阅读说明：本技术 一种钛钙型渣系双相不锈钢焊条及其制备 (Titanium-calcium slag system double-phase stainless steel welding rod and preparation thereof ) 是由 刘鑫 公茂涛 苏东东 张敏娟 吴宝鑫 林永祥 于 2019-09-18 设计创作，主要内容包括：本发明涉及一种钛钙型渣系双相不锈钢焊条及其制备,焊条包括焊芯以及压涂在所述焊芯的药皮,所述药皮由固体组分与液体组分混合,其中,所述固体组分包括以下重量份数的组分：天然金红石25-30份,钾长石6-8份,萤石2-5份,大理石7-13份,钛铁矿5-8份,烘焙云母5-9份,氮化铬铁2-5份,微碳铬铁5-10份,锰硅合金3-5份,钼铁5-10份；所述液体组分为3:7钾钠水玻璃。与现有技术相比,本发明制得的焊条在焊缝金属具有良好的耐腐蚀性能,适用于022Cr22Ni5Mo3N等双相不锈钢的焊接。(The invention relates to a titanium-calcium slag system duplex stainless steel welding rod and a preparation method thereof, wherein the welding rod comprises a core wire and a coating pressed on the core wire, and the coating is formed by mixing a solid component and a liquid component, wherein the solid component comprises the following components in parts by weight: 25-30 parts of natural rutile, 6-8 parts of potassium feldspar, 2-5 parts of fluorite, 7-13 parts of marble, 5-8 parts of ilmenite, 5-9 parts of baking mica, 2-5 parts of chromium iron nitride, 5-10 parts of micro-carbon chromium iron, 3-5 parts of manganese-silicon alloy and 5-10 parts of ferromolybdenum; the liquid component is 3:7 potassium sodium water glass. Compared with the prior art, the welding rod prepared by the invention has good corrosion resistance in weld metal, and is suitable for welding 022Cr22Ni5Mo3N and other duplex stainless steel.)

1. A titanium-calcium slag system duplex stainless steel welding rod is characterized by comprising a core wire and a coating pressed on the core wire, wherein the coating is formed by mixing a solid component and a liquid component,

the solid component comprises the following components in parts by weight: 25-30 parts of natural rutile, 6-8 parts of potassium feldspar, 2-5 parts of fluorite, 7-13 parts of marble, 5-8 parts of ilmenite, 5-9 parts of baking mica, 2-5 parts of chromium iron nitride, 5-10 parts of micro-carbon chromium iron, 3-5 parts of manganese-silicon alloy and 5-10 parts of ferromolybdenum.

2. The electrode of claim 1, wherein the liquid component is potash sodium silicate.

3. The electrode of claim 2, wherein said soda-lime-silica type slag duplex stainless steel electrode has a baume degree of 43 ° Be' at 20 ℃ and a modulus of 3.2M.

4. The electrode of claim 1, wherein the core wire comprises the following elements in percentage by mass: 0-0.03% of C, 1.00-2.5% of Mn, 0-0.25% of Si, 19.5-22% of Cr, 9.0-11% of Ni, 0-0.02% of S, 0-0.025% of P and the balance of Fe.

5. The electrode as claimed in claim 1, wherein the amount of the liquid component added is 22-24% by mass of the solid component.

6. The electrode as claimed in claim 1, wherein said titanium-calcium type slag system duplex stainless steel electrode is made of natural rutile, TiO₂The mass content of (A) is not less than 90%;

in potassium feldspar, KAlSi₃O₈≥90wt％；

In fluorite, CaF₂≥97wt％；

In the marble, CaCO3 is more than or equal to 97 wt%;

in ilmenite, TiO₂≥48wt％；

In baked mica, SiO₂The mass content of (A) is 44-58%;

in the ferrochromium nitride, Cr is more than or equal to 60.0wt percent, and N is more than or equal to 3.0wt percent;

in the micro-carbon ferrochrome, the mass content of Cr is 65.0-75.0%;

in the manganese-silicon alloy, the mass content of Mn is 66-70%, and the mass content of Si is 17-20%;

in the ferromolybdenum, Mo is more than or equal to 55.0 wt%.

7. The method of making a titanium-calcium based slag system duplex stainless steel electrode of any one of claims 1 to 6, comprising the steps of:

(1) sieving the solid components, mixing uniformly according to a proportion, adding the liquid components, and stirring uniformly to obtain a medicinal coating;

(2) and (3) coating the flux coating obtained in the step (1) on a welding core by pressing to obtain the welding rod, namely the target product.

8. The method for preparing a titanium-calcium based slag duplex stainless steel electrode according to claim 7, wherein in the step (1), the sieving is performed by using a 40-mesh sieve to below 40 meshes.

Technical Field

The invention belongs to the technical field of welding materials, and relates to a titanium-calcium slag system double-phase stainless steel welding rod and a preparation method thereof.

Background

Duplex stainless steels have both the advantages of ferritic stainless steels and austenitic stainless steels and have been gaining popularity since the time of the advent. At present, duplex stainless steel is widely applied to industries such as petroleum, chemical engineering, natural gas high-pressure systems, seawater treatment, atomic energy industry, chemical transport ships and the like, wherein the SAF2205 is the main force of duplex stainless steel series and accounts for 80 percent of the total output of the steel.

With the continuous expansion of the application field of duplex stainless steel in China, the demand of welding materials is increasingly vigorous. At present, duplex stainless steel welding materials mainly depend on imports. Therefore, the development of the welding material can not only meet the urgent market demand, but also improve the market competitiveness of enterprises.

Currently, SAF2205 duplex stainless steel replaces austenitic stainless steel 316L and 317L and becomes a standard material of steel for chemical containers. Meanwhile, the welding rod with the corresponding welding material B2209-16 and the coating type of titanium and calcium does not appear. The present application has been made in view of the above problems.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a titanium-calcium slag duplex stainless steel welding rod and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

one technical scheme of the invention is to provide a titanium-calcium slag system duplex stainless steel welding rod, which comprises a core wire and a coating pressed on the core wire, wherein the coating is formed by mixing a solid component and a liquid component,

the solid component comprises the following components in parts by weight: 25-30 parts of natural rutile, 6-8 parts of potassium feldspar, 2-5 parts of fluorite, 7-13 parts of marble, 5-8 parts of ilmenite, 5-9 parts of baking mica, 2-5 parts of chromium iron nitride, 5-10 parts of micro-carbon chromium iron, 3-5 parts of manganese-silicon alloy and 5-10 parts of ferromolybdenum.

Further, the liquid component is potassium sodium water glass (wherein, the mass ratio of potassium oxide to sodium oxide is preferably 3: 7).

Further, the potassium sodium water glass has a Baume degree of 43 DEG Be' at 20 ℃ and a modulus of 3.2M.

Further, the core wire comprises the following element components in percentage by mass: 0-0.03% of C, 1.00-2.5% of Mn1.00-2.5% of Si, 19.5-22% of Cr, 9.0-11% of Ni, 0-0.02% of S, 0-0.025% of P and the balance of Fe.

Further, the mass of the added liquid component is 22-24% of the mass of the solid component.

Further, among the raw material components of the solid component, natural rutile and TiO₂The mass content of (A) is not less than 90%;

in potassium feldspar, KAlSi₃O₈≥90wt％；

In fluorite, CaF₂≥97wt％；

In the marble, CaCO3 is more than or equal to 97 wt%;

in ilmenite, TiO₂≥48wt％；

In baked mica, SiO₂The mass content of (A) is 44-58%;

in the ferrochromium nitride, Cr is more than or equal to 60.0wt percent, and N is more than or equal to 3.0wt percent;

in the micro-carbon ferrochrome, the mass content of Cr is 65.0-75.0%;

in the manganese-silicon alloy, the mass content of Mn is 66-70%, and the mass content of Si is 17-20%;

in the ferromolybdenum, Mo is more than or equal to 55.0 wt%.

The second technical scheme of the invention is to provide a preparation method of the titanium-calcium slag system duplex stainless steel welding rod, which comprises the following steps:

(1) sieving the solid components, mixing uniformly according to a proportion, adding the liquid components, and stirring uniformly to obtain a medicinal coating;

(2) and (3) coating the flux coating obtained in the step (1) on a welding core by pressing to obtain the welding rod, namely the target product.

Further, in the step (1), the sieving is to adopt a 40-mesh sieve to sieve below 40 meshes.

Compared with the prior art, the welding rod prepared by the invention is applied to ultra-low carbon stainless steel materials, is particularly suitable for welding dual-phase stainless steel such as 022Cr22Ni5Mo3N and the like, can well meet the requirements of mechanical properties and the like of deposited metal, and has good welding process performance and good crack resistance and corrosion resistance of weld metal in the welding process.

Detailed Description

The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

In the following examples, unless otherwise specified, starting materials or techniques are indicated to be conventional commercial products or conventional processing techniques in the art.

The solid components in the coating of the invention are as follows:

1) natural rutile (TiO)₂More than or equal to 90 percent): the main functions are arc stabilization and slag forming, short slag effect is caused, the melting point, viscosity, surface tension and fluidity of the slag can be adjusted, the weld forming is improved, and splashing is reduced.

2) Potassium feldspar (KAlSi)₃O₈More than or equal to 90 percent): the main functions are slagging, adjusting the physical properties of the slag, increasing the fluidity of the slag in the welding process, and simultaneously having strong arc stabilization and molten drop refining functions.

3) Fluorite (CaF)₂More than or equal to 97 percent): the main functions are slagging and dehydrogenation, and the surface tension of liquid metal can be reduced, the fluidity of the liquid metal is improved, the melting point of slag is reduced, and the weld joint is attractive in appearance. When the content of CaF2 in the coating is too low, the fluidity of the slag is poor, the slag coverage and the weld joint forming are poor, and when the content of CaF2 in the coating is too high, the fluidity of the slag is too active, the melting speed of the coating is high, and the phenomena of incomplete coverage and poor fluidity occur. Therefore, the CaF2 content in the coating should be controlled at 2-5 parts.

4) Marble (CaCO)₃More than or equal to 97 percent): the main functions of the slag former and the gas former are slag former and gas former, and the influence on the welding metallurgical reaction is large. CaO produced by the decomposition belongs to basic oxides. Can improve the alkalinity of the slag and enhance the S and P removing capability of the slag. But also increases the surface tension of the slag and meltingThe interfacial tension between the metals, coarsening the molten droplets (when the amount is too large, the arc blowing force is too large, and the spatter increases).

5) Ilmenite (TiO)₂More than or equal to 48 percent): the main function is slag former, reducing the splashing rate. The lowering of TiO2 can lead to the deterioration of slag fluidity and the increase of slag viscosity, thus deteriorating the welding process performance. Through tests and combining favorable and unfavorable factors, the addition amount of the ilmenite is determined to be in the range of 5-8 parts.

6) Baked mica (SiO)₂44-58%): the main function is to increase the elastic plasticity of the coating of the welding rod, improve the press coating performance of the welding rod and simultaneously be a slag former. Porosity sensitivity can be reduced in stainless steel electrodes.

7) Ferrochromium nitride (Cr is more than or equal to 60.0%; n is more than or equal to 3.0%): the method has the main effect of increasing the formation of austenite in weld metal, wherein the effect of enlarging the austenite region by N is 30 times that of Ni through test tests, so that the use amount of noble metal Ni is reduced, and the cost is reduced.

8) Micro-carbon ferrochrome (Cr: 65.0-75.0%): the alloy mainly plays a role of an alloying agent, the transition Cr plays a role of oxidation resistance and corrosion resistance, and simultaneously, the alloy carburetion agent can carburete molten drops and also can play a role of refining the molten drops.

9) Manganese-silicon alloy (Mn: 66-70%, Si: 17-20%): the silicon is used as strong deoxidizer for precipitation and diffusion deoxidation, and the addition of manganese can increase the strength and improve the plasticity and toughness of weld metal.

10) Ferromolybdenum (Mo is more than or equal to 55.0%): the main function is to improve the strength and toughness of the weld metal.