Wear-resistant corrosion-resistant extra-thick high-strength duplex stainless steel composite plate and production method thereof

Abstract

A wear-resistant corrosion-resistant extra-thick high-strength duplex stainless steel composite plate and a production method thereof are characterized in that a stainless steel coating adopts S22053 duplex stainless steel, and the stainless steel coating comprises the following chemical components in percentage by mass: 0.02%-0.028% of C, 0.35%-0.55% of Si, 1.35%-1.55% of Mn, less than or equal to 0.03% of P, less than or equal to 0.004% of S, 22.0%-22.5% of Cr, 5.0%-5.3% of Ni, 2.9%-3.3% of Mo, 0.16%-0.19% of N and the balance of Fe and inevitable impurities; the base layer is made of high-strength low-temperature steel and comprises the following chemical components in percentage by mass: 0.08%-0.11% of C, 0.15%-0.25% of Si, 1.45%-1.55% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, 0.02%-0.05% of Al, 0.03%-0.04% of Nb, 0.06%-0.07% of V, 0.008%-0.02% of Ti, 0.2%-0.3% of Cr, 0.30%-0.35% of Cu, 0.6%-0.7% of Ni and the balance of Fe and inevitable impurities. The preparation process comprises the steps of assembly, heating, rolling, cooling, heat treatment and finishing.

Description

Technical Field

[0001] This invention belongs to the field of rolling composite technology and relates to a wear-resistant and corrosion-resistant extra-thick high-strength duplex stainless steel composite plate and its production method. Background Technology

[0002] Large water pumps are key equipment in the national economy and major projects, widely used in water conservancy projects, energy and power, municipal water supply, marine and shipbuilding industries. The base is its core supporting component, bearing the entire weight of the pump unit (pump body, motor, gearbox, etc.) and the complex dynamic loads generated during operation (such as vibration, torque, and impact). The performance of the base material directly affects the stability, reliability, accuracy, and lifespan of the entire unit. Therefore, the steel materials used for large water pump bases are developing towards high performance, lightweight, green manufacturing, and intelligent manufacturing.

[0003] With the development of polar and deep-sea resources, the demand for large water pumps has surged, requiring steel for large pump bases to have large thicknesses and excellent low-temperature, wear-resistant, and corrosion-resistant properties. However, there is still a lack of technology for preparing ultra-thick, high-strength duplex stainless steel composite plates suitable for the harsh environments of polar regions and the ocean. The market urgently needs a composite material that can combine the above-mentioned comprehensive properties and its reliable preparation process. Summary of the Invention

[0004] This invention aims to provide a wear-resistant and corrosion-resistant extra-thick high-strength duplex stainless steel composite plate and its production method. The plate has a thickness ≥100mm (base layer thickness ≥90mm, cladding layer thickness ≥10mm), yield strength ≥460 MPa, tensile strength ≥550 MPa, elongation after fracture ≥17%, Charpy V-notch impact energy at -60 ℃ ≥60 J, shear strength ≥210 MPa, straight plate shape, and 100% interfacial bonding rate.

[0005] The technical solution of this invention: A wear-resistant and corrosion-resistant extra-thick high-strength duplex stainless steel composite plate includes a stainless steel cladding and a base layer. The stainless steel cladding is made of S22053 duplex stainless steel, with the following chemical composition by mass percentage: C=0.02%~0.028%, Si=0.35%~0.55%, Mn=1.35%~1.55%, P≤0.03%, S≤0.004%, Cr=22.0%~22.5%, Ni=5.0%~5.3%, Mo=2.9%~3.3%, N=0.16%~0.19%, with the balance being Fe and unavoidable impurities. The base layer is high-strength low-temperature steel. The chemical composition, by mass percentage, is C=0.08%~0.11%, Si=0.15%~0.25%, Mn=1.45%~1.55%, P≤0.010%, S≤0.002%, Al=0.02%~0.05%, Nb=0.03%~0.04%, V=0.06%~0.07%, Ti=0.008%~0.02%, Cr=0.2%~0.3%, Cu=0.30%~0.35%, Ni=0.6%~0.7%, with the balance being Fe and unavoidable impurities; the duplex stainless steel composite plate has a yield strength ≥460 MPa, tensile strength ≥550 MPa, elongation after fracture ≥17%, Charpy V-notch impact energy at -60 ℃ ≥60 J, shear strength ≥210 MPa, straight plate shape, and 100% interfacial bonding rate.

[0006] A method for producing an extra-thick, high-strength duplex stainless steel composite plate that is wear-resistant and corrosion-resistant includes the following process steps: (1) Assembly: The asymmetric AB type assembly method is adopted, where A is a high-strength low-temperature steel base material and B is S22053 stainless steel cladding material; the compression ratio is controlled between 3 and 5, and the surface treatment, assembly, welding blank packaging and vacuuming operations are carried out in sequence. (2) Heating: The composite billet is heated in the furnace within 48 hours after vacuuming. The heating temperature is 1170~1220℃. The total time in the furnace is ≥ billet thickness mm×1.0 min / mm, and the holding time is ≥ billet thickness mm×0.25 min / mm. (3) First stage rolling: initial rolling temperature ≥1080℃, final rolling temperature ≥1000℃, of which at least 2 passes have a reduction of ≥45mm, and the cumulative reduction rate is 70%~90%; (4) Controlled cooling of intermediate billet: Laminar flow cooling is adopted after rough rolling, with a cooling rate of 4~9℃ / s and a final cooling surface temperature of 830~860℃; (5) Second stage rolling: initial rolling temperature 810~830℃, final rolling temperature 780~820℃, cumulative reduction rate 40%~60%; (6) Cooling control: The starting cooling temperature is 750~790℃, the cooling rate is 5~12℃ / s, and the final cooling temperature is 650~690℃; (7) Heat treatment: Quenching and tempering heat treatment is adopted, the quenching temperature is 920±10℃, water cooling to room temperature, and the tempering temperature is 560±10℃. (8) Finishing: Straighten, measure, polish and package the composite board.

[0007] Technical principle explanation of the present invention: 1) The duplex stainless steel composite plate of the present invention uses S22053 duplex stainless steel as the cladding, which has excellent corrosion resistance and wear resistance. By controlling the cooling of the intermediate billet and implementing accelerated cooling after the second stage rolling, combined with tempering heat treatment, the residence time of the material in the sensitization temperature range is shortened, thereby effectively maintaining the corrosion resistance of the cladding.

[0008] 2) The base layer is designed with low carbon and nickel microalloying components to ensure good low-temperature toughness. Combined with high-reduction rolling, accelerated cooling, and tempering, a microstructure dominated by pearlite and ferrite is obtained, achieving a good balance between strength and toughness. The presence of elements such as Cu, Cr, and Ni also endows the base layer with a certain degree of corrosion resistance.

[0009] 3) The use of an asymmetric single-layer billet structure helps to increase the compression ratio, improve the internal structure of thick plates, promote interfacial metallurgical bonding, and improve the bonding quality.

[0010] The beneficial effects of this invention are as follows: The produced wear-resistant and corrosion-resistant extra-thick high-strength duplex stainless steel composite plate has a thickness ≥100mm (base layer thickness ≥90mm, cladding layer thickness ≥10mm), yield strength ≥460 MPa, tensile strength ≥550 MPa, elongation after fracture ≥17%, Charpy V-notch impact energy at -60 ℃ ≥60 J, shear strength ≥210 MPa, straight plate shape, and 100% interfacial bonding rate. It possesses excellent wear and corrosion resistance, high shear strength, high strength, and excellent low-temperature performance, meeting the performance requirements for pump bases in deep-sea, polar, and marine environments. Detailed Implementation

[0011] The present invention will be further illustrated by the following examples. Example 1

[0012] A wear-resistant and corrosion-resistant extra-thick high-strength duplex stainless steel composite plate and its production method. The blank thickness is 450mm, and the total thickness of the finished product is 105mm (85mm for the base material and 20mm for the cladding). The composite plate includes a stainless steel cladding and a base layer. The stainless steel cladding is made of S22053 duplex stainless steel, with a chemical composition (by mass percentage) of C=0.024%, Si=0.45%, Mn=1.45%, P=0.025%, S=0.001%, Cr=22.34%, Ni=5.11%, Mo=2.98%, N=0.18%, with the balance being Fe and unavoidable impurities. The base layer is high-strength low-temperature steel, with a chemical composition (by mass percentage) of C=0.09%, Si=0.18%, Mn=1.5%, P=0.008%, S=0.0012%, Al=0.035%, Nb=0.035%, V=0.066%, Ti=0.012%, Cr=0.23%, Cu=0.33%, Ni=0.65%, with the balance being Fe and unavoidable impurities. The process includes the following steps: (1) Assembly: The asymmetric AB type assembly method is adopted, where A is a high-strength low-temperature steel base material and B is S22053 stainless steel cladding material; the compression ratio is controlled at 4.3, and the surface treatment, assembly, welding blank encapsulation and vacuuming operations are carried out in sequence. (2) Heating: After the composite billet is vacuumed, it is heated in the furnace for 40 hours. The heating temperature is 1190℃, the total furnace time is 480min, and the holding time is 135min. (3) First stage rolling: the initial rolling temperature is 1100℃ and the final rolling temperature is 1020℃. The reduction in the second, third and fourth passes is 43mm, 42mm and 42mm respectively, with a cumulative reduction rate of 85.3%. (4) Controlled cooling of intermediate billet: Laminar flow cooling is adopted after rough rolling, with a cooling rate of 5℃ / s and a final cooling surface temperature of 840℃; (5) Second stage rolling: initial rolling temperature 825℃, final rolling temperature 795℃, cumulative reduction rate 54.2%; (6) Cooling control: The starting cooling temperature is 780℃, the cooling rate is 7℃ / s, and the final cooling temperature is 665℃; (7) Heat treatment: Quenching and tempering heat treatment is adopted, the quenching temperature is 910℃, water cooling to room temperature, and the tempering temperature is 565℃. (8) Finishing: Straighten, measure, polish and package the composite board.

[0013] The performance test results of the steel plate produced in Example 1 are shown in Table 1. Example 2

[0014] A wear-resistant and corrosion-resistant extra-thick high-strength duplex stainless steel composite plate and its production method, with a blank thickness of 500mm and a total finished product thickness of 120mm (100mm base material + 20mm cladding). The composite plate includes a stainless steel cladding and a base layer. The stainless steel cladding is made of S22053 duplex stainless steel, with the following chemical composition by mass percentage: C=0.025%, Si=0.45%, Mn=1.44%, P=0.026%, S=0.001%, Cr=22.55%, Ni=5.08%, Mo=2.99%, N=0.18%, with the balance being Fe and unavoidable impurities. The base layer is high-strength low-temperature steel, with the following chemical composition by mass percentage: C=0.10%, Si=0.19%, Mn=1.52%, P=0.007%, S=0.0011%, Al=0.036%, Nb=0.036%, V=0.065%, Ti=0.011%, Cr=0.24%, Cu=0.32%, Ni=0.66%, with the balance being Fe and unavoidable impurities. The process includes the following steps: (1) Assembly: The asymmetric AB type assembly method is adopted, where A is a high-strength low-temperature steel base material and B is S22053 stainless steel cladding material; the compression ratio is controlled at 4.2, and the surface treatment, assembly, welding blank packaging and vacuuming operations are carried out in sequence. (2) Heating: The composite billet is heated in the furnace 35 hours after vacuuming. The heating temperature is 1195℃, the total furnace time is 560min, and the holding time is 150min. (3) First stage rolling: the initial rolling temperature is 1108℃ and the final rolling temperature is 1025℃. The reduction in the second, third and fourth passes is 45mm, and the cumulative reduction rate is 88.5%. (4) Controlled cooling of intermediate billet: Laminar flow cooling is adopted after rough rolling, with a cooling rate of 6℃ / s and a final cooling surface temperature of 842℃; (5) Second stage rolling: initial rolling temperature 826℃, final rolling temperature 798℃, cumulative reduction rate 49%; (6) Cooling control: The starting cooling temperature is 785℃, the cooling rate is 6℃ / s, and the final cooling temperature is 670℃; (7) Heat treatment: Quenching and tempering heat treatment is adopted, the quenching temperature is 912℃, water cooling to room temperature, and the tempering temperature is 568℃. (8) Finishing: Straighten, measure, polish and package the composite board.

[0015] The performance test results of the steel plate produced in Example 2 are shown in Table 1.

[0016] Table 1. Performance test results of steel plates in the examples .

Claims

1. A wear-resistant and corrosion-resistant super-thick high-strength duplex stainless steel clad plate comprising a stainless steel cladding layer and a base layer, characterized in that: The stainless steel cladding adopts S22053 duplex stainless steel, and the chemical components are as follows in percentage by mass: C=0.02%-0.028%, Si=0.35%-0.55%, Mn=1.35%-1.55%, P≤0.03%, S≤0.004%, Cr=22.0%-22.5%, Ni=5.0%-5.3%, Mo=2.9%-3.3%, N=0.16%-0.19%, and the balance is Fe and inevitable impurities; the base layer is high-strength low-temperature steel, and the chemical components are as follows in percentage by mass: C=0.08%-0.11%, Si=0.15%-0.25%, Mn=1.45%-1.55%, P≤0.010%, S≤0.002%, Al=0.02%-0.05%, Nb=0.03%-0.04%, V=0.06%-0.07%, Ti=0.008%-0.02%, Cr=0.2%-0.3%, Cu=0.30%-0.35%, Ni=0.6%-0.7%, and the balance is Fe and inevitable impurities; the thickness is ≥100 mm, wherein the thickness of the base layer is ≥90 mm, the thickness of the cladding layer is ≥10 mm, the yield strength is ≥460 MPa, the tensile strength is ≥550 MPa, the elongation after fracture is ≥17%, the Charpy V-notch impact energy at-60 ℃ is ≥60 J, the shear strength is ≥210 MPa, the plate shape is flat, and the interface bonding rate reaches 100%.

2. A production method of a wear-resistant and corrosion-resistant super-thick high-strength duplex stainless steel clad plate, comprising the following steps: (1) blank assembling: adopting an asymmetric AB type blank assembling mode, wherein A is a high-strength low-temperature steel base material, and B is S22053 stainless steel cladding material; the compression ratio is controlled to be between 3 and 5, and the operations of surface treatment, assembly, welding blank packaging and vacuum extraction are sequentially performed; (2) heating: the composite blank is heated in a furnace within 48 hours after vacuum extraction, the heating temperature is 1170-1220 ℃, the total in-furnace time is ≥blank thickness mm×1.0 min / mm, and the holding time is ≥blank thickness mm×0.25 min / mm; (3) first stage rolling: the opening rolling temperature is ≥1080 ℃, the final rolling temperature is ≥1000 ℃, at least two pass reductions are ≥45 mm, and the cumulative reduction is 70%-90%; (4) intermediate blank controlled cooling: after rough rolling, the laminar cooling is adopted, the cooling speed is 4-9 ℃ / s, and the final cooling surface temperature is 830-860 ℃; (5) second stage rolling: the opening rolling temperature is 810-830 ℃, the final rolling temperature is 780-820 ℃, and the cumulative reduction is 40%-60%; (6) controlled cooling: the opening cooling temperature is 750-790 ℃, the cooling speed is 5-12 ℃ / s, and the final cooling temperature is 650-690 ℃; (7) heat treatment: adopting quenching and tempering heat treatment, the quenching temperature is 920±10 ℃, water cooling is performed to room temperature, and the tempering temperature is 560±10 ℃; (8) finishing: the clad plate is subjected to straightening, sizing, polishing and packaging treatment.