CN110656284A - One-steel multi-stage blank production method - Google Patents

Abstract

The invention discloses a method for producing a steel multi-stage blank, which relates to the technical field of steel smelting, wherein four types of products are defined according to castability and product characteristics, and the components are designed according to product performance requirements and strength levels suitable for carbon equivalent on the basis, so that the product structure is optimized, the universal use of the smelting blank is realized, the number of blank steel types is reduced, the stock of residual blanks is greatly reduced, the organization and production scheduling are facilitated, and the continuous casting operation rate is improved.

Description

One-steel multi-stage blank production method

Technical Field

The invention relates to the technical field of steel smelting, in particular to a method for producing a steel multi-stage blank.

Background

In the plate manufacturing process of iron and steel enterprises, because of the influence of the rolled material qualification rate and the heat weight, smelted blanks are difficult to be completely consumed in one order, the steel grades developed by the enterprises can be hundreds, if the components of each steel grade are designed and developed by research and development personnel, after the order is ended, a part of blanks are left, residual blanks are caused, and other research and development personnel are difficult to find the residual blanks, so the utilization rate is very low. The fund occupancy rate of the surplus billets to enterprises is high, and meanwhile, the cost of steel grades is high, and the section is increased. The smelting and scheduling difficulty is high due to steel dispersion, the component fluctuation of a continuous casting section is large in the continuous casting process of different steel types, the degradation and judgment amount is large, the waste is serious in the smelting process, the order quantity of the dispersed steel types is low, the requirement of casting times of a tundish cannot be met frequently, a group of steel can be produced into 20 furnaces originally, only about 10 furnaces can be produced under the influence of the order quantity, the continuous casting and group changing time is increased, the continuous casting operation rate is reduced, and the yield of crude steel of an enterprise is reduced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for producing a steel multi-stage blank, which comprises the following steps of

S1, classifying the steel grades according to the requirements on the carbon content in the manufacturing standard and specification of the ordered products, wherein C is less than 0.080% and is low-carbon, C is more than or equal to 0.080% and less than or equal to 0.17% and is peritectic, C is more than 0.17% and less than or equal to 0.22% and is medium-carbon, and C is more than or equal to 0.22% and less than or equal to 0.50% and is high-carbon;

s2, selecting products belonging to the same steel type in the order, integrating the products into a universal product under the steel type, and setting the carbon equivalent of the universal product to ensure that the mechanical property of the universal product simultaneously meets the manufacturing standard and specification requirement of each order product, and adjusting the component content of other alloys on the basis;

s3, according to the order quantity and delivery date requirements, combining and producing orders which can be applied to the same general product, and making a uniform smelting brand;

s4, designing a smelting process aiming at the flaw detection requirement of the product in the smelting process, wherein the flaw detection steel grade smelting process comprises the following steps: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting, and the smelting process of non-flaw detection steel types is as follows: molten iron desulphurization → BOF smelting → LF refining → CCM casting;

and S5, performing residual blank management on the smelting residual blank, and preferentially using the smelting residual blank for subsequent order production.

The technical effects are as follows: four types of products are defined according to castability and product characteristics, and on the basis, component design is carried out according to product performance requirements and strength levels suitable for carbon equivalent, so that the product structure is optimized, the universal use of smelting blanks is realized, the number of steel types of the blanks is reduced, the stock of the surplus blanks is greatly reduced, the organization and the production scheduling are facilitated, and the continuous casting operation rate is improved.

The technical scheme of the invention is further defined as follows:

the production method of the one-steel multi-stage blank comprises the following steps

S1, the requirements of the national standard GB/T1591 on the low-alloy high-strength structural steel Q390 component are as follows: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.050 percent of Nb, less than or equal to 0.13 percent of V, less than or equal to 0.30 percent of Cr, less than or equal to 0.05 percent of Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.40 percent;

the requirements of the national standard GB/T3531 on the components of the steel plate 15MnNiNbDR for the low-temperature pressure container are as follows: c is less than or equal to 0.18 percent, Si: 0.15-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Ni: 0.30% -0.70%, Nb: 0.015% -0.70%;

s2, selecting medium carbon steel component design according to product quality, cost and performance requirements, and setting the carbon equivalent to 0.40-0.43%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products in the S1 into a universal product, wherein the components are designed as follows: c: 0.16-0.18%, Mn: 1.3% -1.4%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.015% -0.025%, Ni: 0.30-0.35%, Ti: 0.008-0.020%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mo, and the mass percent of Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade C-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting grade C-1 according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

The production method of the one-steel multi-stage blank comprises the following steps

S1, the requirements of the material and welding specification CCS on the chemical components of the steel FH 32/36/40 for the high-strength ship structure are as follows: c is less than or equal to 0.16 percent, Si is less than or equal to 0.50 percent, Mn: 0.90-1.60%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, Nb is 0.02-0.05%, V: 0.05 to 0.10 percent of Ni, less than or equal to 0.20 percent of Cr, less than or equal to 0.02 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.35 percent of Cu, less than or equal to 0.08 percent of Mo, less than or equal to 0.009 percent of N, more than or equal to 0.015 percent of Al, and less than or equal to 0.12 percent of Nb + V + Ti; when more than two refined grain elements are used in Al, Nb and V, the lower limit of a single element is not applicable;

the API specification requires the chemical composition of the PSL2 steel for the X60M-X65M pipeline to be as follows: less than or equal to 0.12 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.15 percent of Nb, V and Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.50 percent of Cr, less than or equal to 0.50 percent of Cu, less than or equal to 0.50 percent of Mo, less than or equal to;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.40-0.43%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products into a general product, wherein the components are designed as follows: c: 0.05 to 0.07 percent, Mn: 1.50% -1.60%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.040% -0.050%, V is less than or equal to 0.05%, and Ti: 0.008-0.020%, Cr: 0.10-0.15%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mo, and the mass percent of Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade D-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting brand D-1 according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

The production method of the one-steel multi-stage blank comprises the following steps

The technical protocol of the steel plate of S1 and Q55O comprises the following components: less than or equal to 0.012 percent of C, less than or equal to 0.60 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.20 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.80 percent of Cu, less than or equal to 0.30 percent;

the technical protocol of the thick-specification tubular pile comprises the following components: less than or equal to 0.12 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.50 percent of Cr, less than or equal to 0.50 percent of Ni, less than or equal to 0.50 percent of Mo, less than or equal to 0.50 percent of Cu, less than or equal to 0.001 percent of B, and;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.38-0.45%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products into a general product, wherein the components are designed as follows: c: 0.04 to 0.07 percent of Mn: 1.5% -1.7%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.40-0.60%, V is less than or equal to 0.03%, Ni: 0.20-0.30%, Cr: 0.10% -0.20%, Mo: 0.10-0.15%, Cu is less than or equal to 0.03%, Ti: 0.008-0.020%, Al: 0.015-0.050%, B is less than or equal to 0.001%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade E-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting grade E-1 according to a new customer order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

The production method of the one-steel multi-stage blank comprises the following steps

S1, the component requirements of the structural steel for bridges GB/T714 standard on Q345Q-C/D are as follows: c is less than or equal to 0.18 percent, Si is less than or equal to 0.55 percent, Mn: 0.9 to 1.70 percent of Ni, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.03 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.55 percent of Cu, less than or equal to 0.20 percent of Mo, less than or equal to 0;

the structural steel for the bridge GB/T714 standard has the following component requirements on Q370Q-C/D: less than or equal to 0.18 percent of C, less than or equal to 0.55 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.03 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.55 percent of Cu, less than or equal to 0.20 percent of Mo, less;

the structural steel plate for the wind power generation tower has the following component requirements on Q345FT in GB/T28410 standard: less than or equal to 0.20 percent of C, less than or equal to 0.50 percent of Si, 0.9 to 1.65 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.12 percent of V, less than or equal to 0.30 percent of Cr, less than or equal to 0.05 percent of Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.33-0.38%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the three ordered products into a general product, wherein the components are designed as follows: c: 0.12-0.14%, Mn: 1.4% -1.6%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.030-0.040%, V is less than or equal to 0.03%, Ni is less than or equal to 0.05%, Cr is less than or equal to 0.05%, Mo is less than or equal to 0.05%, Cu is less than or equal to 0.03%, Ti: 0.008-0.020%, B is less than or equal to 0.001%, Ca: 0.0008% -0.040%, Al: 0.015-0.050%, N is less than or equal to 0.008%, Ceq: 0.33 to 0.38 percent;

s4, setting a smelting grade F-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused smelting grade F-1 blank according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

The invention has the beneficial effects that:

(1) the invention obviously reduces the quantity of smelting steel seeds, reduces the stock of blanks and the capital turnover of enterprises, thereby reducing the production cost;

(2) the invention is practical for steel manufacturing enterprises to produce plate products, is convenient for production and production scheduling, effectively improves the continuous casting operation rate and improves the yield;

(3) the invention reduces stock quantity of the blank, greatly reduces residual material quantity and blank degradation quantity, improves utilization rate of the blank and improves enterprise benefit;

(4) the invention can liberate the productivity of enterprises, improve the annual smelting yield by about 5 ten thousand tons, improve the benefit by 1500 ten thousand yuan, improve the delivery cycle of scattered orders, improve the variety of the received orders and improve the customer satisfaction, thereby not only improving the economic benefit of the enterprises, but also improving the enterprise competitiveness.

Detailed Description

Example 1

The embodiment provides a production method of a steel multi-stage blank, which comprises the following steps

S1, the requirements of the national standard GB/T1591 on the low-alloy high-strength structural steel Q390 component are as follows: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.050 percent of Nb, less than or equal to 0.13 percent of V, less than or equal to 0.30 percent of Cr, less than or equal to 0.05 percent of Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.40 percent;

the requirements of the national standard GB/T3531 on the components of the steel plate 15MnNiNbDR for the low-temperature pressure container are as follows: c is less than or equal to 0.18 percent, Si: 0.15-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Ni: 0.30% -0.70%, Nb: 0.015% -0.70%;

s2, selecting medium carbon steel component design according to product quality, cost and performance requirements, and setting the carbon equivalent to 0.40-0.43%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products in the S1 into a universal product, wherein the components are designed as follows: c: 0.16-0.18%, Mn: 1.3% -1.4%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.015% -0.025%, Ni: 0.30-0.35%, Ti: 0.008-0.020%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mo, and the mass percent of Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade C-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting grade C-1 according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

Example 2

The embodiment provides a production method of a steel multi-stage blank, which comprises the following steps

S1, the requirements of the material and welding specification CCS on the chemical components of the steel FH 32/36/40 for the high-strength ship structure are as follows: c is less than or equal to 0.16 percent, Si is less than or equal to 0.50 percent, Mn: 0.90-1.60%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, Nb is 0.02-0.05%, V: 0.05 to 0.10 percent of Ni, less than or equal to 0.20 percent of Cr, less than or equal to 0.02 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.35 percent of Cu, less than or equal to 0.08 percent of Mo, less than or equal to 0.009 percent of N, more than or equal to 0.015 percent of Al, and less than or equal to 0.12 percent of Nb + V + Ti; when more than two refined grain elements are used in Al, Nb and V, the lower limit of a single element is not applicable;

the API specification requires the chemical composition of the PSL2 steel for the X60M-X65M pipeline to be as follows: less than or equal to 0.12 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.15 percent of Nb, V and Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.50 percent of Cr, less than or equal to 0.50 percent of Cu, less than or equal to 0.50 percent of Mo, less than or equal to;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.40-0.43%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products into a general product, wherein the components are designed as follows: c: 0.05 to 0.07 percent, Mn: 1.50% -1.60%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.040% -0.050%, V is less than or equal to 0.05%, and Ti: 0.008-0.020%, Cr: 0.10-0.15%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mo, and the mass percent of Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade D-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting brand D-1 according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

Example 3

The embodiment provides a production method of a steel multi-stage blank, which comprises the following steps

The technical protocol of the steel plate of S1 and Q55O comprises the following components: less than or equal to 0.012 percent of C, less than or equal to 0.60 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.20 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.80 percent of Cu, less than or equal to 0.30 percent;

the technical protocol of the thick-specification tubular pile comprises the following components: less than or equal to 0.12 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.50 percent of Cr, less than or equal to 0.50 percent of Ni, less than or equal to 0.50 percent of Mo, less than or equal to 0.50 percent of Cu, less than or equal to 0.001 percent of B, and;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.38-0.45%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products into a general product, wherein the components are designed as follows: c: 0.04 to 0.07 percent of Mn: 1.5% -1.7%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.40-0.60%, V is less than or equal to 0.03%, Ni: 0.20-0.30%, Cr: 0.10% -0.20%, Mo: 0.10-0.15%, Cu is less than or equal to 0.03%, Ti: 0.008-0.020%, Al: 0.015-0.050%, B is less than or equal to 0.001%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade E-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting grade E-1 according to a new customer order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

Example 4

The embodiment provides a production method of a steel multi-stage blank, which comprises the following steps

S1, the component requirements of the structural steel for bridges GB/T714 standard on Q345Q-C/D are as follows: c is less than or equal to 0.18 percent, Si is less than or equal to 0.55 percent, Mn: 0.9 to 1.70 percent of Ni, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.03 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.55 percent of Cu, less than or equal to 0.20 percent of Mo, less than or equal to 0;

the structural steel for the bridge GB/T714 standard has the following component requirements on Q370Q-C/D: less than or equal to 0.18 percent of C, less than or equal to 0.55 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.03 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.55 percent of Cu, less than or equal to 0.20 percent of Mo, less;

the structural steel plate for the wind power generation tower has the following component requirements on Q345FT in GB/T28410 standard: less than or equal to 0.20 percent of C, less than or equal to 0.50 percent of Si, 0.9 to 1.65 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.12 percent of V, less than or equal to 0.30 percent of Cr, less than or equal to 0.05 percent of Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.33-0.38%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the three ordered products into a general product, wherein the components are designed as follows: c: 0.12-0.14%, Mn: 1.4% -1.6%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.030-0.040%, V is less than or equal to 0.03%, Ni is less than or equal to 0.05%, Cr is less than or equal to 0.05%, Mo is less than or equal to 0.05%, Cu is less than or equal to 0.03%, Ti: 0.008-0.020%, B is less than or equal to 0.001%, Ca: 0.0008% -0.040%, Al: 0.015-0.050%, N is less than or equal to 0.008%, Ceq: 0.33 to 0.38 percent;

s4, setting a smelting grade F-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused smelting grade F-1 blank according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

The invention adopts the method of balancing the product performance by carbon equivalent, effectively reduces the plate smelting product mark, improves the continuous casting operation rate and improves the crude steel smelting yield of a steel mill.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (5)

1. A production method of a steel multi-stage blank is characterized by comprising the following steps: comprises that

S1, classifying the steel grades according to the requirements on the carbon content in the manufacturing standard and specification of the ordered products, wherein C is less than 0.080% and is low-carbon, C is more than or equal to 0.080% and less than or equal to 0.17% and is peritectic, C is more than 0.17% and less than or equal to 0.22% and is medium-carbon, and C is more than or equal to 0.22% and less than or equal to 0.50% and is high-carbon;

s2, selecting products belonging to the same steel type in the order, integrating the products into a universal product under the steel type, and setting the carbon equivalent of the universal product to ensure that the mechanical property of the universal product simultaneously meets the manufacturing standard and specification requirement of each order product, and adjusting the component content of other alloys on the basis;

s3, according to the order quantity and delivery date requirements, combining and producing orders which can be applied to the same general product, and making a uniform smelting brand;

s4, designing a smelting process aiming at the flaw detection requirement of the product in the smelting process, wherein the flaw detection steel grade smelting process comprises the following steps: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting, and the smelting process of non-flaw detection steel types is as follows: molten iron desulphurization → BOF smelting → LF refining → CCM casting;

and S5, performing residual blank management on the smelting residual blank, and preferentially using the smelting residual blank for subsequent order production.

2. A method for producing a steel multi-stage billet according to claim 1, characterized in that: comprises that

S1, the requirements of the national standard GB/T1591 on the low-alloy high-strength structural steel Q390 component are as follows: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.050 percent of Nb, less than or equal to 0.13 percent of V, less than or equal to 0.30 percent of Cr, less than or equal to 0.05 percent of Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.40 percent;

the requirements of the national standard GB/T3531 on the components of the steel plate 15MnNiNbDR for the low-temperature pressure container are as follows: c is less than or equal to 0.18 percent, Si: 0.15-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Ni: 0.30% -0.70%, Nb: 0.015% -0.70%;

s2, selecting medium carbon steel component design according to product quality, cost and performance requirements, and setting the carbon equivalent to 0.40-0.43%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products in the S1 into a universal product, wherein the components are designed as follows: c: 0.16-0.18%, Mn: 1.3% -1.4%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.015% -0.025%, Ni: 0.30-0.35%, Ti: 0.008-0.020%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mo, and the mass percent of Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade C-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting grade C-1 according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

3. A method for producing a steel multi-stage billet according to claim 1, characterized in that: comprises that

S1, the requirements of the material and welding specification CCS on the chemical components of the steel FH 32/36/40 for the high-strength ship structure are as follows: c is less than or equal to 0.16 percent, Si is less than or equal to 0.50 percent, Mn: 0.90-1.60%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, Nb is 0.02-0.05%, V: 0.05 to 0.10 percent of Ni, less than or equal to 0.20 percent of Cr, less than or equal to 0.02 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.35 percent of Cu, less than or equal to 0.08 percent of Mo, less than or equal to 0.009 percent of N, more than or equal to 0.015 percent of Al, and less than or equal to 0.12 percent of Nb + V + Ti; when more than two refined grain elements are used in Al, Nb and V, the lower limit of a single element is not applicable;

the API specification requires the chemical composition of the PSL2 steel for the X60M-X65M pipeline to be as follows: less than or equal to 0.12 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.15 percent of Nb, V and Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.50 percent of Cr, less than or equal to 0.50 percent of Cu, less than or equal to 0.50 percent of Mo, less than or equal to;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.40-0.43%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products into a general product, wherein the components are designed as follows: c: 0.05 to 0.07 percent, Mn: 1.50% -1.60%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.040% -0.050%, V is less than or equal to 0.05%, and Ti: 0.008-0.020%, Cr: 0.10-0.15%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mo, and the mass percent of Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade D-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting brand D-1 according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

4. A method for producing a steel multi-stage billet according to claim 1, characterized in that: comprises that

The technical protocol of the steel plate of S1 and Q55O comprises the following components: less than or equal to 0.012 percent of C, less than or equal to 0.60 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.20 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.80 percent of Cu, less than or equal to 0.30 percent;

the technical protocol of the thick-specification tubular pile comprises the following components: less than or equal to 0.12 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.50 percent of Cr, less than or equal to 0.50 percent of Ni, less than or equal to 0.50 percent of Mo, less than or equal to 0.50 percent of Cu, less than or equal to 0.001 percent of B, and;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.38-0.45%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the two ordered products into a general product, wherein the components are designed as follows: c: 0.04 to 0.07 percent of Mn: 1.5% -1.7%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.40-0.60%, V is less than or equal to 0.03%, Ni: 0.20-0.30%, Cr: 0.10% -0.20%, Mo: 0.10-0.15%, Cu is less than or equal to 0.03%, Ti: 0.008-0.020%, Al: 0.015-0.050%, B is less than or equal to 0.001%, Ca: 0.0008 to 0.040 percent, less than or equal to 0.008 percent of N, Ceq: 0.40 to 0.43 percent;

s4, setting a smelting grade E-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused blank of the smelting grade E-1 according to a new customer order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.

5. A method for producing a steel multi-stage billet according to claim 1, characterized in that: comprises that

S1, the component requirements of the structural steel for bridges GB/T714 standard on Q345Q-C/D are as follows: c is less than or equal to 0.18 percent, Si is less than or equal to 0.55 percent, Mn: 0.9 to 1.70 percent of Ni, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.03 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.55 percent of Cu, less than or equal to 0.20 percent of Mo, less than or equal to 0;

the structural steel for the bridge GB/T714 standard has the following component requirements on Q370Q-C/D: less than or equal to 0.18 percent of C, less than or equal to 0.55 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.80 percent of Cr, less than or equal to 0.03 percent of Ti, less than or equal to 0.80 percent of Ni, less than or equal to 0.55 percent of Cu, less than or equal to 0.20 percent of Mo, less;

the structural steel plate for the wind power generation tower has the following component requirements on Q345FT in GB/T28410 standard: less than or equal to 0.20 percent of C, less than or equal to 0.50 percent of Si, 0.9 to 1.65 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.12 percent of V, less than or equal to 0.30 percent of Cr, less than or equal to 0.05 percent of Ti, less than or equal to 0.50 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.;

s2, selecting low-carbon steel components according to the quality, cost and performance requirements, and setting the carbon equivalent to 0.33-0.38%;

s3, on the basis of meeting the product manufacturing standard and specification, integrating the three ordered products into a general product, wherein the components are designed as follows: c: 0.12-0.14%, Mn: 1.4% -1.6%, Si: 0.20-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.030-0.040%, V is less than or equal to 0.03%, Ni is less than or equal to 0.05%, Cr is less than or equal to 0.05%, Mo is less than or equal to 0.05%, Cu is less than or equal to 0.03%, Ti: 0.008-0.020%, B is less than or equal to 0.001%, Ca: 0.0008% -0.040%, Al: 0.015-0.050%, N is less than or equal to 0.008%, Ceq: 0.33 to 0.38 percent;

s4, setting a smelting grade F-1 according to the formulated components, carrying out smelting production, and carrying out scheduling production according to the smelting grade by a production department;

s5, the product meets the flaw detection requirement, and the smelting process is designed as follows: molten iron desulphurization → BOF smelting → LF refining → RH vacuum treatment → CCM casting;

s6, carrying out re-matching on the unused smelting grade F-1 blank according to a new product order, preferentially using the residual blank, and carrying out recombination design smelting after the use of the blank is finished.