CN119972785A - A production method for ferritic stainless steel 022Cr18NbTi wire rod - Google Patents
A production method for ferritic stainless steel 022Cr18NbTi wire rod Download PDFInfo
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- CN119972785A CN119972785A CN202510205610.3A CN202510205610A CN119972785A CN 119972785 A CN119972785 A CN 119972785A CN 202510205610 A CN202510205610 A CN 202510205610A CN 119972785 A CN119972785 A CN 119972785A
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Abstract
The invention relates to a production method of a ferrite stainless steel 022Cr18NbTi wire rod, which comprises the following steps of 1, using a continuous casting square billet. 2. The billet is heated by a step-by-step heating furnace. 3. And rolling the steel into phi 85mm round steel by using a two-roller reversible cogging mill at the initial rolling temperature of 950-1050 ℃ for 11 passes. The hot rolling and hot rolling are carried out on an online roller hearth furnace process route, the furnace inlet temperature is more than or equal to 400 ℃, the temperature of a roller hearth furnace heating section is 760-780 ℃, the temperature of a soaking section is 770-790 ℃, the roller way speed is 0.6-0.9 m/min, and the roller hearth furnace is cooled to normal temperature after being discharged, and then packaged and collected. The on-line annealing purpose is achieved, and the tensile strength and the elongation of the steel are controlled within the qualified range.
Description
Technical Field
The invention relates to a production method of a ferrite stainless steel 022Cr18NbTi wire rod, in particular to a ferrite stainless steel 022Cr18NbTi wire rod which has good mechanical properties, tensile strength and elongation and can meet the requirements through reasonable heating, hot rolling, controlled rolling and controlled cooling, hot collecting after rolling and hot rolling on-line hot charging roller hearth furnace hot annealing processes.
Background
022Cr18NbTi contains Mn, S, P, cr, ni, ti, nb and other elements, is ferrite structure at room temperature, is ferrite structure when heated at high temperature, is mainly used for producing wire rods, is mainly used for processing and welding wires, and is finally applied to manufacturing corrosion-resistant pendants, supporting frames, automobile exhaust treatment devices and the like. The 022Cr18NbTi hot rolled wire rod has low magnetism, high brittleness of precipitated brittle phase, low strength, easy generation of cracks due to internal stress after heat, high grain growth tendency of ferrite stainless steel during heating and hot rolling, high crystallization speed, developed columnar crystal, possibility of fracture and crack due to untimely heat transfer heat treatment after hot rolling, coarse grains in the material after hot rolling due to internal stress after hot rolling, reduction of tensile strength through hot rolling and online heat treatment, improvement of elongation and improvement of mechanical property, so that the heat collecting and heat-loading after hot rolling and the annealing process after hot rolling of the 022Cr18NbTi wire rod are production keys, and are beneficial to drawing processing after heat treatment.
The invention aims at the problems and provides a production method of a ferrite stainless steel 022Cr18NbTi wire rod, which aims at solving the problems and obtaining a wire rod 022Cr18NbTi wire rod product with qualified mechanical property, tensile strength and elongation.
Disclosure of Invention
The invention aims to solve the problems and provide a production method of a ferrite stainless steel 022Cr18NbTi wire rod.
The production method of the ferritic stainless steel 022Cr18NbTi wire rod comprises the following steps of firstly, using a continuous casting square billet, rolling the billet with the section size of 210-220) x (210-220) mm by using a billet rolling mill, wherein the billet weight is 1150-1250kg, secondly, heating the billet by using a step heating furnace, heating the billet to a temperature of 850-1050 ℃ for 1-2.5 hours, heating the billet to a temperature of 1100-1120 ℃ for 1.5-3 hours, heating the billet to a temperature of 1080-1100 ℃ for 1.5-3.5 hours, rolling the billet by using a two-roll reversible cogging mill for 9-11 passes, rolling the billet into round steel with a rolling reduction of 13-18 mm, an initial rolling temperature of 950-1050 ℃, rolling the round steel rod into a diameter of 85-86.5 mm, carrying out high-speed flat rolling for a continuous rolling for 1-2.5 hours, pre-rolling for 1.5-3 hours, rolling for 1-100 m for a sizing mill, rolling for 0.100-2 m for a sizing mill, rolling for 0.100 m for a finishing mill, rolling for 2-25 m for 0.100 m, and then carrying out wire rolling for 0.100 m for 0-100 m for finishing mill finishing rolling, and rolling for 0.100 m for 0-2 m for finishing mill rolling.
The chemical components and the mass percentages of the ferrite stainless steel 022Cr18NbTi wire rod related by the method are as follows C：0.015%～0.03%、Si：1.0%～1.5%、Mn：0.20%～0.50%、P：0.015%～0.035%、S：0.010%～0.030%、Cr：17.2%～18.0%、Ni：0.20%～0.50%、Ti：0.05%～0.50%、Nb：0.35%～0.45%.
The method has the beneficial effects that the method can achieve the purposes of obtaining good heat treatment mechanical property, tensile strength and elongation percentage of the ferrite stainless steel 022Cr18NbTi wire rod and meeting the subsequent processing and use requirements.
Detailed Description
The invention discloses a production method of a ferrite stainless steel 022Cr18NbTi wire rod, a hot rolling and post-rolling heat collecting coil and a post-rolling heat-loading on-line roller hearth furnace annealing process.
The invention can achieve the aim of obtaining good heat treatment mechanical property, tensile strength and elongation of the ferrite stainless steel 022Cr18NbTi wire rod.
The technical proposal of the invention is as follows, 1, the chemical composition range of the ferrite stainless steel 022Cr18NbTi wire rod applicable to the invention is as follows ：C：0.015%～0.03%、Si：1.0%～1.5%、Mn：0.20%～0.50%、P：0.015%～0.035%、S：0.010%～0.030%、Cr：17.2%～18.0%、Ni：0.20%～0.50%、Ti：0.05%～0.50%、Nb：0.35%～0.45%.
2. The continuous casting square billet is used, the section size of the billet is (210-220) × (210-220) mm, the weight of the billet is 1150-1250 kg, and the surface of the billet has no defects affecting the processing of wire rods.
3. The billet is heated by a step-by-step heating furnace for a period of time of 850-1050 ℃ and a period of time of 1-2.5 hours, for a period of time of 1100-1120 ℃ and a period of time of 1.5-3 hours, and for a soaking period of time of 1080-1100 ℃ and a soaking period of 1.5-3.5 hours.
4. And rolling the steel into phi 85mm round steel by using a two-roller reversible cogging mill at the initial rolling temperature of 950-1050 ℃ for 11 passes. The round steel bar with phi of 85mm enters a high-speed wire rod horizontal-vertical alternating continuous rolling mill for hot rolling, wherein the high-speed wire rod rolling mill comprises a roughing mill, a middle rolling mill, a pre-finishing mill, a finishing mill and a reducing and sizing mill, the finished product wire rod is finally rolled into a specified size through a frame reducing and sizing mill after hot rolling through each unit rolling mill in the rolling process, the average rolling reduction is 2.25mm-2.65mm, the temperature of a rolled piece in the process is controlled to 850-950 ℃, the wire-throwing temperature is 850-950 ℃, water tanks No. 1, no. 2 and No. 3 can be used according to the wire-throwing temperature, the air-cooled roller way uses 1 section and 2 sections, and the speed setting range is 9-12 m/min. And performing hot coil collecting and hot rolling on-line hot charging and annealing processes after rolling.
5. The process route of hot rolling after hot collecting and hot mounting on-line roller hearth furnace after rolling is that the furnace inlet temperature is more than or equal to 400 ℃, the temperature of a heating section of the roller hearth furnace is 760-780 ℃, the temperature of a soaking section is 770-790 ℃, the roller speed is set to be 0.6-0.9 m/min, and the roller hearth furnace is cooled to normal temperature after discharging and enters packaging and collecting. The on-line annealing purpose is achieved, and the mechanical property, tensile strength and elongation of the steel are controlled within the qualified range.
Example 1
The embodiment is used for the production method of 022Cr18NbTi wire rods with the specification of phi 5.5 mm.
1. The chemical composition of the alloy comprises 0.017% of C, 1.2% of Si, 0.25% of Mn, 0.016% of P, 0.018% of S, 17.5% of Cr, 0.28% of Ni, 0.10% of Ti and 0.37% of Nb.
2. The section size of the billet is 218 multiplied by 219mm, the weight of the billet is 1.210kg, and the surface of the billet has no defects affecting the processing of wire rods.
3. The step heating furnace is used for heating the first-stage temperature 958 ℃, the second-stage temperature 1119 ℃ and the soaking-stage temperature 1094 ℃.
4. And rolling into phi 85mm round steel by using a two-roller reversible cogging mill at a starting rolling temperature of 1043 ℃ for 11 passes. The round steel bar with phi of 85mm enters a high-speed wire rod horizontal-vertical alternating continuous rolling mill for hot rolling, and is rolled by a roughing mill, a middle rolling mill, a pre-finishing mill, a finishing mill and a reducing sizing mill, and finally, the finished wire rod is rolled by a frame reducing sizing mill, wherein the diameter size of the finished wire rod is 5.50mm-5.60mm, the ovality is 0.1mm, the average reduction is 2.34mm, the temperature of a rolled piece is controlled to 850-950 ℃ in the process, the wire-throwing temperature is 938 ℃, the opening of a water valve of a rolling line 1# water tank is 10%, the opening of a water valve of a 2# water tank is 5% and the opening of a water valve of a 3# water tank is 17%, the speed of a 1-section speed set value of an air cooling roller way is 9m/min, and the speed of a 2-section speed set value is 12m/min. And performing hot coil collecting and hot rolling on-line hot charging and annealing processes after rolling.
5. The process route of the hot-rolled coil collection and the hot-rolled on-line roller hearth furnace comprises the steps of feeding the hot coil into the furnace at 435 ℃, heating the roller hearth furnace at 775 ℃, soaking the roller hearth at 781 ℃, setting the roller way speed to be 0.75 m/min, discharging the hot coil, air cooling to normal temperature, and packaging and collecting.
6. The linear performance quality is that the online heat treatment 022Cr18NbTi wire rod has no residual stress, mechanical property, tensile strength and elongation reaching the requirements, the tensile strength is 491MPa and 495MPa, the tensile strength standard is more than or equal to 420MPa, the elongation is 34% and 35%, the elongation standard is more than or equal to 20%, and the requirements are met.
Example 2
The embodiment is used for the production method of 022Cr18NbTi wire rods with the specification of phi 5.5 mm.
1. The chemical composition of the alloy comprises 0.025% of C, 1.3% of Si, 0.50% of Mn, 0.025% of P, 0.019% of S, 17.7% of Cr, 0.40% of Ni, 0.080% of Ti and 0.35% of Nb.
2. The section size of the billet is 219 multiplied by 221mm, the weight of the billet is 1.225kg, and the surface of the billet has no defects affecting the processing of wire rods.
3. The step heating furnace is used for heating the first-stage temperature 965 ℃, the second-stage temperature 1108 ℃ and the soaking-stage temperature 1087 ℃.
4. And (3) rolling into phi 86.4mm round steel by using a two-roller reversible cogging mill at a start rolling temperature of 1037 ℃ for 9 passes. The round steel bar with the diameter of 86.4mm enters a high-speed wire rod horizontal interchange continuous rolling mill for hot rolling, and is rolled by a roughing mill, a middle rolling mill, a pre-finishing mill, a finishing mill and a reducing sizing mill, and finally, a finished product wire rod is rolled by a frame reducing sizing mill, wherein the diameter size is 5.50mm-5.60mm, the ovality is 0.1mm, the average reduction is 2.37mm, the temperature of a rolled piece is controlled to 855-945 ℃ in the process, the wire laying temperature is 935 ℃, the opening degree of a rolling line 1# water tank valve is 13%, the opening degree of a 2# water tank valve is 6% and the opening degree of a 3# water tank valve is 16%, the 1-section speed set value of an air cooling roller way is 10m/min, and the 2-section speed set value is 12m/min. And performing hot coil collecting and hot rolling on-line hot charging and annealing processes after rolling.
5. The process route of the hot-rolled coil collection and the hot-rolled on-line roller hearth furnace comprises the steps of feeding the hot-rolled coil into the furnace at 457 ℃, heating the roller hearth furnace at 774 ℃, soaking the roller hearth at 789 ℃, setting the roller way speed to be 0.80 m/min, discharging the hot-rolled coil, air-cooling to normal temperature, and packaging and collecting.
6. The online heat treatment 022Cr18NbTi wire rod has no residual stress, mechanical property, tensile strength and elongation which meet the requirements, the tensile strength is 483MPa and 487MPa, the tensile strength standard is more than or equal to 420MPa, the elongation is 35.4% and 35.9%, the elongation standard is more than or equal to 20%, and the requirements are met.
Example 3
The embodiment is used for the production method of 022Cr18NbTi wire rods with the specification of phi 5.5 mm.
1. The chemical composition of the alloy comprises 0.03% of C, 1.5% of Si, 0.40% of Mn, 0.035% of P, 0.020% of S, 18.0% of Cr, 0.30% of Ni, 0.50% of Ti and 0.45% of Nb.
2. The section size of the billet is 219 multiplied by 223mm, the weight of the billet is 1.228kg, and the surface of the billet has no defects affecting the processing of wire rods.
3. A step heating furnace, which heats the first section at 968 ℃, the second section at 1105 ℃ and the soaking section at 1084 ℃.
4. And (3) rolling into phi 85.5mm round steel by using a two-roller reversible cogging mill for 9 passes at an initial rolling temperature of 1025 ℃. The round steel bar with phi of 85.5mm enters a high-speed wire rod horizontal interchange continuous rolling mill for hot rolling, and is rolled by a roughing mill, a middle rolling mill, a pre-finishing mill, a finishing mill and a reducing sizing mill, and finally, a finished product wire rod is rolled by a frame reducing sizing mill, wherein the diameter size is 5.50mm-5.60mm, the ovality is 0.1mm, the average reduction is 2.325mm, the temperature of a rolled piece is controlled to 850-950 ℃ in the process, the spinning temperature is 929 ℃, the opening degree of a water valve of a rolling line 1# water tank is 12.5%, the opening degree of a water valve of a 2# water tank is 7% and the opening degree of a water valve of a 3# water tank is 18%, the speed of an air cooling roller way 1 section is set to be 9m/min, and the speed of a 2 section is set to be 12m/min. And performing hot coil collecting and hot rolling on-line hot charging and annealing processes after rolling.
5. The process route of hot rolling after hot collecting and hot mounting at the bottom of a roller is that the furnace inlet temperature is 468 ℃, the temperature of a heating section of the roller bottom furnace is 769 ℃, the temperature of a soaking section is 785 ℃, the roller speed is set within a range of 0.85m/min, and the roller is cooled to normal temperature after discharging and enters packaging and collecting.
6. The online heat treatment 022Cr18NbTi wire rod has no residual stress, mechanical property, tensile strength and elongation which meet the requirements, the tensile strength is 469MPa and 475MPa, the tensile strength standard is more than or equal to 420MPa, the elongation is 36.4% and 37.1%, the elongation standard is more than or equal to 20%, and the requirements are met.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A production method of a ferrite stainless steel 022Cr18NbTi wire rod is characterized by comprising the following steps:
firstly, using a continuous casting square billet as a steel billet, wherein the section size of the steel billet is (210-220) x (210-220) mm, and the weight of the steel billet is 1150-1250kg;
Heating the billet by a step heating furnace, wherein the temperature of the billet is 850-1050 ℃ for one period of heating time is 1-2.5 hours, the temperature of the billet is 1100-1120 ℃ for two periods of heating time is 1.5-3 hours, the temperature of the billet is 1080-1100 ℃ for the soaking period of heating time is 1.5-3.5 hours;
rolling the billet heated by a heating furnace by using a two-roller reversible cogging mill for 9-11 passes, wherein the rolling reduction of each pass is 13-18 mm, the initial rolling temperature is 950-1050 ℃, round steel with phi of 85-phi of 86.5mm is rolled, round steel bars enter a high-speed wire rod horizontal interchange continuous rolling mill for hot rolling, the layout of the high-speed wire rod rolling mill comprises a roughing mill, a middle rolling mill, a pre-finishing mill, a finishing mill and a reducing sizing mill, after the rolling process is carried out by rolling by each unit rolling mill, a finished product wire rod is finally rolled by the reducing sizing mill, the average rolling reduction is 2.25-2.65 mm, the rolling piece temperature is controlled to 850-950 ℃, the wire-throwing temperature is 850-950 ℃, and 1# water tanks, 2# water tanks and 3# water tanks are used according to the wire-throwing temperature, and the speeds of 1 segment and 2 segment of an air-cooling roller way are 9-12 m/min;
And fourthly, performing hot coil collecting and hot rolling on-line hot charging and heat annealing processes after hot rolling, wherein the furnace charging temperature is more than or equal to 400 ℃, performing hot rolling on-line hot charging on a roller hearth furnace for annealing after hot coil collecting, the heating section temperature is 760-780 ℃, the soaking section temperature is 770-790 ℃, the roller way speed is 0.6-0.9 m/min, and performing air cooling to normal temperature after discharging, and packaging and collecting.
2. The method for producing a ferritic stainless steel 022Cr18NbTi wire rod according to claim 1, wherein the method is characterized in that the ferritic stainless steel 022Cr18NbTi wire rod comprises the following chemical components in percentage by mass C：0.015%～0.03%、Si：1.0%～1.5%、Mn：0.20%～0.50%、P：0.015%～0.035%、S：0.010%～0.030%、Cr：17.2%～18.0%、Ni：0.20%～0.50%、Ti：0.05%～0.50%、Nb：0.35%～0.45%.
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