials according to the design size requirement of the steel bar to obtain a steel bar raw material;
s3, surface treatment: cleaning the surface of a steel plate raw material, removing ash skin and grease, and washing to obtain a cleaned steel bar;
s4, quenching: placing the cleaned steel bar in a heating furnace, heating to 850-920 ℃, soaking in oil for quenching, and keeping for 5-8 minutes to obtain a quenched steel bar;
s5, tempering: putting the quenched steel bar into a heating furnace, heating to 350-400 ℃, preserving heat for 2-3 hours, and tempering to obtain a tempered steel bar;
s6, detection: and (4) after the steel bar to be tempered is cooled, carrying out surface hardness detection, and packaging after the steel bar is qualified, thus finishing the processing of the wear-resistant steel bar.
Preferably, the preparation of the round steel in the step S1 includes the following steps:
p1, controlling the tapping temperature to be 2200-2400 ℃, controlling the tundish temperature to be 2000-2100 ℃, and drawing steel;
p2, carrying out continuous casting after drawing steel, controlling the size of a square billet to be 160-180 mm, controlling the temperature to be 1200-1300 ℃, and keeping the temperature for 30-50 minutes;
p3, rolling the square billet, controlling the total compression ratio to be 80-85%, and primarily rolling to prepare primary round steel;
p4, finishing the primary round steel to prepare a round rod with the diameter of 50-70 mm;
and P5, spraying and cooling the round bar, and reducing the temperature to 50-80 ℃ to finish the round bar preparation.
Preferably, the stock preparation in the step S2 reserves a processing margin, the length margin is +15 mm to +20 mm, and the diameter margin is +10 mm to +12 mm.
Preferably, the surface treatment of step S3 includes acid washing and rinsing with clean water.
Preferably, the quenching temperature rise rate of the step S4 is 35 to 40 degrees celsius per minute, and the oil immersion temperature is not lower than 240 degrees celsius.
Preferably, the tempering heating rate of the step S5 is 25 to 30 degrees celsius per minute.
Preferably, the heating furnaces of the steps S4 and S5 are induction electric heating furnaces.
Preferably, the surface hardness of the step S6 is HRC 48-55.
According to the method for processing the wear-resistant steel bar for the quartz sand bar mill, provided by the invention, the raw materials with reasonable proportion are adopted, the raw materials are prepared by adopting a continuous casting and rolling process, the efficiency is high, the quality of the raw materials is stable, and then the raw materials are placed at a reasonably controlled temperature for heat treatment, so that the surface hardness and the quality of the steel bar are ensured, the grinding efficiency is improved, the quality of ore pulp is prevented from being influenced, the processing production and the use are facilitated, unqualified products are effectively removed in a final inspection mode, the handling control production is facilitated, and the popularization and the use are facilitated.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A method for processing a wear-resistant steel bar for a quartz sand rod mill, wherein the wear-resistant steel bar is made of 42CrMo steel and comprises the following components: 0.38 to 0.43 percent of carbon, 0.15 to 0.35 percent of silicon, 0.75 to 1.00 percent of manganese, 0.035 percent of phosphorus, 0.04 percent of sulfur, 0.80 to 1.10 percent of chromium, 0.15 to 0.25 percent of molybdenum, and the balance of iron and inevitable impurities.
Preferably, the processing method comprises the following steps:
s1, preparing round steel: obtaining round steel through steelmaking, continuous casting and continuous rolling, and taking the round steel as a raw material for later use;
s2, preparing materials: cutting round steel to prepare materials according to the design size requirement of the steel bar to obtain a steel bar raw material;
s3, surface treatment: cleaning the surface of a steel plate raw material, removing ash skin and grease, and washing to obtain a cleaned steel bar;
s4, quenching: placing the cleaned steel bar in a heating furnace, heating to 850-920 ℃, soaking in oil for quenching, and keeping for 5-8 minutes to obtain a quenched steel bar;
s5, tempering: putting the quenched steel bar into a heating furnace, heating to 350-400 ℃, preserving heat for 2-3 hours, and tempering to obtain a tempered steel bar;
s6, detection: and (4) after the steel bar to be tempered is cooled, carrying out surface hardness detection, and packaging after the steel bar is qualified, thus finishing the processing of the wear-resistant steel bar.
Preferably, the preparation of the round steel in the step S1 includes the following steps:
p1, controlling the tapping temperature to be 2200-2400 ℃, controlling the tundish temperature to be 2000-2100 ℃, and drawing steel;
p2, carrying out continuous casting after drawing steel, controlling the size of a square billet to be 160-180 mm, controlling the temperature to be 1200-1300 ℃, and keeping the temperature for 30-50 minutes;
p3, rolling the square billet, controlling the total compression ratio to be 80-85%, and primarily rolling to prepare primary round steel;
p4, finishing the primary round steel to prepare a round rod with the diameter of 50-70 mm;
and P5, spraying and cooling the round bar, and reducing the temperature to 50-80 ℃ to finish the round bar preparation.
Preferably, the stock preparation in the step S2 reserves a processing margin, the length margin is +15 mm to +20 mm, and the diameter margin is +10 mm to +12 mm.
Preferably, the surface treatment of the S3 step includes acid washing and rinsing with clean water.
Preferably, the quenching temperature rise rate of the step S4 is 35 to 40 degrees celsius per minute, and the oil immersion temperature is not lower than 240 degrees celsius.
Preferably, the tempering temperature rise rate of the step S5 is 25 to 30 degrees celsius per minute.
Preferably, the heating furnaces of the steps S4 and S5 are induction electric heating furnaces.
Preferably, the surface hardness of the step S6 is HRC 48-55.
According to the method for processing the wear-resistant steel bar for the quartz sand bar mill, provided by the invention, the raw materials with reasonable proportion are adopted, the raw materials are prepared by adopting a continuous casting and rolling process, the efficiency is high, the quality of the raw materials is stable, and then the raw materials are placed at a reasonably controlled temperature for heat treatment, so that the surface hardness and the quality of the steel bar are ensured, the grinding efficiency is improved, the quality of ore pulp is prevented from being influenced, the processing production and the use are facilitated, unqualified products are effectively removed in a final inspection mode, the handling control production is facilitated, and the popularization and the use are facilitated.
Example 1
A method for processing a wear-resistant steel bar for a quartz sand rod mill, wherein the wear-resistant steel bar is made of 42CrMo steel and comprises the following components: 0.42% of carbon, 0.25% of silicon, 0.75% of manganese, less than 0.035% of phosphorus, less than 0.04% of sulfur, 1.0% of chromium, 0.20% of molybdenum, and the balance of iron and inevitable impurities.
Preferably, the processing method comprises the following steps:
s1, preparing round steel: obtaining round steel through steelmaking, continuous casting and continuous rolling, and taking the round steel as a raw material for later use;
s2, preparing materials: cutting round steel to prepare materials according to the design size requirement of the steel bar to obtain a steel bar raw material;
s3, surface treatment: cleaning the surface of a steel plate raw material, removing ash skin and grease, and washing to obtain a cleaned steel bar;
s4, quenching: placing the cleaned steel bar in a heating furnace, heating to 850-920 ℃, soaking in oil for quenching, and keeping for 5-8 minutes to obtain a quenched steel bar;
s5, tempering: putting the quenched steel bar into a heating furnace, heating to 350-400 ℃, preserving heat for 2-3 hours, and tempering to obtain a tempered steel bar;
s6, detection: and (4) after the steel bar to be tempered is cooled, carrying out surface hardness detection, and packaging after the steel bar is qualified, thus finishing the processing of the wear-resistant steel bar.
Preferably, the preparation of the round steel in the step S1 includes the following steps:
p1, controlling the tapping temperature to be 2200-2400 ℃, controlling the tundish temperature to be 2000-2100 ℃, and drawing steel;
p2, carrying out continuous casting after drawing steel, controlling the size of a square billet to be 160-180 mm, controlling the temperature to be 1200-1300 ℃, and keeping the temperature for 30-50 minutes;
p3, rolling the square billet, controlling the total compression ratio to be 80-85%, and primarily rolling to prepare primary round steel;
p4, finishing the primary round steel to prepare a round rod with the diameter of 50-70 mm;
and P5, spraying and cooling the round bar, and reducing the temperature to 50-80 ℃ to finish the round bar preparation.
Preferably, the stock preparation in the step S2 reserves a processing margin, the length margin is +15 mm to +20 mm, and the diameter margin is +10 mm to +12 mm.
Preferably, the surface treatment of the S3 step includes acid washing and rinsing with clean water.
Preferably, the quenching temperature rise rate of the step S4 is 35 to 40 degrees celsius per minute, and the oil immersion temperature is not lower than 240 degrees celsius.
Preferably, the tempering temperature rise rate of the step S5 is 25 to 30 degrees celsius per minute.
Preferably, the heating furnaces of the steps S4 and S5 are induction electric heating furnaces.
Preferably, the surface hardness of the step S6 is HRC 48-55.
Example 2
A method for processing a wear-resistant steel bar for a quartz sand rod mill, wherein the wear-resistant steel bar is made of 42CrMo steel and comprises the following components: 0.40% of carbon, 0.205% of silicon, 0.85% of manganese, 0.035% of phosphorus, 0.04% of sulfur, 0.95% of chromium, 0.25% of molybdenum and the balance of iron and inevitable impurities.
Preferably, the processing method comprises the following steps:
s1, preparing round steel: obtaining round steel through steelmaking, continuous casting and continuous rolling, and taking the round steel as a raw material for later use;
s2, preparing materials: cutting round steel to prepare materials according to the design size requirement of the steel bar to obtain a steel bar raw material;
s3, surface treatment: cleaning the surface of a steel plate raw material, removing ash skin and grease, and washing to obtain a cleaned steel bar;
s4, quenching: placing the cleaned steel bar in a heating furnace, heating to 850-920 ℃, soaking in oil for quenching, and keeping for 5-8 minutes to obtain a quenched steel bar;
s5, tempering: putting the quenched steel bar into a heating furnace, heating to 350-400 ℃, preserving heat for 2-3 hours, and tempering to obtain a tempered steel bar;
s6, detection: and (4) after the steel bar to be tempered is cooled, carrying out surface hardness detection, and packaging after the steel bar is qualified, thus finishing the processing of the wear-resistant steel bar.
Preferably, the preparation of the round steel in the step S1 includes the following steps:
p1, controlling the tapping temperature to be 2200-2400 ℃, controlling the tundish temperature to be 2000-2100 ℃, and drawing steel;
p2, carrying out continuous casting after drawing steel, controlling the size of a square billet to be 160-180 mm, controlling the temperature to be 1200-1300 ℃, and keeping the temperature for 30-50 minutes;
p3, rolling the square billet, controlling the total compression ratio to be 80-85%, and primarily rolling to prepare primary round steel;
p4, finishing the primary round steel to prepare a round rod with the diameter of 50-70 mm;
and P5, spraying and cooling the round bar, and reducing the temperature to 50-80 ℃ to finish the round bar preparation.
Preferably, the stock preparation in the step S2 reserves a processing margin, the length margin is +15 mm to +20 mm, and the diameter margin is +10 mm to +12 mm.
Preferably, the surface treatment of the S3 step includes acid washing and rinsing with clean water.
Preferably, the quenching temperature rise rate of the step S4 is 35 to 40 degrees celsius per minute, and the oil immersion temperature is not lower than 240 degrees celsius.
Preferably, the tempering temperature rise rate of the step S5 is 25 to 30 degrees celsius per minute.
Preferably, the heating furnaces of the steps S4 and S5 are induction electric heating furnaces.
Preferably, the surface hardness of the step S6 is HRC 48-55.
Claims (9)
1. A method for processing a wear-resistant steel bar for a quartz sand bar mill is characterized by comprising the following steps: the wear-resistant steel bar is made of 42CrMo steel and comprises the following components: 0.38 to 0.43 percent of carbon, 0.15 to 0.35 percent of silicon, 0.75 to 1.00 percent of manganese, 0.035 percent of phosphorus, 0.04 percent of sulfur, 0.80 to 1.10 percent of chromium, 0.15 to 0.25 percent of molybdenum, and the balance of iron and inevitable impurities.
2. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 1, characterized in that: the processing method comprises the following steps:
s1, preparing round steel: obtaining round steel through steelmaking, continuous casting and continuous rolling, and taking the round steel as a raw material for later use;
s2, preparing materials: cutting round steel to prepare materials according to the design size requirement of the steel bar to obtain a steel bar raw material;
s3, surface treatment: cleaning the surface of a steel plate raw material, removing ash skin and grease, and washing to obtain a cleaned steel bar;
s4, quenching: placing the cleaned steel bar in a heating furnace, heating to 850-920 ℃, soaking in oil for quenching, and keeping for 5-8 minutes to obtain a quenched steel bar;
s5, tempering: putting the quenched steel bar into a heating furnace, heating to 350-400 ℃, preserving heat for 2-3 hours, and tempering to obtain a tempered steel bar;
s6, detection: and (4) after the steel bar to be tempered is cooled, carrying out surface hardness detection, and packaging after the steel bar is qualified, thus finishing the processing of the wear-resistant steel bar.
3. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: the preparation of the round steel in the step S1 comprises the following steps:
p1, controlling the tapping temperature to be 2200-2400 ℃, controlling the tundish temperature to be 2000-2100 ℃, and drawing steel;
p2, carrying out continuous casting after drawing steel, controlling the size of a square billet to be 160-180 mm, controlling the temperature to be 1200-1300 ℃, and keeping the temperature for 30-50 minutes;
p3, rolling the square billet, controlling the total compression ratio to be 80-85%, and primarily rolling to prepare primary round steel;
p4, finishing the primary round steel to prepare a round rod with the diameter of 50-70 mm;
and P5, spraying and cooling the round bar, and reducing the temperature to 50-80 ℃ to finish the round bar preparation.
4. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: and reserving a processing allowance for the prepared material in the step S2, wherein the length allowance is +15 mm to +20 mm, and the diameter allowance is +10 mm to +12 mm.
5. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: the surface treatment of the step S3 includes acid washing and rinsing with clean water.
6. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: and the quenching temperature rise rate of the step S4 is 35-40 ℃ per minute, and the oil immersion temperature is not lower than 240 ℃.
7. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: the tempering heating rate of the step S5 is 25 to 30 degrees celsius per minute.
8. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: the heating furnaces of the steps S4 and S5 are induction electric heating furnaces.
9. The method for processing the wear-resistant steel rod for the quartz sand rod mill according to the claim 2, characterized in that: the surface hardness of the step S6 is HRC 48-55.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959479A (en) * | 2022-05-30 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Steel for rare earth wear-resistant alloy steel bar and production method thereof |
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| 刘晖晖等: "《工程材料》", 31 July 2017, 合肥：合肥工业大学出版社 * |
| 王洪明编: "《结构钢手册》", 31 August 1985, 石家庄：河北科学技术出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959479A (en) * | 2022-05-30 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Steel for rare earth wear-resistant alloy steel bar and production method thereof |
| CN114959479B (en) * | 2022-05-30 | 2023-08-25 | 包头钢铁（集团）有限责任公司 | Steel for rare earth wear-resistant alloy steel bar and production method thereof |
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