CN112522603A - Non-quenched and tempered steel for shaft parts and preparation method thereof - Google Patents
Non-quenched and tempered steel for shaft parts and preparation method thereof Download PDFInfo
- Publication number
- CN112522603A CN112522603A CN202011270181.1A CN202011270181A CN112522603A CN 112522603 A CN112522603 A CN 112522603A CN 202011270181 A CN202011270181 A CN 202011270181A CN 112522603 A CN112522603 A CN 112522603A
- Authority
- CN
- China
- Prior art keywords
- percent
- quenched
- shaft parts
- steel
- forging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
-
- 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
-
- 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
-
- 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
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
-
- 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
- C22C38/40—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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- 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)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to non-quenched and tempered steel for shaft parts and a preparation method thereof, wherein the non-quenched and tempered steel for the shaft parts comprises the following components in percentage by mass: 0.3 to 0.5 percent of C, 0.2 to 0.8 percent of Si, 1.4 to 1.6 percent of Mn, less than or equal to 0.03 percent of P, 0.03 to 0.075 percent of S, 0.4 to 0.6 percent of Cr, 0.012 to 0.02 percent of V, less than or equal to 0.2 percent of Mo, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Ni, and the balance of Fe; wherein the carbon equivalent satisfies Ceq ═ C + (1/7) Si + (1/5) Mn + (1/9) Cr + (1.54) V, and Ceq is 0.75-0.85. According to the invention, the contents of C, Mn, Cr and V are adjusted and the carbon equivalent is controlled according to the composition of the non-quenched and tempered steel, so that the toughness of the non-quenched and tempered steel is improved, the tensile strength, the hardness, the elongation after fracture and the reduction of area are improved, and the cutting performance is obviously superior to that of a quenched and tempered 40Cr material.
Description
Technical Field
The invention relates to the field of non-quenched and tempered steel, in particular to non-quenched and tempered steel for shaft parts and a preparation method thereof.
Background
At present, non-quenched and tempered steel is an energy-saving steel grade without a quenching and tempering process, and more attention is paid to the advantages of energy conservation, consumption reduction, emission reduction, production flow shortening and the like. The non-quenched and tempered steel comprehensively utilizes various strengthening means, and the difference between the mechanical properties of the non-quenched and tempered steel and the mechanical properties of the quenching and tempering process is reduced. At present, the development of non-quenched and tempered steel grades at home and abroad forms two main technical trends: firstly, the content of V of micro-alloy elements is increased to 0.25-0.30 percent, and the micro-alloy elements are used for replacing quenched and tempered steel with higher alloy content represented by 42CrMoH and the like; and secondly, the strength is improved by means of controlling a part cooling technology, solid solution, controlled forging and the like, and the low-alloy quenched and tempered steel represented by 40Cr is replaced.
Automobile shaft parts are widely applied to automobile chassis parts, such as half shafts, connecting rods, crankshafts, transmission shafts, related accessories and the like. The parts are often accompanied with working conditions such as torsion, bending and the like in the using process, so that the used materials are required to have higher strength. In this regard, non-heat-treated steel materials have been partially used in the production of commercial vehicle chassis parts in Japan and the like, with the maximum amount of use accounting for 50 to 60% of heat-treated parts.
For example, CN102071368A discloses a medium carbon non-quenched and tempered steel for low-cost forging, which uses carbon, manganese, titanium and other elements as main alloying elements. After the material is forged and formed, a ferrite plus pearlite structure is formed under the conditions of air cooling or air cooling and the like. The method has the advantages of comprehensively utilizing the strengthening effect of C, Mn, Ti and the like to completely or partially replace alloy elements with higher cost, such as V, Nb and the like, reducing the material alloying cost, omitting the quenching and tempering treatment process, simplifying the forging heat treatment process, saving energy and reducing the production cost.
WO2015043061A1 discloses non-quenched and tempered steel and a production process thereof, the production process of the non-quenched and tempered steel sets a cooling step after a finish rolling step, strong cooling and weak cooling are alternately cooled, the strong cooling can ensure that the surface temperature of steel is rapidly reduced, the weak cooling can ensure that the temperature of a steel core is gradually diffused to the surface, and then the strong cooling is carried out, so that heat is rapidly dissipated, according to actual needs, the strong cooling and the weak cooling can be alternately carried out for a plurality of times, and the temperature of the steel core and the temperature of the surface tend to be consistent in a short time by a water-through cooling mode combining the strong cooling and the weak cooling, thereby ensuring the uniformity of the mechanical property of the steel, and improving the production efficiency.
However, the non-quenched and tempered steel provided in the prior art still has the problems of poor tensile strength, low hardness, low elongation after fracture and low reduction of area, substandard performance when being used for shaft parts, short service life and the like.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a non-quenched and tempered steel for shaft parts and a preparation method thereof, which obviously enhance the toughness, the elongation at break, the compressive strength and the hardness, wherein the tensile strength is 833-955MPa, the hardness is 235-295HBW, the elongation A after fracture is 12-19.5%, and the elongation Z at fracture is 30-52%.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides non-quenched and tempered steel for shaft parts, which comprises the following components in percentage by mass: 0.3 to 0.5 percent of C, 0.2 to 0.8 percent of Si, 1.4 to 1.6 percent of Mn, less than or equal to 0.03 percent of P, 0.03 to 0.075 percent of S, 0.4 to 0.6 percent of Cr, 0.012 to 0.02 percent of V, less than or equal to 0.2 percent of Mo, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Ni, and the balance of Fe;
wherein the carbon equivalent satisfies Ceq ═ C + (1/7) Si + (1/5) Mn + (1/9) Cr + (1.54) V, and Ceq is 0.75-0.85.
According to the invention, the contents of C, Mn, Cr and V are adjusted and the carbon equivalent is controlled according to the composition of the non-quenched and tempered steel, so that the toughness of the non-quenched and tempered steel is improved, the tensile strength, the hardness, the elongation after fracture and the reduction of area are improved, and the cutting performance is obviously superior to that of a quenched and tempered 40Cr material.
In the invention, the carbon equivalent satisfies the condition that each element symbol in the formula is the mass percentage of each element, and the requirement of the shaft part on the strength is considered in the range, and the cutting force cannot be too large, thereby ensuring that the processing technology can be executed.
In the present invention, the non-heat-treated steel for shaft parts may contain 0.3 to 0.5% by mass of C, and examples thereof include 0.3%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39%, 0.4%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, and 0.5%, but not limited to the above-mentioned values, and other values not listed in this range are also applicable.
In the present invention, the non-heat-treated steel for shaft parts may contain 0.2 to 0.8% by mass of Si, for example, 0.2%, 0.24%, 0.26%, 0.28%, 0.3%, 0.32%, 0.34%, 0.36%, 0.38%, 0.4%, 0.42%, 0.44%, 0.46%, 0.48%, 0.5%, 0.52%, 0.54%, 0.56%, 0.58%, 0.6%, 0.62%, 0.64%, 0.66%, 0.68%, 0.7%, 0.72%, 0.74%, 0.76%, 0.78%, or 0.8%, but is not limited to the above-mentioned values, and other values not listed in this range are also applicable.
In the present invention, the Mn content in the non-heat-treated steel for shaft parts is 1.4 to 1.6% by mass, and may be, for example, 1.4%, 1.41%, 1.42%, 1.43%, 1.44%, 1.45%, 1.46%, 1.47%, 1.48%, 1.49%, 1.5%, 1.51%, 1.52%, 1.53%, 1.54%, 1.55%, 1.56%, 1.57%, 1.58%, 1.59%, or 1.6%, and the like, but is not limited to the above-mentioned values, and other values not listed in the range are also applicable.
In the present invention, the non-heat treated steel for shaft parts contains P in an amount of 0.03% by mass or less, and may be, for example, 0.03%, 0.029%, 0.028%, 0.027%, 0.026%, 0.025%, 0.024%, 0.023%, 0.022%, 0.021%, 0.020%, 0.019%, 0.018%, 0.017%, 0.016%, 0.015%, 0.014%, 0.013%, 0.012%, 0.011%, or 0.01%, but not limited to the above-mentioned values, and other values not listed in this range may be similarly applied.
In the present invention, the non-heat-treated steel for shaft parts contains 0.03 to 0.075% by mass of S, and may include, for example, 0.03%, 0.032%, 0.034%, 0.036%, 0.038%, 0.04%, 0.042%, 0.044%, 0.046%, 0.048%, 0.05%, 0.052%, 0.054%, 0.056%, 0.058%, 0.06%, 0.062%, 0.064%, 0.066%, 0.068%, 0.07%, 0.072%, 0.074%, or 0.075%, but not limited to the above-mentioned values, and other values not listed in this range may also be applicable.
In the present invention, the non-heat-treated steel for shaft parts may contain Cr in an amount of 0.4 to 0.6% by mass, for example, 0.4%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, 0.5%, 0.51%, 0.52%, 0.53%, 0.54%, 0.55%, 0.56%, 0.57%, 0.58%, 0.59%, or 0.6%, but not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In the present invention, V in the non-heat-treated steel for shaft parts may be 0.012 to 0.02% by mass, for example, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, or 0.02%, but is not limited to the above-mentioned numerical values, and other numerical values not listed in the above range are also applicable.
In the present invention, the non-heat-treated steel for shaft parts contains Mo in an amount of 0.2% by mass or less, and may be, for example, 0.2%, 0.19%, 0.18%, 0.17%, 0.16%, 0.15%, 0.14%, 0.13%, 0.12%, 0.11%, 0.1%, or 0.05%, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In the present invention, the non-heat-treated steel for shaft parts may contain Cu in an amount of 0.3% by mass or less, and examples thereof include 0.3%, 0.29%, 0.28%, 0.27%, 0.26%, 0.25%, 0.24%, 0.23%, 0.22%, 0.21%, 0.2%, 0.19%, 0.18%, 0.17%, 0.16%, 0.15%, 0.14%, 0.13%, 0.12%, 0.11%, 0.1%, 0.05%, and 0.01%, but are not limited to the above-mentioned values, and other values not listed in this range are also applicable.
In the present invention, the non-heat-treated steel for shaft parts may contain not more than 0.3% by mass of Ni, and examples thereof include 0.3%, 0.29%, 0.28%, 0.27%, 0.26%, 0.25%, 0.24%, 0.23%, 0.22%, 0.21%, 0.2%, 0.19%, 0.18%, 0.17%, 0.16%, 0.15%, 0.14%, 0.13%, 0.12%, 0.11%, 0.1%, 0.05%, and 0.01%, but are not limited to the above-mentioned values, and other values not listed in this range are also applicable.
As a preferable technical scheme of the invention, the non-quenched and tempered steel for the shaft parts comprises the following components in percentage by mass: 0.3 to 0.38 percent of C, 0.22 to 0.36 percent of Si, 1.45 to 1.56 percent of Mn, less than or equal to 0.03 percent of P, 0.037 to 0.055 percent of S, 0.43 to 0.53 percent of Cr, 0.014 to 0.018 percent of V, less than or equal to 0.2 percent of Mo, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Ni, and the balance of Fe.
As a preferable aspect of the present invention, the microstructure of the non-quenched and tempered steel for shaft parts includes pearlite and ferrite.
In a second aspect, the present invention provides a method for producing the non-quenched and tempered steel for shaft parts according to the first aspect, the method comprising: and heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts.
According to the preparation method provided by the invention, the specific 2-time forging process is adopted, so that the prepared non-quenched and tempered steel has good performance, and the toughness, the elongation at break, the compressive strength and the hardness are obviously enhanced.
As a preferred embodiment of the present invention, the end point temperature of the heating is 1000 ℃ 1240, for example, 1000 ℃, 1010 ℃, 1020 ℃, 1030 ℃, 1040 ℃, 1050 ℃, 1060 ℃, 1070 ℃, 1080 ℃, 1090 ℃, 1100 ℃, 1110 ℃, 1120 ℃, 1130 ℃, 1140 ℃, 1150 ℃, 1160 ℃, 1170 ℃, 1180 ℃, 1190 ℃, 1200 ℃, 1210 ℃, 1220 ℃, 1230 ℃ or 1240 ℃ and the like, but is not limited to the recited values, and other values not recited in the range are also applicable.
In a preferred embodiment of the present invention, the heating time is 5 to 6min, for example, 5min, 5.1min, 5.2min, 5.3min, 5.4min, 5.5min, 5.6min, 5.7min, 5.8min, 5.9min or 6min, but is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
In a preferred embodiment of the present invention, the temperature of the first forging is 1050 DEG, 1150 ℃, for example 1050 ℃, 1060 ℃, 1070 ℃, 1080 ℃, 1090 ℃, 1100 ℃, 1110 ℃, 1120 ℃, 1130 ℃, 1140 ℃ or 1150 ℃, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the temperature of the second forging is 925 ℃ 975 ℃, and may be 925 ℃, 928 ℃, 930 ℃, 932 ℃, 934 ℃, 936 ℃, 938 ℃, 940 ℃, 942 ℃, 944 ℃, 946 ℃, 948 ℃, 950 ℃, 952 ℃, 954 ℃, 956 ℃, 958 ℃, 960 ℃, 962 ℃, 964 ℃, 966 ℃, 968 ℃, 970 ℃, 972 ℃, 974 ℃ or 975 ℃, for example, but not limited to the values listed, and other values not listed in this range are also applicable.
As a preferred technical solution of the present invention, the cooling means includes air cooling and/or air cooling.
In the invention, the first stage forging completes the operation of the preform, the initial temperature is controlled between 1050 ℃ and 1150 ℃, the end temperature is controlled at 925 ℃ and 975 ℃, the end temperature of the first stage is the initial temperature of the second stage, and the end temperature of the second stage forging is controlled above 900 ℃, and then the preform enters a cooling area.
As a preferred technical solution of the present invention, the preparation method comprises: heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts;
the temperature of the first forging is 1050-1150 ℃;
the temperature of the second forging is 925-.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the hardness of the non-quenched and tempered steel is improved by controlling the contents of C, Mn, Cr and V in the composition of the non-quenched and tempered steel and controlling a proper carbon equivalent, and the toughness, the elongation at break, the compressive strength and the hardness are obviously enhanced by adopting a specific forging process, wherein the tensile strength is 833-955MPa, the hardness is 235-295HBW, the elongation A after fracture is 12-19.5 percent, and the elongation Z of the fracture surface is 30-52 percent.
Drawings
FIG. 1 is a metallographic photograph of a flange yoke made of non-heat-treated steel according to example 1 of the present invention;
FIG. 2 is a metallographic photograph of a weld yoke made of non-quenched and tempered steel according to example 2 of the present invention;
FIG. 3 is a metallographic photograph of a spline shaft made of non-heat-treated steel in example 3 of the present invention.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a non-quenched and tempered steel for shaft parts, which comprises the following components in percentage by mass: 0.4% of C, 0.3% of Si, 1.5% of Mn, 0.03% of P, 0.04% of S, 0.5% of Cr, 0.021% of V, 0.2% of Mo, 0.3% of Cu, 0.3% of Ni and the balance of Fe;
wherein the carbon equivalent satisfies Ceq ═ C + (1/7) Si + (1/5) Mn + (1/9) Cr + (1.54) V, Ceq is 0.83;
the preparation method of the non-quenched and tempered steel comprises the following steps: heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts;
the heating end point temperature is 1200 ℃, and the time is 5 min;
the temperature of the first forging is 1050 ℃;
the temperature of the second forging was 950 ℃.
The cooling mode is air cooling.
The properties of the obtained non-quenched and tempered steel are detailed in table 1, the obtained non-quenched and tempered steel is prepared into a flange yoke, a metallographic picture is detailed in fig. 1, and it can be seen from the picture that the metallographic structures are all pearlite plus ferrite structures.
Example 2
The embodiment provides a non-quenched and tempered steel for shaft parts, which comprises the following components in percentage by mass: 0.3% of C, 0.8% of Si, 1.4% of Mn, 0.01% of P, 0.03% of S, 0.6% of Cr, 0.012% of V, 0.1% of Mo, 0.2% of Cu, 0.1% of Ni and the balance of Fe;
wherein the carbon equivalent satisfies Ceq ═ C + (1/7) Si + (1/5) Mn + (1/9) Cr + (1.54) V, Ceq is 0.78;
the preparation method of the non-quenched and tempered steel comprises the following steps: heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts;
the heating end point temperature is 1240 ℃, and the time is 6 min;
the temperature of the first forging is 1050 ℃;
the temperature of the second forging was 975 ℃.
The cooling mode is air cooling.
The properties of the obtained non-quenched and tempered steel are detailed in table 1, the obtained non-quenched and tempered steel is prepared into a welding fork, a metallographic picture is detailed in fig. 2, and it can be seen from the picture that the metallographic structures are all pearlite plus ferrite structures.
Example 3
The embodiment provides a non-quenched and tempered steel for shaft parts, which comprises the following components in percentage by mass: 0.45% of C, 0.2% of Si, 1.5% of Mn, 0.02% of P, 0.075% of S, 0.4% of Cr, 0.02% of V, 0.05% of Mo, 0.1% of Cu, 0.2% of Ni and the balance of Fe;
wherein the carbon equivalent satisfies Ceq ═ C + (1/7) Si + (1/5) Mn + (1/9) Cr + (1.54) V, Ceq is 0.85;
the preparation method of the non-quenched and tempered steel comprises the following steps: heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts;
the heating end point temperature is 1000 ℃, and the time is 5.5 min;
the temperature of the first forging is 1150 ℃;
the temperature of the second forging was 975 ℃.
The cooling mode is air cooling.
The properties of the obtained non-quenched and tempered steel are detailed in table 1, the obtained non-quenched and tempered steel is prepared into a spline shaft, a metallographic picture is detailed in fig. 3, and it can be seen from the picture that the metallographic structures are all pearlite plus ferrite structures.
Comparative example 1
The difference from example 1 is only that the non-heat treated steel for shaft parts contains 0.6% by mass of C, and the properties of the obtained non-heat treated steel are specified in table 1.
Comparative example 2
The difference from example 1 is only that the non-heat treated steel for shaft parts contains 0.2% by mass of C, and the properties of the obtained non-heat treated steel are specified in table 1.
Comparative example 3
The difference from example 1 is only that V in the non-heat-treated steel for shaft parts is 0.005% by mass, and the properties of the obtained non-heat-treated steel are specified in table 1.
Comparative example 4
The only difference from example 1 is that the temperature of the first forging was replaced with 1000 c, and the properties of the obtained non heat-treated steel are specified in table 1.
Comparative example 5
The difference from example 1 is only that the first forging is performed, the plastic toughness is drastically decreased to generate anisotropy, and the forging properties cannot be satisfied.
Comparative example 6
The difference from example 1 is only that the second forging alone, the plastic toughness is drastically decreased to generate anisotropy, and the forging properties are not satisfactory.
TABLE 1 Properties of non-heat-treated steels obtained in examples and comparative examples
| Tensile strength/MPa | hardness/HBW | Elongation after break A/%) | Reduction of area Z/%) | |
| Example 1 | 880 | 273 | 15 | 40 |
| Example 2 | 735 | 261 | 17.5 | 42 |
| Example 3 | 992 | 292 | 12 | 31.5 |
| Comparative example 1 | 800 | 275 | 12 | 30 |
| Comparative example 2 | 792 | 246 | 18 | 45 |
| Comparative example 3 | 825 | 265 | 14.5 | 37.5 |
| Comparative example 4 | 746 | 236 | 22.5 | 52 |
From the results of the above examples and comparative examples, it can be seen that the hardness of the conditioned steel is improved by controlling the contents of C, Mn, Cr and V in the composition of the non-quenched and tempered steel and controlling the appropriate carbon equivalent, and the toughness, elongation at break, compressive strength and hardness are remarkably enhanced by employing a specific forging process.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The non-quenched and tempered steel for the shaft parts is characterized by comprising the following components in percentage by mass: 0.3 to 0.5 percent of C, 0.2 to 0.8 percent of Si, 1.4 to 1.6 percent of Mn, less than or equal to 0.03 percent of P, 0.03 to 0.075 percent of S, 0.4 to 0.6 percent of Cr, 0.012 to 0.02 percent of V, less than or equal to 0.2 percent of Mo, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Ni, and the balance of Fe;
wherein the carbon equivalent satisfies Ceq ═ C + (1/7) Si + (1/5) Mn + (1/9) Cr + (1.54) V, and Ceq is 0.75-0.85.
2. The non-quenched and tempered steel for shaft parts as recited in claim 1, wherein the non-quenched and tempered steel for shaft parts comprises the following components in percentage by mass: 0.3 to 0.38 percent of C, 0.22 to 0.36 percent of Si, 1.45 to 1.56 percent of Mn, less than or equal to 0.03 percent of P, 0.037 to 0.055 percent of S, 0.43 to 0.53 percent of Cr, 0.014 to 0.018 percent of V, less than or equal to 0.2 percent of Mo, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Ni, and the balance of Fe.
3. The non heat treated steel for shaft parts according to claim 1 or 2, wherein the microstructure of the non heat treated steel for shaft parts includes pearlite and ferrite.
4. A method for producing a non-heat treated steel for shaft parts according to any one of claims 1 to 3, characterized in that the method comprises: and heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts.
5. The method for preparing non-quenched and tempered steel for shaft parts as claimed in claim 4, wherein the end point temperature of the heating is 1000-1240 ℃.
6. The method for preparing non-quenched and tempered steel for shaft parts as recited in claim 4 or 5, wherein the heating time is 5 to 6 min.
7. The method for preparing non-heat-treated steel for shaft parts as set forth in any one of claims 4 to 6, wherein the temperature of the first forging is 1050 ℃ and 1150 ℃.
8. The method for preparing non-heat-treated steel for shaft parts as set forth in any one of claims 4 to 7, wherein the temperature of the second forging is 925 and 975 ℃.
9. Method for the production of non heat-treated steel for shaft parts according to any one of claims 4 to 8, characterised in that the cooling comprises air cooling and/or air cooling.
10. The method for producing a non-heat treated steel for shaft parts according to any one of claims 4 to 9, characterized in that the production method comprises: heating the steel billet obtained by the formula, and then sequentially carrying out first forging, second forging and cooling to obtain the non-quenched and tempered steel for the shaft parts;
the temperature of the first forging is 1050-1150 ℃;
the temperature of the second forging is 925-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270181.1A CN112522603A (en) | 2020-11-13 | 2020-11-13 | Non-quenched and tempered steel for shaft parts and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270181.1A CN112522603A (en) | 2020-11-13 | 2020-11-13 | Non-quenched and tempered steel for shaft parts and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112522603A true CN112522603A (en) | 2021-03-19 |
Family
ID=74982443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011270181.1A Pending CN112522603A (en) | 2020-11-13 | 2020-11-13 | Non-quenched and tempered steel for shaft parts and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112522603A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104175063A (en) * | 2013-05-28 | 2014-12-03 | 陕西华威锻压有限公司 | All-fiber-texture large-size one-piece flange fan main shaft forging method |
| CN104651753A (en) * | 2014-11-28 | 2015-05-27 | 南京钢铁股份有限公司 | Non-quenched and tempered steel for heavy truck balance shaft and manufacturing method thereof |
| CN106555114A (en) * | 2016-10-19 | 2017-04-05 | 北京科技大学 | The bayesian body controlling means of ferrite+pearlite type non-hardened and tempered steel crankshaft forging |
| CN107475501A (en) * | 2016-06-07 | 2017-12-15 | 江苏恒力制动器制造有限公司 | A kind of Micro Alloying brake camshaft and its manufacture method |
| CN109554618A (en) * | 2017-09-26 | 2019-04-02 | 陕西汽车集团有限责任公司 | Non-hardened and tempered steel and the method that automobile axle shaft is manufactured using non-hardened and tempered steel |
| CN110578096A (en) * | 2019-10-24 | 2019-12-17 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
-
2020
- 2020-11-13 CN CN202011270181.1A patent/CN112522603A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104175063A (en) * | 2013-05-28 | 2014-12-03 | 陕西华威锻压有限公司 | All-fiber-texture large-size one-piece flange fan main shaft forging method |
| CN104651753A (en) * | 2014-11-28 | 2015-05-27 | 南京钢铁股份有限公司 | Non-quenched and tempered steel for heavy truck balance shaft and manufacturing method thereof |
| CN107475501A (en) * | 2016-06-07 | 2017-12-15 | 江苏恒力制动器制造有限公司 | A kind of Micro Alloying brake camshaft and its manufacture method |
| CN106555114A (en) * | 2016-10-19 | 2017-04-05 | 北京科技大学 | The bayesian body controlling means of ferrite+pearlite type non-hardened and tempered steel crankshaft forging |
| CN106555114B (en) * | 2016-10-19 | 2018-03-13 | 北京科技大学 | The bayesian body controlling means of ferrite+pearlite type non-hardened and tempered steel crankshaft forging |
| CN109554618A (en) * | 2017-09-26 | 2019-04-02 | 陕西汽车集团有限责任公司 | Non-hardened and tempered steel and the method that automobile axle shaft is manufactured using non-hardened and tempered steel |
| CN110578096A (en) * | 2019-10-24 | 2019-12-17 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 卢文增等: "锻造用非调质钢的奥氏体形变再结晶的研究", 《安徽工业大学学报(自然科学版)》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3715478B1 (en) | Wire rod for cold heading, processed product using same, and manufacturing method therefor | |
| CN111394558B (en) | Steel belt for automobile hollow stabilizer bar and production method thereof | |
| KR101685489B1 (en) | The Alloy Steel Which Is Used as The High Tough Outer Wheel of Constant Velocity Joint And The Method of The Same | |
| CN102071368A (en) | Medium carbon non-quenched and tempered steel used in low-cost forging | |
| CN103882314A (en) | 42 CrMo steel cold-rolled sheet and its production method | |
| CN105063311A (en) | Processing method for improving surface quality of TRIP steel | |
| CN113564496B (en) | Long-life railway bearing steel and preparation method thereof | |
| JPH05302119A (en) | Production of high strength automotive parts | |
| CN116144909A (en) | Non-quenched and tempered steel motor shaft and preparation method and application thereof | |
| CN112522603A (en) | Non-quenched and tempered steel for shaft parts and preparation method thereof | |
| JPS582243B2 (en) | Manufacturing method for non-thermal forged parts for automobiles | |
| CN105256238A (en) | Low-carbon martensite non-quenched-and-tempered steel for automobile parts and manufacturing method for low-carbon martensite non-quenched-and-tempered steel | |
| CN110284059A (en) | A kind of automobile front suspension lower control arm ontology and preparation method thereof | |
| CN102383036A (en) | Medium carbon alloy steel applicable to forging afterheat quenching | |
| JP2007513259A (en) | Steel wire for cold heading having excellent low temperature impact characteristics and method for producing the same | |
| CN105274443A (en) | Mold forging steel and preparation method thereof | |
| CN114836681B (en) | High-strength seamless steel pipe with good fatigue resistance and manufacturing method thereof | |
| JPH1129842A (en) | Ferrite-pearlite type non-heat treated steel | |
| KR20020034474A (en) | A method for manufacturing non-hteat-treated steel with excellent cold formability | |
| CN113897547A (en) | Cr-Mo-V type medium carbon hot work die steel and tissue spheroidizing method thereof | |
| CN113528948A (en) | Steel for high-plasticity-toughness automobile structural part with tensile strength of 2000MPa produced by CSP and production method | |
| CN113930668A (en) | Steel plate for axle housing with yield strength of 550MPa and preparation method thereof | |
| CN113528947A (en) | Steel for high-plasticity-toughness automobile structural part with tensile strength of 1500MPa produced by CSP and production method | |
| CN113430463A (en) | Medium-carbon boron-containing non-quenched and tempered steel and preparation method thereof | |
| JPH09194999A (en) | Ferrite-pearlite-type non-heat treated steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210319 |
|
| RJ01 | Rejection of invention patent application after publication |