CN110977244A - Formula and production process of 07MnNiMoDR steel low-alloy welding rod for spherical tank at-50 DEG C - Google Patents
Formula and production process of 07MnNiMoDR steel low-alloy welding rod for spherical tank at-50 DEG C Download PDFInfo
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- CN110977244A CN110977244A CN201911355436.1A CN201911355436A CN110977244A CN 110977244 A CN110977244 A CN 110977244A CN 201911355436 A CN201911355436 A CN 201911355436A CN 110977244 A CN110977244 A CN 110977244A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- Mechanical Engineering (AREA)
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Abstract
The invention provides a formula of a low-alloy welding rod made of 07MnNiMoDR steel and used for a spherical tank at the temperature of-50 ℃, which comprises a core wire and a coating, wherein the welding rod comprises the following chemical components in percentage by mass: c: 0.03 to 0.08%, Mn: 0.5-1.2%, Si: 0.1-0.5%, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, and the balance Fe, the electrode of the formula has high and stable toughness index. The welding rod has higher bonding performance when being welded with a 07MnNiMoDR steel plate, and the cold crack sensitivity of weld metal is low. The low alloy welding rod is suitable for large heat input welding, and excellent comprehensive performance can be obtained when the heat input is 40.2 KJ/cm. The welding energy is controlled below 40KJ/cm, and the temperature between the channels is controlled at 100 ℃ and 170 ℃.
Description
Technical Field
The invention relates to the field of spherical containers, in particular to a formula of a low-alloy welding rod made of 07MnNiMoDR steel and used for a spherical tank at the temperature of-50 ℃ and a production process thereof.
Background
The spherical container has the advantages of minimum surface area, light weight, even stress, small occupied area, convenient construction, cost saving and the like, and is widely used for storing liquefied gases such as Liquefied Petroleum Gas (LPG), Liquefied Natural Gas (LNG) ethylene, propylene, propane, butane, liquid ammonia, liquid oxygen and the like, oxygen, nitrogen, nuclear gas, natural gas, urban gas and the like in the industries such as petroleum, chemical engineering, metallurgy, urban gas, light industry aerospace, nuclear energy and the like. With the rapid development of petroleum, chemical industry and steel material industry in China, particularly the technical progress of the spherical tank construction technology, the spherical container construction has the development trend of high pressure and large scale.
In recent years, 07MnNiMoDR steel plates at 50 ℃ below zero for constructing large-sized spherical tanks of ethylene, propylene and the like are made into a home-made state, but matched welding materials of the steel plates still depend on import, are monopolized by Japan steel and New day iron companies for a long time, and use LB-62L, LB-65L, L-60LT, so that welding bars for constructing the spherical tanks of ethylene and the like in China are limited by people for a long time, not only are the price high and a large amount of foreign exchange is consumed, but also the purchase period is long, and the construction progress is influenced. The construction design, construction units and technical experts of domestic spherical tanks strongly call domestic welding material enterprises to develop low-temperature high-toughness ultralow-hydrogen welding rods meeting the technical requirements of the construction of ethylene and other low-temperature spherical tanks, and the monopoly control of foreign companies is rapidly broken.
Disclosure of Invention
The invention provides a formula of a low-alloy welding rod made of 07MnNiMoDR steel and used for a spherical tank at the temperature of-50 ℃ and a production process thereof.
The technical scheme of the invention is realized as follows: the formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank comprises a core wire and a coating, and is characterized in that: the welding rod comprises the following chemical components in percentage by mass: c: 0.03 to 0.08%, Mn: 0.5-1.2%, Si: 0.1-0.5%, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, and the balance Fe, and other inevitable impurity elements.
Preferably, C: 0.05 to 0.06 percent, Mn: 0.7-1.0%, Mo: 0.14-0.29%, S: 0.002-0.008%, P: 0.002-0.008%.
Preferably, the diameter of the low alloy welding rod is 1-3 mm.
Preferably, the core wire is made of carbon steel or alloy steel.
Preferably, the thickness of the sheath is 20% -340% of the diameter of the core wire.
Preferably, the mass of the coating accounts for 22% -40% of the total mass of the welding rod.
Preferably, the coating at the front end of the welding rod is provided with a chamfer.
The invention also discloses a production process of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank, which comprises the following steps:
1) grinding the raw materials into powder according to the mass part ratio;
2) mixing the powder of the coating uniformly, adding adhesive, and stirring at room temperature for 10-25 min;
3) coating the mixed powder of the electrode coating prepared in the step on a core wire, and performing press coating;
4) and (3) directly putting the welding rod prepared in the step into a baking oven for drying treatment to obtain the welding rod.
Preferably, the particle size of the prepared powder in step 1 is 100-500 meshes.
Preferably, the weight ratio of the adhesive to the mixed powder is 20-40: 120.
preferably, the adhesive is a potassium sodium water glass solution.
Preferably, the addition amount of the adhesive is: at least 0.5 kg of adhesive was added per 100 kg of the mixed powder.
Preferably, the drying treatment of step 4 includes low-temperature preheating, medium-temperature drying and high-temperature drying.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the welding rod with the formula has the advantages of little fluctuation of deposited metal chemical components, tensile strength and elongation percentage threshold after fracture, and high and stable toughness index.
2. The low-alloy welding rod has higher bonding performance when being welded with a 07MnNiMoDR steel plate, and the cold crack sensitivity of weld metal is low.
3. The low alloy welding rod is suitable for large linear energy welding, and excellent comprehensive performance can be obtained when the linear energy is 40.2 KJ/cm. The welding energy is controlled below 40KJ/cm, and the temperature between the channels is controlled at 100 ℃ and 170 ℃.
4. The low-alloy welding rod has good welding process performance, high deposition efficiency, excellent low-temperature plasticity and toughness of large-linear energy welding deposited metal and a welding joint, meets the technical specification requirements in all properties, can completely replace Nisheng steel LB-65L welding rods, and is used for constructing a spherical tank made of 07MnNiMoDR steel at the temperature of-50 ℃.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Definition and interpretation
Unless otherwise specified, the symbols are mass%.
Unless otherwise specified, all the articles used in the present invention are commercially available products.
Example 1
The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank comprises a core wire and a coating, and the formula comprises the following chemical components in percentage by mass: c: 0.067%, Mn: 0.86%, Si: 0.15%, Mo: 0.29%, Ni: 2.35%, S: 0.006%, P: 0.005%, and the balance of Fe, and other inevitable impurity elements.
Table 1 deposited metals chemical composition%
| Numbering | C | Mn | Si | Mo | Ni | S | P |
| Required value | ≤0.10 | ≤1.35 | ≤0.60 | 0.10～0.30 | 2.0～2.75 | ≤0.010 | ≤0.012 |
| Measured value | 0.067 | 0.86 | 0.15 | 0.29 | 2.35 | 0.006 | 0.005 |
TABLE 2 formulation-deposited metal mechanical properties (620 ℃ X1 h)
Note: preheating and interlayer temperature: voltage 25V at 100 DEG C
TABLE 3 moisture content and diffusible hydrogen of the coating
In the above embodiment, more specifically, the diameter of the low alloy electrode is 1.5 mm.
In the above embodiment, more specifically, the core wire is made of alloy steel.
In the above embodiment, more specifically, the thickness of the sheath is 150% of the diameter of the core wire.
In the above embodiment, more specifically, the mass of the coating is 30% of the total mass of the welding rod.
In the above embodiment, more specifically, the coating at the front end of the welding rod is provided with a chamfer.
Example 2
The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank comprises a core wire and a coating, and the formula comprises the following chemical components in percentage by mass: c: 0.03 to 0.08%, Mn: 0.5-1.2%, Si: 0.1-0.5%, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, and the balance Fe, and other inevitable impurity elements.
Table 4 formulation two deposited metals chemical composition%
TABLE 5 formulation two deposited metal mechanical properties (620 ℃ X1 h)
Note: preheating and interlayer temperature: voltage 25V at 100 deg.C, X-ray flaw detection I
In the above embodiment, more specifically, the diameter of the low alloy electrode is 2 mm.
In the above embodiment, more specifically, the core wire is made of carbon steel.
In the above embodiment, more specifically, the thickness of the sheath is 200% of the diameter of the core wire.
In the above embodiment, more specifically, the mass of the coating is 35% of the total mass of the welding rod.
In the above embodiment, more specifically, the coating at the front end of the welding rod is provided with a chamfer.
Example 3
The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank comprises a welding core and a welding rod, wherein the welding rod comprises the following chemical components in percentage by mass: c: 0.03 to 0.08%, Mn: 0.5-1.2%, Si: 0.1-0.5%, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, and the balance Fe, and other inevitable impurity elements.
Table 6 deposited metals chemical composition%
TABLE 7 mechanical properties of deposited metal of welding rod (620 ℃ C.. times.1 h)
Note: preheating and interlayer temperature: voltage 25V at 100 DEG C
In the above embodiment, more specifically, the diameter of the low alloy electrode is 2.5 mm.
In the above embodiment, more specifically, the core wire is made of alloy steel.
In the above embodiment, more specifically, the thickness of the sheath is 100% of the diameter of the core wire.
In the above embodiment, more specifically, the mass of the coating is 25% of the total mass of the welding rod.
In the above embodiment, more specifically, the coating at the front end of the welding rod is provided with a chamfer.
The invention also discloses a production process of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank, which comprises the following steps:
1) grinding the raw materials into powder according to the mass part ratio;
2) mixing the powder of the coating uniformly, adding adhesive, and stirring at room temperature for 20 min;
3) coating the mixed powder of the electrode coating prepared in the step on a core wire, and performing press coating;
4) and (3) directly putting the welding rod prepared in the step into a baking oven for drying treatment to obtain the welding rod.
In the above embodiment, more specifically, the particle size of the powder prepared in step 1 is 300 mesh.
In the above embodiment, more specifically, the weight ratio of the adhesive to the mixed powder is 30: 100.
in the above embodiment, more specifically, the adhesive is a potassium sodium water glass solution.
In the above embodiment, more specifically, the addition amount of the adhesive is: 1 kg of adhesive was added per 100 kg of the mixed powder.
In the foregoing embodiment, more specifically, the drying process in step 4 includes low-temperature preheating, medium-temperature drying, and high-temperature drying. The low-temperature preheating is carried out at the temperature of 80 ℃ for 20 min; the medium-temperature drying adopts the temperature of 100 ℃ and the medium-temperature drying time of 20 min; the high-temperature drying adopts the temperature of 200 ℃ and the high-temperature drying time of 15 min.
The following main measures are taken according to the main technical requirements:
1) low-hydrogen coating is adopted. In the design of the coating, proper high alkalinity is kept to improve the toughness and crack resistance of weld metal, reduce the content of diffused hydrogen of weld deposited metal to the maximum extent and realize the ultra-low hydrogen control target.
2) The proportional relation among acid oxides such as fluorite, marble, silicate and the like is balanced, the melting point of the coating is reasonably controlled, the drop transition form is adjusted, and the excellent welding process performance and the mechanical property of a welding seam are ensured.
3) Properly increase the electric arc blowing force, improve the electric arc stiffness, enhance the stirring effect of a molten pool, reduce the air hole sensitivity and reduce the welding defects.
4) The fluidity of molten iron in a molten pool is adjusted, the wettability is improved, the welding line is attractive in shape, and slag is easy to remove.
5) By improving the deoxidation capability, adopting measures such as weld toughening and purification, microalloying and the like, the toughness and the large current resistance of the deposited metal are improved, and the influence of large linear energy on the strength and the toughness of the deposited metal is reduced.
6) The source of impurity elements of the raw and auxiliary materials is strictly controlled, the content of brittle elements in deposited metal is controlled, and the crack resistance and crack arrest capability of a welding seam are improved.
7) And a Mn-Ni-Mo alloy system basically equivalent to the welding parent metal is adopted, so that the performance influence of a heat affected zone is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank comprises a core wire and a coating, and is characterized in that: the welding rod comprises the following chemical components in percentage by mass: c: 0.03 to 0.08%, Mn: 0.5-1.2%, Si: 0.1-0.5%, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, and the balance Fe, and other inevitable impurity elements.
2. The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank according to claim 1 is characterized in that: c: 0.05 to 0.06 percent, Mn: 0.7-1.0%, Mo: 0.14-0.29%, S: 0.002-0.008%, P: 0.002-0.008%.
3. The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank according to claim 1 is characterized in that: the diameter of the low-alloy welding rod is 1-3 mm.
4. The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank according to claim 1 is characterized in that: the welding core is made of carbon steel or alloy steel.
5. The formula of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank according to claim 1 is characterized in that: the thickness of the flux coating is 20% -340% of the diameter of the core wire; the mass of the coating is 22-40% of the total mass of the welding rod.
6. The invention also discloses a production process of the low-alloy welding rod for the 07MnNiMoDR steel-50 ℃ spherical tank, which comprises the following steps:
1) grinding the raw materials into powder according to the mass part ratio;
2) mixing the powder of the coating uniformly, adding adhesive, and stirring at room temperature for 10-25 min;
3) coating the mixed powder of the electrode coating prepared in the step on a core wire, and performing press coating;
4) and (3) directly putting the welding rod prepared in the step into a baking oven for drying treatment to obtain the welding rod.
7. The production process of the 07MnNiMoDR steel low-alloy welding rod for the spherical tank at-50 ℃ according to the claim 6, is characterized in that: the particle size of the prepared powder in the step 1 is 100-500 meshes.
8. The production process of the 07MnNiMoDR steel low-alloy welding rod for the spherical tank at-50 ℃ according to the claim 6, is characterized in that: the weight ratio of the adhesive to the mixed powder is 20-40: 120.
9. the production process of the 07MnNiMoDR steel low-alloy welding rod for the spherical tank at-50 ℃ according to the claim 6, is characterized in that: the adhesive is a potassium-sodium water glass solution. The addition amount of the adhesive is as follows: at least 0.5 kg of adhesive was added per 100 kg of the mixed powder.
10. The production process of the 07MnNiMoDR steel low-alloy welding rod for the spherical tank at-50 ℃ according to the claim 6, is characterized in that: and the drying treatment of the step 4 comprises low-temperature preheating, medium-temperature drying and high-temperature drying.
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