CN114875303B - Hot-rolled wire rod for annealing-free gas-shielded welding wire and preparation method thereof - Google Patents
Hot-rolled wire rod for annealing-free gas-shielded welding wire and preparation method thereof Download PDFInfo
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
- 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
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention relates to a hot rolled wire rod for an annealing-free gas shield welding wire and a preparation method thereof, belonging to the field of steel preparation. The hot-rolled wire rod for the annealing-free gas-shielded welding wire is characterized in that: the hot rolled wire rod comprises the following chemical components in percentage by weight: c: 0.06-0.09%, si:0.80 to 0.95 percent, mn:1.40 to 1.55 percent, P is less than or equal to 0.020 percent, S:0.008 to 0.020 percent, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo, less than or equal to 0.020 percent of V, less than or equal to 0.010 percent of Al, less than or equal to 0.015 percent of As, less than or equal to 0.0015 percent of Ca and the balance of Fe. The annealing-free gas-shielded welding wire ER50-6E-ZJ chemical components and the working procedure parameters in the production process are designed for the first time, the microstructure proportion is regulated and controlled through the alloy components and the process combination, and the annealing-free process is realized in the subsequent drawing process of the hot rolled wire rod for producing the gas-shielded welding wire by using the blank with the same component.
Description
Technical Field
The invention relates to a hot rolled wire rod for an annealing-free gas shield welding wire and a preparation method thereof, belonging to the field of steel preparation.
Background
The hot rolled wire rod for the gas shield welding wire needs to be subjected to an annealing heat treatment process in the process of subsequently drawing to 0.8mm, and the process cost is increased. In order to meet the demands of users, the annealing-free drawing process is realized by the overall production process to produce the hot rolled wire rod ER50-6E-ZJ for the gas-shielded welding wire. The prior art comprises the following steps: the Chinese patent 'a new process for producing a low-carbon gas-shielded welding wire' of patent application number 201310731644.3 discusses that the whole raw material and the subsequent processing process control the iron scale to improve the whole production efficiency. The wire rod is drawn to below 0.8mm in a non-annealing state, and the smooth production is ensured. This technique lacks profiling of the raw material production process.
Disclosure of Invention
The invention relates to the field of production and manufacturing of hot rolled wire rods for gas-shielded welding wires, in particular to a manufacturing method of an annealing-free hot rolled wire rod ER50-6E-ZJ for gas-shielded welding wires. The invention utilizes one chemical component, realizes the regulation and control of the proportion of the microstructure through process combination, and ensures that the hot rolled wire rod for producing the gas-shielded welding wire by using the blank with the same component realizes the annealing-free process in the subsequent drawing process.
The hot-rolled wire rod for the annealing-free gas-shielded welding wire comprises the following chemical components in percentage by weight: the hot rolled wire rod comprises the following chemical components in percentage by weight: c: 0.06-0.09%, si:0.80 to 0.95 percent, mn:1.40 to 1.55 percent, P is less than or equal to 0.020 percent, S:0.008 to 0.020 percent, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo, less than or equal to 0.020 percent of V, less than or equal to 0.010 percent of Al, less than or equal to 0.015 percent of As, less than or equal to 0.0015 percent of Ca and the balance of Fe.
The hot-rolled wire rod for the annealing-free gas-shielded welding wire has the tensile strength of 480 MPa-530 MPa, the elongation after fracture of 28-35% and the reduction of area of 75-85%.
The invention also aims to provide a preparation method of the hot rolled wire rod for the annealing-free gas-shielded welding wire.
The preparation method of the hot rolled wire rod for the annealing-free gas-shielded welding wire comprises the steps of converter smelting, refining, continuous casting, heating, dephosphorization, rolling and cooling, wherein the steps of converter smelting are as follows: the loading amount is 165-180 t/furnace, the end point C is controlled below 0.05 percent, and 10.5kg/t of steel and 15.5kg/t of low-carbon ferromanganese are added; the tapping composition requirement of the converter is as follows: less than or equal to 0.05 percent of C, less than or equal to 0.78 percent of Si, less than or equal to 0.88 percent, less than or equal to 1.35 percent of Mn, less than or equal to 1.50 percent of P, less than or equal to 0.015 percent of P, less than or equal to 0.030 percent of S, less than or equal to 0.20 percent of Cr, less than or equal to 0.30 percent of Ni and less than or equal to 0.20 percent of Cu. Cr is less than or equal to 0.018%, ni is less than or equal to 0.018%, cu is less than or equal to 0.013%, mo is less than or equal to 0.004%, V is less than or equal to 0.004%, ca is less than or equal to 0.0005%, al is less than or equal to 0.004%, as is less than or equal to 0.004%, O is less than or equal to 0.0040%, N is less than or equal to 0.0050%, argon blowing time is more than or equal to 5min, start-up furnace argon station outlet temperature is 1595+/-5 ℃, and continuous casting furnace outlet temperature is 1585+/-5 ℃.
The invention relates to a preparation method of a hot rolled wire rod for an annealing-free gas-shielded welding wire, which comprises the following refining steps: adopting a white slag refining process, alloying 13.1kg/t of low-calcium ferrosilicon steel, and carrying out soft blowing for more than or equal to 12min, carbonizing 100-140 kg/furnace of rice hulls, starting up an LF furnace to reach a station temperature of 1575+/-10 ℃, and continuously casting the furnace to reach a station temperature of 1606+/-5 ℃; the arrival temperature of the LF furnace of the continuous casting heat is 1560+/-10 ℃, and the departure temperature of the LF furnace of the continuous casting heat is 1578+/-5 ℃.
The invention relates to a preparation method of a hot rolled wire rod for an annealing-free gas-shielded welding wire, which comprises the following steps of: the tundish is baked for more than 3 hours, the crystallizer adopts FDK-1 covering slag, the tundish adopts a low-carbon covering agent, electromagnetic stirring current 240A/5 HZ/positive and negative rotation is carried out, and terminal current 250A/6 HZ/is continuous; the specific water quantity k value of the secondary cooling water is set to be 1.0 in the zero section and the three sections, and the primary section and the secondary section are set to be 1.2; the temperature of the tundish is set to be zero-section less than or equal to 1551 ℃, three-section more than 1571 ℃, 1552-section less than or equal to 1561 ℃, 1562-section less than or equal to 1571 ℃; the constant pulling rate is 2.4m/min.
The invention relates to a preparation method of a hot rolled wire rod for an annealing-free gas-shielded welding wire.
The preparation method of the hot rolled wire rod for the annealing-free gas-shielded welding wire comprises the following heating steps: internal control requirements are as follows: the preheating section temperature is 880+/-50 ℃, the heating section temperature is 1100+/-50 ℃, and the soaking section temperature is 1120+/-30 ℃.
The invention relates to a preparation method of a hot rolled wire rod for an annealing-free gas-shielded welding wire, which comprises the following heating steps of: and (5) normally charging for 1.5-2.5 hours. The heating time of the preheating section is 0.6-0.9 h, the heating time of the heating section is 0.6-0.9 h, and the heating time of the soaking section is 0.3-0.7 h.
The invention relates to a preparation method of a hot rolled wire rod for an annealing-free gas-shielded welding wire, which comprises the following rolling steps: the billet is subjected to rough rolling, intermediate rolling, pre-finish rolling and finish rolling after being subjected to scale removal by high-pressure water. The rolling speed is 90m/s, and the elongation coefficient of the last rolling is 1.23. Temperature internal control requirement: rough rolling is carried out at a 1 frame inlet 1010+/-20 ℃, finish rolling inlet 880+/-30 ℃ and spinning 880-910 ℃.
The invention relates to a preparation method of a hot rolled wire rod for an annealing-free gas-shielded welding wire, which comprises the following cooling steps: the adopted process is a delayed type Steyr cooling process, and the cooling speed is controlled below 1 ℃/s.
The beneficial effects of the invention are as follows: the invention provides a hot rolled wire rod ER50-6E-ZJ for an annealing-free gas shield welding wire and a preparation method thereof. The chemical components of the annealing-free gas-shielded welding wire ER50-6E-ZJ and the process parameters in the production process are designed for the first time. The microstructure proportion is regulated and controlled through the combination of alloy components and the process, so that the hot rolled wire rod for the gas-shielded welding wire produced by using the blank with the same component is ensured to realize the annealing-free process in the subsequent drawing process.
The invention has the following advantages: the aim of one material for multiple purposes is fulfilled according to different customer needs, differential management is realized, and customer satisfaction is increased; the research of the new process lays a technical foundation for the improvement of other steel types; the broken wire rate of customer processing is reduced by 75%; the processing cost is saved by about 100 yuan/ton for the customer.
Drawings
FIG. 1 is a graph of the dynamic CCT of ER50-6E-ZJ of a hot rolled wire rod for an annealing-free gas shield welding wire, and a set temperature system is comprehensively constructed according to the graph of the dynamic CCT of ER50-6E-ZJ. So that the ideal microstructure is generated.
Fig. 2 (a) and (b) are metallographic structure diagrams of wire rods, and the microstructure is f+p, wherein the ferrite content is more than 80%. Ensuring good processing performance and service performance.
Detailed Description
The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.
The test methods described in the following examples, unless otherwise specified, are all conventional; the reagents and materials, unless otherwise specified, are commercially available.
One of the specific embodiments is as follows:
the hot-rolled wire rod for the annealing-free gas-shielded welding wire comprises the following chemical components in percentage by weight: the hot rolled wire rod comprises the following chemical components in percentage by weight: c: 0.06-0.09%, si:0.80 to 0.95 percent, mn:1.40 to 1.55 percent, P is less than or equal to 0.020 percent, S:0.008 to 0.020 percent, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo, less than or equal to 0.020 percent of V, less than or equal to 0.010 percent of Al, less than or equal to 0.015 percent of As, less than or equal to 0.0015 percent of Ca and the balance of Fe.
The tensile strength of the hot rolled wire rod is 480-530 MPa, the elongation after fracture is 28-35%, and the area shrinkage is 75-85%.
A preparation method of hot rolled wire rod for annealing-free gas-shielded welding wire comprises the following process steps:
1. smelting
Desulfurizing station- & gt converter- & gt refining- & gt continuous casting (electromagnetic stirring)
1.1 desulfurization: the desulfurization rate of the converter process is 30-60%, so that the requirement of molten iron S in the converter process is met, and a direct supply mode can be adopted; if the molten iron S is too high, desulfurization pretreatment is needed, and the passivated magnesium metal is used as a desulfurizing agent, so that desulfurization is carried out in the ladle by a spray method.
1.2 converter smelting: the steelmaking process mainly realizes the removal of C, P, S, gas and impurities, deoxidization alloying and proper temperature control. The loading amount is 165-180 t/furnace, the end point C is controlled below 0.05 percent, and 10.5kg/t of steel and 15.5kg/t of low-carbon ferromanganese are added. The tapping composition requirement of the converter is as follows: less than or equal to 0.05 percent of C, less than or equal to 0.78 percent of Si, less than or equal to 0.88 percent, less than or equal to 1.35 percent of Mn, less than or equal to 1.50 percent of P, less than or equal to 0.015 percent of P, less than or equal to 0.030 percent of S, less than or equal to 0.20 percent of Cr, less than or equal to 0.30 percent of Ni and less than or equal to 0.20 percent of Cu. Cr is less than or equal to 0.018%, ni is less than or equal to 0.018%, cu is less than or equal to 0.013%, mo is less than or equal to 0.004%, V is less than or equal to 0.004%, ca is less than or equal to 0.0005%, al is less than or equal to 0.004%, as is less than or equal to 0.004%, O is less than or equal to 0.0040%, and N is less than or equal to 0.0050%. Argon blowing time is more than or equal to 5min, the start-up furnace argon station outlet temperature is 1595+/-5 ℃, and the continuous casting furnace outlet temperature is 1585+/-5 ℃.
1.3 refining: a ladle, a water-cooled furnace cover, an electrode heating system, an alloy feeding system and a dust removing system device which adopt a bottom argon blowing stirring device. Under the condition of maintaining the ladle reducing atmosphere, the electric arc is used for heating the high-alkalinity furnace slag, and a series of furnace slag refining such as deoxidization, desulfurization and the like are completed while slagging. Adopts a white slag refining process and adopts low-calcium ferrosilicon alloying, and the soft blowing time is more than or equal to 12min. 100-140 kg/furnace of carbonized rice hulls, starting an LF furnace, wherein the arrival temperature of the LF furnace is 1575+/-10 ℃, and the arrival temperature of a continuous casting furnace is 1606+/-5 ℃; the arrival temperature of the LF furnace of the continuous casting furnace is 1560+/-10 ℃, and the departure temperature of the LF furnace of the continuous casting furnace is 1578+/-5 ℃.
1.4 continuous casting: the tundish is baked for more than 3 hours. The crystallizer adopts FDK-1 covering slag, the tundish adopts a low-carbon covering agent, the electromagnetic stirring current 240A/5 HZ/is in forward and reverse rotation, and the terminal current 250A/6 HZ/is continuous; the specific water quantity k value of the secondary cooling water is set to be 1.0 in the zero section and the three sections, and the primary section and the secondary section are set to be 1.2. The temperature of the tundish is set to be equal to or less than 1551 ℃ in a zero section, more than 1571 ℃ in a three section, equal to or less than 1561 ℃ in a 1552 ℃ and equal to or less than 1571 ℃ in a 1562 ℃ and equal to or less than 1571 ℃ in a two-section. The constant pulling rate is 2.4m/min.
2. Controlled rolling and cooling
Heating, descaling by high-pressure water, rolling and cooling control
2.1 heating system of heating furnace:
the heating temperature plays an important role in the prior austenite grain size before rolling, the rolling temperature and the finishing temperature, and also plays an important role in the austenite recrystallization degree between the passes and after finishing and the grain size after recrystallization. Internal control requirements are as follows: the preheating section temperature is 880+/-50 ℃, the heating section temperature is 1100+/-50 ℃, and the soaking section temperature is 1120+/-30 ℃;
the heating furnace adopted by the production line is a walking beam type heating furnace which heats up and down. For ER50-6E-ZJ steel, the Si and Mn contents in the steel are high, so that the heating time is not excessively long in order to prevent overheat decarburization during heating; in order to ensure the mechanical properties of the product during batch rolling, the furnace time is as follows: normally charging for 1.5-2.5 h, heating time of a preheating section for 0.6-0.9 h, heating time of a heating section for 0.6-0.9 h, and heating time of a soaking section for 0.3-0.7 h.
2.2, the requirement of the high-pressure water dephosphorization water pressure is more than or equal to 17MPa; ensures the dephosphorization effect, namely after descaling, no visible residual iron oxide scale exists on the surface of the billet.
2.3 rolling temperature control:
the initial rolling temperature influences the nucleation rate of recrystallization and the growth speed of the crystal grains by influencing the energy storage and the crystal boundary migration after the crystal grains are deformed, so that the average crystal grain size after the crystal grains grow is influenced, the phase change temperature is changed, and the tissue morphology is influenced; the finishing temperature directly affects the austenite grain size, thereby affecting the transformation of the structure and the state of the transformation product in the phase transformation process. The relationship between the finish rolling temperature and the grain size is that grains become coarse as the finish rolling temperature increases; for Si-Mn alloy welding wire steel, the important point of the quality control of the steel grade is that the size of austenite grains before transformation and the wire-spinning temperature are important parameters for determining the phase transformation starting temperature, and the wire-spinning temperature has important influence on the stability of supercooled austenite and the product performance. The rolling speed is 90m/s, and the elongation coefficient of the last rolling is 1.23. Internal control requirements are as follows: the inlet of the 1 frame is 1010+/-20 ℃, the finish rolling inlet is 880+/-30 ℃, and the spinning temperature is 880-910 ℃.
2.4 post-roll Cooling Process control
The cooling speed of the phase change region is the key point of cooling control, and is a main factor for determining the austenite decomposition transition temperature and time, and is also a key factor for influencing the final structure morphology of the wire rod. In order to obtain more ferrite grains, ER50-6E-ZJ steel is slowly cooled by adopting a delayed type Steyr cooling process. The cooling speed is controlled below 1 ℃/s. The 1-11 # fan and the air door are closed, the speed of the roller way at the head of the air cooling roller way is 0.09-0.12 m/s, the speed of the roller way is increased by 0-5%, the 1-2 # heat preservation cover is opened in 5-9 months, and the 3-16 # heat preservation cover is closed; the heat preservation cover 1# is opened for 10 to 4 months, and the heat preservation cover 2# to 16# is closed.
2.5 setting a heat preservation channel: the door and window of the heat preservation channel where the PF line is positioned is closed in 11-3 months so as to ensure that the temperature is higher than 60 ℃.
3. Microstructure of microstructure
The alloy weld line steel requires good plasticity and moderate strength, and the structure is ferrite and pearlite, and martensite, bainite and Wittig body structures with poor plasticity are not allowed. Ferrite structure accounts for more than 80%, and grain size is 8.0-9.0 grade.
4. Mechanical properties
The low-carbon low-alloy welding wire steel wire rod is generally used for deep processing and drawing, so the performance requirements of the wire rod are low strength and good extensibility, and the key point of the ER50-6E-ZJ steel controlled cooling process is that austenite is decomposed to have a better transformation temperature and a long enough transformation time so as to obtain enough ferrite and a small amount of pearlite tissues, so that the plasticity and toughness of the welding wire steel are increased as much as possible, the strength is reduced, and better drawing and welding performances are obtained.
The tensile strength is less than or equal to 480MPa and less than or equal to 530MPa, the elongation after fracture is less than or equal to 28 percent and less than or equal to 35 percent, and the area shrinkage is less than or equal to 75 percent and less than or equal to 85 percent.
Example 1
1. Chemical composition%
Hot rolled wire rod ER50-6E-ZJ for annealing-free gas shielded welding wire has a specification of 6.5mm.
The hot rolled wire rod comprises the following chemical components in percentage by weight: c:0.085%, si:0.82%, mn:1.42%, P:0.017%, S:0.013%, cr:0.0297%, ni:0.0109%, cu:0.0105%. Mo:0.0018%, V0.0027%, al 0.002%, as 0.0007%, ca 0.0001% and the balance Fe.
1.1 desulfurization
Direct supply molten iron is adopted.
1.2 converter smelting:
smelting number is 2C30792, loading amount is 178.6 t/furnace, end point C is controlled below 0.041%, and 10.5kg/t steel of silicomanganese alloy and 15.5kg/t steel of low-carbon ferromanganese are added. The tapping composition requirement of the converter is as follows: 0.049% of C, 0.08% of Si, 1.46% of Mn, 0.014% of P, 0.035% of S, 0.020% of Cr, 0.019% of Ni, 0.012% of Cu, 0.006% of Mo, 0.007% of V, 0.0007% of Ca, 0.005% of Al, 0.006% of As, 0.0047% of O and 0.0056% of N. Argon blowing time is 6min, and the outlet temperature of the continuous casting furnace at the argon station is 1582 ℃.
1.3 refining:
the smelting number is 2C30792, the lime is 1200kg, the fluorite is 100kg, the medium-manganese ferrosilicon is 250kg, and the low-calcium ferrosilicon is 1700kg. Adopting a white slag refining process, and carrying out soft blowing for 14min. 130kg of carbonized rice hulls, wherein the arrival temperature of an LF furnace is 1576 ℃, and the departure temperature is 1580 ℃. The arrival temperature of the LF furnace of the continuous casting furnace is 1560 ℃, and the departure temperature of the LF furnace of the continuous casting furnace is 1583 ℃.
1.4 continuous casting:
the tundish is guaranteed to bake for 3.5 hours. The crystallizer adopts FDK-1 covering slag, the tundish adopts a low-carbon covering agent, the electromagnetic stirring current 240A/5 HZ/is in forward and reverse rotation, and the terminal current 250A/6 HZ/is continuous; the k value of the secondary cooling water ratio water is 1.0 in the zero section and the three sections, and the primary section and the secondary section are 1.2. The temperature of the tundish is zero 1545 ℃, three 1574 ℃, one 1556 ℃, and two 1564 ℃, and the superheat degree is 30 ℃. The constant pulling rate is 2.4m/min.
2. Controlled rolling and cooling
2.1 heating System of heating furnace
The preheating section 870 ℃, the heating section 1090 ℃, the soaking section 1130 ℃ and the furnace time of 2.5h, wherein the heating time of the preheating section is 0.9h, the heating time of the heating section is 0.9h and the heating time of the soaking section is 0.7h.
2.2 high pressure water dephosphorization water pressure 18MPa.
2.3 Rolling temperature control
1 frame inlet 1010 ℃, finish rolling inlet 870 ℃, spinning 890 ℃.
2.4 post-roll Cooling Process control
The fan and the air door are closed in the 1# to 11# mode, the speed of the roller way at the head of the air cooling roller way is 0.10m/s, the roller way is increased by 3%, the heat-preserving cover in the 1# mode is opened, the heat-preserving cover in the 2# to 16# mode is closed, the cooling speed is 0.8 ℃/s, and the door and window of the heat-preserving channel is closed to realize tissue phase change.
3. Microstructure of microstructure
Ferrite and a small amount of pearlite (ferrite structure ratio 86-90%), and grain size 8.5-9.0.
4. Mechanical properties
The tensile strength is controlled to be 497 MPa-515 MPa, the elongation after fracture is controlled to be 29.5-33%, and the area shrinkage is controlled to be 79-83%.
Claims (5)
1. The hot-rolled wire rod for the annealing-free gas-shielded welding wire is characterized in that: the hot rolled wire rod comprises the following chemical components in percentage by weight: c:0.085%, si:0.82%, mn:1.42%, P:0.017%, S:0.013%, cr:0.0297%, ni:0.0109%, cu:0.0105%, mo:0.0018%, 0.0027%, 0.002% Al, 0.0007% As, 0.0001% Ca and the balance Fe,
the tensile strength of the hot rolled wire rod is controlled to be 497 MPa-515 MPa, the elongation after fracture is controlled to be 29.5-33%, the area shrinkage is controlled to be 79-83%,
the hot rolled wire rod for the annealing-free gas-shielded welding wire is prepared by the following method: the method comprises the steps of converter smelting, refining, continuous casting, heating, dephosphorization, rolling and cooling,
the heating furnace adopted in the heating step is a walking beam type heating furnace which is heated up and down, and the internal control requirement is as follows: the preheating section temperature is 880+/-50 ℃, the heating section temperature is 1100+/-50 ℃, and the soaking section temperature is 1120+/-30 ℃; normally charging for 1.5-2.5 h, wherein the heating time of the preheating section is 0.6-0.9 h, the heating time of the heating section is 0.6-0.9 h, and the heating time of the soaking section is 0.3-0.7 h;
the rolling step comprises the following steps: after descaling by high-pressure water, rough rolling, intermediate rolling, pre-finish rolling and finish rolling are carried out on the billet, the rolling speed is 90m/s, and the elongation coefficient of the last rolling is 1.23; temperature internal control requirement: rough rolling is carried out at a 1 frame inlet 1010+/-20 ℃, finish rolling inlet 880+/-30 ℃ and spinning 880-910 ℃.
2. The hot rolled wire rod for an annealing-free gas shielded welding wire according to claim 1, wherein: the converter smelting steps are as follows: the loading amount is 165-180 t/furnace, the end point C is controlled below 0.05 percent, and 10.5kg/t of steel and 15.5kg/t of low-carbon ferromanganese are added; the tapping composition requirement of the converter is as follows: less than or equal to 0.05% of C, less than or equal to 0.78% of Si, less than or equal to 0.88% of Mn, less than or equal to 1.50% of P, less than or equal to 0.015% of S, less than or equal to 0.030% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.30% of Ni, less than or equal to 0.20% of Cu, less than or equal to 0.018% of Cr, less than or equal to 0.018% of Ni, less than or equal to 0.013% of Cu, less than or equal to 0.004% of Mo, less than or equal to 0.004% of V, less than or equal to 0.0005% of Ca, less than or equal to 0.004% of Al, less than or equal to 0.004% of As, less than or equal to 0.0050% of [ O ], argon blowing time of less than or equal to 5min, and a start-up argon station outlet temperature of 1595+/-5 ℃ and a continuous casting outlet temperature of 1585 ℃.
3. The hot rolled wire rod for an annealing-free gas shielded welding wire according to claim 1, wherein: the refining steps are as follows: adopting a white slag refining process, alloying 13.1kg/t of low-calcium ferrosilicon steel, and carrying out soft blowing for more than or equal to 12min, carbonizing 100-140 kg/furnace of rice hulls, starting up an LF furnace to reach a station temperature of 1575+/-10 ℃, and continuously casting the furnace to reach a station temperature of 1606+/-5 ℃; the arrival temperature of the LF furnace of the continuous casting heat is 1560+/-10 ℃, and the departure temperature of the LF furnace of the continuous casting heat is 1578+/-5 ℃.
4. The hot rolled wire rod for an annealing-free gas shielded welding wire according to claim 3, wherein: the continuous casting comprises the following steps: the tundish is baked for more than 3 hours, the crystallizer adopts FDK-1 covering slag, the tundish adopts a low-carbon covering agent, electromagnetic stirring current 240A/5 HZ/positive and negative rotation is carried out, and terminal current 250A/6 HZ/is continuous; the specific water quantity k value of the secondary cooling water is set to be 1.0 in the zero section and the three sections, and the primary section and the secondary section are set to be 1.2; the temperature of the tundish is set to be zero-section less than or equal to 1551 ℃, three-section more than 1571 ℃, 1552-section less than or equal to 1561 ℃, 1562-section less than or equal to 1571 ℃; the constant pulling rate is 2.4m/min.
5. The hot rolled wire rod for an annealing-free gas shielded welding wire according to claim 1, wherein: the cooling step is as follows: the adopted process is a delayed type Steyr cooling process, and the cooling speed is controlled below 1 ℃/s.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984121A (en) * | 2010-12-09 | 2011-03-09 | 宣化钢铁集团有限责任公司 | Steel wire rod for 600MPa-grade high-strength welding wire and production process thereof |
| CN102513725A (en) * | 2011-12-13 | 2012-06-27 | 南京钢铁股份有限公司 | Steel wire rod for annealing-free solder wire and production process thereof |
| CN103753056A (en) * | 2013-12-24 | 2014-04-30 | 天津钢铁集团有限公司 | Novel process for producing low carbon gas shielded welding wire |
| CN107009047A (en) * | 2017-04-02 | 2017-08-04 | 首钢总公司 | A kind of high-strength steel gas shielded arc welding solid welding wire |
| JPWO2017115842A1 (en) * | 2015-12-28 | 2018-11-01 | 新日鐵住金株式会社 | Case-hardened steel, carburized parts and method for producing case-hardened steel |
| CN110241356A (en) * | 2019-05-09 | 2019-09-17 | 唐山市德龙钢铁有限公司 | A kind of welding wire gren rod and preparation method thereof |
| JP6597945B1 (en) * | 2018-03-13 | 2019-10-30 | 日本製鉄株式会社 | Steel |
| CN114131240A (en) * | 2021-09-23 | 2022-03-04 | 江阴兴澄合金材料有限公司 | Wire rod for pipeline steel gas shielded welding wire and manufacturing method thereof |
-
2022
- 2022-03-28 CN CN202210315915.6A patent/CN114875303B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984121A (en) * | 2010-12-09 | 2011-03-09 | 宣化钢铁集团有限责任公司 | Steel wire rod for 600MPa-grade high-strength welding wire and production process thereof |
| CN102513725A (en) * | 2011-12-13 | 2012-06-27 | 南京钢铁股份有限公司 | Steel wire rod for annealing-free solder wire and production process thereof |
| CN103753056A (en) * | 2013-12-24 | 2014-04-30 | 天津钢铁集团有限公司 | Novel process for producing low carbon gas shielded welding wire |
| JPWO2017115842A1 (en) * | 2015-12-28 | 2018-11-01 | 新日鐵住金株式会社 | Case-hardened steel, carburized parts and method for producing case-hardened steel |
| CN107009047A (en) * | 2017-04-02 | 2017-08-04 | 首钢总公司 | A kind of high-strength steel gas shielded arc welding solid welding wire |
| JP6597945B1 (en) * | 2018-03-13 | 2019-10-30 | 日本製鉄株式会社 | Steel |
| CN110241356A (en) * | 2019-05-09 | 2019-09-17 | 唐山市德龙钢铁有限公司 | A kind of welding wire gren rod and preparation method thereof |
| CN114131240A (en) * | 2021-09-23 | 2022-03-04 | 江阴兴澄合金材料有限公司 | Wire rod for pipeline steel gas shielded welding wire and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王磊.《棒线材生产实训指导》.冶金工业出版社,2016,1-5. * |
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