CN110484695B - Cast steel for welded structure and preparation method and application thereof - Google Patents
Cast steel for welded structure and preparation method and application thereof Download PDFInfo
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- CN110484695B CN110484695B CN201910870051.2A CN201910870051A CN110484695B CN 110484695 B CN110484695 B CN 110484695B CN 201910870051 A CN201910870051 A CN 201910870051A CN 110484695 B CN110484695 B CN 110484695B
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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
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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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- 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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
The invention relates to the technical field of cast steel for railways, in particular to cast steel for a welded structure and a preparation method and application thereof. The invention provides cast steel for a welded structure. According to the description of the embodiment, the cast steel for the welded structure has the tensile strength of 618-812 MPa, the yield strength of 442-589 MPa, the elongation of 27.2-27.5%, the reduction of area of 58.6-65.8%, the impact energy of 82-126J, good mechanical strength and carbon content of less than or equal to 0.21%, and good welding performance.
Description
Technical Field
The invention relates to the technical field of cast steel for railways, in particular to cast steel for a welded structure and a preparation method and application thereof.
Background
As cast steel for welded structures for railways, it is required to have good mechanical properties and welding properties. The high and low content of C directly determines the welding performance of the cast steel for welded structures. The carbon content is low, and the welding performance is better; however, the reduction in the C content directly results in a reduction in the mechanical strength of cast steel for welded structures. Therefore, it is a main direction of research to simultaneously provide a welded structure cast steel for a railway with good mechanical strength and welding performance.
Disclosure of Invention
The invention aims to provide cast steel for a welded structure, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides cast steel for a welding structure, which comprises the following alloy elements in percentage by mass: less than or equal to 0.21 percent of C, 0.3-0.6 percent of Si, 1.1-1.3 percent of Mn1, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.10 percent of Ni, less than or equal to 0.15 percent of Cr, less than or equal to 0.10 percent of Mo, and the balance of iron and inevitable impurities.
Preferably, the alloy comprises the following alloy elements in percentage by mass: 0.21% of C, 0.49% of Si, 1.3% of Mn, 0.011% of P, 0.002% of S, 0.04% of Ni, 0.13% of Cr, 0.10% of Mo and the balance of iron and inevitable impurities.
Preferably, the following alloy elements are contained in percentage by mass: 0.19% of C, 0.56% of Si, 1.28% of Mn, 0.012% of P, 0.003% of S, 0.05% of Ni, 0.12% of Cr, 0.08% of Mo, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the cast steel for the welding structure, which comprises the following steps:
and sequentially carrying out quenching treatment and tempering treatment on the cast ingot with the element ratio to obtain the steel casting for the welded structure.
Preferably, the quenching treatment process comprises: firstly, heating the cast ingot to 640-660 ℃, keeping the temperature for 0.5-1.5 h, then continuing heating to 910-930 ℃, keeping the temperature for 4.5-5.5 h, cooling to 890-910 ℃, keeping the temperature for 1.0-2.0 h, and cooling.
Preferably, the tempering temperature is 610-630 ℃, and the tempering time is 4.5-5.5 h.
The invention also provides application of the cast steel for the welded structure in the technical scheme or the cast steel for the welded structure prepared by the preparation method in the technical scheme in preparation of locomotive rib plates for railways.
The invention provides cast steel for a welding structure, which comprises the following alloy elements in percentage by mass: less than or equal to 0.21 percent of C, 0.3-0.6 percent of Si, 1.1-1.3 percent of Mn1, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.10 percent of Ni, less than or equal to 0.15 percent of Cr, less than or equal to 0.10 percent of Mo, and the balance of iron and inevitable impurities. By adjusting the types and the use amounts of the alloy components, the cast steel for the welding structure has excellent welding performance while ensuring high strength, good plasticity and toughness. According to the description of the embodiment, the cast steel for the welded structure has the tensile strength of 618-812 MPa, the yield strength of 442-589 MPa, the elongation of 20.2-27.5%, the reduction of area of 58.6-65.8%, the impact energy of 82-126J, better mechanical strength and better welding performance, and the carbon content is less than or equal to 0.21%.
Detailed Description
The invention provides cast steel for a welding structure, which comprises the following alloy elements in percentage by mass: less than or equal to 0.21 percent of C, 0.3-0.6 percent of Si, 1.1-1.3 percent of Mn1, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.10 percent of Ni, less than or equal to 0.15 percent of Cr, less than or equal to 0.10 percent of Mo, and the balance of iron and inevitable impurities.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
According to the mass percentage, the cast steel for the welding structure comprises less than or equal to 0.21% of C, and the content of C is preferably 0.19-0.21%; in the present invention, the content of C described above can ensure that the steel for welded structures has good welding properties.
The cast steel for the welding structure comprises 0.3-0.6% of Si by mass percent, wherein the content of Si is preferably 0.49-0.56%, and more preferably 0.4-0.5%. The addition of Si is controlled within the above range, has the effect of improving the solid solution strengthening of ferrite, and determines the comprehensive mechanical properties (tensile strength, yield strength, impact absorption power and the like) of the low-temperature nodular cast iron material.
The cast steel for the welded structure comprises 1.1-1.3% of Mn by mass percent, wherein the content of Mn is preferably 1.28-1.3%, and more preferably 1.18-1.22%. The Mn can eliminate and reduce the hot brittleness of the low-temperature nodular cast iron material caused by sulfur, and improve the hot workability of the low-temperature nodular cast iron material.
According to the mass percentage, the cast steel for the welding structure comprises P which is less than or equal to 0.020%, and the content of P is preferably 0.011-0.012%; the addition of P can improve the strength and atmospheric corrosion resistance of the alloy steel.
According to the mass percentage, the cast steel for the welding structure comprises less than or equal to 0.015% of S, and the content of S is preferably 0.002-0.03%; the addition of S can improve the cutting performance of the cast steel for the welded structure.
According to the mass percentage, the cast steel for the welding structure comprises less than or equal to 0.10% of Ni, and the content of Ni is preferably 0.04-0.05%; the addition of Ni can improve the strength of the cast steel for welded structures.
According to the mass percentage, the cast steel for the welding structure comprises less than or equal to 0.15% of Cr, and the content of Cr is preferably 0.12-0.13%; the addition of Cr can refine the structure carbide and the crystal grains in the alloy steel and improve the toughness of the alloy steel.
According to the mass percentage, the cast steel for the welding structure comprises less than or equal to 0.10% of Mo, and the content of the Mo is preferably 0.008-0.1%; the Mo has stronger carbide forming capability, so that the cast steel with lower carbon content also has higher mechanical strength.
The low-temperature nodular cast iron material also comprises the balance of iron and inevitable impurities in percentage by mass.
The invention also provides a preparation method of the cast steel for the welding structure, which is characterized by comprising the following steps:
and sequentially carrying out quenching treatment and tempering treatment on the cast ingot with the element ratio to obtain the steel casting for the welded structure.
The preparation method of the ingot with the element proportion is not limited in any way, and the ingot is obtained by adopting a smelting process well known to a person skilled in the art.
In the present invention, the quenching treatment is preferably performed by: firstly, heating the cast ingot to 640-660 ℃, keeping the temperature for 0.5-1.5 h, then continuing heating to 910-930 ℃, keeping the temperature for 4.5-5.5 h, cooling to 890-910 ℃, keeping the temperature for 1.0-2.0 h, and cooling; more preferably: firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuing to heat to 920 ℃, keeping the temperature for 5.0h, cooling to 900 ℃, keeping the temperature for 1.5h, and cooling; the temperature rise rate and the temperature drop rate of the temperature rise and the temperature drop are not limited in any way, and the temperature rise and the temperature drop can be respectively carried out by adopting the temperature rise rate and the temperature drop rate which are well known by the technical personnel in the field. In the present invention, the cooling is preferably water cooling.
In the invention, the tempering temperature is preferably 610-630 ℃, more preferably 615-625 ℃, and most preferably 620 ℃; the tempering time is preferably 4.5-5.5 hours, and more preferably 4.8-5.2 hours. After the tempering treatment is finished, the steel is preferably cooled to obtain cast steel for a welding structure; the cooling is not particularly limited in the present invention and may be carried out by a process known to those skilled in the art.
The invention also provides application of the cast steel for the welded structure in the technical scheme or the cast steel for the welded structure prepared by the preparation method in the technical scheme in preparation of locomotive rib plates for railways.
The cast steel for welded structures according to the present invention, and the method for producing the same and the use thereof will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The cast steel for the welded structure comprises the following components: the alloy comprises the following alloy elements in percentage by mass: 0.21% of C, 0.49% of Si, 1.3% of Mn, 0.011% of P, 0.002% of S, 0.04% of Ni, 0.13% of Cr, 0.10% of Mo and the balance of iron and inevitable impurities;
preparing an ingot with the element ratio;
firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuously heating to 920 ℃, keeping the temperature for 5.0h, cooling to 900 ℃, keeping the temperature for 1.5h, cooling by water, tempering (620 ℃, 4.5 h), and cooling to obtain the cast steel for the welded structure.
Example 2
The cast steel for the welded structure comprises the following components: the alloy comprises the following alloy elements in percentage by mass: 0.21% of C, 0.49% of Si, 1.3% of Mn, 0.011% of P, 0.002% of S, 0.04% of Ni, 0.13% of Cr, 0.10% of Mo and the balance of iron and inevitable impurities;
preparing an ingot with the element ratio;
firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuously heating to 930 ℃, keeping the temperature for 5.0h, cooling to 910 ℃, keeping the temperature for 1.5h, cooling by water, tempering (630 ℃, 4.5 h), and cooling to obtain the cast steel for the welded structure.
Example 3
The cast steel for the welded structure comprises the following components: the alloy comprises the following alloy elements in percentage by mass: 0.21% of C, 0.49% of Si, 1.3% of Mn, 0.011% of P, 0.002% of S, 0.04% of Ni, 0.13% of Cr, 0.10% of Mo and the balance of iron and inevitable impurities;
preparing an ingot with the element ratio;
firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuously heating to 910 ℃, keeping the temperature for 5.0h, cooling to 890 ℃, keeping the temperature for 1.5h, cooling by water, tempering (610 ℃, 4.5 h), and cooling to obtain the cast steel for the welded structure.
Example 4
The cast steel for the welded structure comprises the following components: the alloy comprises the following alloy elements in percentage by mass: 0.19% of C, 0.56% of Si, 1.28% of Mn, 0.012% of P, 0.003% of S, 0.05% of Ni, 0.12% of Cr, 0.08% of Mo and the balance of Fe and inevitable impurities;
preparing an ingot with the element ratio;
firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuously heating to 920 ℃, keeping the temperature for 5.0h, cooling to 900 ℃, keeping the temperature for 1.5h, cooling by water, tempering (620 ℃, 4.5 h), and cooling to obtain the cast steel for the welded structure.
Example 5
The cast steel for the welded structure comprises the following components: the alloy comprises the following alloy elements in percentage by mass: 0.19% of C, 0.56% of Si, 1.28% of Mn, 0.012% of P, 0.003% of S, 0.05% of Ni, 0.12% of Cr, 0.08% of Mo and the balance of Fe and inevitable impurities;
preparing an ingot with the element ratio;
firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuously heating to 930 ℃, keeping the temperature for 5.0h, cooling to 910 ℃, keeping the temperature for 1.5h, cooling by water, tempering (630 ℃, 4.5 h), and cooling to obtain the cast steel for the welded structure.
Example 6
The cast steel for the welded structure comprises the following components: the alloy comprises the following alloy elements in percentage by mass: 0.19% of C, 0.56% of Si, 1.28% of Mn, 0.012% of P, 0.003% of S, 0.05% of Ni, 0.12% of Cr, 0.08% of Mo and the balance of Fe and inevitable impurities;
preparing an ingot with the element ratio;
firstly, heating the cast ingot to 650 ℃, keeping the temperature for 1.0h, then continuously heating to 910 ℃, keeping the temperature for 5.0h, cooling to 890 ℃, keeping the temperature for 1.5h, cooling by water, tempering (610 ℃, 4.5 h), and cooling to obtain the cast steel for the welded structure.
Test example 1
Mechanical property tests were performed on the cast steels for welded structures described in examples 1 to 6 in accordance with the DINI7182-1992 standard, and the results are shown in table 1:
TABLE 1 mechanical Properties of alloy steels according to examples 1 to 6
From the above embodiments, the cast steel for welded structures provided by the invention has good mechanical properties and welding properties.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The cast steel for the welded structure is characterized by comprising the following alloy elements in percentage by mass: less than or equal to 0.21 percent of C, 0.3-0.6 percent of Si, 1.1-1.3 percent of Mn1, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.10 percent of Ni, less than or equal to 0.15 percent of Cr, less than or equal to 0.10 percent of Mo, and the balance of iron and inevitable impurities;
the preparation method of the cast steel for the welded structure comprises the following steps:
sequentially quenching and tempering the cast ingot with the element ratio to obtain a steel casting for a welded structure;
the quenching treatment process comprises the following steps: firstly, heating the cast ingot to 640-660 ℃, keeping the temperature for 0.5-1.5 h, then continuing heating to 910-930 ℃, keeping the temperature for 4.5-5.5 h, cooling to 890-910 ℃, keeping the temperature for 1.0-2.0 h, and cooling;
the tempering temperature is 610-630 ℃, and the tempering time is 4.5-5.5 h.
2. Cast steel for welded structures according to claim 1, characterized by comprising, in mass%: 0.21% of C, 0.49% of Si, 1.3% of Mn, 0.011% of P, 0.002% of S, 0.04% of Ni, 0.13% of Cr, 0.10% of Mo and the balance of iron and inevitable impurities;
the preparation method of the cast steel for the welded structure comprises the following steps:
sequentially quenching and tempering the cast ingot with the element ratio to obtain a steel casting for a welded structure;
the quenching treatment process comprises the following steps: firstly, heating the cast ingot to 640-660 ℃, keeping the temperature for 0.5-1.5 h, then continuing heating to 910-930 ℃, keeping the temperature for 4.5-5.5 h, cooling to 890-910 ℃, keeping the temperature for 1.0-2.0 h, and cooling;
the tempering temperature is 610-630 ℃, and the tempering time is 4.5-5.5 h.
3. Cast steel for welded structures according to claim 1, characterized by comprising, in mass%: 0.19% of C, 0.56% of Si, 1.28% of Mn, 0.012% of P, 0.003% of S, 0.05% of Ni, 0.12% of Cr, 0.08% of Mo and the balance of Fe and inevitable impurities;
the preparation method of the cast steel for the welded structure comprises the following steps:
sequentially quenching and tempering the cast ingot with the element ratio to obtain a steel casting for a welded structure;
the quenching treatment process comprises the following steps: firstly, heating the cast ingot to 640-660 ℃, keeping the temperature for 0.5-1.5 h, then continuing heating to 910-930 ℃, keeping the temperature for 4.5-5.5 h, cooling to 890-910 ℃, keeping the temperature for 1.0-2.0 h, and cooling;
the tempering temperature is 610-630 ℃, and the tempering time is 4.5-5.5 h.
4. A method for producing a cast steel for welded structures as claimed in any one of claims 1 to 3, comprising the steps of:
sequentially quenching and tempering the cast ingot with the element ratio to obtain a steel casting for a welded structure;
the quenching treatment process comprises the following steps: firstly, heating the cast ingot to 640-660 ℃, keeping the temperature for 0.5-1.5 h, then continuing heating to 910-930 ℃, keeping the temperature for 4.5-5.5 h, cooling to 890-910 ℃, keeping the temperature for 1.0-2.0 h, and cooling;
the tempering temperature is 610-630 ℃, and the tempering time is 4.5-5.5 h.
5. Use of the cast steel for welded structures according to any one of claims 1 to 3 or the cast steel for welded structures produced by the production method according to claim 4 for producing a rib plate for railway vehicles.
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| CN100420766C (en) * | 2007-01-24 | 2008-09-24 | 中国重型汽车集团有限公司 | Cast steel and method for preparing same |
| CN101440459A (en) * | 2008-12-25 | 2009-05-27 | 重庆江通机械有限责任公司 | Cast steel material for mine support and preparation thereof |
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| CN103014529B (en) * | 2012-12-18 | 2019-03-08 | 中车眉山车辆有限公司 | A kind of Low-carbon martensite cast steel material for railway wagon coupler |
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Denomination of invention: A cast steel for welding structure and its preparation method and Application Effective date of registration: 20211123 Granted publication date: 20210326 Pledgee: Bank of Beijing Limited by Share Ltd. Changsha branch Pledgor: YIYANG ZIJING WELFARE CASTING Co.,Ltd. Registration number: Y2021430000074 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220425 Granted publication date: 20210326 Pledgee: Bank of Beijing Limited by Share Ltd. Changsha branch Pledgor: YIYANG ZIJING WELFARE CASTING Co.,Ltd. Registration number: Y2021430000074 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A cast steel for welding structure and its preparation method and Application Effective date of registration: 20220524 Granted publication date: 20210326 Pledgee: Agricultural Bank of China Co.,Ltd. Yiyang Branch Pledgor: YIYANG ZIJING WELFARE CASTING Co.,Ltd. Registration number: Y2022980006054 |