Hot-rolled left-handed anchor rod MG600 and production method thereof

Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to a hot-rolled left-handed anchor rod MG600 and a production method thereof, and the production method comprises the following steps: LD converter smelting, CAS Ca-Si desulfurization, LF ladle refining furnace, CC continuous casting (150 square billets), rolling, finished product inspection and warehousing. The steel bar comprises the following chemical components in percentage by weight: 0.20 to 0.25 percent of C, 0.45 to 0.55 percent of Si, 1.45 to 1.55 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S, 0.10 to 0.15 percent of V and 0.49 to 0.53 percent of Ceq percent, according to the anchor rod MG600 produced through the method, the average yield strength is larger than 660 MPa, the average tensile strength is larger than 820 MPa, the average ductility is larger than 25%, the metallographic structure is pearlite and ferrite, and the grain size reaches the 10-11 level; and the excellent mechanical property not only considers the tensile effect of the anchor rod, but also considers the shear resistance level of the anchor rod, so that the requirements of users on products are completely met.

Description

Technical Field

[0001] The invention belongs to the technical field of steel smelting, and in particular relates to a hot-rolled left-handed anchor rod MG600 and a production method thereof. Background Art

[0002] Tunnel support is a key technology in coal mining. Reasonable, safe and reliable tunnel support technology is a prerequisite for achieving high production and efficiency in mines. Anchor support is an important support technology widely used in coal mines, and high strength, high stiffness and high reliability have become a development trend. At present, high-strength anchor support technology has been widely used at home and abroad, and has achieved huge technical, economic and social benefits. In order to further improve the efficiency of coal mining and the safety of production, the coal industry has put forward the requirement of using 600MPa high-strength and tough resin anchor steel bars. High safety performance, low cost and high strength are the three major goals pursued by low-carbon microalloy mining anchor steel. It is required that the yield strength of high-strength and tough resin anchor MG600 is ≥650MPa, the tensile strength is ≥800MPa, and the elongation is ≥18%; low stress brittle fracture shall not occur during use, and the impact energy AK at room temperature of 20℃ is ≥25J. Generally, with the increase of tensile strength, the elongation decreases, and the increase of strength level is restricted by the demand for plasticity; the decrease of plasticity also leads to an increase in notch sensitivity, and the impact toughness decreases with the increase of tensile strength. Therefore, only by designing reasonable chemical composition and production process can we produce products with low cost and good quality. Summary of the invention

[0003] To achieve the above objectives, the present invention provides a hot-rolled left-handed anchor rod MG600 and a production method thereof, which solves the problems existing in the prior art.

[0004] According to the influence of C, Si and Mn content on performance, the steel composition is reasonably designed. Although silicon and manganese elements can effectively improve the strength of steel, they reduce the plasticity of steel and inhibit the strengthening effect of microalloying elements, which is not conducive to giving full play to the role of microalloying elements and increases the cost of microalloying. Therefore, it is considered to appropriately reduce the content of silicon and manganese elements in steel.

[0005] High-strength anchor steel requires not only very high plasticity, but also good impact absorption energy, and has high requirements for steel purity. As anchor steel for tunnels, low yield ratio is the goal because it requires high safety performance. A trace amount of V alloy can be added to high-strength low-alloy steel to interact with carbon and nitrogen, resulting in grain refinement and precipitation strengthening to obtain ideal organizational properties. Using micro-alloying technology, an appropriate amount of vanadium-iron alloy is added to the steel. The main function of vanadium is to disperse precipitation strengthening in the ferrite zone to avoid its precipitation in austenite, and to make full use of the grain refinement and precipitation strengthening effects of vanadium elements to improve the strength of anchor steel. In the rolling process, the principle of controlled rolling and controlled cooling is used, and the grains are refined by lowering the opening and final rolling temperatures and the controlled cooling process after rolling. Fine grain strengthening can further improve the comprehensive mechanical properties of the product.

[0006] The first technical solution adopted by the present invention is: a hot-rolled left-handed anchor rod MG600, the chemical composition weight percentage of the anchor rod is: C: 0.20-0.25%, Si: 0.45-0.55%, Mn: 1.45-1.55%, P≤0.030%, S≤0.020%, V: 0.10-0.15%, and Ceq% (carbon equivalent) is 0.49-0.53.

[0007] The second technical solution adopted by the present invention is: a production method of hot-rolled left-handed anchor rod MG600, the key steps of which are as follows:

[0008] Step 1: During converter smelting, it is required to add self-produced scrap steel and molten iron. The scrap steel control ratio is 10% to 15%, and the addition ratio of molten iron and pig iron is controlled at 85% to 90%. It is strictly forbidden to use non-standard pig iron. The process adopts reasonable oxygen supply and slag making mode to prevent splashing and slag drying, improve the converter process control and endpoint control capabilities, adopt high-pull supplementary blowing method, and control the carbon content of the first pour between 0.25% and 0.35%, ensuring that the carbon content of the steel is greater than 0.10%, avoiding overoxidation of molten steel, and adopt low gun position operation in the later stage of smelting, strengthen the stirring of the molten pool, ensure the gun pressing time, ensure the uniformity of the composition and temperature of the terminal molten steel, and reduce the oxidizability of the slag;

[0009] Step 2: After the converter is tapped, soft argon blowing is performed. It is strictly forbidden to expose the molten steel. The diameter of the molten steel level fluctuation is controlled at about 20 cm. The refining time of the LF furnace is more than 35 minutes. During the LF refining period, the reducing atmosphere in the refining furnace must be maintained to prevent air inhalation and ensure refining;

[0010] Step 3: Full protection pouring is adopted when pouring molten steel, and the superheat is controlled at 20-35℃; in order to prevent the segregation of the central component of the ingot and ensure the internal quality of the ingot, electromagnetic stirring of the crystallizer and electromagnetic stirring at the end of solidification of the ingot are adopted, the continuous casting speed fluctuation is less than 0.1m / min, and the secondary cooling section adopts gas mist cooling to ensure uniform cooling of the ingot. The ingot is inspected at low magnification, and the central shrinkage cavity is required to be ≤2.0 level.

[0011] Step 4: The rough rolling mill consists of 6 550mm high-rigidity short-stress line rolling mills, which adopt holeless flat roll rolling; the intermediate rolling mill consists of 2 550mm, 2 450mm and 2 400mm high-rigidity short-stress line rolling mills, which adopt ellipse-round hole-ellipse-round hole-ellipse-round hole type alternation; the finishing mill consists of 4 400mm high-rigidity short-stress line rolling mills, which adopt ellipse-round hole-ellipse-round hole type system;

[0012] Step 5: Rolling process: the billet heating temperature is 1070-1120°C, the final rolling temperature is 950°C, and the final rolling speed is 8.5m / s;

[0013] Step 6: The steel in step 5 is slowly cooled on a cooling bed to obtain the left-handed anchor rod MG600.

[0014] Furthermore, in step 1, the pouring temperature is controlled at 1640°C and the tapping temperature is controlled at 1670°C.

[0015] Furthermore, the reasonable oxygen supply and slag-making mode described in step 1 is specifically that the oxygen supply lance position adopts a "high-low-high-low" lance position operation, and the oxygen supply intensity is 3.5-3.6m 3 / (min·t) accelerates the decarburization rate, slag formation rate and molten pool temperature rise rate, and reduces oxygen consumption; adopts single slag method operation, and the slag is added in 3 batches. The first batch of slag is added when blowing starts, and the added amount is 1 / 2 of the total slag amount. The remaining slag is added before 1 / 2 to 2 / 3 of the oxygen supply time.

[0016] Furthermore, in step 2, the soft blowing time of argon is not less than 10 minutes.

[0017] Furthermore, in step 4, in order to meet the special shape requirements of anchor steel bars, the hole type of the finished rolling mill frame was optimized and improved. To ensure the stability of the material shape, a reasonable pressing system was adopted to design a finished hole system with strong rounding ability, and the angle was designed to be 30 degrees.

[0018] Furthermore, the mechanical properties of the anchor MG600 are as follows: the yield strength is greater than 660 MPa on average, the tensile strength is greater than 820 MPa on average, and the elongation is greater than 25% on average.

[0019] Furthermore, the metallographic structure of anchor MG600 is pearlite + ferrite, and the grain size reaches 10-11 levels.

[0020] The beneficial effects of the present invention are:

[0021] (1) Dimensions and quality: The steel bar surface is free of defects and the dimensions are qualified. After being used in Pingdingshan Tianan Mining, it was found that the rolling precision was high, which could reduce the friction coefficient between the nut and the bolt thread section[5], significantly increase the bolt preload torque, and ensure fast and high-quality installation of the bolt.

[0022] (2) The MG600 produced contains very few non-metallic inclusions, and the brittle inclusions are Class A inclusions 0.5, and there are no plastic inclusions; the yield strength of the anchor steel is relatively good, and it has a higher safety. In the cold bending performance test, after bending 180° with a 90mm bending core diameter, no cracks were generated on the surface of the bent part, and the cold bending performance was good. The excellent mechanical properties not only take into account the tensile effect of the anchor, but also take into account the shear resistance level of the anchor, which fully meets the user's requirements for the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a low-magnification inspection picture of the anchor MG600 produced in Example 1;

[0025] Figure 2 This is a low-magnification inspection picture of the anchor MG600 produced in Example 2;

[0026] Figure 3 Comparison chart of hole design;

[0027] Figure 4 This is a diagram of non-metallic inclusions in the anchor bolt MG600 actually produced in Example 1;

[0028] Figure 5 The metallographic structure diagram is 100 times that of the anchor MG600 actually produced in Example 1;

[0029] Figure 6 It is a 500-fold metallographic structure diagram of the anchor MG600 actually produced in Example 1. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a hot-rolled left-handed anchor rod MG600, wherein the chemical composition weight percentage of the anchor rod is: C: 0.20-0.25%, Si: 0.45-0.55%, Mn: 1.45-1.55%, P≤0.030%, S≤0.020%, V: 0.10-0.15%, and Ceq% (carbon equivalent) is 0.49-0.53.

[0032] A production method of hot-rolled left-handed anchor rod MG600, the key steps are as follows:

[0033] Step 1: When smelting in the converter, it is required to add self-produced scrap steel and molten iron. The scrap steel ratio is controlled at 10% to 15%, and the molten iron and pig iron ratio is controlled at 85% to 90%. It is strictly forbidden to use non-standard pig iron. The oxygen supply gun position adopts the "high-low-high-low" gun position operation, and the oxygen supply intensity is 3.5 to 3.6m 3 / (min·t) Accelerate the decarburization speed, slag formation speed and molten pool heating speed, reduce oxygen consumption; adopt single slag method operation, slag is added in 3 batches, the first batch of slag is added when blowing starts, the addition amount is 1 / 2 of the total slag, and the remaining slag is added before 1 / 2 to 2 / 3 of the oxygen supply time. Eliminate splashing and slag drying. Improve the process control and end point control capabilities of the converter, adopt high-pull supplementary blowing, control the carbon content of the first pour between 0.25% and 0.35%, ensure that the carbon content of the steel is greater than 0.10%, and avoid overoxidation of the molten steel. Temperature control, the first pour temperature is controlled at 1640℃, and the steel tapping temperature is controlled at about 1670℃. In the later stage of smelting, low gun position operation is adopted to strengthen the stirring of the molten pool, ensure the gun pressure time, ensure the uniformity of the composition and temperature of the terminal molten steel, and reduce the oxidizability of the slag.

[0034] Step 2: After the converter is tapped, soft argon blowing is performed. It is strictly forbidden to expose the molten steel. The diameter of the molten steel level fluctuation is controlled at about 20cm, and the soft argon blowing time is not less than 10 minutes. Ensure that the refining time of the LF furnace is more than 35 minutes. During the LF refining period, the reducing atmosphere in the refining furnace must be maintained to prevent air inhalation and ensure refining.

[0035] Step 3: Full protection pouring is adopted when pouring molten steel, and the superheat is controlled at 20-35℃; in order to prevent the central component segregation of the ingot and ensure the internal quality of the ingot, electromagnetic stirring of the crystallizer and electromagnetic stirring at the end of solidification of the ingot are adopted. The continuous casting speed fluctuation is less than 0.1m / min, and the secondary cooling section adopts gas mist cooling to ensure uniform cooling of the ingot. The ingot is inspected at low magnification, and the central shrinkage cavity is required to be ≤2.0 level.

[0036] Step 4: The rough rolling unit consists of 6 550mm high-rigidity short-stress line rolling mills, which adopt hole-free flat roll rolling. The intermediate rolling unit consists of 2 550mm, 2 450mm and 2 400mm high-rigidity short-stress line rolling mills, which adopt the ellipse-round hole-ellipse-round hole-ellipse-round hole type alternately. The finishing rolling unit consists of 4 400mm high-rigidity short-stress line rolling mills, which adopt the ellipse-round hole-ellipse-round hole type system. In order to meet the special appearance requirements of anchor steel bars, the hole type of the finishing rolling finished product frame was optimized and improved. Anchor steel has relatively high dimensional requirements, and the accuracy requirements are more stringent than the national standard tolerance group. Conventional hole types cannot meet the requirements of anchor production. We use the iterative method to obtain a reasonable pressure distribution and a reasonable hole size. In order to ensure the stability of the material type, a reasonable pressure reduction system is adopted, and a finished product hole type system with strong roundness capability is designed. The hole type comparison is as follows Figure 3 As shown in the figure, the included angle is improved from 15.2 to 30.

[0037] Step 5: The heating temperature affects the original austenite grain size before rolling. The rolling temperature of each pass and the final rolling temperature also directly affect the degree of austenite recrystallization and grain size after rolling. Under the condition of a certain pass type, the speed of rolling will affect the coarseness and fineness of the grains after rolling. The billet heating temperature is designed to be 1070-1120℃, and the final rolling temperature is 950℃. Since there is no controlled cooling water tank between rough and medium rolling, according to actual measurements, the required final rolling temperature can be guaranteed when the final rolling speed is 8.5m / s. If necessary, a weak water penetration process can be used before final rolling to reduce the final rolling temperature to a suitable range.

[0038] Step 6: The steel in step 5 is slowly cooled on a cooling bed to obtain the left-handed anchor rod MG600.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

[0040] The present invention is described in detail below with reference to the embodiments.

[0041] Embodiment 1:

[0042] The chemical composition weight percentages of this embodiment are: C: 0.24%, Si: 0.51%, Mn: 1.51%, P: 0.014%, S: 0.007%, V: 0.12%, and Ceq% (carbon equivalent) is 0.53, as shown in Table 1.

[0043] The key production steps are as follows:

[0044] Step 1: Self-produced scrap steel and molten iron are required to be added during converter smelting. The scrap steel control ratio is 10% to 15%, and the molten iron and pig iron addition ratio is controlled at 85% to 90%. It is strictly forbidden to use non-standard pig iron. The process adopts a reasonable oxygen supply and slag making mode to prevent splashing and slag drying. Improve the converter process control and end point control capabilities, adopt high-pull supplementary blowing, control the carbon content of the first pour between 0.25% and 0.35%, ensure that the carbon content of the steel is greater than 0.10%, and avoid overoxidation of the molten steel. Temperature control, the first pour temperature is controlled at 1640℃, and the steel tapping temperature is controlled at about 1670℃. In the later stage of smelting, low gun position operation is adopted to strengthen the stirring of the molten pool, ensure the gun pressing time, ensure the uniformity of the end point molten steel composition and temperature, and reduce the oxidizability of the slag.

[0045] Step 2: After the converter is tapped, soft argon blowing is performed. It is strictly forbidden to expose the molten steel. The diameter of the molten steel level fluctuation is controlled at about 20cm, and the soft argon blowing time is not less than 10 minutes. Ensure that the refining time of the LF furnace is more than 35 minutes. During the LF refining period, the reducing atmosphere in the refining furnace must be maintained to prevent air inhalation and ensure refining.

[0046] Step 3: When pouring molten steel, full protection pouring is adopted, and the superheat is controlled at 20-35℃; in order to prevent the segregation of the center component of the ingot and ensure the internal quality of the ingot, electromagnetic stirring of the crystallizer and electromagnetic stirring at the end of solidification of the ingot are adopted. The continuous casting speed fluctuation is less than 0.1m / min, and the secondary cooling section adopts gas mist cooling to ensure uniform cooling of the ingot. The ingot is subjected to low-power inspection, and the central shrinkage cavity is required to be ≤2.0. The low-power inspection of MG600 is shown in Figure 1 .

[0047] Step 4: The rough rolling mill consists of 6 550mm high-rigidity short-stress line rolling mills, which adopt hole-free flat roll rolling. The intermediate rolling mill consists of 2 550mm, 2 450mm and 2 400mm high-rigidity short-stress line rolling mills, which adopt ellipse-round hole-ellipse-round hole-ellipse-round hole type alternation. The finishing mill consists of 4 400mm high-rigidity short-stress line rolling mills, which adopt ellipse-round hole-ellipse-round hole type system. In order to meet the special shape requirements of anchor steel bars, the hole type of the finishing finished product frame is optimized and improved. Anchor steel has relatively high requirements for size, which is more demanding than the national standard tolerance group. Conventional hole types cannot meet the requirements of anchor production. We use the iteration method to obtain a reasonable pressure distribution and a reasonable hole size. In order to ensure the stability of the material type, a reasonable pressure reduction system is adopted, and a finished hole system with strong rounding ability is designed, and the angle is improved from the previous 15.2 to 30.

[0048] Step 5: The heating temperature affects the original austenite grain size before rolling. The rolling temperature of each pass and the final rolling temperature also directly affect the degree of austenite recrystallization and grain size after rolling. Under the condition of a certain pass type, the speed of rolling will affect the coarseness and fineness of the grains after rolling. The billet heating temperature is designed to be 1070-1120℃, and the final rolling temperature is 950℃. Since there is no controlled cooling water tank between rough and medium rolling, according to actual measurements, the required final rolling temperature can be guaranteed when the final rolling speed is 8.5m / s. If necessary, a weak water penetration process can be used before final rolling to reduce the final rolling temperature to a suitable range.

[0049] Step 6: The steel in step 5 is slowly cooled on a cooling bed to obtain the left-handed anchor rod MG600.

[0050] The anchor MG600 contains very few non-metallic inclusions, such as Figure 4 As shown, the brittle inclusions are Class A inclusions 0.5, and there are no plastic inclusions.

[0051] The metallographic structure of anchor MG600 is pearlite + ferrite, and the grain size reaches 10-11 levels. Figure 5 and Figure 6 shown.

[0052] Embodiment 2:

[0053] The chemical composition weight percentages of this embodiment are: C: 0.24%, Si: 0.52%, Mn: 1.52%, P: 0.013%, S: 0.010%, V: 0.13%, and Ceq% (carbon equivalent) is 0.53, as shown in Table 1.

[0054] The key production steps are the same as in Example 1. The low-power inspection of MG600 is shown in Figure 2 .

[0055] Embodiment 3:

[0056] The chemical composition weight percentages of this embodiment are: C: 0.23%, Si: 0.51%, Mn: 1.52%, P: 0.014%, S: 0.010%, V: 0.13%, and Ceq% (carbon equivalent) is 0.52, as shown in Table 1.

[0057] The key production steps are the same as in Example 1.

[0058] Table 1 MG600 chemical composition control

[0059]

[0060] The mechanical properties test results of the anchor rod MG600 produced in Examples 1, 2 and 3 are shown in Table 2.

[0061] Table 2 Mechanical properties of MG600

[0062]

[0063] As can be seen from Table 2, the yield strength of the steel bars is greater than 660MPa on average, the tensile strength is greater than 820MPa on average, and the elongation is greater than 25% on average. The yield strength of the anchor steel is relatively good, and it has a higher safety. In the cold bending performance test, after bending 180° with a 90mm bending core diameter, no cracks were generated on the surface of the bent part, and the cold bending performance was good. The excellent mechanical properties not only take into account the tensile effect of the anchor rod, but also take into account the shear resistance level of the anchor rod, which fully meets the user's requirements for the product. MG600 meets the design indicators of high-strength and tough anchor rod steel bars. After the anchor rod steel bars are processed into resin anchor rods, they are inspected and qualified at the Material Testing Center of Pingmei Group Co., Ltd. The product quality meets the user's requirements and has begun to be used in batches of more than 20,000 tons.

[0064] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot-rolled left-handed anchor rod MG600, characterized in that: The chemical composition of the anchor rod is as follows by weight: C: 0.20-0.25%, Si: 0.45-0.55%, Mn: 1.45-1.55%, P≤0.030%, S≤0.020%, V: 0.10-0.15%, and Ceq% carbon equivalent is 0.49-0.

53.

2. The method for producing hot-rolled left-handed anchor rod MG600 according to claim 1, characterized in that: The key process steps include: Step 1: Scrap steel and molten iron are added during converter smelting, with the scrap steel ratio being 10% to 15%, and the molten iron and pig iron addition ratio being controlled at 85% to 90%. It is strictly forbidden to use non-standard pig iron, and a reasonable oxygen supply and slag making mode is adopted to prevent splashing and slag drying, and improve the converter process control and endpoint control capabilities; a high-pull supplementary blowing method is adopted, and the carbon content of the first pour is controlled between 0.25% and 0.35%, ensuring that the carbon content of the steel is greater than 0.10%, avoiding overoxidation of the molten steel, and a low gun position operation is adopted in the later stage of smelting to strengthen the stirring of the molten pool; Step 2: After the converter is tapped, soft argon blowing is performed. The molten steel is strictly prohibited from being exposed. The diameter of the molten steel level fluctuation is controlled at about 20 cm. The refining time of the LF furnace is more than 35 minutes. Step 3: The molten steel is poured with full protection, the superheat is controlled at 20-35℃, the crystallizer is electromagnetically stirred and the solidification end of the ingot is electromagnetically stirred, the continuous casting speed fluctuation is less than 0.1m / min, the secondary cooling section adopts gas mist cooling, the ingot is inspected at low magnification, and the central shrinkage cavity is required to be ≤2.0 level; Step 4: The rough rolling mill consists of 6 550mm high-rigidity short-stress line rolling mills, which adopt holeless flat roll rolling; the intermediate rolling mill consists of 2 550mm, 2 450mm and 2 400mm high-rigidity short-stress line rolling mills, which adopt ellipse-round hole-ellipse-round hole-ellipse-round hole type alternation; the finishing mill consists of 4 400mm high-rigidity short-stress line rolling mills, which adopt ellipse-round hole-ellipse-round hole type system; Step 6: Place the steel in step 5 on a cooling bed for slow cooling to obtain the left-handed anchor rod MG600.

3. The method for producing hot-rolled left-handed anchor rod MG600 according to claim 2, characterized in that: In step 1, the first pouring temperature is controlled at 1640°C and the tapping temperature is controlled at 1670°C.

4. The method for producing hot-rolled left-handed anchor rod MG600 according to claim 2, characterized in that: The reasonable oxygen supply and slag-making mode described in step 1 is that the oxygen supply lance adopts the "high-low-high-low" lance position operation, and the oxygen supply intensity is 3.5-3.6m 3 / (min·t) accelerates the decarburization rate, slag formation rate and molten pool temperature rise rate, and reduces oxygen consumption; adopts single slag method operation, and the slag is added in 3 batches. The first batch of slag is added when blowing starts, and the added amount is 1 / 2 of the total slag amount. The remaining slag is added before 1 / 2 to 2 / 3 of the oxygen supply time.

5. The method for producing hot-rolled left-handed anchor rod MG600 according to claim 2, characterized in that: The soft argon blowing time in step 2 is not less than 10 minutes.

6. The method for producing hot-rolled left-handed anchor rod MG600 according to claim 2, characterized in that: In step 4, the hole angle of the finishing rolling product stand is 30 degrees.

7. A method for producing hot-rolled left-handed anchor rod MG600 according to any one of claims 3 to 6, characterized in that: The mechanical properties of anchor MG600 are as follows: the average yield strength is greater than 660MPa, the average tensile strength is greater than 820MPa, and the average elongation is greater than 25%.

8. A method for producing hot-rolled left-handed anchor rod MG600 according to any one of claims 3 to 6, characterized in that: The metallographic structure of anchor MG600 is pearlite + ferrite, and the grain size reaches level 10 to 11.

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