Method for predicting the effect of rolling speed on phosphorus content during cold rolling of phosphorus-containing steel

Abstract

The present application relates to a kind of phosphorus-containing steel phosphorus content cold rolling process the influence prediction method of rolling speed, the method includes the following steps: A) set phosphorus-containing steel rolling parameter, B) solve the equivalent carbon content of phosphorus-containing steel, C) solve the actual deformation resistance of phosphorus-containing steel, D) let with R calculate initial rolling force P: E) with rolling force P calculate R ': F) with R'calculate P ': G) judge |R-R'|≤Δ, if |R-R'|≤Δ then jump to H), if |R-R'|>Δ then let P=P', R=R' and jump to E).H) calculate front slip value f s ,I) calculate rolling moment M, J) calculate the rolling speed v of phosphorus-containing steel.The present application can be according to the field production of cold-rolled strip, fully combine the equipment characteristics of five-stand six-roll cold continuous rolling mill group, calculate the actual deformation resistance, calculate the rolling force of phosphorus-containing steel at a certain reduction, finally under the condition of giving certain rolling power, the rolling speed is obtained using the calculated rolling force, i.e. realize the influence prediction of phosphorus content on rolling speed in the cold rolling process of phosphorus-containing steel.

Description

Technical Field

[0001] This invention relates to the field of rolling speed control in cold rolling mills during the rolling of phosphorus-containing steel, and particularly to a method suitable for predicting the impact of phosphorus content on rolling speed during the cold rolling of phosphorus-containing steel. Background Technology

[0002] In recent years, with the continuous development of modern manufacturing technology, phosphorus has begun to be added to automotive steel as a strengthening element to improve its strength. Studies have found that the phosphorus content in phosphorus-containing steel alters its strength, hardness, and elongation, with increased strength and hardness affecting the rolling speed. In actual production, predicting the rolling speed can improve production efficiency and reduce energy consumption and labor costs, which is of significant economic importance to enterprises. Therefore, to improve the quality and production stability of cold-rolled phosphorus-containing steel products, it is essential to fully consider the actual production conditions at the cold rolling site and the characteristics of the rolling mill to develop a method for predicting the impact of phosphorus content on rolling speed during the cold rolling process of phosphorus-containing steel.

[0003] Comparison of existing technologies

[0004] Invention Patent: Production Process of Phosphorus-Added High-Strength Interstitial Steel (Application No.: CN201610548905.1). This invention discloses a production process for phosphorus-added high-strength interstitial steel, which includes hot metal desulfurization, converter smelting, RH vacuum treatment, and conventional slab continuous casting. This method uses converters with a nominal capacity of less than 110t to produce phosphorus-added high-strength interstitial steel. By controlling the direct tapping of steel from the converter without tilting it, reducing the temperature drop from the converter to the ladle, and employing vacuum mechanical pumps to quickly, accurately, and stably control carbon content, stabilize the production rhythm, and maintain a constant casting speed, this method produces continuously cast slabs that meet requirements and are free of defects. High-quality hot-rolled coils are then produced, and finally, high-quality continuously annealed products are produced through cold rolling. This method controls the process parameters of each step to produce continuously cast slabs that meet requirements and are free of defects, hot-rolled coils, and finally, high-quality continuously annealed products.

[0005] Invention Patent: A Method for Improving the Favorable Texture of High-Strength Phosphorus-Containing IF Steel During Rolling with Rare Earth Treatment (Application No.: CN202010419367.2). This invention discloses a method for improving the favorable texture of high-strength phosphorus-containing IF steel during rolling with rare earth treatment, comprising: at the end of the RH refining process, adding Mn iron, Ti iron, Nb iron, and boron iron during RH vacuum treatment for alloying; adding rare earth cerium iron alloy after 3 minutes of cycling after alloying to achieve a Ce content of 20 ppm in the molten steel; polishing the rolling process samples and comparing and analyzing the content and strength of the favorable texture using XRD. The purpose of this invention is to provide a method for improving the favorable texture of high-strength phosphorus-containing IF steel during rolling with rare earth treatment. Adding rare earth Ce to the steel effectively increases the solid solution content of P element in the steel, improves the solid solution strengthening effect of P element in high-strength IF steel, and obtains a larger proportion of the {111} favorable texture, thereby improving the forming performance index r90 value and giving high-strength phosphorus-containing IF steel better stamping performance.

[0006] Paper: Gu Tie, Hu Shaoxin, Tao Jiawei. Study on mechanical properties of phosphorus-containing medium carbon steel [J]. Modern Metallurgy, 2018, 46(05): 1-4. This paper studies the effects of different phosphorus contents and grain sizes on the mechanical properties of medium carbon steel, focusing on the effects on yield strength, impact toughness, and ductile-brittle transition temperature. The results show that phosphorus dissolves in ferrite, which significantly improves the strength of the steel. Phosphorus tends to agglomerate at the ferrite grain boundaries, increasing the ductile-brittle transition temperature of the steel, and the coarser the grains, the greater the agglomeration. Refining the grains can reduce the agglomeration of phosphorus at the grain boundaries, thereby improving the strength and impact toughness of the steel and reducing the ductile-brittle transition temperature. Therefore, refining the grains can effectively compensate for the toughness loss of phosphorus-containing steel. Summary of the Invention

[0007] This invention fully integrates the equipment characteristics of a five-stand, six-roll cold continuous rolling mill. By performing data regression on a large amount of field data, a formula for calculating the carbon equivalent of phosphorus-containing steel grades is obtained. Using the phosphorus content of phosphorus-containing steel as the input variable, the equivalent carbon of phosphorus-containing steel is calculated, thereby calculating its actual deformation resistance. The rolling force of phosphorus-containing steel at a certain reduction is calculated, and finally, under the condition of a certain rolling power, the rolling speed is obtained by using the calculated rolling force.

[0008] The method for predicting the impact of phosphorus content on rolling speed during the cold rolling of phosphorus-containing steel, as described in this invention, is based on the equipment characteristics of a five-stand, six-roll cold continuous rolling mill. It calculates the cold rolling speed by substituting the phosphorus content of the phosphorus-containing steel, thus achieving the prediction of the impact of phosphorus content on rolling speed. The specific technical solution is as follows:

[0009] A) Set the rolling parameters for phosphorus-containing steel, mainly including: carbon content c, phosphorus content, and other element content (based on the actual carbon equivalent calculation formula); carbon equivalent ratio coefficient η; strip entry thickness H of the i-th stand; strip exit thickness h of the i-th stand; target deformation resistance σ of the i-th stand. i The unit tension σ at the front of the i-th frame 前 The unit tension σ behind the i-th frame 后 ;Incoming material width B; Diameter of the working roll of the i-th frame D; Friction coefficient of the i-th frame μ; Elastic modulus E; Poisson's ratio ν; Iteration parameter Δ; Rolling power W; Motor efficiency η.

[0010] Set the formula C for calculating the actual carbon equivalent of specific phosphorus-containing steel grades. ac The formula is directly derived from regression analysis of a large amount of actual field data.

[0011]

[0012] Where: c—carbon content (%) in phosphorus-containing steel;

[0013] ω (Mn) —Manganese content (%) in phosphorus-containing steel;

[0014] ω (P) —Phosphorus content (%) in phosphorus-containing steel;

[0015] ω (B) —Boron content (%) in phosphorus-containing steel;

[0016] ω (Sn) —Tin content (%) in phosphorus-containing steel;

[0017] ω (Ca) —Calcium content (%) in phosphorus-containing steel.

[0018] B) Determine the equivalent carbon content of phosphorus-containing steel:

[0019] C i =C ac -c

[0020] In the formula: C i — Carbon equivalent (%)

[0021] C) Solve for the actual deformation resistance of phosphorus-containing steel:

[0022] K = σ i +ηC i

[0023] Where: K – actual deformation resistance;

[0024] η – Carbon equivalent ratio coefficient.

[0025] D) Let Calculate the initial rolling force P using R:

[0026]

[0027] Where: P—initial rolling force;

[0028] R—Radius of the working roll of the i-th frame;

[0029] Δh—absolute reduction per pass, Δh = Hh;

[0030] ξ—Equivalent tension influence coefficient, ξ=0.3σ 前 +0.7σ 后 ;

[0031] B—Incoming material width;

[0032] ν—Poisson's ratio;

[0033] Q F —The external friction influence coefficient is expressed by the following formula:

[0034]

[0035] r — pass reduction rate

[0036] E) Calculate R' using the rolling force P:

[0037]

[0038] Where: R'—the flattening radius of the working roll of the i-th frame;

[0039] E—Modulus of elasticity.

[0040] F) Calculate P' using R':

[0041]

[0042] In the formula: P'—iterative rolling force;

[0043] Q F —The external friction influence coefficient is expressed by the following formula:

[0044]

[0045] G) Determine if |R-R'|≤Δ. If |R-R'|≤Δ, jump to H). If |R-R'|>Δ, let P=P', R=R' and jump to E).

[0046] H) Calculate the forward sliding value f s .

[0047]

[0048] Where: μ—friction coefficient.

[0049] I) Calculate the rolling torque M.

[0050]

[0051] In the formula: ξ—equivalent tension influence coefficient, ξ=0.3σ 前 +0.7σ 后 ;

[0052] Q G —The external friction influence coefficient is expressed by the following formula:

[0053]

[0054] r — pass reduction rate

[0055] J) Calculate the rolling speed v of phosphorus-containing steel.

[0056]

[0057] Where: W—rolling power;

[0058] η – Motor efficiency;

[0059] Compared with the prior art, the advantages of the present invention are as follows: (1) The present invention can fully combine the equipment characteristics of the five-stand six-roll cold rolling mill with the on-site production conditions of cold-rolled strip steel, and obtain the actual carbon equivalent calculation formula of phosphorus-containing steel by data regression through a large amount of on-site data. The phosphorus content of phosphorus-containing steel is used as the input variable to calculate the equivalent carbon of phosphorus-containing steel, thereby calculating its actual deformation resistance, calculating the rolling force of phosphorus-containing steel at a certain reduction, and finally using the calculated rolling force to obtain the rolling speed under the condition of a certain rolling power, that is, to predict the influence of phosphorus content on rolling speed during the cold rolling of phosphorus-containing steel; (2) The present invention can more accurately predict the exit speed of a certain stand when the five-stand cold rolling mill rolls phosphorus-containing steel before production, so as to adjust the rolling parameter settings, thereby improving the quality of strip steel rolled products, ensuring the rolling stability during the cold rolling of phosphorus-containing steel, and bringing greater economic benefits to enterprises. Attached Figure Description

[0060] Figure 1 This application presents a flowchart of a method for predicting the effect of phosphorus content on rolling speed during the cold rolling process of phosphorus-containing steel. Detailed Implementation

[0061] Taking the first stand of a five-stand, six-roll cold rolling mill for rolling a certain phosphorus-containing steel as an example, combined with... Figure 1This invention provides a detailed description of a method for predicting the effect of phosphorus content on rolling speed during the cold rolling of phosphorus-containing steel.

[0062] Example 1:

[0063] First, in step A), the rolling parameters for phosphorus-containing steel are set, mainly including: the carbon content c, phosphorus content, and other element content (based on the actual carbon equivalent calculation formula); the carbon equivalent ratio coefficient η; the strip entry thickness H of the first stand; the strip exit thickness h of the first stand; and the target deformation resistance σ of the first stand. i The unit tension σ at the front of the first frame 前 Unit tension σ behind the first frame 后 ; Incoming material width B; Diameter of the first stand work roll D; Friction coefficient of the first stand μ; Elastic modulus E; Poisson's ratio ν; Iteration parameter Δ; Rolling power W; Motor efficiency η.

[0064] Table 1 Rolling parameters for phosphorus-containing steel DQ1461H5

[0065]

[0066]

[0067] Set the formula C for calculating the actual carbon equivalent of specific phosphorus-containing steel grades. ac The formula is directly derived from regression analysis of a large amount of actual field data:

[0068]

[0069] Where: c—carbon content (%) in phosphorus-containing steel;

[0070] ω (Mn) —Manganese content (%) in phosphorus-containing steel;

[0071] ω (P) —Phosphorus content (%) in phosphorus-containing steel;

[0072] ω (B) —Boron content (%) in phosphorus-containing steel;

[0073] ω (Sn) —Tin content (%) in phosphorus-containing steel;

[0074] ω (Ca) —Calcium content (%) in phosphorus-containing steel.

[0075] Then, in step B), the equivalent carbon content of the phosphorus-containing steel is calculated:

[0076] C i =C ac -c

[0077] In the formula: C i — Carbon equivalent (%)

[0078] C was calculated i =0.0549%.

[0079] Then, in step C), the actual deformation resistance of the phosphorus-containing steel is calculated:

[0080] K = σ i +ηC i

[0081] Where: K – actual deformation resistance;

[0082] η – Carbon equivalent ratio coefficient.

[0083] The calculated value is K = 700.41 MPa.

[0084] Then in step D), let Calculate the initial rolling force P using R:

[0085]

[0086] Where: P—initial rolling force;

[0087] R—Radius of the working roll of the i-th frame;

[0088] Δh—absolute reduction per pass, Δh = Hh;

[0089] ξ—Equivalent tension influence coefficient, ξ=0.3σ 前 +0.7σ 后 ;

[0090] B—Incoming material width;

[0091] ν—Poisson's ratio;

[0092] Q F —The external friction influence coefficient is expressed by the following formula:

[0093]

[0094] r — pass reduction rate

[0095] The calculated value is P = 7637504.161N.

[0096] Subsequently, in step E), R' is calculated using the rolling force P:

[0097]

[0098] Where: R'—the flattening radius of the working roll of the i-th frame;

[0099] E—Modulus of elasticity.

[0100] The calculated value is R' = 231.867 mm.

[0101] Then in step F), P' is calculated using R':

[0102]

[0103] In the formula: P'—iterative rolling force;

[0104] Q F —The external friction influence coefficient is expressed by the following formula:

[0105]

[0106] The calculated value is P' = 8326859.969 N.

[0107] Then in step G), it is determined that |R-R'|≤Δ, |R-R'|=|202-231.867|=29.867>Δ=0.05, so let P=P', R=R' and jump to E).

[0108] Subsequently, in step E), R' is calculated using the rolling force P:

[0109]

[0110] Where: R'—the flattening radius of the working roll of the i-th frame;

[0111] E—Modulus of elasticity.

[0112] The calculated value is R' = 234.563 mm.

[0113] Then in step F), P' is calculated using R':

[0114]

[0115] In the formula: P'—iterative rolling force;

[0116] Q F —The external friction influence coefficient is expressed by the following formula:

[0117]

[0118] The calculated value is P' = 8387742.686 N.

[0119] Then in step G), determine if |R-R'|≤Δ, |R-R'|=|231.867-234.563|=2.696>Δ=0.05, then set P=P', R=R' and jump to E).

[0120] Subsequently, in step E), R' is calculated using the rolling force P:

[0121]

[0122] Where: R'—the flattening radius of the working roll of the i-th frame;

[0123] E—Modulus of elasticity.

[0124] The calculated value is R' = 234.8 mm.

[0125] Then in step F), P' is calculated using R':

[0126]

[0127] In the formula: P'—iterative rolling force;

[0128] Q F —The external friction influence coefficient is expressed by the following formula:

[0129]

[0130] The calculated value is P' = 8393109.855 N.

[0131] Then in step G), it is determined that |R-R'|≤Δ, |R-R'|=|234.563-234.8|=0.237>Δ=0.05, so let P=P', R=R' and jump to E).

[0132] Subsequently, in step E), R' is calculated using the rolling force P:

[0133]

[0134] Where: R'—the flattening radius of the working roll of the i-th frame;

[0135] E—Modulus of elasticity.

[0136] The calculated value is R' = 234.822 mm.

[0137] Then in step F), P' is calculated using R':

[0138]

[0139] In the formula: P'—iterative rolling force;

[0140] Q F —The external friction influence coefficient is expressed by the following formula:

[0141]

[0142] The calculated value is P' = 8393582.925 N.

[0143] Then in step G), if |R-R'|≤Δ, and |R-R'|=|234.8-234.822|=0.022<Δ=0.05, then jump to H).

[0144] Subsequently, in step H), the forward slip value f is calculated. s .

[0145]

[0146] Where: μ—friction coefficient.

[0147] Calculate f s =0.002.

[0148] Then, in step I), the rolling torque M is calculated.

[0149]

[0150] In the formula: ξ—equivalent tension influence coefficient, ξ=0.3σ 前 +0.7σ 后 ;

[0151] Q G —The external friction influence coefficient is expressed by the following formula:

[0152]

[0153] r — pass reduction rate

[0154] The calculated value is M = 181898.02 N·m.

[0155] Finally, in step J), the rolling speed v of phosphorus-containing steel is calculated.

[0156]

[0157] Where: W—rolling power;

[0158] η – Motor efficiency;

[0159] The calculated speed is v = 234.982 m / min.

[0160] Example 2:

[0161] First, in step A), the rolling parameters for phosphorus-containing steel are set, mainly including: the carbon content c, phosphorus content, and other element content (based on the actual carbon equivalent calculation formula); the carbon equivalent ratio coefficient η; the strip entry thickness H of the first stand; the strip exit thickness h of the first stand; and the target deformation resistance σ of the first stand.i The unit tension σ at the front of the first frame 前 Unit tension σ behind the first frame 后 ; Incoming material width B; Diameter of the first stand work roll D; Friction coefficient of the first stand μ; Elastic modulus E; Poisson's ratio ν; Iteration parameter Δ; Rolling power W; Motor efficiency η.

[0162] Table 1 Rolling parameters for phosphorus-containing steel DQ1461H5

[0163]

[0164] Set the formula C for calculating the actual carbon equivalent of specific phosphorus-containing steel grades. ac The formula is directly derived from regression analysis of a large amount of actual field data:

[0165]

[0166] Where: c—carbon content (%) in phosphorus-containing steel;

[0167] ω (Mn) —Manganese content (%) in phosphorus-containing steel;

[0168] ω (P) —Phosphorus content (%) in phosphorus-containing steel;

[0169] ω (B) —Boron content (%) in phosphorus-containing steel;

[0170] ω (Sn) —Tin content (%) in phosphorus-containing steel;

[0171] ω (Ca) —Calcium content (%) in phosphorus-containing steel.

[0172] Then, in step B), the actual carbon equivalent of the phosphorus-containing steel is calculated:

[0173] C i =C ac -c

[0174] In the formula: C i — Carbon equivalent (%)

[0175] C was calculated i =0.06%.

[0176] Then, in step C), the actual deformation resistance of the phosphorus-containing steel is calculated:

[0177] K = σ i +ηC i

[0178] Where: K – actual deformation resistance;

[0179] η – Carbon equivalent ratio coefficient.

[0180] The calculated value is K = 700.45 MPa.

[0181] Then in step D), let Calculate the initial rolling force P using R:

[0182]

[0183] Where: P—initial rolling force;

[0184] R—Radius of the working roll of the i-th frame;

[0185] Δh—absolute reduction per pass, Δh = Hh;

[0186] ξ—Equivalent tension influence coefficient, ξ=0.3σ 前 +0.7σ 后 ;

[0187] B—Incoming material width;

[0188] ν—Poisson's ratio;

[0189] Q F —The external friction influence coefficient is expressed by the following formula:

[0190]

[0191] r — pass reduction rate

[0192] The calculated value is P = 8004816.907 N.

[0193] Subsequently, in step E), R' is calculated using the rolling force P:

[0194]

[0195] Where: R'—the flattening radius of the working roll of the i-th frame;

[0196] E—Modulus of elasticity.

[0197] The calculated value is R' = 233.303 mm.

[0198] Then in step F), P' is calculated using R':

[0199]

[0200] In the formula: P'—iterative rolling force;

[0201] Q F —The external friction influence coefficient is expressed by the following formula:

[0202]

[0203] The calculated value is P' = 8875531.482N.

[0204] Then in step G), it is determined that |R-R'|≤Δ, |R-R'|=|202-233.303|=31.303>Δ=0.05, so let P=P', R=R' and jump to E).

[0205] Subsequently, in step E), R' is calculated using the rolling force P:

[0206]

[0207] Where: R'—the flattening radius of the working roll of the i-th frame;

[0208] E—Modulus of elasticity.

[0209] The calculated value is R' = 236.708 mm.

[0210] Then in step F), P' is calculated using R':

[0211]

[0212] In the formula: P'—iterative rolling force;

[0213] Q F —The external friction influence coefficient is expressed by the following formula:

[0214]

[0215] The calculated value is P' = 8959743.843N.

[0216] Then in step G), it is determined that |R-R'|≤Δ, |R-R'|=|233.303-236.708|=3.405>Δ=0.05, so let P=P', R=R' and jump to E).

[0217] Subsequently, in step E), R' is calculated using the rolling force P:

[0218]

[0219] Where: R'—the flattening radius of the working roll of the i-th frame;

[0220] E—Modulus of elasticity.

[0221] The calculated value is R' = 237.038 mm.

[0222] Then in step F), P' is calculated using R':

[0223]

[0224] In the formula: P'—iterative rolling force;

[0225] Q F —The external friction influence coefficient is expressed by the following formula:

[0226]

[0227] The calculated value is P' = 8967871.344 N.

[0228] Then in step G), determine if |R-R'|≤Δ, |R-R'|=|236.708-237.038|=0.33>Δ=0.05, then set P=P', R=R' and jump to E).

[0229] Subsequently, in step E), R' is calculated using the rolling force P:

[0230]

[0231] Where: R'—the flattening radius of the working roll of the i-th frame;

[0232] E—Modulus of elasticity.

[0233] The calculated value is R' = 237.069 mm.

[0234] Then in step F), P' is calculated using R':

[0235]

[0236] In the formula: P'—iterative rolling force;

[0237] Q F —The external friction influence coefficient is expressed by the following formula:

[0238]

[0239] The calculated value is P' = 8968655.586N.

[0240] Then in step G), it is determined that |R-R'|≤Δ, and |R-R'|=|237.038-237.069|=0.031<Δ=0.05, then jump to H).

[0241] Then, in step I), the forward slip value f is calculated. s .

[0242]

[0243] Where: μ—friction coefficient.

[0244] Calculate f s =0.017.

[0245] Then, in step I), the rolling torque M is calculated.

[0246]

[0247] In the formula: ξ—equivalent tension influence coefficient, ξ=0.3σ 前 +0.7σ 后 ;

[0248] Q G —The external friction influence coefficient is expressed by the following formula:

[0249]

[0250] r — pass reduction rate

[0251] The calculated value is M = 183643.782 N·m.

[0252] Finally, in step J), the rolling speed v of phosphorus-containing steel is calculated.

[0253]

[0254] Where: W—rolling power;

[0255] η – Motor efficiency;

[0256] The calculated speed is v = 236.26 m / min.

[0257] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A method for predicting the influence of phosphorus content on rolling speed during cold rolling of phosphorus-containing steel, characterized in that, The method includes the following steps: A) Set the rolling parameters for phosphorus-containing steel. B) Determine the equivalent carbon content of phosphorus-containing steel. C) Solve for the actual deformation resistance of phosphorus-containing steel. D) Let ,use Calculate the initial rolling force , E) Using rolling force calculate , F) Use calculate , G) Judgment ,if Then jump to H), if Then let And jump to E). H) Calculate the forward sliding value , I) Calculate the rolling torque , J) Calculation of rolling speed for phosphorus-containing steel ; Where, D) let ,use Calculate the initial rolling force : In the formula: —Initial rolling force; —No. The radius of the work rollers on the frame; —Absolute pressure reduction per pass ; —Equivalent tension influence coefficient ; —Incoming material width; —Poisson's ratio; —The external friction influence coefficient is expressed by the following formula: ； —Pass reduction rate ; E) Using rolling force calculate : In the formula: —No. Flattening radius of the work rollers on the machine frame; —Elastic modulus; F) Use calculate : In the formula: —Iterative rolling force; —The external friction influence coefficient is expressed by the following formula: ； I) Calculate the rolling torque , In the formula: —Equivalent tension influence coefficient ; —The external friction influence coefficient is expressed by the following formula: ； —Pass reduction rate , J) Calculation of rolling speed for phosphorus-containing steel , In the formula: —Rolling power; η – Motor efficiency.

2. The method for predicting the influence of phosphorus content on rolling speed during cold rolling of phosphorus-containing steel according to claim 1, characterized in that, A) Setting rolling parameters for phosphorus-containing steel, mainly including: carbon content of phosphorus-containing steel. Phosphorus content, other element content; carbon equivalent ratio coefficient ;No. frame strip entry thickness ;No. Frame strip exit thickness ;No. Frame target deformation resistance ;No. Unit tension in front of the frame ;No. Unit tension behind the frame Incoming material width ;No. Frame working roll diameter ;No. Frame friction coefficient Elastic modulus Poisson's ratio Iteration parameters Rolling power Motor efficiency , Set the formula for calculating the actual carbon equivalent of specific phosphorus-containing steel grades. The formula is directly derived from regression analysis of a large amount of actual field data. In the formula: —Carbon content (%) in phosphorus-containing steel; —Manganese content (%) in phosphorus-containing steel; —Phosphorus content (%) in phosphorus-containing steel; —Boron content (%) in phosphorus-containing steel; —Tin content (%) in phosphorus-containing steel; —Calcium content (%) in phosphorus-containing steel.

3. The method for predicting the influence of phosphorus content on rolling speed during cold rolling of phosphorus-containing steel according to claim 1, characterized in that, B) Determine the equivalent carbon content of phosphorus-containing steel: In the formula: — Carbon equivalent (%) 4. The method for predicting the influence of phosphorus content on rolling speed during cold rolling of phosphorus-containing steel according to claim 1, characterized in that, C) Solving for the actual deformation resistance of phosphorus-containing steel: In the formula: - Actual deformation resistance; - Carbon equivalent ratio factor.

5. The method for predicting the influence of phosphorus content on rolling speed during cold rolling of phosphorus-containing steel according to claim 1, characterized in that, G) Judgment ,if Then jump to H), if Then let And jump to E).

6. The method for predicting the influence of phosphorus content on rolling speed during cold rolling of phosphorus-containing steel according to claim 1, characterized in that, H) Calculate the forward sliding value , In the formula: —Coefficient of friction.

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