CN110640353A - A kind of welding wire material and preparation method thereof - Google Patents

Abstract

The invention provides a welding wire material, which comprises the following components: 0.35 to 0.55 wt% Mn; 15.5-16 wt% of Cr; 16-16.5 wt% of Mo; co is less than or equal to 0.3 wt%; cu is less than or equal to 0.05 wt%; 5.4-5.8 wt% Fe; 0.15 to 0.2 wt% of V; 3.6-4.2 wt% of W; o is less than or equal to 0.002 wt%; n is less than or equal to 0.005 wt%; p is less than or equal to 0.005 wt%; al is less than or equal to 0.05 wt%; ce is less than or equal to 0.02wt percent; mg is less than or equal to 0.08 wt%; the balance being Ni. The invention manufactures the alloy by optimizing the smelting process, the heating process in the forging and cogging process, the deformation process and the heating process in the rolling process of the alloy with the components

Description

A kind of welding wire material and preparation method thereof

technical field

The invention relates to the technical field of welding, in particular to a welding wire material and a preparation method thereof.

Background technique

The manufacturing technology and market of 9Ni steel related supporting welding consumables are monopolized by a few international multinational companies. At present, the welding materials used in the construction of LNG storage tanks in my country are completely dependent on imports, which makes the fully autonomous production of LNG storage tanks in my country challenged. Compared with the development and industrial production of 9Ni steel and its supporting welding materials abroad, the development of welding technology and welding materials in my country is still in its infancy, and there is no report that domestic 9Ni steel supporting welding materials are used in engineering practice.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a welding wire material and a preparation method thereof, and the welding wire material provided by the present invention can be used together with 9Ni steel.

The invention provides a kind of welding wire material, the composition is:

C≤0.008wt%;

0.35～0.55wt% of Mn;

Si≤0.06wt%;

S≤0.002wt%;

15.5～16wt% Cr;

16～16.5wt% Mo;

Co≤0.3wt%;

Cu≤0.05wt%;

5.4～5.8wt% Fe;

0.15～0.2wt% of V;

3.6～4.2wt% of W;

O≤0.002wt%;

N≤0.005wt%;

P≤0.005wt%;

Al≤0.05wt%;

Ce≤0.02wt%;

Mg≤0.08wt%;

The remainder is Ni.

In the present invention, the mass content of the C is preferably 0.001-0.008%, more preferably 0.002-0.007%. It is more preferably 0.003-0.006%, most preferably 0.004-0.005%; the mass content of Mn is preferably 0.4-0.5%, more preferably 0.45%; the mass content of Si is preferably 0.01-0.06%, more preferably is 0.02-0.05%, most preferably 0.03-0.04%; the mass content of the S is preferably 0.001-0.002%, more preferably 0.0015%; the mass content of the Cr is preferably 15.6-15.9%, more preferably 15.7% ~15.8%; the mass content of the Mo is preferably 16.1-16.4%, more preferably 16.2-16.3%; the mass content of the Co is preferably 0.1-0.3%, more preferably 0.2%; the mass content of the Cu Preferably it is 0.01-0.05%, more preferably 0.02-0.04%, most preferably 0.03%; the mass content of Fe is preferably 5.5-5.7%, more preferably 5.6%; the mass content of V is preferably 0.16- 0.19%, more preferably 0.17-0.18%; the mass content of the W is preferably 3.7-4.1%, more preferably 3.8-4%, most preferably 3.9%; the mass content of the O is preferably 0.001-0.002% , more preferably 0.0015%; the mass content of the N is preferably 0.001-0.005%, more preferably 0.002-0.004%, most preferably 0.003%; the mass content of the P is preferably 0.001-0.005%, more preferably 0.002-0.004%, most preferably 0.003%; the mass content of the Al is preferably 0.01-0.05%, more preferably 0.02-0.04%, most preferably 0.03%; the mass content of the Ce is preferably 0.01-0.02% , more preferably 0.015%; the mass content of Mg is preferably 0.01-0.08%, more preferably 0.02-0.06%, and most preferably 0.03-0.05%.

The present invention provides a preparation method of the welding wire material according to the above technical solution, comprising:

The alloy raw material is smelted and then casted to obtain an ingot;

The ingot is subjected to homogenization treatment, primary heating, billeting, secondary heating and rolling in sequence to obtain a welding wire material.

In the present invention, the smelting method preferably includes:

Vacuum induction melting is carried out first and then vacuum consumable remelting is carried out.

In the present invention, the method for vacuum induction melting preferably includes:

The alloy raw materials are sequentially batched, charged, melted, refined, alloyed and poured.

In the present invention, the alloy raw material is preferably a high-purity raw material, so as to precisely control the main element of the welding wire material and reduce the residual element content; the alloy preferably includes: metal Ni, metal Cr, metal W, metal Mo, metal Al, Pure iron, Ni-Mg alloy, metal Ce, metal Mn; the metal Ni, metal Cr, metal W, metal Mo, metal Al and metal Ce are preferably pure metal materials; the metal Mn is preferably electrolytic manganese; the The pure iron is preferably ultra-low carbon pure iron, and the mass content of carbon in the ultra-low carbon pure iron is preferably ≤0.005wt%.

In the present invention, the amount of the alloy raw material is such that the composition of the obtained welding wire material is consistent with the composition of the welding wire material described in the above technical solution, and the alloy raw material is prepared according to the content of each element in the welding wire material composition described in the above technical solution That's it. In the present invention, precise dosing is preferred during the dosing process.

In the present invention, the method for charging furnace preferably includes:

The charging bottom material is composed of metallic Ni, pure iron, metallic Cr, metallic Mo, metallic W, metallic Nb and C high melting point elements, and some metallic Ni, pure iron and C are placed in the middle of the crucible; the order of charging is preferably as follows: Add pure iron, small pieces of master alloy, metal Ni, carbon block (center), pure iron, metal Ni, metal Cr, metal W, metal Mo, pure iron, metal Ni; after the bottom material is refined, preferably metal Al is used Alloy with metal Ce; finally add Ni-Mg alloy and metal Mn.

In the present invention, in the charging process, before the metal Mn is added, the vacuum furnace is preferably filled with an inert gas of 45 to 55 Torr to reduce the volatilization of the Mn element; the inert gas is preferably 50 Torr; the inert gas is preferably for argon.

In the present invention, the temperature of the vacuum induction melting is preferably 1500-1550°C, more preferably 1510-1540°C, and most preferably 1520-1530°C; the vacuum degree of the vacuum induction melting is preferably 0.5-1Pa, more preferably It is preferably 0.6 to 0.9 Pa, and most preferably 0.7 to 0.8 Pa.

The present invention can reduce the N content in the alloy by adjusting the charging sequence and adopting the power frequency stirring method in the segmented furnace.

In the present invention, the deoxidation method in the vacuum induction melting process is preferably as follows: on the premise of not using Ca deoxidation, Ni-Mg alloy, rare earth and metal Al are used for deoxidation to reduce the O content; the deoxidation method More preferably:

Carbon deoxidation, Al deoxidation, Ce deoxidation, and Mg deoxidation are performed sequentially.

In the present invention, the method of described deoxygenation is most preferably:

Part of the carbon block and metal Al are loaded into the furnace for early deoxidation, and then part of the carbon block and metal Al are added after the material is leveled. After refining, metal Ce is added for deep deoxidation. Before tapping, metal Mg or Ni-Mg alloy is added for deoxidation. (Deoxidation operation can be carried out in combination with the above-mentioned furnace charging method)

In the present invention, the degree of vacuum in the deoxidation process is preferably less than 1Pa, more preferably 0.5-0.8Pa, and most preferably 0.6-0.7Pa.

In the present invention, in the refining process, the refining time is preferably extended, the refining temperature is increased, the C/O reaction is increased, and the C content is reduced; vacuum and high-temperature refining are preferably used, and the refining temperature is preferably 1530-1550 ° C, more preferably The temperature is 1535-1545°C, most preferably 1540°C; the vacuum degree of the refining is preferably less than 1Pa, more preferably 0.5-0.8Pa, and most preferably 0.6-0.7Pa.

In the present invention, desulfurization is preferably performed during the vacuum induction melting process to improve the purity of the alloy and reduce the level of alloy inclusions; the desulfurization method is preferably: slag desulfurization, Ce desulfurization and Mg desulfurization in sequence.

In the present invention, the method for desulfurization is most preferably:

The slag is loaded into the furnace for early desulfurization, and after refining, Ce desulfurization is added, and Mg desulfurization is added before tapping. (Desulfurization operation can be carried out in combination with the above-mentioned furnace charging method) In the present invention, the slag material preferably includes:

20-24wt% of Al ₂ O ₃ ;

2.4-3.6 wt% TiO ₂ ;

18～22wt% CaO;

4.2～5.8wt% MgO;

45-51 wt% _CaF2 .

In the present invention, the degree of vacuum in the desulfurization process is preferably less than 1 Pa, more preferably 0.5-0.8. Pa, most preferably 0.6 to 0.7 Pa.

In the present invention, in the vacuum induction melting process, it is preferable to analyze the components in the furnace in time to ensure that the chemical components are controlled. During the analysis process, the steel scale can be prepared, and samples are taken from the furnace during smelting, and the powder is prepared to analyze the content of C and S elements. , prepare block samples, and analyze the content of other elements by spectroscopic analysis.

In the present invention, the method for vacuum consumable remelting preferably comprises:

The casting (electrode) obtained after vacuum induction melting and casting is subjected to self-consumption remelting, and then de-ingot is carried out to obtain an ingot.

In the present invention, the vacuum consumable remelting preferably lowers the melting rate appropriately, and the melting rate in the vacuum consumable remelting process is preferably 3-3.5kg/min, more preferably 3.1-3.4kg/min, and most preferably It is preferably 3.2 to 3.3 kg/min.

In the present invention, the vacuum degree of the vacuum consumable remelting is preferably ≤0.13Pa, more preferably ≤0.1Pa.

In the present invention, in the process of vacuum consumable remelting, the method of cooling with helium gas is preferably used to reduce the segregation of chemical components of the alloy. The flow rate of the helium gas is preferably 250-350Pa, more preferably 280-320Pa, and most preferably 300Pa.

The composition of the welding wire material provided by the present invention is a nickel-based alloy, and the melting method of the present invention performs ultra-low carbon control, vacuum desulfurization, deoxidation and denitrification of the nickel-based alloy, and realizes precise control of the chemical composition.

In the present invention, the method for the homogenization treatment preferably includes:

The ingot is charged and heated at a temperature lower than 700° C., the temperature is raised to 1170-1190° C. for 7-9 hours, and the temperature is kept for 35-45 hours.

In the present invention, the temperature of the furnace heating is preferably 650-700°C, more preferably 660-690°C, more preferably 670-680°C; the heating time is preferably 7.5-8.5 hours, more preferably 8 hours; the heating temperature is preferably 1175-1185°C, more preferably 1180°C; the holding time is preferably 38-42 hours; more preferably 40 hours.

In the present invention, the method for one-time heating preferably includes:

The product after the above homogenization treatment is cooled with the furnace and then kept warm, then the temperature is raised to 1130-1150° C. within 0.5-1.5 hours, and the temperature is kept for 3-5 hours.

In the present invention, the cooling time with the furnace is preferably 2.5-3.5 hours, more preferably 3 hours; the cooling temperature is preferably 1000-1200°C, more preferably 1050-1150°C, most preferably 1100°C ; The temperature preservation time is preferably 0.5 to 1.5 hours, more preferably 1 hour. In the present invention, the heating time is preferably 1 hour, and the heating temperature is preferably 1135-1145 °C, more preferably 1140 °C; the heating time after the heating is preferably 3.5-4.5 hours, more preferably 4 hours.

In the present invention, the product after primary heating is preferably 305-406 mm in diameter, more preferably 320-380 mm, more preferably 340-360 mm, and most preferably 305 mm or 406 mm in diameter.

In the present invention, the blanking is preferably performed by an electro-hydraulic hammer. More preferably, the homogenized product is firstly blanked to 120 square meters with an electro-hydraulic hammer, then heated, and then subjected to a second electro-hydraulic hammer. Open billet to 50 cubic meters.

In the present invention, it is preferable to use a 3-5 ton electro-hydraulic hammer for multiple firing times to open the billet to 120 cubic meters, and more preferably 2 to 5 firing times to open the billet to 120 cubic meters at a time.

In the present invention, the heating method is preferably:

The product after the one-time blanking is heated in a furnace below 700°C for 2.5-3.5 hours, and the temperature is raised to 1130-1150°C, and the temperature is kept for 1.5-2.5 hours.

In the present invention, the furnace loading temperature is preferably 20-700°C, more preferably 100-600°C, more preferably 200-500°C, and most preferably 300-400°C. In the present invention, the heating time is preferably 3 hours, the heating temperature is preferably 1135-1145°C, and more preferably 1140°C; the holding time is preferably 2 hours.

In the present invention, 1 ton electro-hydraulic hammer is preferably multi-fired to 50 cubic meters, more preferably 3 to 6 fired times to 50 cubic meters.

In the present invention, the forging temperature in the process of blanking (primary blanking and secondary blanking) is preferably ≥1050°C, more preferably 1050-1140°C, more preferably 1080-1120°C, and most preferably 1100°C; The final forging temperature in the blanking process is preferably ≥950 °C, more preferably 950-1140 °C, more preferably 1000-1100 °C, most preferably 1130-1170 °C; It is 40 to 60 minutes, more preferably 45 to 55 minutes, and most preferably 50 minutes.

In the present invention, the temperature of the secondary heating is preferably 1110-1130°C, more preferably 1115-1125°C, and most preferably 1120°C; the heating time of the secondary heating is preferably ≥2 hours, more preferably 2 hours ~4 hours, most preferably 3 hours; the holding time of the secondary heating is preferably ≥ 30min, more preferably 30-90 minutes, more preferably 40-80min, more preferably 50-70min, most preferably 60min.

棒坯，再进行加热，然后再进行二次轧制，得到

焊丝材料。In the present invention, the rolling is preferably porous type hot rolling. In the present invention, the rolling is preferably carried out twice, and more preferably, the product after the secondary heating is rolled once to obtain

bar billet, heated again, and then subjected to secondary rolling to obtain

welding wire material.

In the present invention, the heating temperature is preferably 1110-1130°C, more preferably 1115-1125°C, and most preferably 1120°C; the heating time is preferably ≥ 1.5 hours, more preferably 1.5-3 hours, and the most Preferably, it is 2 to 2.5 hours; the heating holding time is preferably ≥30 min, more preferably 30 to 90 min, more preferably 40 to 80 min, more preferably 50 to 70 min, and most preferably 60 min.

In the present invention, the blooming temperature in the rolling (primary rolling and secondary rolling) process is preferably ≥1050°C, more preferably 1050-1140°C, more preferably 1080-1120°C, and most preferably 1100°C °C; the final rolling temperature is preferably ≥900 °C, more preferably 900 to 1140 °C, more preferably 950 to 1100 °C, and most preferably 1000 to 1050 °C; less than 30%. In the present invention, in the process of rolling (primary rolling and secondary rolling), due to the great deformation resistance of the alloy, there may be a situation that the rolling cannot pass. At this time, the temperature has dropped to 900°C, and it needs to be returned to the furnace again. Tempering is performed after heating, and the tempering temperature is preferably 1130-1150°C, more preferably 1135-1145°C, and most preferably 1140°C; the tempering time is preferably 30-90 minutes, more preferably 40 ~80 minutes, more preferably 50 to 70 minutes, most preferably 60 minutes.

的盘圆。本发明提供的焊丝材料可应用于LNG储罐的施工建造。The welding wire material provided by the invention is a nickel-based alloy containing 4.2wt% of W and 16.5wt% of Mo. Due to the high content of Mo and W elements, the alloy has high deformation resistance and poor shape during hot working. The smelting process of the component alloy, the heating process in the forging and blanking process, the deformation process, the heating process in the rolling process, and the

's circle. The welding wire material provided by the present invention can be applied to the construction of LNG storage tanks.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other examples that are improved or modified by those of ordinary skill in the art fall within the protection scope of the present invention.

Example 1

The metal Ni, metal Cr, metal W, metal Mo, metal Al, pure iron, Ni-Mg alloy, metal Ce, metal Mn, metal Nb, carbon block alloy raw materials are subjected to vacuum induction melting, and the initial charge in the crucible when charging the furnace It is composed of metal Ni, pure iron, metal Cr, metal Mo, metal W, metal Nb, and carbon block high melting point elements, and some metal Ni, pure iron and carbon block are placed in the middle of the crucible.

After refining the above-mentioned initial charge, metal Al and metal Ce are added for alloying; the refining temperature is 1540°C, and the refining vacuum degree is 0.8Pa.

After the alloying is completed, Ni-Mg alloy and metal Mn are finally added. Before the metal Mn is added, the vacuum furnace is filled with 50 Torr of inert gas argon to reduce volatilization.

During the charging process, some carbon blocks are loaded into the furnace, and then metal Al is added for early deoxidation. After refining, metal Ce is added for deep deoxidation. Before tapping, Ni-Mg alloy is added for Mg deoxidation. The vacuum degree during the deoxidation process is 0.8 Pa.

During the charging process, slag is loaded into the furnace for pre-desulfurization. After refining, metal Ce is added for desulfurization. Before tapping, Ni-Mg alloy is added for Mg desulfurization. The vacuum degree during the desulfurization process is 1Pa.

The alloy liquid obtained after vacuum induction melting is poured to obtain an ingot electrode.

The above-mentioned ingot electrode is de-ingoted after vacuum self-consumption remelting to obtain an ingot with a diameter of 305mm; the melting rate in the vacuum self-consumption remelting process is 3.3kg/min; in the vacuum self-consumption remelting process Nitrogen cooling was adopted, and the flow rate of nitrogen was 300Pa.

The above-mentioned ingot was heated in a furnace at a temperature lower than 700° C., and the temperature was raised to 1180° C. for 8 hours and kept for 40 hours to perform a homogenization treatment.

The product after the above homogenization treatment was cooled in the furnace to 1100° C. for 3 hours, kept for 1 hour, and then heated to 1140° C. in 1 hour, and kept for 4 hours.

The above heated product is opened to a 120mm square billet by 3-5 tons of electro-hydraulic hammer for 4 times. The forging temperature during the blanking process is 1100°C, and the final forging temperature is 1080°C.

The above billeted product is heated in a furnace below 700 °C, heated to 1140 °C for 3 hours, and held for 2 hours. After 5 times of billeting with a 1 ton electro-hydraulic hammer, the billet is opened to a 50mm square billet. The forging temperature is 1100°C, and the final forging temperature is 1080°C.

The above blanked product was heated to 1120° C. for 3 hours and kept for 60 minutes.

The heated product is subjected to porous hot rolling to obtain a round bar with a diameter of 25 mm. The preliminary rolling temperature in the hot rolling process is 1100°C and the final rolling temperature is 1060°C.

The rolled product was heated to 1120° C. for 2 hours and kept for 60 minutes.

The heated product is subjected to porous hot rolling to obtain a round bar with a diameter of 8 mm, and a welding wire material is obtained.

In the above-mentioned two porous hot rolling processes, the deformation amount of the last fire rolling is not less than 30%. During the rolling process, the temperature is reduced to below 900 ° C and then returned to the furnace for tempering. The tempering temperature is 1140 ° C. The tempering time was 60 minutes.

The welding wire material prepared in Example 1 of the present invention was tested for composition according to the GB223 standard, and the test results were:

The performance of the welding wire material prepared in Example 1 of the present invention was tested according to GB/T228-2010 "Room temperature test method for tensile test of metal materials" and GB/T229-2007 "Charpy pendulum impact test method for metal materials". as follows:

Tensile strength: MPa Yield strength: MPa Shrinkage: % V-shaped impact energy (J, -196℃) 736/724 474/469 42/35.5 71/71/70

Example 2

The metal Ni, metal Cr, metal W, metal Mo, metal Al, pure iron, Ni-Mg alloy, metal Ce, metal Mn, metal Nb, carbon block alloy raw materials are subjected to vacuum induction melting, and the initial charge in the crucible when charging the furnace It is composed of metal Ni, pure iron, metal Cr, metal Mo, metal W, metal Nb, and carbon block high melting point elements, and some metal Ni, pure iron and carbon block are placed in the middle of the crucible.

After refining the above-mentioned initial charge, metal Al and metal Ce are added for alloying; the refining temperature is 1530°C, and the refining vacuum degree is 0.6Pa.

After the alloying is completed, Ni-Mg alloy and metal Mn are finally added. Before the metal Mn is added, the vacuum furnace is filled with 50 Torr of inert gas argon to reduce volatilization.

During the charging process, some carbon blocks are loaded into the furnace, and then metal Al is added for early deoxidation. After refining, metal Ce is added for deep deoxidation. Before tapping, Ni-Mg alloy is added for Mg deoxidation. The vacuum degree during the deoxidation process is 0.8 Pa.

During the charging process, slag is loaded into the furnace for pre-desulfurization. After refining, metal Ce is added for desulfurization. Before tapping, Ni-Mg alloy is added for Mg desulfurization. The vacuum degree during the desulfurization process is 1Pa.

The alloy liquid obtained after vacuum induction melting is poured to obtain an ingot electrode.

The above-mentioned ingot electrode is de-ingoted after vacuum self-consumption remelting to obtain an ingot with a diameter of 305 mm; the melting rate in the vacuum self-consumption remelting process is 3.0kg/min; in the vacuum self-consumption remelting process Nitrogen cooling was adopted, and the flow rate of nitrogen was 200Pa.

The above-mentioned ingot was heated in a furnace at a temperature lower than 700° C., and the temperature was raised to 1180° C. for 8 hours and kept for 40 hours to perform a homogenization treatment.

The product after the above homogenization treatment was cooled to 1100° C. for 3 hours with the furnace, kept for 1 hour, and then heated to 1150° C. in 1 hour, and kept for 4 hours.

The above heated product is opened to a 120mm square billet by 3-5 tons of electro-hydraulic hammer for 4 times. The forging temperature during the blanking process is 1100°C, and the final forging temperature is 1080°C.

The above billeted product is heated in a furnace below 700 °C, heated to 1150 °C for 3 hours, and held for 2 hours, and a 1-ton electro-hydraulic hammer is used to open the billet to a 50mm square billet for 5 times. The forging temperature is 1100°C, and the final forging temperature is 1080°C.

The above blanked product was heated to 1130° C. in 3 hours and kept for 60 minutes.

The heated product is subjected to porous hot rolling to obtain a round bar with a diameter of 25 mm. The preliminary rolling temperature in the hot rolling process is 1100°C and the final rolling temperature is 1060°C.

The rolled product was heated to 1130° C. for 2 hours and kept for 60 minutes.

The heated product is subjected to porous hot rolling to obtain a round bar with a diameter of 8 mm, and a welding wire material is obtained.

In the above-mentioned two porous hot rolling processes, the deformation amount of the last fire rolling is not less than 30%. During the rolling process, the temperature is reduced to below 900 ° C and then returned to the furnace for tempering. The tempering temperature is 1140 ° C. The tempering time was 60 minutes.

According to the method of Example 1, the composition detection of the welding wire material prepared in Example 2 of the present invention was carried out, and the detection result was as follows:

According to the method of Example 1, the performance of the welding wire prepared in Example 2 of the present invention was tested, and the test results were:

Tensile strength: MPa Yield strength: MPa Shrinkage: % V-shaped impact energy (J, -196℃) 745/720 484/465 35/25.5 71/71/70

Example 3

The metal Ni, metal Cr, metal W, metal Mo, metal Al, pure iron, Ni-Mg alloy, metal Ce, metal Mn, metal Nb, carbon block alloy raw materials are subjected to vacuum induction melting, and the initial charge in the crucible when charging the furnace It is composed of metal Ni, pure iron, metal Cr, metal Mo, metal W, metal Nb, and carbon block high melting point elements, and some metal Ni, pure iron and carbon block are placed in the middle of the crucible.

After refining the above-mentioned initial charge, metal Al and metal Ce are added for alloying; the refining temperature is 1550° C., and the refining vacuum degree is 0.7Pa.

After the alloying is completed, Ni-Mg alloy and metal Mn are finally added. Before the metal Mn is added, the vacuum furnace is filled with 50 Torr of inert gas argon to reduce volatilization.

During the charging process, some carbon blocks are loaded into the furnace, and then metal Al is added for early deoxidation. After refining, metal Ce is added for deep deoxidation. Before tapping, Ni-Mg alloy is added for Mg deoxidation. The vacuum degree during the deoxidation process is 1Pa. .

During the charging process, slag is loaded into the furnace for early desulfurization. After refining, metal Ce is added for desulfurization. Before tapping, Ni-Mg alloy is added for Mg desulfurization. The vacuum degree during the desulfurization process is 0.6Pa.

The alloy liquid obtained after vacuum induction melting is poured to obtain an ingot electrode.

The above-mentioned ingot electrode is de-ingoted after vacuum self-consumption remelting to obtain an ingot with a diameter of 305 mm; the melting rate in the vacuum self-consumption remelting process is 3.5kg/min; in the vacuum self-consumption remelting process Nitrogen cooling was adopted, and the flow rate of nitrogen was 250Pa.

The above-mentioned ingot was heated in a furnace at a temperature lower than 700° C., and the temperature was raised to 1180° C. for 8 hours and kept for 40 hours to perform a homogenization treatment.

The product after the above homogenization treatment was cooled to 1100° C. for 3 hours with the furnace, kept for 1 hour, and then heated to 1160° C. in 1 hour, and kept for 4 hours.

The above heated product is opened to a 120mm square billet by 3-5 tons of electro-hydraulic hammer for 4 times. The forging temperature during the blanking process is 1100°C, and the final forging temperature is 1080°C.

The above billeted product is heated in a furnace below 700 °C, heated to 1160 °C for 3 hours, and held for 2 hours. After 5 times of billeting with a 1 ton electro-hydraulic hammer, the billet is opened to a 50mm square billet. The forging temperature is 1100°C, and the final forging temperature is 1080°C.

The above blanked product was heated to 1120° C. for 3 hours and kept for 60 minutes.

The heated product is subjected to porous hot rolling to obtain a round bar with a diameter of 25 mm. The preliminary rolling temperature in the hot rolling process is 1100°C and the final rolling temperature is 1060°C.

The rolled product was heated to 1140° C. for 2 hours and kept for 60 minutes.

The heated product is subjected to porous hot rolling to obtain a round bar with a diameter of 8 mm, and a welding wire material is obtained.

In the above-mentioned two porous hot rolling processes, the deformation amount of the last fire rolling is not less than 30%. During the rolling process, the temperature is reduced to below 900 ° C and then returned to the furnace for tempering. The tempering temperature is 1140 ° C. The tempering time was 60 minutes.

According to the method of Example 1, the composition detection of the welding wire material prepared in Example 3 of the present invention was carried out, and the detection results were as follows:

According to the method of Example 1, the performance of the welding wire prepared in Example 3 of the present invention was tested, and the test results were:

Tensile strength: MPa Yield strength: MPa Shrinkage: % AKV(J, -196℃) 730/726 474/460 35/25.5 70/70/72

的盘圆。本发明提供的焊丝材料可应用于LNG储罐的施工建造。It can be seen from the above embodiments that the present invention provides a welding wire material with the following components: 0.35-0.55wt% Mn; 15.5-16wt% Cr; 16-16.5wt% Mo; Co≤0.3wt%; Cu≤0.05 wt%; 5.4～5.8wt% Fe; 0.15～0.2wt% V; 3.6～4.2wt% W; O≤0.002wt%; N≤0.005wt%; P≤0.005wt%; Al≤0.05wt% ; Ce≤0.02wt%; Mg≤0.08wt%; the balance is Ni. By optimizing the melting process of the composition alloy, the heating process in the forging and blanking process, the deformation process and the heating process in the rolling process, the present invention manufactures a

's circle. The welding wire material provided by the present invention can be applied to the construction of LNG storage tanks.

The above are only the preferred embodiments of the present invention, it should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A welding wire material, the composition is: C≤0.008wt%; 0.35～0.55wt% of Mn; Si≤0.06wt%; S≤0.002wt%; 15.5～16wt% Cr; 16～16.5wt% Mo; Co≤0.3wt%; Cu≤0.05wt%; 5.4～5.8wt% Fe; 0.15～0.2wt% of V; 3.6～4.2wt% of W; O≤0.002wt%; N≤0.005wt%; P≤0.005wt%; Al≤0.05wt%; Ce≤0.02wt%; Mg≤0.08wt%; The remainder is Ni. 2. A preparation method of a welding wire material according to claim 1, comprising: The alloy raw material is smelted and then casted to obtain an ingot; The ingot is subjected to homogenization treatment, primary heating, billeting, secondary heating and rolling in sequence to obtain a welding wire material. 3. The method according to claim 2, wherein the smelting method comprises: Vacuum induction melting is carried out first and then vacuum consumable remelting is carried out. The method according to claim 3, wherein the temperature of the vacuum induction melting is 1530-1550°C. 5 . The method according to claim 3 , wherein the melting rate of the vacuum consumable remelting is 3.0-3.5 kg/min. 6 . 6. The method according to claim 2, wherein the method for homogenizing treatment comprises: The ingot is charged and heated at a temperature lower than 700° C., the temperature is raised to 1170-1190° C. for 7-9 hours, and the temperature is kept for 35-45 hours. 7. The method according to claim 2, wherein the method of the primary heating comprises: The homogenized product is cooled with the furnace and then kept warm, and then the temperature is raised to 1130-1150° C. within 0.5-1.5 hours, and the temperature is kept for 3-5 hours; The cooling time with the furnace is 2.5-3.5 hours; The temperature of the cooling is 1000～1200℃; The holding time after the cooling is 0.5-1.5 hours. 8. method according to claim 2, is characterized in that, the method for described blanking comprises: The product after the homogenization treatment is firstly opened to 120 cubic meters by an electro-hydraulic hammer, then heated, and then the electro-hydraulic hammer is further opened to 50 cubic meters for a second time. 9 . The method according to claim 2 , wherein the temperature of the secondary heating is 1110-1130° C. 10 . 10. The method according to claim 2, characterized in that, the preliminary rolling temperature of the rolling is ≥1050°C; the finish rolling temperature is ≥900°C.