CN112195394A - MG600 grade anchor rod steel with yield ratio less than or equal to 0.8 and production method thereof - Google Patents
MG600 grade anchor rod steel with yield ratio less than or equal to 0.8 and production method thereof Download PDFInfo
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- CN112195394A CN112195394A CN202010904095.5A CN202010904095A CN112195394A CN 112195394 A CN112195394 A CN 112195394A CN 202010904095 A CN202010904095 A CN 202010904095A CN 112195394 A CN112195394 A CN 112195394A
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The invention discloses MG600 grade anchor rod steel with a yield ratio less than or equal to 0.8 and a production method thereof, and the production method comprises the following steps: molten iron desulfurization, converter smelting, continuous casting and hot rolling; the hot rolling is specifically billet heating, rough rolling, medium rolling, finish rolling, controlled cooling, air cooling of a cooling bed and stacking slow cooling; the steel bar comprises the following components in percentage by mass: c: 0.25 to 0.30%, Si: 0.50 to 0.65%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.035%, P: less than or equal to 0.035%, and the balance of Fe and inevitable impurities. The anchor rod steel produced by the method has yield strength of more than 600MPa, tensile strength of more than 800MPa, yield ratio of less than or equal to 0.8, impact absorption energy of more than 50J at 20 ℃, uniform ferrite and pearlite structure, stable steel performance and good use effect.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy and steel rolling, and particularly relates to MG600 grade anchor rod steel with a yield ratio of less than or equal to 0.8, and a production method of the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
Background
At present, the anchor rod steel mainly has MG335 and MG400 grades, and the application of the anchor rod steel of MG500 and MG600 grades is gradually wide, and along with the increase of the mining depth of a mine, the requirement on the performance of the anchor rod steel is higher, and the development of the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 has very important practical significance.
Meanwhile, the development of the high-strength steel bars and the further improvement of the standards and the application of the high-strength steel bars are important measures for building resource-saving and environment-friendly society, and have important significance for promoting the structure adjustment and transformation upgrading of the steel industry and the building industry.
Disclosure of Invention
The invention mainly aims to provide MG600 grade anchor rod steel with the yield ratio not more than 0.8, which meets the requirement that the yield ratio not more than 0.8, has the impact absorption energy (KV2) at 20 ℃ of more than 50J, has uniform ferrite and pearlite tissues, and has stable steel performance and good use effect.
The invention also aims to provide a production method of the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8.
The first technical scheme adopted by the invention is that the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 comprises the following components in percentage by mass: c: 0.24 to 0.28%, Si: 0.60 to 0.75%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.030 percent, P: less than or equal to 0.030 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percent of the components is 100 percent.
The second technical scheme adopted by the invention is that the production method of the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 comprises the following specific steps:
step 1, weighing the following components in percentage by weight: c: 0.24 to 0.28%, Si: 0.60 to 0.75%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.030 percent, P: less than or equal to 0.030 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percent of the components is 100 percent;
step 2, melting the raw materials weighed in the step 1 into molten steel and casting a steel billet;
step 3, directly heating the steel billet in the step 2 by hot conveying or heating the steel billet after stacking and cooling;
step 4, carrying out rough rolling, intermediate rolling and finish rolling on the heated steel billet in sequence to obtain a finished product steel;
and 5, naturally cooling the steel subjected to the preliminary control cooling in the step 4 to room temperature to obtain the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
The present invention is also characterized in that,
and 2, controlling the tundish temperature to be 1528-1548 ℃, the superheat degree to be 25-45 ℃ and the continuous casting blank drawing speed to be 3 m/min.
Step 3, setting the heating temperature as follows: the preheating section is 950-1050 ℃, the heating section is 1150-1200 ℃, and the soaking section is 1160-1200 ℃; the heating time is controlled to be 120-160 min.
And 4, rough rolling is carried out, the initial rolling temperature is controlled to be 1100-1120 ℃, the finish rolling temperature is controlled to be 1060-1090 ℃, cooling is carried out after rolling, and the temperature of an upper cooling bed is controlled to be 950-1030 ℃.
The content of each element is selected according to the following formula:
c: in a hypoeutectoid range, the tensile strength is continuously improved along with the increase of the content of C, and in order to improve the performance of MG 500-grade anchor rod steel, the components are controlled within the range of 0.24-0.28%.
Si: si is a beneficial element in steel and can improve the strength index of the steel, but when the content of Si exceeds 0.8%, the surface shrinkage rate of the steel is reduced, and the impact toughness is obviously reduced. Therefore, the Si content is controlled to be in the range of 0.60 to 0.75%.
Mn: mn is dissolved in ferrite to cause solid solution strengthening, so that relatively fine pearlite with high strength is obtained when the steel is cooled after rolling, and the hardness and the strength of the steel after hot rolling can be improved. Therefore, the content of Mn is controlled to be in the range of 1.45 to 1.60%.
V: v and C form carbide, which has the function of strongly preventing austenite grains from growing, can refine grains and improve the strength and toughness of steel. Controlling the content of V within the range of 0.070-0.120%.
S, P: the segregation of S is serious, and the biggest harm is to cause hot brittleness; p is also highly segregated, and although it improves the strength of steel, it decreases ductility and toughness, increases cold brittleness of steel, and is a harmful element. Therefore, the lower the S, P content control, the better, the comprehensive consideration, the control S, P content in 0.030%.
Nb: carbide or nitride formed by Nb has the function of strongly preventing austenite grains from growing, so that a proper amount of niobium is added into the steel to have the functions of refining the grains and inhibiting the austenite from increasing, and the content of the niobium is comprehensively considered to be controlled within the range of 0.010-0.020%.
The invention has the beneficial effects that: the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 is produced by adopting the component preparation standard, the yield strength of the steel reaches more than 600MPa, the tensile strength reaches more than 800MPa, the requirement that the yield ratio is less than or equal to 0.8 is met, the impact absorption energy (KV2) at 20 ℃ is more than 50J, the structure is uniform ferrite and pearlite, the steel performance is stable, and the using effect is good.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention provides MG600 grade anchor rod steel with a yield ratio less than or equal to 0.8, which comprises the following components in percentage by mass: c: 0.24 to 0.28%, Si: 0.60 to 0.75%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.030 percent, P: less than or equal to 0.030 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percent of the components is 100 percent.
A preparation process of MG600 grade anchor rod steel with a yield ratio less than or equal to 0.8 comprises the following operation steps:
step 1, weighing the following components in percentage by weight: c: 0.25 to 0.30%, Si: 0.50 to 0.65%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.035%, P: less than or equal to 0.035%, the balance of Fe and inevitable impurities, the sum of the weight percentages of the components is 100%;
step 2, melting the raw materials weighed in the step 1 into molten steel and casting a steel billet;
controlling the temperature of a casting blank tundish to be 1528-1548 ℃, the superheat degree to be 25-45 ℃ and the casting blank drawing speed to be 3 m/min;
step 3, directly heating the steel billet in the step 2 by hot conveying or heating the steel billet after stacking and cooling;
the heating temperature was set as: the preheating section is 950-1050 ℃, the heating section is 1150-1200 ℃, and the soaking section is 1160-1200 ℃; the heating time is controlled to be 120-160 min;
step 4, carrying out rough rolling, intermediate rolling and finish rolling on the heated steel billet in sequence to obtain a finished product steel;
controlling the initial rolling temperature of rough rolling to be 1100-1120 ℃, controlling the finish rolling temperature to be 1060-1090 ℃, controlling cooling after rolling, and controlling the temperature of an upper cooling bed to be 950-1030 ℃;
and 5, naturally cooling the steel subjected to the preliminary control cooling in the step 4 to room temperature to obtain the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
The present invention will be described in detail with reference to examples.
Example 1
Step 1, weighing the following components in percentage by weight: c: 0.24%, Si: 0.60%, Mn: 1.45%, V: 0.100%, Nb: 0.010%, S: 0.030%, P: 0.030 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percentages of the components is 100 percent;
step 2, melting the raw materials weighed in the step 1 into molten steel and casting a steel billet;
controlling the temperature of a casting blank in the tundish to be 1528 ℃, the superheat degree to be 25 ℃ and the casting speed of the continuous casting blank to be 3 m/min;
step 3, directly heating the steel billet in the step 2 by hot conveying or heating the steel billet after stacking and cooling;
the heating temperature was set as: the preheating section is 950 ℃, the heating section is 1200 ℃ and the soaking section is 1200 ℃; the heating time is controlled to be 120 min;
step 4, carrying out rough rolling, intermediate rolling and finish rolling on the heated steel billet in sequence to obtain a finished product steel;
controlling the initial rolling temperature of rough rolling to be 1120 ℃, controlling the finish rolling temperature to be 1060 ℃, controlling cooling after rolling, and controlling the temperature of an upper cooling bed to be 1030 ℃;
and 5, naturally cooling the steel subjected to the preliminary control cooling in the step 4 to room temperature to obtain the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
Example 2
Step 1, weighing the following components in percentage by weight: c: 0.28%, Si: 0.75%, Mn: 1.60%, V: 0.120%, Nb: 0.020%, S: 0.02%, P: 0.025 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percentages of the components is 100 percent;
step 2, melting the raw materials weighed in the step 1 into molten steel and casting a steel billet;
controlling the temperature of a casting blank in a tundish to be 1548 ℃, controlling the superheat degree to be 45 ℃, and controlling the casting blank drawing speed to be 3 m/min;
step 3, directly heating the steel billet in the step 2 by hot conveying or heating the steel billet after stacking and cooling;
the heating temperature was set as: a preheating section 1050 ℃, a heating section 1150 ℃ and a soaking section 1160 ℃; the heating time is controlled at 160 min;
step 4, carrying out rough rolling, intermediate rolling and finish rolling on the heated steel billet in sequence to obtain a finished product steel;
controlling the initial rolling temperature of rough rolling at 1100 ℃, controlling the finish rolling temperature at 1090 ℃, controlling cooling after rolling, and controlling the temperature of an upper cooling bed at 950 ℃;
and 5, naturally cooling the steel subjected to the preliminary control cooling in the step 4 to room temperature to obtain the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
Example 3
Step 1, weighing the following components in percentage by weight: c: 0.26%, Si: 0.7%, Mn: 1.5%, V: 0.070%, Nb: 0.015%, S: 0.02%, P: less than or equal to 0.01 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percentages of the components is 100 percent;
step 2, melting the raw materials weighed in the step 1 into molten steel and casting a steel billet;
controlling the temperature of a casting blank tundish to be 1530 ℃, the superheat degree to be 35 ℃ and the casting blank drawing speed to be 3 m/min;
step 3, directly heating the steel billet in the step 2 by hot conveying or heating the steel billet after stacking and cooling;
the heating temperature was set as: the preheating section is 1000 ℃, the heating section is 1160 ℃, and the soaking section is 1180 ℃; the heating time is controlled to be 120-160 min;
step 4, carrying out rough rolling, intermediate rolling and finish rolling on the heated steel billet in sequence to obtain a finished product steel;
controlling the initial rolling temperature of rough rolling at 1110 ℃, controlling the finish rolling temperature at 1080 ℃, controlling cooling after rolling, and controlling the temperature of an upper cooling bed at 1000 ℃;
and 5, naturally cooling the steel subjected to the preliminary control cooling in the step 4 to room temperature to obtain the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
The steel bar produced by the method has low cost and high strength, adopts components similar to 500 MPa-level screw steel, and adds a proper amount of Nb alloy to produce the anchor rod steel with yield strength higher than 600MPa, and the grain size reaches over 9.5.
The phi 22mm anchor rod steel produced in the examples 1, 2 and 3 has the chemical composition controlled according to the above requirements, and the continuous casting and rolling processes perform the above requirements.
The properties of the steels are given in the following Table
As is apparent from examples 1, 2 and 3, the yield strength and the yield ratio of the steel bar prepared by the method meet the requirements of MG 600-grade steel.
Claims (5)
1. The MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 is characterized by comprising the following components in percentage by mass: c: 0.24 to 0.28%, Si: 0.60 to 0.75%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.030 percent, P: less than or equal to 0.030 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percent of the components is 100 percent.
2. A production method of MG600 grade anchor rod steel with a yield ratio less than or equal to 0.8 is characterized by comprising the following specific operation steps:
step 1, weighing the following components in percentage by weight: c: 0.24 to 0.28%, Si: 0.60 to 0.75%, Mn: 1.45-1.60%, V: 0.070-0.120%, Nb: 0.010-0.020%, S: less than or equal to 0.030 percent, P: less than or equal to 0.030 percent, and the balance of Fe and inevitable impurities, wherein the sum of the weight percent of the components is 100 percent;
step 2, melting the raw materials weighed in the step 1 into molten steel and casting a steel billet;
step 3, directly heating the steel billet in the step 2 by hot conveying or heating the steel billet after stacking and cooling;
step 4, carrying out rough rolling, intermediate rolling and finish rolling on the heated steel billet in sequence to obtain a finished product steel;
and 5, naturally cooling the steel subjected to the preliminary control cooling in the step 4 to room temperature to obtain the MG600 grade anchor rod steel with the yield ratio of less than or equal to 0.8.
3. The production method of the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 according to claim 2, characterized in that the casting blank control in the step 2 controls the tundish temperature to be 1528-1548 ℃, the superheat degree to be 25-45 ℃ and the continuous casting blank drawing speed to be 3 m/min.
4. The method for producing the MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 of claim 2, wherein the heating temperature in the step 3 is set as follows: the preheating section is 950-1050 ℃, the heating section is 1150-1200 ℃, and the soaking section is 1160-1200 ℃; the heating time is controlled to be 120-160 min.
5. The production method of MG600 grade anchor rod steel with the yield ratio less than or equal to 0.8 of claim 2, characterized in that the rough rolling in the step 4 controls the initial rolling temperature at 1100-1120 ℃, the finish rolling temperature at 1060-1090 ℃, the cooling after rolling is controlled, and the temperature of an upper cooling bed is controlled at 950-1030 ℃.
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Cited By (1)
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| CN112195394B (en) | 2022-02-18 |
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