Processing technology of steel strip for preparing high manganese austenite low temperature steel flux-cored welding wire

Abstract

The invention relates to a processing technology for preparing a steel strip for high manganese austenite low temperature steel flux-cored welding wire. The technical scheme comprises the following steps: polishing and grinding a high manganese austenite low temperature steel hot rolled strip, cold rolling, welding and coiling the strip; then performing four annealing heat treatments and cold rolling, and finally performing one annealing heat treatment: the temperatures (°C) of the five annealing heat treatments are 950-1080, 980-1100, 970-1060, 950-1040, 980-1020, the heat preservation time is 0.5-1.0 hour, and the protective atmosphere is hydrogen; the cooling rates (°C / min) are 100-120, 120-140, 140-160, 240-260, 280-300, the thicknesses (mm) of the four cold rollings are 1.5-2.3, 0.8-1.5, 0.6-0.8, 0.4-0.6, and trimming is performed to obtain a steel strip for preparing a high manganese austenite low temperature steel flux cored welding wire. The invention has simple ingredients, low powder filling rate and high production efficiency. The manufactured product is suitable for all high manganese austenite low temperature steel flux cored welding wires and meets the technical requirements for preparing high manganese austenite low temperature steel matching flux cored welding wires.

Description

Technical Field

[0001] The invention belongs to the technical field of steel strip for high manganese austenite low temperature steel flux-cored welding wire, and specifically relates to a steel strip for preparing high manganese austenite low temperature steel flux-cored welding wire and a processing technology thereof. Background Art

[0002] High manganese austenitic low-temperature steel, with its excellent comprehensive mechanical properties and ultra-low temperature performance, as well as significant economy, will become the steel material for LNG storage tanks to replace expensive 9Ni steel and Cr-Ni austenitic stainless steel. Flux-cored wire is one of the commonly used welding materials for the construction of LNG storage tanks using high manganese austenitic low-temperature steel welding. Flux-cored wire consists of two parts: steel strip + powder. The steel strip mainly plays the role of coating the powder, and also plays the role of a transition alloy element. It is also one of the key links that determine the production, quality and performance of flux-cored wire. Therefore, the composition of the high manganese austenitic low-temperature steel flux-cored welding wire steel strip and the filling rate of the production welding wire have been of concern to those skilled in the art:

[0003] The patented technology of "A seamless submerged arc flux-cored welding wire for high manganese steel LNG storage tank welding" (201911049624.1) adopts a low-carbon steel strip as the outer skin, and the mass percentage of the elements contained is: C≤0.06%, Si≤0.02%, Mn is 0.1-0.4%, S≤0.01%, P≤0.015%, Fe≥98%; although this technology has its advantages, the filling rate of the seamless submerged arc flux-cored welding wire needs to be as high as 30-40% to meet the total amount of alloy elements (Mn+Cr+Mo+C) in the deposited metal to reach the range of 33-35%.

[0004] The patented technology "Flux-cored welding wire for ultra-low temperature high manganese steel suitable for all-position welding and its application" (202110816857.0) uses low-carbon steel strips for the steel strips, and the filling rate needs to reach 35-45%. However, the current filling rate limit of the flux-cored welding wire production line is 30-33%, that is, it is impossible to produce high-manganese austenitic low-temperature steel flux-cored welding wire using low-carbon steel strips on the existing flux-cored welding wire production line.

[0005] Regarding the composition system of the steel strip of high manganese austenitic low temperature steel flux-cored welding wire, the disclosed technologies include: "A high-efficiency submerged arc welding metal powder core flux-cored welding wire suitable for ultra-low temperature high manganese steel" (201811602479.0) patent technology, the chemical composition of the steel strip is: C is 0.20-0.23wt%, Si is 0.03-0.05wt%, Mn is 6-8wt%, P≤0.002wt%, S≤0.001wt%, and the balance is Fe and unavoidable impurities. Although this technology increases the manganese content in the steel strip, when the alloy components of Mn are 6-8wt% and C are 0.20-0.23wt%, the room temperature structure of the steel ingot is a hard and brittle martensitic structure, which is easy to break during the forging and rolling of the steel ingot, and then the cold rolling into the steel strip and the wire drawing process, which brings great difficulty to the production of high manganese austenitic low temperature steel steel strip and flux-cored welding wire finished products.

[0006] Regarding the production process of steel strip, the disclosed patent technologies include "Cold-rolled steel strip for flux-cored welding wire and its manufacturing method" (201110055535.5) and "Cold-rolled steel strip for flux-cored welding wire and its manufacturing method" (201010598203.7). The above technologies provide a manufacturing method for low-carbon steel strip, but its annealing heat treatment temperature, holding time and number of heat treatments cannot produce steel strip suitable for high-manganese austenitic low-temperature steel. Summary of the invention

[0007] The present invention aims to overcome the deficiencies of the prior art and has the object of providing a processing technology for preparing a steel strip for high manganese austenitic low temperature steel flux-cored welding wire, which has a simple composition, a low powder filling rate and a high production efficiency. The steel strip for preparing high manganese austenitic low temperature steel flux-cored welding wire obtained by the process is suitable for all high manganese austenitic low temperature steel flux-cored welding wires and can meet the technical requirements for preparing flux-cored welding wires matching high manganese austenitic low temperature steel.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] Step 1: Cold rolling

[0010] The high manganese austenitic low temperature steel hot-rolled strip of (3.5-4.0) mm×176 mm is ground and polished, cold-rolled to (2.3-3.5) mm×176 mm, and welded and coiled.

[0011] The chemical composition of the high manganese austenite low temperature steel hot rolled strip is: C is 0.30-0.60wt%, Mn is 26-28wt%, P is less than or equal to 0.002wt%, S is less than or equal to 0.001wt%, and the remainder is Fe and unavoidable impurities.

[0012] Step 2: First annealing heat treatment + cold rolling

[0013] The first annealing heat treatment is carried out under the condition of hydrogen protective atmosphere and temperature of 950-1080°C, and the temperature is kept for 0.5-1.0 hour; then cooled to room temperature at a rate of 100-120°C / min, and then cold rolled to (1.5-2.3) mm×176 mm; and trimmed to (1.5-2.3) mm×170 mm.

[0014] Step 3: Second annealing heat treatment + cold rolling

[0015] The second annealing heat treatment is carried out in a protective atmosphere of hydrogen and a temperature of 980-1100°C for 0.5-1.0 hour; then cooled to room temperature at a rate of 120-140°C / min, and then cold rolled to (0.8-1.5) mm×170 mm.

[0016] Step 4: Third annealing heat treatment + cold rolling

[0017] The third annealing heat treatment is carried out in a protective atmosphere of hydrogen and a temperature of 970-1060°C for 0.5-1.0 hour; then cooled to room temperature at a rate of 140-160°C / min, and then cold rolled to (0.6-0.8) mm×170 mm.

[0018] Step 5: Fourth annealing heat treatment + cold rolling

[0019] The fourth annealing heat treatment is carried out in a protective atmosphere of hydrogen and a temperature of 950-1040°C for 0.5-1.0 hour; then cooled to room temperature at a rate of 240-260°C / min, and then cold rolled to (0.4-0.6) mm×170 mm.

[0020] Step 6: Fifth annealing heat treatment

[0021] The fifth annealing heat treatment is carried out under the conditions of hydrogen protective atmosphere and temperature of 980-1020°C, with the holding time of 0.5-0.8 hours; then it is cooled to room temperature at a rate of 280-300°C / min, cleaned and dried; the hardness and elongation are tested to be qualified, and the edges are trimmed to (0.4-0.6) mm×(14-18) mm to obtain a steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire.

[0022] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0023] The present invention is based on the fact that high manganese austenitic low temperature steel has severe work hardening due to TWIP as the main deformation mechanism. By formulating a multi-pass cold rolling and multiple annealing process, annealing is performed after each cold rolling to eliminate residual stress and improve its processing performance. The invention solves the severe work hardening caused by the high alloy composition of high manganese austenitic low temperature steel, avoids the steel strip from breaking during the cold rolling process due to excessive single deformation, and effectively solves the problems of forming difficulties.

[0024] The present invention uses a raw material of (3.5-4.0) mm × 176 mm high manganese austenite low temperature steel hot-rolled strip, and undergoes annealing heat treatment for the first to fifth times. The heat treatment temperature is based on the problem of reduced thermoplasticity of high manganese austenite low temperature steel in a certain temperature range (600-900° C.), and it is necessary to avoid this temperature range. Therefore, the annealing temperatures are designed to be 950-1080° C., 980-1100° C., 970-1060° C., 950-1040° C., and 980-1020° C. in sequence, and the annealing temperature is slightly reduced as the steel strip is thinned. The annealing temperature and the rapid cooling process adopted by the present invention avoid the problem of reduced thermoplasticity of high manganese austenite low temperature steel in a certain temperature range.

[0025] The thermal conductivity of high manganese austenite low temperature steel is low, about 1 / 3 of that of carbon steel. Since the solidus temperature of the material is much lower than that of ordinary low alloy steel, the heating and insulation temperature cannot be too high. The insulation time designed by the present invention is 0.5 to 0.8 hours, which shortens the insulation time while ensuring that the thin steel strip is fully heated.

[0026] The invention adopts 1 to 5 annealing heat treatment processes, and then cools to room temperature at rates of 100 to 120° C. / min, 120 to 140° C. / min, 140 to 160° C. / min, 240 to 260° C. / min, and 280 to 300° C. / min in sequence, to obtain a steel strip with a specification of (0.4 to 0.8) mm×(14 to 18) mm, thereby solving the problem of difficult processing of the steel strip, reducing production costs, and improving production efficiency and yield rate while ensuring cold rolling accuracy and surface quality.

[0027] Since high manganese austenite low temperature steel has poor oxidation resistance, oxide scale is easily generated on the surface after conventional annealing treatment, and the material yield rate is low after the polishing process; the present invention adopts hydrogen protection annealing, the surface quality after annealing is good, and the post-polishing process after annealing is omitted, which saves production costs and improves the yield rate, effectively ensuring the cold rolling accuracy and surface quality of the steel strip. The processing technology of the steel strip of the high manganese austenite low temperature steel flux-cored welding wire of the present invention is particularly suitable for manufacturing high manganese austenite low temperature steel flux-cored welding wire, and the welding wire is suitable for building high manganese austenite low temperature steel LNG storage tanks.

[0028] The steel strip for preparing high manganese austenite low temperature steel flux cored welding wire obtained by the invention has the following test results: the yield strength is 300-350MPa; the tensile strength is 450-500MPa; the elongation is 70-80%; the specification is 0.4-0.6mm; and the filling rate is 27-30%.

[0029] The flux-cored welding wire for preparing high manganese austenite low-temperature steel obtained by the invention includes but is not limited to gas-shielded flux-cored welding wire, submerged arc welding flux-cored welding wire, self-shielded flux-cored welding wire, etc., and has a wide range of applications.

[0030] Therefore, the present invention has the characteristics of simple composition, low powder filling rate and high production efficiency. The steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire obtained by the process is suitable for all high manganese austenitic low-temperature steel flux-cored welding wires and can meet the technical requirements for preparing flux-cored welding wires matching high manganese austenitic low-temperature steel. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific implementation methods, which does not limit the scope of protection thereof.

[0032] Example 1

[0033] A processing technology for preparing a steel strip for high manganese austenite low temperature steel flux-cored welding wire. The steps of the processing technology described in this embodiment are:

[0034] Step 1: Cold rolling

[0035] The 3.5mm×176mm high manganese austenitic low-temperature steel hot-rolled strip was ground and polished, cold-rolled to 2.3mm×176mm, and welded and coiled.

[0036] The chemical composition of the high manganese austenite low temperature steel hot rolled strip is: C is 0.49wt%, Mn is 26.8wt%, P is 0.002wt%, S is 0.001wt%, and the balance is Fe and unavoidable impurities.

[0037] Step 2: First annealing heat treatment + cold rolling

[0038] The first annealing heat treatment is carried out under the condition of hydrogen atmosphere and temperature of 950°C for 0.5 hours; then cooled to room temperature at a rate of 120°C / min, and then cold rolled to 1.5mm×176mm; and trimmed to 1.5mm×170mm.

[0039] Step 3: Second annealing heat treatment + cold rolling

[0040] The second annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 980°C for 0.5 hours; then cooled to room temperature at a rate of 140°C / min, and then cold rolled to 0.8mm×170mm.

[0041] Step 4: Third annealing heat treatment + cold rolling

[0042] The third annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 970°C for 0.5 hours; then cooled to room temperature at a rate of 140°C / min, and then cold rolled to 0.6mm×170mm.

[0043] Step 5: Fourth annealing heat treatment + cold rolling

[0044] The fourth annealing heat treatment is carried out under the conditions of hydrogen atmosphere and heat treatment temperature of 950°C for 0.5 hours; then the steel sheet is cooled to room temperature at a rate of 240°C / min, and then cold rolled to 0.4mm×170mm.

[0045] Step 6: Fifth annealing heat treatment

[0046] The fifth annealing heat treatment is carried out under the conditions of hydrogen protective atmosphere and heat treatment temperature of 980°C, and the temperature is kept for 0.5 hours; then it is cooled to room temperature at a rate of 280°C / min, cleaned and dried; the hardness and elongation are tested to be qualified, and the edges are trimmed to 0.4mm×16mm to obtain a steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire.

[0047] The steel strip for preparing high manganese austenite low temperature steel flux-cored welding wire processed in this embodiment was tested to have the following characteristics: yield strength of 300 MPa; tensile strength of 450 MPa; elongation of 80%; specification of 0.4 mm; and filling rate of 30%.

[0048] Example 2

[0049] A processing technology for preparing a steel strip for high manganese austenite low temperature steel flux-cored welding wire. The steps of the processing technology described in this embodiment are:

[0050] Step 1: Cold rolling

[0051] The 3.5mm×176mm high manganese austenitic low-temperature steel hot-rolled strip was ground and polished, cold-rolled to 3.0mm×176mm, and welded and coiled.

[0052] The chemical composition of the high manganese austenite low temperature steel hot rolled strip is: 0.30wt% C, 28wt% Mn, 0.002wt% P, 0.001wt% S, and the remainder is Fe and unavoidable impurities.

[0053] Step 2: First annealing heat treatment + cold rolling

[0054] The first annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 980°C for 0.8 hours; then cooled to room temperature at a rate of 110°C / min; then cold rolled to 1.5mm×176mm and trimmed to 1.5mm×170mm.

[0055] Step 3: Second annealing heat treatment + cold rolling

[0056] The second annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 1000°C for 0.8 hours; then cooled to room temperature at a rate of 130°C / min, and then cold rolled to 1.5mm×170mm.

[0057] Step 4: Third annealing heat treatment + cold rolling

[0058] The third annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 980°C for 0.8 hours; then cooled to room temperature at a rate of 150°C / min, and then cold rolled to 0.6mm×170mm.

[0059] Step 5: Fourth annealing heat treatment + cold rolling

[0060] The fourth annealing heat treatment is carried out under the conditions of hydrogen as the protective atmosphere and a heat treatment temperature of 980°C for 0.8 hours; then the steel sheet is cooled to room temperature at a rate of 250°C / min, and then cold rolled to 0.5mm×170mm.

[0061] Step 6: Fifth annealing heat treatment

[0062] The fifth annealing heat treatment is carried out under the conditions of hydrogen protective atmosphere and heat treatment temperature of 1000°C, and the temperature is kept for 0.6 hours; then it is cooled to room temperature at a rate of 290°C / min, cleaned and dried; the hardness and elongation are tested to be qualified, and the edges are trimmed to 0.5mm×14mm to obtain a steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire.

[0063] The steel strip for preparing the high manganese austenite low temperature steel flux-cored welding wire processed in this embodiment was tested to have the following characteristics: yield strength of 350 MPa; tensile strength of 500 MPa; elongation of 70%; specification of 0.5 mm; and filling rate of 28%.

[0064] Example 3

[0065] A processing technology for preparing a steel strip for high manganese austenite low temperature steel flux-cored welding wire. The steps of the processing technology described in this embodiment are:

[0066] Step 1: Cold rolling

[0067] The 4.0mm×176mm high manganese austenitic low-temperature steel hot-rolled strip was ground and polished, cold-rolled to 3.5mm×176mm, and welded and coiled.

[0068] The chemical composition of the high manganese austenite low temperature steel hot rolled strip is: C is 0.60wt%, Mn is 26wt%, P is 0.001wt%, S is 0.001wt%, and the balance is Fe and inevitable impurities.

[0069] Step 2: First annealing heat treatment + cold rolling

[0070] The first annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 1080°C for 1.0 hour; then cooled to room temperature at a rate of 100°C / min, and then cold rolled to 2.3mm×176mm and trimmed to 1.5mm×170mm.

[0071] Step 3: Second annealing heat treatment + cold rolling

[0072] The second annealing heat treatment is carried out under the condition of hydrogen as the protective atmosphere and the heat treatment temperature of 1100°C, and the temperature is kept for 1.0 hour; then the steel is cooled to room temperature at a rate of 120°C / min, and then cold-rolled to 1.5mm×170mm.

[0073] Step 4: Third annealing heat treatment + cold rolling

[0074] The third annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 1060°C for 1.0 hour; then cooled to room temperature at a rate of 160°C / min, and then cold rolled to 0.8mm×170mm.

[0075] Step 5: Fourth annealing heat treatment + cold rolling

[0076] The fourth annealing heat treatment is carried out under the condition of hydrogen atmosphere and heat treatment temperature of 1040°C for 1.0 hour; then cooled to room temperature at a rate of 260°C / min, and then cold rolled to 0.6mm×170mm.

[0077] Step 6: Fifth annealing heat treatment

[0078] The fifth annealing heat treatment is carried out under the conditions of hydrogen protective atmosphere and heat treatment temperature of 1020°C, and the temperature is kept for 0.8 hours; then it is cooled to room temperature at a rate of 300°C / min, cleaned and dried; the hardness and elongation are tested to be qualified, and the edges are trimmed to 0.6mm×18mm to obtain a steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire.

[0079] The steel strip for preparing high manganese austenite low temperature steel flux-cored welding wire processed in this embodiment was tested to have the following: yield strength of 342 MPa; tensile strength of 492 MPa; elongation of 76%; specification of 0.6 mm; and filling rate of 27%.

[0080] Compared with the prior art, this specific implementation has the following positive effects:

[0081] This specific implementation method is based on the fact that high manganese austenitic low-temperature steel has TWIP as the main deformation mechanism and severe work hardening. By formulating multiple cold rolling and multiple annealing processes, annealing treatment is performed after each cold rolling to eliminate residual stress and improve its processing performance. The problem of severe work hardening caused by the high alloy composition of high manganese austenitic low-temperature steel is solved, and the steel strip is prevented from breaking during the cold rolling process due to excessive single deformation, effectively solving the problem of forming difficulties.

[0082] In this specific implementation, the raw material is (3.5-4.0) mm × 176 mm high manganese austenite low temperature steel hot-rolled strip, which is subjected to five annealing heat treatments. The heat treatment temperature is based on the problem that the thermoplasticity of high manganese austenite low temperature steel decreases within a certain temperature range (600-900°C), and it is necessary to avoid this temperature range. Therefore, the annealing temperatures are designed to be 950-1080°C, 980-1100°C, 970-1060°C, 950-1040°C, and 980-1020°C, respectively, and the annealing temperature is slightly reduced as the steel strip is thinned. The annealing temperature and the rapid cooling process adopted in this specific implementation avoid the problem that the thermoplasticity of high manganese austenite low temperature steel decreases within a certain temperature range.

[0083] The thermal conductivity of high manganese austenitic low-temperature steel is low, about 1 / 3 of that of carbon steel. Since the solidus temperature of this material is much lower than that of ordinary low-alloy steel, the heating and insulation temperature cannot be too high. The insulation time of this specific implementation is designed to be 0.5 to 0.8 hours, which shortens the insulation time while ensuring that the thin steel strip is fully heated.

[0084] This specific implementation adopts 1 to 5 heat treatment processes, and then cools to room temperature at rates of 100 to 120°C / min, 120 to 140°C / min, 140 to 160°C / min, 240 to 260°C / min, and 280 to 300°C / min, to obtain a steel strip with a specification of (0.4 to 0.8) mm × (14 to 18) mm, which solves the problem of difficult processing of the steel strip, reduces production costs, and improves production efficiency and yield rate while ensuring cold rolling accuracy and surface quality.

[0085] Since high manganese austenitic low-temperature steel has poor oxidation resistance, oxide scale is easily generated on the surface after conventional annealing treatment, and the material yield rate is low after the polishing process; this specific implementation adopts hydrogen protection annealing, the surface quality after annealing is good, and the post-polishing process after annealing is omitted, which saves production costs and improves the yield rate, effectively ensuring the cold rolling accuracy and surface quality of the steel strip. The processing technology of the steel strip of the high manganese austenitic low-temperature steel flux-cored welding wire of this specific implementation is particularly suitable for manufacturing high manganese austenitic low-temperature steel flux-cored welding wire, which is suitable for building high manganese austenitic low-temperature steel LNG storage tanks.

[0086] The steel strip for preparing high manganese austenite low temperature steel flux-cored welding wire obtained in this specific implementation method has been tested to have a yield strength of 300-350 MPa, a tensile strength of 450-500 MPa, an elongation of 70-80%, a specification of 0.4-0.6 mm, and a filling rate of 27-30%.

[0087] The flux-cored welding wire for preparing high manganese austenite low-temperature steel obtained in this specific embodiment includes but is not limited to gas-shielded flux-cored welding wire, submerged arc welding flux-cored welding wire, self-shielded flux-cored welding wire, etc., and has a wide range of applications.

[0088] Therefore, this specific embodiment has the characteristics of simple composition, low powder filling rate and high production efficiency. The steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire obtained by this process is suitable for all high manganese austenitic low-temperature steel flux-cored welding wires, and can meet the technical requirements for preparing high manganese austenitic low-temperature steel flux-cored welding wires.

Claims

1. A process for preparing a steel strip for high manganese austenite low temperature steel flux-cored welding wire, characterized in that The steps of the processing technology are: Step 1: Grind and polish the (3.5-4.0) mm × 176 mm high manganese austenite low temperature steel hot-rolled strip, cold-roll it to (2.3-3.5) mm × 176 mm, and weld and coil it; Step 2: First annealing heat treatment + cold rolling The first annealing heat treatment is carried out under the condition of hydrogen atmosphere and temperature of 950-1080°C for 0.5-1.0 hour; then cooled to room temperature at a rate of 100-120°C / min, and then cold rolled to (1.5-2.3) mm×176 mm; trimmed to (1.5-2.3) mm×170 mm; Step 3: Second annealing heat treatment + cold rolling The second annealing heat treatment is carried out under the condition of hydrogen atmosphere and temperature of 980-1100°C for 0.5-1.0 hour; then cooled to room temperature at a rate of 120-140°C / min, and then cold rolled to (0.8-1.5) mm×170 mm; Step 4: Third annealing heat treatment + cold rolling The third annealing heat treatment is carried out under the condition of hydrogen atmosphere and temperature of 970-1060°C, with the holding time of 0.5-1.0 hour; then cooled to room temperature at a rate of 140-160°C / min, and then cold rolled to (0.6-0.8) mm×170 mm; Step 5: Fourth annealing heat treatment + cold rolling The fourth annealing heat treatment is carried out under the condition of hydrogen atmosphere and temperature of 950-1040°C, with the holding time of 0.5-1.0 hour; then cooled to room temperature at a rate of 240-260°C / min, and then cold rolled to (0.4-0.6) mm×170 mm; Step 6: Fifth annealing heat treatment The fifth annealing heat treatment is carried out under the conditions of hydrogen protective atmosphere and temperature of 980-1020°C, with the holding time of 0.5-0.8 hours, and then cooled to room temperature at a rate of 280-300°C / min, cleaned and dried; the hardness and elongation are tested to be qualified, and the edges are trimmed to (0.4-0.6) mm×(14-18) mm to obtain a steel strip for preparing high manganese austenitic low-temperature steel flux-cored welding wire.

2. The processing technology of the steel strip for high manganese austenite low temperature steel flux-cored welding wire according to claim 1 is characterized in that The chemical composition of the high manganese austenite low temperature steel hot rolled strip is: C is 0.30-0.60wt%, Mn is 26-28wt%, P is less than or equal to 0.002wt%, S is less than or equal to 0.001wt%, and the remainder is Fe and unavoidable impurities.