CN110819885A - High-strength high-toughness low-temperature nodular cast iron for wind turbine generator - Google Patents

High-strength high-toughness low-temperature nodular cast iron for wind turbine generator Download PDF

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Publication number
CN110819885A
CN110819885A CN201911297622.4A CN201911297622A CN110819885A CN 110819885 A CN110819885 A CN 110819885A CN 201911297622 A CN201911297622 A CN 201911297622A CN 110819885 A CN110819885 A CN 110819885A
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percent
cast iron
strength
temperature
nodular cast
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CN201911297622.4A
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Inventor
唐斌
朱畅
阳雪兵
朱国亮
杨文珺
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XIANGTAN LIYUAN ELECTRIC TOOLING CO Ltd
Xiangtan Electric Manufacturing Co Ltd
XEMC Windpower Co Ltd
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XIANGTAN LIYUAN ELECTRIC TOOLING CO Ltd
XEMC Windpower Co Ltd
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Priority to CN201911297622.4A priority Critical patent/CN110819885A/en
Publication of CN110819885A publication Critical patent/CN110819885A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • C21C1/105—Nodularising additive agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses high-strength high-toughness low-temperature nodular cast iron for a wind turbine generator. The paint comprises the following chemical components in percentage by mass: 3.5 to 3.7 percent of C, 2.0 to 2.09 percent of Si, less than 0.2 percent of Mn, less than 0.026 percent of P, less than 0.015 percent of S, 0.01 to 0.3 percent of Nb, 0.45 to 0.5 percent of Ni, 0.002 to 0.03 percent of Zr, less than 0.03 percent of Re, less than 0.06 percent of Mg, and the balance of Fe. The high-strength high-toughness low-temperature nodular cast iron has excellent performance, can be suitable for low-temperature environments such as-30 ℃ and the like used by wind turbines, and has tensile strength Rm≥400 N/mm2Yield strength Rp0.2≥260 N/mm2Impact energy α at-20 ℃ and-30 DEG Ck≥10J。

Description

High-strength high-toughness low-temperature nodular cast iron for wind turbine generator
Technical Field
The invention relates to nodular cast iron, in particular to high-strength high-toughness low-temperature nodular cast iron.
Background
At present, castings for wind power all adopt QT400-18AL material marks or QT350-22AL material marks specified in GB/T1348 standard. The properties of the QT400-18AL material grade and the QT350-22AL material grade when the size of the casting block is 70X 170mm are shown in Table 1. However, both of these materials cannot meet the requirement of light weight design of castings for wind turbines. With the upsizing of the wind turbine generator, the wind turbine casting needs to select low-temperature nodular cast iron with higher strength so as to realize the light weight of the casting design.
Figure DEST_PATH_IMAGE002
TABLE 1
At present, the research on the nodular cast iron for the wind turbine generator mainly focuses on solving the problem of how to keep the existing strength, so that the impact energy is more than or equal to 10J at-20 ℃, 30 ℃ and 40 ℃. The existing chemical component formula can not ensure that the low-temperature impact energy meets the index while the strength is greatly improved. The CN 108300930A of China improves the number of graphite nodules and refines the graphite nodules by adding V and through the pretreatment and recarburization processes, and obtains the tensile strength R of a test block of 70 x 170mmm≥400 N/mm2Yield strength Rp0 .2≥260 N/mm2And the average value of the impact energy at the temperature of minus 20 ℃ is more than or equal to 10J. Although the invention obtains the high-strength low-temperature nodular cast iron, the low-temperature impact energy of the nodular cast iron can only meet the requirement of minus 20 ℃, and can not meet the requirement of lower temperature, such as minus 30 ℃, and the applicability is not wide. The strength is improved, and simultaneously, the low-temperature impact power is guaranteed to be a pair of spear bodies, so that the strength is improved, and the low-temperature impact power is influenced. And the low-temperature environment used by the wind turbine generator is much lower than-20 ℃, so that the nodular cast iron with higher low-temperature performance needs to be researched.
Disclosure of Invention
Aiming at the technical problems, the invention provides the high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator, which can ensure that the strength is improved on the premise that the low-temperature impact work (average value) at minus 20 ℃ and minus 30 ℃ is more than 10J.
The technical scheme adopted by the invention is as follows:
the high-strength high-toughness low-temperature nodular cast iron comprises the following chemical components in percentage by mass: 3.5 to 3.7 percent of C, 2.0 to 2.09 percent of Si, less than 0.2 percent of Mn, less than 0.026 percent of P, less than 0.015 percent of S, 0.01 to 0.3 percent of Nb, 0.45 to 0.5 percent of Ni, 0.002 to 0.03 percent of Zr, less than 0.03 percent of Re, less than 0.06 percent of Mg, and the balance of Fe.
Further, 3.55-3.65% of C, 2.05-2.09% of Si, 0.1-0.15% of Mn, 0.022-0.025% of P, 0.01-0.014% of S, 0.015-0.08% of Nb, 0.45-0.5% of Ni, 0.002-0.018% of Zr, 0.01-0.02% of Re, 0.035-0.06% of Mg0.06% and the balance of Fe.
Further, 3.58 to 3.64 percent of C, 2.06 to 2.08 percent of Si, 0.1 to 0.14 percent of Mn, 0.023 to 0.025 percent of P, 0.01 to 0.013 percent of S, 0.015 to 0.07 percent of Nb, 0.46 to 0.5 percent of Ni, 0.002 to 0.016 percent of Zr, 0.01 to 0.018 percent of Re, 0.035 to 0.05 percent of Mg0.05 percent, and the balance of Fe.
Further, 3.58 to 3.62 percent of C, 2.06 to 2.07 percent of Si, 0.1 to 0.12 percent of Mn, 0.024 to 0.025 percent of P, 0.01 to 0.011 percent of S, 0.015 to 0.06 percent of Nb, 0.46 to 0.48 percent of Ni, 0.002 to 0.014 percent of Zr, 0.01 to 0.015 percent of Re, 0.035 to 0.04 percent of Mg, and the balance of Fe.
The preparation method of the high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following steps:
(1) smelting: smelting pig iron, foundry returns and scrap steel into molten iron;
(2) carrying out recarburization treatment on the molten iron, and controlling the carbon content to meet the requirement of the mass percentage;
(3) adding Nb and Ni according to the mass percent, and carrying out spheroidizing, inoculation and microalloying treatment on the recarburized molten iron;
(4) and (4) pouring the molten iron subjected to spheroidizing, inoculation and microalloying treatment in the step (3) to obtain the high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator.
The invention has the beneficial effects that:
(1) the high-strength high-toughness low-temperature nodular cast iron has excellent performance and can be suitable for low-temperature environment for wind turbine generatorE.g., -30 deg.C, tensile strength Rm≥400 N/mm2Yield strength Rp0 .2≥260 N/mm2Impact energy α at-20 ℃ and-30 DEG Ck≥10J。
(2) The ductile iron piece greatly improves the strength index and realizes the light weight design of the wind turbine casting under the condition of ensuring the low-temperature impact energy at the temperature of-20 ℃ and-30 ℃.
(3) The invention does not need to change the original casting process, and is suitable for large castings needing lightweight design and small castings needing high strength and low-temperature impact performance.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
Example 1
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.6 percent of C, 2.05 percent of Si, 0.11 percent of Mn, 0.025 percent of P, 0.014 percent of S, 0.022 percent of Nb, 0.49 percent of Ni, 0.016 percent of ZrC, 0.007 percent of Re, 0.056 percent of Mg, and the balance of Fe.
The mechanical properties of the ductile iron member obtained in example 1 are shown in table 2.
TABLE 2
Figure DEST_PATH_IMAGE004
Example 2
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.5 percent of C, 2.0 percent of Si, 0.1 percent of Mn, 0.025 percent of P, 0.01 percent of S, 0.01 percent of Nb, 0.45 percent of Ni, 0.002 percent of Zr, 0.01 percent of Re0.035 percent of Mg, and the balance of Fe.
Example 3
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.55% of C, 2.09% of Si, 0.15% of Mn, 0.022% of P, 0.014% of S, 0.3% of Nb, 0.5% of Ni, 0.03% of Zr, 0.02% of Re0.06% of Mg, and the balance of Fe.
Example 4
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.58 percent of C, 2.05 percent of Si, 0.14 percent of Mn, 0.023 percent of P, 0.013 percent of S, 0.015 percent of Nb, 0.46 percent of Ni, 0.018 percent of ZrC, 0.018 percent of Re, 0.05 percent of Mg and the balance of Fe.
Example 5
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.7 percent of C, 2.06 percent of Si, 0.12 percent of Mn, 0.024 percent of P, 0.011 percent of S, 0.08 percent of Nb, 0.48 percent of Ni, 0.016 percent of Zr, 0.015 percent of Re, 0.04 percent of Mg and the balance of Fe.
Example 6
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.65% of C, 2.08% of Si, 0.18% of Mn, 0.024% of P, 0.011% of S, 0.07% of Nb, 0.48% of Ni, 0.014% of ZrC, 0.015% of Re, 0.04% of Mg and the balance of Fe.
Example 7
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.64 percent of C, 2.04 percent of Si, 0.16 percent of Mn, 0.022 percent of P, 0.012 percent of S, 0.03 percent of Nb, 0.47 percent of Ni, 0.015 percent of ZrC, 0.016 percent of Re, 0.05 percent of Mg and the balance of Fe.
Example 8
The high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator comprises the following chemical components in percentage by mass: 3.62 percent of C, 2.03 percent of Si, 0.17 percent of Mn, 0.021 percent of P, 0.013 percent of S, 0.05 percent of Nb, 0.46 percent of Ni, 0.017 percent of ZrC, 0.018 percent of Re, 0.06 percent of Mg and the balance of Fe.
The preparation method of the high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator in the embodiments 1 to 8 includes the following steps: (1) smelting: smelting pig iron, foundry returns and scrap steel into molten iron;
(2) carrying out recarburization treatment on the molten iron, and controlling the carbon content to meet the mass percentage requirements of each embodiment;
(3) adding Nb and Ni according to the mass percent in each embodiment, and carrying out spheroidizing, inoculation and microalloying treatment on the recarburized molten iron;
(4) and (4) pouring the molten iron subjected to spheroidizing, inoculation and microalloying treatment in the step (3) to obtain the high-strength high-toughness low-temperature nodular cast iron for the wind turbine generator.

Claims (4)

1. The high-strength high-toughness low-temperature nodular cast iron is characterized by comprising the following chemical components in percentage by mass: 3.5 to 3.7 percent of C, 2.0 to 2.09 percent of Si, less than 0.2 percent of Mn, less than 0.026 percent of P, less than 0.015 percent of S, 0.01 to 0.3 percent of Nb, 0.45 to 0.5 percent of Ni0.002 to 0.03 percent of Zr, less than 0.03 percent of Re, less than 0.06 percent of Mg, and the balance of Fe.
2. The high-strength high-toughness low-temperature ductile iron according to claim 1, comprising the following chemical components in percentage by mass: 3.55-3.65% of C, 2.05-2.09% of Si, 0.1-0.15% of Mn, 0.022-0.025% of P, 0.01-0.014% of S, 0.015-0.08% of Nb, 0.45-0.5% of Ni, 0.002-0.018% of Zr, 0.01-0.02% of Re, 0.035-0.06% of Mg0.06% of Fe, and the balance of Fe.
3. The high-strength high-toughness low-temperature ductile iron according to claim 1, comprising the following chemical components in percentage by mass: 3.58 to 3.64 percent of C, 2.06 to 2.08 percent of Si, 0.1 to 0.14 percent of Mn, 0.023 to 0.025 percent of P, 0.01 to 0.013 percent of S, 0.015 to 0.07 percent of Nb, 0.46 to 0.5 percent of Ni, 0.002 to 0.016 percent of Zr, 0.01 to 0.018 percent of Re, 0.035 to 0.05 percent of Mg0.035 percent, and the balance of Fe.
4. The high-strength high-toughness low-temperature ductile iron according to claim 1, comprising the following chemical components in percentage by mass: 3.58 to 3.62 percent of C, 2.06 to 2.07 percent of Si, 0.1 to 0.12 percent of Mn, 0.024 to 0.025 percent of P, 0.01 to 0.011 percent of S, 0.015 to 0.06 percent of Nb, 0.46 to 0.48 percent of Ni, 0.002 to 0.014 percent of Zr, 0.01 to 0.015 percent of Re, 0.035 to 0.04 percent of Mg, and the balance of Fe.
CN201911297622.4A 2019-12-17 2019-12-17 High-strength high-toughness low-temperature nodular cast iron for wind turbine generator Pending CN110819885A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008303434A (en) * 2007-06-08 2008-12-18 Jfe Steel Kk High strength spheroidal graphite iron casting having excellent wear resistance
CN107949649A (en) * 2015-07-22 2018-04-20 艾柯夫铸造有限责任公司 Ferrite cast iron with globular graphite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008303434A (en) * 2007-06-08 2008-12-18 Jfe Steel Kk High strength spheroidal graphite iron casting having excellent wear resistance
CN107949649A (en) * 2015-07-22 2018-04-20 艾柯夫铸造有限责任公司 Ferrite cast iron with globular graphite

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