CN110157985B - Steel plate for chord web arm of crawler crane and thermal hardening and tempering process performed on steel plate - Google Patents
Steel plate for chord web arm of crawler crane and thermal hardening and tempering process performed on steel plate Download PDFInfo
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- CN110157985B CN110157985B CN201910470207.8A CN201910470207A CN110157985B CN 110157985 B CN110157985 B CN 110157985B CN 201910470207 A CN201910470207 A CN 201910470207A CN 110157985 B CN110157985 B CN 110157985B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005496 tempering Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- 238000003466 welding Methods 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 5
- 229910052802 copper Inorganic materials 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 abstract description 3
- 230000000171 quenching effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention discloses a steel plate for a crawler crane chord web arm, which is used for manufacturing a welded steel pipe for the crawler crane chord web arm, and comprises the following components in percentage by mass: 0.04-0.20% of C, 0.08-0.70% of Si, 1.0-1.90% of Mn, 0.4-1.20% of Cr, 0.2-1.0% of Ni, 0.1-0.9% of Cu, 0.001-0.04% of V, 0.03-0.06% of Nb0.05-0.18% of Ti, 0.01-0.06% of Al and the balance of Fe. The steel plate for the string web arm of the crawler crane has the advantages of high strength, long fatigue life, strong wear resistance, coexistence of performance and plasticity, strong anti-damage capability, easiness in corrosion resistance, easiness in welding and the like through effective proportioning of C, Mn, Cr, Mo, V, Ni and Cu. The performance of the steel plate is further improved by the quenching and tempering heat treatment process of the steel plate, and finally the tensile strength Rm of the steel plate is more than or equal to 820MPa, the yield strength ReH of the steel plate is more than or equal to 780 MPa, and the elongation coefficient As of the steel plate is more than or equal to 20 percent.
Description
Technical Field
The invention relates to the field of manufacturing of crawler crane chord web arms, in particular to a steel plate for the crawler crane chord web arms and a thermal hardening and tempering process for the steel plate.
Background
The crawler crane is a movable arm rotating crawler crane walking by using a crawler and is main lifting equipment indispensable to engineering lifting operation. Because the operating characteristics of the crawler crane determine that the crawler crane belongs to special and safety equipment, strict requirements can be put on safety indexes.
Steel used for chord web arms of the conventional crawler crane is of the national standard Q355B, and the conventional crawler crane has the performance that the tensile strength Rm is 470-670 MPa and the yield strength ReH is more than or equal to 355 MPa. However, the corrosion resistance, weldability and other properties of the existing steel are not ideal, and meanwhile, according to the development trend and the needs of the crane industry, the tensile strength and the yield strength are required to be greatly improved, so that the existing steel cannot meet the needs gradually.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a steel plate for a chord web arm of a crawler crane, which has high strength, strong wear resistance and high weldability, and simultaneously greatly improves the tensile strength and the yield strength.
In order to achieve the purpose, the invention adopts the technical scheme that:
a steel plate for a crawler crane chord web arm is used for manufacturing a welded steel pipe for the crawler crane chord web arm, and comprises the following components in percentage by mass: 0.04-0.20% of C, 0.08-0.70% of Si, 1.0-1.90% of Mn, 0.4-1.20% of Cr, 0.2-1.0% of Ni, 0.1-0.9% of Cu, 0.001-0.04% of V, 0.03-0.06% of Nb0.05-0.18% of Ti, 0.01-0.06% of Al and the balance of Fe.
The invention also aims to provide a thermal tempering process for the steel plate, by which the performance of the steel plate can be further improved, the phenomena of large grain size, residual Widmannstatten structure, unstable structure, low mechanical property and poor plasticity in the steel plate are changed, and the aims of super wear resistance, high toughness, long fatigue, strong safety are fulfilled.
In order to achieve the purpose, the invention adopts the technical scheme that:
a thermal tempering process for a steel plate for a crawler crane chord web arm, the thermal tempering process comprising the steps of:
(1) heating the steel plate to 930-950 ℃ at a heating speed of 16-21 ℃/s, and preserving heat for 40-45 minutes;
(2) rapidly cooling the steel plate subjected to heat preservation in the step (1) to below 300 ℃ at the speed of 210-230 ℃/s, and then naturally cooling;
(3) and (3) heating the steel plate naturally cooled in the step (2) to 300-350 ℃ at a heating speed of 15-20 ℃/s, preserving the temperature for 70-80 minutes, and naturally cooling.
Preferably, the heating of the steel sheet is performed using a heating coil.
Preferably, in the step (2), the rapid cooling is performed by water cooling.
Further preferably, the water-cooled cooling medium is tap water.
Preferably, in the step (2), the steel sheet is first rapidly cooled to 300 ℃ or less, and then naturally cooled to room temperature.
Preferably, in the step (3), the steel plate is naturally cooled to room temperature after being kept warm.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the steel plate for the chord web arm of the crawler crane, the steel plate has the advantages of high strength, long fatigue life, strong wear resistance, coexistence of performance and plasticity, strong anti-damage capability, easiness in corrosion prevention, easiness in welding and the like through effective proportioning of C, Mn, Cr, Mo, V, Ni and Cu. The performance of the steel plate is further improved by the quenching and tempering heat treatment process of the steel plate, and finally the tensile strength Rm of the steel plate is more than or equal to 820MPa, the yield strength ReH of the steel plate is more than or equal to 780 MPa, and the elongation coefficient As of the steel plate is more than or equal to 20 percent.
Detailed Description
The technical solution of the present invention is further illustrated below with reference to specific examples.
A steel plate for a crawler crane chord web arm is used for manufacturing a welded steel pipe for the crawler crane chord web arm, and comprises the following components in percentage by mass: 0.04-0.20% of C, 0.08-0.70% of Si, 1.0-1.90% of Mn, 0.4-1.20% of Cr, 0.2-1.0% of Ni, 0.1-0.9% of Cu, 0.001-0.04% of V, 0.03-0.06% of Nb0.05-0.18% of Ti, 0.01-0.06% of Al and the balance of Fe. The steel plate also contains a few inevitable impurities in the smelting process, and the performance of the steel plate is not affected. Here, due to uncertainty in steel smelting, the contents of the elements of the steel sheet of the present invention cannot be uniquely determined, and can be embodied only within a certain range.
Here, C: the method is a main index for determining material performance, a proper amount of index is beneficial to the requirement of the method, yield point and tensile strength cannot be achieved when the yield point and the tensile strength are too low, plasticity, welding performance and corrosion performance are reduced when the yield point and the tensile strength are too high, and cold brittleness and aging sensitivity are improved; si: the steel has the functions of reduction and deoxidation, the elastic limit of the steel is improved, and the welding performance is reduced and the surface corrosion resistance is poor due to overhigh elastic limit; mn: the method has the effects of improving hardenability, improving hot workability, ensuring that the material has enough toughness, strength and hardness, and reducing welding performance and corrosion performance if the hardenability is too high; cr: the function is to improve the hardness, corrosion resistance and wear resistance, and the plasticity and toughness are reduced when the hardness is too high; ni: the function is to improve the strength, and simultaneously keep good plasticity, toughness and corrosion resistance; cu: the toughness and the corrosion resistance are improved, and if the toughness and the corrosion resistance are too high, hot brittleness is easily generated; v: the function is to refine the structure grains and improve the tempering strength; nb: the function is to refine the structure crystal grains, improve the toughness, and reduce the toughness when the toughness is too high; ti: the function is to strengthen the internal organization compactness, reduce the aging sensitivity and cold brittleness and improve the welding performance; al: the deoxidizer is used for refining structure grains, improving impact toughness, and reducing welding and cutting processing performances when the deoxidizer is too high.
By proportioning certain contents of C, Cr and main alloy elements, the strength of the steel can be effectively guaranteed, and the weldability and plasticity indexes of the material are improved; mn is a main alloy element of the material, and can play an effective solid solution strengthening role in a certain proportion content; the proportion of Nb, V and Ti minor alloy elements can prevent coarse and refined grain size of crystal grains and improve the mechanical property of the steel; the elasticity and impact toughness of the steel can be effectively improved by proportioning certain Al; the corrosion resistance and the wear resistance of the steel can be effectively improved by proportioning a certain amount of Cr and Cu; the Si with a certain proportion can effectively improve the adhesive force of the material surface to the preservative solution. The assembly welding effectiveness is effectively guaranteed through effective proportioning of C, Mn, Cr, Mo, V, Ni and Cu. The prepared steel plate has the advantages of high strength, long fatigue life, strong wear resistance, coexistence of performance and plasticity, strong anti-damage capability, easy corrosion resistance, easy welding and the like. By controlling the content of elements such as Si, the enrichment effect of the Si element is fully exerted, and corresponding compounds are generated with the elements such as C, W, so that the effect of strong spraying adhesion is achieved, and the steel plate has excellent corrosion resistance.
Through calculation, the carbon equivalent of the steel plate is less than or equal to 0.40%, the Pcm value is less than or equal to 0.25%, the effectiveness of assembly welding is effectively guaranteed, and the fatigue service life is prolonged by more than 5%.
Compared with steel of national standard Q355B in the prior art, the tensile strength of the steel plate is increased from original Rm 470-670 MPa to Rm not less than 820MPa, the yield strength is increased from original ReH not less than 355 MPa to ReH not less than 780 MPa, the elongation coefficient As is not less than 20%, and the steel plate can better adapt to the technical requirements of the string web arm of the crawler crane.
A thermal tempering process for the steel plate comprises the following steps:
(1) and heating the steel plate to 930-950 ℃ at a heating speed of 16-21 ℃/s, and preserving the heat for 40-45 minutes.
(2) And (2) rapidly cooling the steel plate subjected to heat preservation in the step (1) to below 300 ℃ at the speed of 210-230 ℃/s, and then naturally cooling to room temperature. Here, the rapid cooling method is water cooling, and the cooling medium is tap water.
(3) And (3) heating the steel plate naturally cooled in the step (2) to 300-350 ℃ at a heating speed of 15-20 ℃/s, preserving the temperature for 70-80 minutes, and naturally cooling to room temperature.
In this example, the steel sheet was heated using a heating coil.
The quenching and tempering heat treatment on the steel plate can further improve the performance of the steel plate, change the phenomena of large grain size, residual Widmannstatten structure, unstable structure, low mechanical property and poor plasticity in the steel plate, and achieve the aims of super wear resistance, high toughness, long fatigue, strong safety, so that the prepared steel pipe can completely meet the development trend and the requirement of the crane industry.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (5)
1. A thermal hardening and tempering process for a steel plate used for a chord web arm of a crawler crane is characterized by comprising the following steps of: the steel plate comprises the following components in percentage by mass: 0.04-0.20% of C, 0.08-0.70% of Si, 1.0-1.90% of Mn, 0.4-1.20% of Cr, 0.2-1.0% of Ni, 0.1-0.9% of Cu, 0.001-0.04% of V, 0.03-0.06% of Nb, 0.05-0.18% of Ti, 0.01-0.06% of Al and the balance of Fe;
the thermal hardening and tempering process comprises the following steps:
(1) heating the steel plate to 930-950 ℃ at a heating speed of 16-21 ℃/s, and preserving heat for 40-45 minutes;
(2) rapidly cooling the steel plate subjected to heat preservation in the step (1) to below 300 ℃ at the speed of 210-230 ℃/s, and then naturally cooling, wherein the rapid cooling mode is water cooling;
(3) and (3) heating the steel plate naturally cooled in the step (2) to 300-350 ℃ at a heating speed of 15-20 ℃/s, preserving the temperature for 70-80 minutes, and naturally cooling.
2. The thermal tempering process for the steel plate of the crawler crane chord web arm according to the claim 1, characterized in that: the steel sheet is heated using a heating coil.
3. The thermal tempering process for the steel plate of the crawler crane chord web arm according to the claim 1, characterized in that: the water-cooled cooling medium is tap water.
4. The thermal tempering process for the steel plate of the crawler crane chord web arm according to the claim 1, characterized in that: in the step (2), the steel sheet is first rapidly cooled to 300 ℃ or less, and then naturally cooled to room temperature.
5. The thermal tempering process for the steel plate of the crawler crane chord web arm according to the claim 1, characterized in that: and (3) naturally cooling the steel plate to room temperature after heat preservation.
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| CN201910470207.8A CN110157985B (en) | 2019-05-31 | 2019-05-31 | Steel plate for chord web arm of crawler crane and thermal hardening and tempering process performed on steel plate |
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| CN201910470207.8A CN110157985B (en) | 2019-05-31 | 2019-05-31 | Steel plate for chord web arm of crawler crane and thermal hardening and tempering process performed on steel plate |
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| CN110157985B true CN110157985B (en) | 2021-09-21 |
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Denomination of invention: Steel plates for the chord arm of crawler cranes and their heat treatment process Effective date of registration: 20240102 Granted publication date: 20210921 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: Jiangsu Huacheng Industry Pipe Making Corp. Registration number: Y2024980000045 |