CN112442633A - High-nitrogen 316LN stainless steel welding wire and production method thereof - Google Patents
High-nitrogen 316LN stainless steel welding wire and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/047—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire of fine wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention belongs to the technical field of metallurgy, and relates to a high-nitrogen 316LN stainless steel welding wire and a production method thereof, wherein the welding wire comprises the following chemical components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, and Ni: 12.0-15.0%, Cr: 16.0-18.0%, Mo: 2.0-3.0%, N: 0.2 to 0.3%, and the balance of Fe and inevitable impurities. The production method comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing drawing, and nitrogen increasing treatment is carried out in the annealing drawing process. Compared with a smelting nitrogen-increasing process, the production period of the welding wire is shortened, the production cost is reduced, the nitrogen element in the obtained welding wire is far higher than that of the conventional welding wire, and the tensile strength and the yield strength of the welding wire are obviously improved.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a high-nitrogen 316LN stainless steel welding wire and a production method thereof.
Background
Nitrogen in austenitic stainless steels can form and expand the austenitic phase region, reducing the ferrite content, with a capacity 30 times that of metallic nickel. Meanwhile, nitrogen can improve the strength of the material in a solid solution strengthening mode, and the ductility and toughness are not obviously reduced. In addition, the addition of nitrogen can also increase the creep resistance, fatigue resistance and abrasion resistance of the austenitic stainless steel; in chemical aspect, nitrogen can improve the performance of materials in resisting intergranular corrosion, pitting corrosion, crevice corrosion and the like. Because of its many advantages, nitrogen-containing stainless steel has become a hot research point for metal materials. Among them, the stainless steel welding wire containing nitrogen is also a product with wide prospect.
The nitrogen content becomes an important limiting condition in the preparation of nitrogen-containing stainless steel welding wires. The conventional preparation method of the nitrogen-containing stainless steel welding wire is to smelt a nitrogen-containing stainless steel ingot, and produce a welding wire finished product through the steps of electroslag, forging, rolling, acid washing, drawing and the like. However, as molten steel passes through a delta-Fe phase region in the casting and solidification processes, the solubility of nitrogen in delta-Fe is very low, so that a large amount of dissolved nitrogen overflows in the cooling process, the nitrogen content required by components cannot be achieved, and meanwhile, redundant nitrogen elements overflow in the form of nitrogen bubbles to form nitrogen bubbles on a steel ingot, so that the quality of the steel ingot is influenced, and the nitrogen increasing amount is limited in the conventional smelting mode.
The maximum value of the nitrogen content in the conventional 316LN stainless steel welding wire is 0.16%, the yield strength is 245MPa, the tensile strength is 550MPa, and in the production process, multiple sampling, detection and component adjustment are needed, the smelting period is prolonged, and the workload and the production cost of field workers are improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-nitrogen 316LN stainless steel welding wire and a production method thereof. The invention adopts the following technical scheme:
a high-nitrogen 316LN stainless steel welding wire comprises the following chemical components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, and Ni: 12.0-15.0%, Cr: 16.0-18.0%, Mo: 2.0-3.0%, N: 0.20-0.30%, and the balance of Fe and inevitable impurities.
The mass percentage of the N element in the 316LN stainless steel welding wire is 0.25-0.30%.
The 316LN stainless steel welding wire has yield strength of 265-310MPa and tensile strength of 580-665 MPa.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenization treatment, forging, wire rod rolling, acid washing, annealing and drawing.
The smelting process of the invention uses a non-vacuum induction furnace for smelting.
The homogenization treatment process is carried out at 1050-1100 ℃ for 4-5 h.
In the forging process, the forging temperature is 900-1100 ℃.
The wire rod rolling procedure of the invention soaks for 1-1.5 h at 1040-1060 ℃, and the wire rod is rolled into a wire rod with the diameter of 5.45-5.55 mm, and the diameter of the wire rod coil is 80-100 mm.
In the annealing and drawing process, drawing and annealing are alternately carried out, and nitrogen increasing treatment is carried out in the annealing process; drawing passes are 5 times, annealing times are 4 times, annealing heating temperature is 1050-1100 ℃, and coiling speed of the wire rod is 2-4 m/min; the nitrogen increasing treatment is to introduce nitrogen into the tubular annealing furnace, and the flow rate of the nitrogen is 10-20L/min.
Compared with the prior art, the invention has the following advantages: 1. according to the invention, nitrogen increasing operation is not carried out in the smelting process, but nitrogen increasing treatment is carried out in the annealing and drawing process, so that the production period of the welding wire is shortened compared with that of a smelting nitrogen increasing process, and meanwhile, multiple sampling, detection and component adjustment are not needed, the workload of workers is reduced, and the production cost is reduced. 2. According to the invention, the nitrogen increasing process is transferred to the process of wire rod annealing, and nitrogen is increased in a heat treatment mode of the wire rod, so that the nitrogen increasing during smelting is avoided, and nitrogen bubbles can not appear in ingot casting. If nitrogen is added in the smelting process, nitrogen easily overflows in the form of nitrogen bubbles in the casting process. 3. The nitrogen element in the 316LN stainless steel welding wire is far higher than that of the conventional 316LN welding wire, and reaches 0.2-0.3%, and the tensile strength and yield strength of the welding wire are obviously improved, wherein the yield strength of the welding wire is 265-310MPa, and the tensile strength is 580-665 MPa.
Drawings
FIG. 1 is a diagram of internal quality of an ingot subjected to nitrogen increase in a smelting process by a traditional method;
FIG. 2 is a diagram showing the internal quality of an ingot produced by the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenization treatment, forging, wire rod rolling, acid pickling and annealing drawing, and nitrogen increasing treatment is carried out in the annealing drawing process. The steps are specifically as follows:
(1) smelting: smelting a steel billet without nitrogen addition through a non-vacuum induction furnace, and pouring out a round ingot;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon for protection in the process, controlling the gas flow at 150-170L/min, and controlling the melting speed at 4-5 kg/min in a stabilization period to produce the round ingot;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 790-810 ℃ at the speed of 200-300 ℃/h, preserving heat for 0.5-1 h, heating to 1050-1100 ℃ at the speed of 100-150 ℃/h, preserving heat for 4-5 h, discharging and air cooling.
(4) Forging: heating the electroslag ingot to 1080-1100 ℃, preserving heat for 2-3 h, and forging, wherein the final forging temperature is 900-920 ℃ every time, and forging into a square billet.
(5) A wire rod rolling procedure: heating the forging stock to 1040-1060 ℃ in a rolling mill heating furnace, soaking for 1-1.5 h, and rolling into a wire rod with the diameter of 5.45-5.55 mm; the diameter of the wire rod is 80-100 mm.
(6) Annealing and drawing: pickling the wire rod, removing surface oxide skin, annealing and drawing, wherein drawing and annealing are alternately carried out, drawing passes are 5 times, annealing times are 4 times, and nitrogen increasing treatment is carried out in the annealing process. And the nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the wire rod enters the tubular annealing furnace from one end, the nitrogen increasing treatment is carried out while moving in the furnace, the nitrogen increasing is started when the wire rod enters the annealing furnace, and the nitrogen increasing is finished when the wire rod moves out of the annealing furnace. The nitrogen flow is 10-20L/min, the annealing heating temperature is 1050-1100 ℃, and the wire rod winding speed is 2-4 m/min. Drawing to a diameter of 1.17-1.21 mm, and then coiling and packaging.
Example 1
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 400kg of steel billet without nitrogen is smelted by a 1t non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 150L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 800 ℃ at the speed of 200 ℃/h, preserving heat for 33min, heating to 1050 ℃ at the speed of 100 ℃/h, preserving heat for 4h, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1100 ℃, preserving heat for 3 hours, and then forging, wherein the finish forging temperature is 900 ℃ every time, and forging into a 140mm × 140mm square billet;
(5) a wire rod rolling procedure: heating the forging stock to 1045 ℃ in a heating furnace of a rolling mill, soaking for 60min, and rolling into a wire rod with the diameter of 5.5 mm; the diameter of the wire rod is 100 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 4.02mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.11mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.52mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.81mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.20mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the flow rate of the nitrogen is 20L/min, the annealing heating temperature is 1100 ℃, and the coiling speed of the wire rod is 2 m/min.
Example 2
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 230kg of steel billet without nitrogen is smelted by a 250kg non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 150L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 792 ℃ at the speed of 250 ℃/h, preserving heat for 1h, heating to 1060 ℃ at the speed of 150 ℃/h, preserving heat for 5h, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1086 ℃, preserving heat for 2.5 hours, and then forging, wherein the final forging temperature of each fire is 916 ℃, and the blank is forged into a square billet of 140mm multiplied by 140 mm;
(5) a wire rod rolling procedure: heating the forging stock to 1043 ℃ in a heating furnace of a rolling mill, soaking for 62min, and rolling into a wire rod with the diameter of 5.5 mm; the diameter of the wire rod is 94 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 3.99mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.10mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.5mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.81mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.21mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 12L/min, the annealing heating temperature is 1100 ℃, and the coiling speed of the wire rod is 3 m/min.
Example 3
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 210kg of steel billet without nitrogen is smelted by a 250kg non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 155L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 810 ℃ at a speed of 220 ℃/h, preserving heat for 0.5h, heating to 1055 ℃ at a speed of 125 ℃/h, preserving heat for 4.5h, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1080 ℃, preserving heat for 3 hours, and then forging, wherein the final forging temperature is 900 ℃ per fire, and the blank is forged into a 140mm × 140mm square billet;
(5) a wire rod rolling procedure: heating the forging stock to 1050 ℃ in a heating furnace of a rolling mill, soaking for 60min, and rolling into a wire rod with the diameter of 5.5 mm; the diameter of the wire rod is 99 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 4.01mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.08mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.51mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.78mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.19mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 10L/min, the annealing heating temperature is 1055 ℃, and the coiling speed of the wire rod is 4 m/min.
Example 4
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: smelting 650kg of steel billets without nitrogen through a 1t non-vacuum induction furnace, and pouring round ingots with the diameter of 220 mm;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 150L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 790 ℃ at 260 ℃/h, preserving heat for 45min, heating to 1070 ℃ at 110 ℃/h, preserving heat for 250min, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1098 ℃, preserving heat for 2.5 hours, and then forging, wherein the finish forging temperature of each fire is 920 ℃, and the blank is forged into a square billet of 130mm multiplied by 130 mm;
(5) a wire rod rolling procedure: heating the forging stock in a rolling mill heating furnace to 1060 ℃, soaking for 81min, and rolling into a wire rod with the diameter of 5.45 mm; the diameter of the wire rod is 80 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 3.99mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.08mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.49mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.79mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.20mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 17L/min, the annealing heating temperature is 1085 ℃, and the coiling speed of the wire rod is 3 m/min.
Example 5
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 850kg of steel billet without nitrogen is smelted by a 1t non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow to be 165L/min and the melting speed to be 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 805 ℃ at 300 ℃/h, keeping the temperature for 50min, heating to 1060 ℃ at 143 ℃/h, keeping the temperature for 275min, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1100 ℃, preserving heat for 2 hours, and then forging, wherein the final forging temperature of each fire is 920 ℃, and forging into a 130mm x 130mm square billet;
(5) a wire rod rolling procedure: heating the forging stock to 1052 ℃ in a rolling mill heating furnace, soaking for 66min, and rolling into a wire rod with the diameter of 5.52 mm; the diameter of the wire rod is 90 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 4.02mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.11mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.51mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.79mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.18mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 15L/min, the annealing heating temperature is 1075 ℃, and the coiling speed of the wire rod is 4 m/min.
Example 6
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 200kg of steel billet without nitrogen is smelted by a 250kg non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 157L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 810 ℃ at 275 ℃/h, preserving heat for 55min, heating to 1080 ℃ at 117 ℃/h, preserving heat for 290min, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1095 ℃, preserving heat for 3 hours, and then forging, wherein the finish forging temperature of each fire is 903 ℃, and the blank is forged into a 130mm x 130mm square billet;
(5) a wire rod rolling procedure: heating the forging stock to 1040 ℃ in a rolling mill heating furnace, soaking for 60min, and rolling into a wire rod with the diameter of 5.5 mm; the diameter of the wire rod is 96 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 4.01mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.11mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.52mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.77mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.17mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 19L/min, the annealing heating temperature is 1095 ℃, and the coiling speed of the wire rod is 2 m/min.
Example 7
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 785kg of steel billet without nitrogen is smelted by a 1t non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 168L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 808 deg.C/h, maintaining for 50min, heating to 1095 deg.C/h, maintaining for 5h, discharging, and air cooling;
(4) forging: heating the electroslag ingot to 1090 ℃, preserving heat for 160min, and then forging, wherein the finish forging temperature of each fire is 914 ℃, and forging into a 130mm x 130mm square billet;
(5) a wire rod rolling procedure: heating the forging stock in a rolling mill heating furnace to 1060 ℃, soaking for 74min, and rolling into a wire rod with the diameter of 5.54 mm; the diameter of the wire rod is 86 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 4.01mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.11mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.52mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.81mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.19mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 11L/min, the annealing heating temperature is 1090 ℃, and the coiling speed of the wire rod is 3 m/min.
Example 8
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 684kg of steel billet without nitrogen is smelted by a 1t non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 170L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 5.48 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 799 ℃ at the speed of 240 ℃/h, preserving heat for 30min, heating to 1055 ℃ at the speed of 110 ℃/h, preserving heat for 4h, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1100 ℃, preserving heat for 170min, and then forging, wherein the finish forging temperature is 905 ℃ per fire, and the blank is forged into a 130mm x 130mm square billet;
(5) a wire rod rolling procedure: heating the forging stock to 1050 ℃ in a heating furnace of a rolling mill, soaking for 90min, and rolling into a wire rod with the diameter of 5.45 mm; the diameter of the wire rod is 88 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 4.01mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.08mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.48mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.83mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.19mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 16L/min, the annealing heating temperature is 1080 ℃, and the coiling speed of the wire rod is 3 m/min.
Example 9
The chemical components and the mass percentage of the high-nitrogen 316LN stainless steel welding wire of the embodiment are shown in Table 1, and the mechanical properties are shown in Table 2.
The production method of the high-nitrogen 316LN stainless steel welding wire comprises the working procedures of smelting, electroslag remelting, homogenizing treatment, forging, wire rod rolling, acid washing and annealing and drawing, and nitrogen increasing treatment is carried out in the annealing and drawing process. The steps are specifically as follows:
(1) smelting: 230kg of steel billet without nitrogen is smelted by a 250kg non-vacuum induction furnace, and a round ingot with the diameter of 220mm is cast;
(2) an electroslag remelting process: carrying out electroslag remelting on the round ingot, introducing argon gas for protection in the process, controlling the gas flow at 150L/min and the melting speed at 4-5 kg/min in a stabilization period, and producing the round ingot with the diameter of 300 mm;
(3) a homogenization treatment step: homogenizing the round ingot, heating to 801 ℃ at the speed of 250 ℃/h, preserving heat for 59min, heating to 1050 ℃ at the speed of 128 ℃/h, preserving heat for 4.5h, discharging and air cooling;
(4) forging: heating the electroslag ingot to 1085 ℃, preserving heat for 2.5 hours, and then forging, wherein the finish forging temperature of each fire is 910 ℃, and forging into a square billet of 130mm multiplied by 130 mm;
(5) a wire rod rolling procedure: heating the forging stock to 1059 ℃ in a heating furnace of a rolling mill, soaking for 70min, and rolling into a wire rod with the diameter of 5.48 mm; the diameter of the wire rod is 100 mm;
(6) annealing and drawing: pickling the wire rod, removing surface oxide skin, performing annealing drawing, alternately performing drawing and annealing, drawing the wire rod for the first time to the diameter of 3.99mm, and performing annealing nitrogen-increasing treatment for the first time; drawing for the second time to the diameter of 3.08mm, and carrying out annealing and nitrogen increasing treatment for the second time; drawing for the third time to the diameter of 2.50mm, and carrying out annealing nitrogen increasing treatment for the third time; fourth drawing to the diameter of 1.80mm, and carrying out fourth annealing nitrogen increasing treatment; drawing to diameter of 1.21mm for the fifth time, and then coiling and packaging. The annealing and nitrogen increasing treatment is carried out in a tubular annealing furnace, nitrogen is introduced into the furnace, the nitrogen flow is 14L/min, the annealing heating temperature is 1070 ℃, and the coiling speed of the wire rod is 4 m/min.
Comparative example
3 batches of 316LN stainless steel welding wires with the conventional specification of 1.2mm are selected as a comparative example 1, a comparative example 2 and a comparative example 3 respectively, and component detection is carried out, wherein the specific components are shown in Table 1, and the mechanical properties are shown in Table 2.
TABLE 1 chemical composition (wt%) of welding wire of examples and comparative example 316LN stainless steel
In table 1, the balance is Fe and inevitable impurities.
TABLE 2 comparison of the properties of the inventive example and the comparative 316LN stainless steel wire
As can be seen from Table 2, the strength performance of the high-nitrogen 316LN stainless steel welding wire produced by the invention is superior to that of the conventional 316LN stainless steel welding wire, the tensile strength reaches 580-665MPa, and the yield strength reaches 265-310 MPa.
Claims (10)
1. A high-nitrogen 316LN stainless steel welding wire is characterized in that the 316LN stainless steel welding wire comprises the following chemical components by mass percent: less than or equal to 0.03 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, and Ni: 12.0-15.0%, Cr: 16.0-18.0%, Mo: 2.0-3.0%, N: 0.20-0.30%, and the balance of Fe and inevitable impurities.
2. The high-nitrogen 316LN stainless steel welding wire of claim 1, wherein the content of N in the 316LN stainless steel welding wire is 0.25-0.30% by mass.
3. The high nitrogen 316LN stainless steel welding wire of claim 2, wherein the yield strength of the 316LN stainless steel welding wire is 265-310MPa, and the tensile strength is 580-665 MPa.
4. A method for producing a high nitrogen 316LN stainless steel wire according to any one of claims 1 to 3, comprising the steps of smelting, electroslag remelting, homogenization treatment, forging, wire rod rolling, pickling, annealing and drawing, characterized in that nitrogen increasing treatment is performed during annealing.
5. The method for producing the high-nitrogen 316LN stainless steel welding wire as claimed in claim 4, wherein said smelting process uses non-vacuum induction furnace smelting.
6. The method for producing a high-nitrogen 316LN stainless steel wire as claimed in claim 5, wherein said homogenizing step is performed at 1050-1100 ℃ for 4-5 hours.
7. The method for producing the high-nitrogen 316LN stainless steel welding wire as claimed in claim 6, wherein the forging process is performed at a forging temperature of 900-1100 ℃.
8. The production method of the high-nitrogen 316LN stainless steel welding wire as claimed in claim 7, wherein said wire rod rolling process soaks for 1-1.5 h at 1040-1060 ℃, and rolls into wire rod with diameter of 5.45-5.55 mm, and the diameter of wire rod is 80-100 mm.
9. The method for producing the high-nitrogen 316LN stainless steel welding wire according to any of claims 4-8, wherein the annealing and drawing process, drawing and annealing are performed alternately, the drawing pass is 5 times, the annealing times are 4 times, the annealing heating temperature is 1050-1100 ℃, and the coiling speed of the wire rod is 2-4 m/min.
10. The production process of the high-nitrogen 316LN stainless steel welding wire as claimed in claim 9, wherein the nitrogen increasing treatment is nitrogen gas flow in a tube annealing furnace, and the nitrogen gas flow is 10-20L/min.
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Cited By (2)
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