| Customization: | Available |
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| Type: | Stainless Steel Bars |
| Standard: | ASTM |
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Inconel600 alloy
Inconel600 round steel
Inconel600 stainless steel tube
Inconel600 board
NO6600 alloy
NiCr15Fe8 alloy
UNS N06600 alloy
2.4816 alloy
About inconel600:
inconel600 alloy is nickel-chromium-iron base solid solution enhanced alloy, inconel600 has good high temperature corrosion resistance and oxidation resistance, excellent hot and cold processing and welding process performance, inconel600 has satisfactory thermal strength and high plasticity below 700ºC. The inconel600 alloy can be strengthened by cold working, or can be joined by resistance welding, fusion welding, or brazing.
The Inconel 600 has the following features:
1. It has good corrosion resistance to reduction, oxidation and nitriding media
2. It has good resistance to stress corrosion cracking at room temperature and high temperature
3. Good corrosion resistance to dry chlorine gas and hydrogen chloride gas
4. It has good mechanical properties at sub-zero, room temperature and high temperature
5. With good creep breaking strength, it is recommended to be used in the working environment above 700ºC.
Inconel 600 Application Scope The application areas are:
1. Erosive atmosphere of thermocouple casing
2. Production of vinyl chloride monomer: resistance to chlorine gas, hydrogen chloride, oxidation and carbonization corrosion
3. Conversion of uranium oxidation to hexafluoride: resistance to hydrogen fluoride corrosion
4. Areas of production and use of caustic alkali metals, particularly in the environment where sulfides are used
5. Titanium dioxide process with chlorine gas
6. Production of organic or inorganic chlorides and fluoride: 7. Nuclear reactors
8. Curved neck bottles and components in heat treatment furnace, especially in carbonization and nitriding atmosphere
9. The catalytic regenerator in petrochemical production is recommended to use alloy 600 for longer service life in applications above 700ºC.
Inconel600 steel is nickel alloy high temperature resistant material (American grade), mainly used in the field of corrosion resistance. The high nickel content makes the material particularly resistant to corrosive environments and chloride corrosion fission. The chromium in the alloy increases the corrosion resistance of the material in weak oxidation environments. The chemical composition and mechanical properties of the materials are shown in Table 1[1].
The welding hot crack of Inconel600 steel is mainly formed by the interaction of material metallurgy factors and mechanical factors: (1) nickel content is high, the material crystallizes once and keeps to room temperature for the structure of austenite, easy to form strong directional columnar crystal and dendritic crystal, promote the segregation of harmful impurities such as S, P or the formation of low melting eutectic due to the decrease of solubility;
(2) The thermal conductivity of the material is small, the thermal expansion coefficient is large, and the tensile stress generated by the plastic reserve and shrinkage of the material changes with the decrease of temperature under the local welding heating and cooling strips. The existence of low melting point phase reduces the plastic reserve and promotes the generation of thermal cracks.
2. 1 Influence of primary crystal structure on hot cracking behavior of weld metal
The content of Ni in Inconel600 steel is as high as 72%. Ni is a strong austenitic forming element (γ phase). In the iron-nickel phase diagram (FIG. 1) and the iron-chrome-nickel ternary phase diagram (FIG. 2), it can be seen that the alloy forms γ austenite structure directly after liquid phase solidification and is kept at room temperature [2].
Under the action of welding heat cycle, recrystallization of metals in weld and heat affected zone occurs (reinforced by multi-layer welding). The recrystallization process of austenite structure does not undergo phase transformation, so it cannot be refined. Moreover, the consistency of segregation direction makes the new grain boundary easy to enrich the phase with low melting point. Because the weld metal has good thermal cracking resistance, the crack is easy to appear in the heat-affected zone of the base metal or the heat-affected zone of the weld before multilayer welding.
2. Influence of alloying elements and impurities
Alloying elements affect the microstructure and properties of metal materials. Cr is a strong carbide forming element, which mainly improves the high temperature strength and corrosion resistance of steel. Ni is a strong austenite forming element, which improves the effect of electrochemical corrosion resistance, but γ phase is easy to form segregation. C has strong austenitization and is easy to form M23C6 mixed carbide with Cr, but the solubility of solid austenite to carbon decreases sharply, which is easy to produce intergranular corrosion. Mn is an austenitic forming element, and Mn and S are easy to form manganese sulfide eutectic with melting point of 1580ºC. S is an impurity element and sulfur exists in steel in the form of FeS. FeS and Fe can form eutectic crystals with low melting point (985ºC) at austenitic grain boundaries, and the intergrain bonding is destroyed when the steel is heated to about 1200ºC [3].
The main elements that increase the sensitivity of hot cracking are S, P, B, Nb, Si and Ti. Typically, austenite has a lower solubility to these elements than ferrite, which is further reduced when the material has a higher nickel content.
2. 3 Influence of segregation
The crystallization of multicomponent alloy is in a temperature range. After solidification, the alloy will form an unstable state of unbalanced composition and try to change into an equilibrium state through diffusion. Primary crystallization is
γ phase region will produce a larger segregation tendency, many elements in austenite diffusion ability is very poor, precipitated phase is difficult to achieve uniformity through diffusion, even if the element content is very low, low melting point phase can also occur precipitation. Dissolution of S and P elements in austenite
The solubility is further reduced due to segregation, which aggravates the adverse effects of the harmful elements in the remaining solution.
Inconel 600 alloys are welded without preheating, but when the temperature of the base material is below 15 ° C, the joint should be heated 250 to 300 mm wide to 15-20% on both sides of the joint to avoid moisture condensation resulting in welding pores. To prevent the appearance of grains in the weld and heat-affected zone and the precipitation of grown carbide should usually be kept at a lower interlaminar temperature of no more than 100%. Avoid the welding area staying at high temperature for too long, pay attention to rapid cooling can prevent corrosion tendency, welding to fast cooling, if the gas in the weld can not escape, it is easy to form a gas hole. Therefore, before welding, thoroughly clean the groove, nearby oxidation layer, various and oil pollution. , can prevent the formation of pores.
INCONEL 600 (NS 312) alloy, UNS serial number is N06600 is a typical nickel-chromium alloy, belongs to the iron base resistance. The thermal alloy has good resistance to high temperature oxidation and chloride ion stress corrosion. Organic acids are all kinds of exhaust gases, alkaline solutions and most of them and the compounds have high corrosion resistance. Neutralization with a high concentration of chlorinated compounds in caustic soda solutions containing OH-1 Neutralization in solutions containing trace chlorinated compounds in oxygenated hot water and high temperature water with excellent stress corrosion resistance is mainly used in chemistry, food processing, equipment and thermal site management equipment, such as manufacturing heaters, heat exchangers, steam generators, distillation towers and oils. Use cold condenser for fatty acid treatment and so on. Incone 1600 used for recycling welding metal, due to the poor liquidity of liquid metal, metal melting at the weld, easy to produce a variety of welding defects; The mechanical properties and corrosion resistance of welded joints depend on the correct selection of welding materials, strict grid control of welding heat input and reasonable welding process. Welding points of Inconel 600 used in regenerator of fence propylene device were determined by welding process test to determine reasonable welding process parameter number for reference to international actual production
Inconel 600 liquid metal has poor fluidity and should have a larger jointed inclination. The weld metal is shallow and easy to form. By welding, the thickness of the blunt edge of the joint is smaller. The welding heat input should not be too small, nor should it be improved by increasing the welding current, which will increase the sensitivity of thermal cracks and lead to the separation of the weld metal. Oxygen evaporates and pores appear. Welding should use moderate current, faster welding speed, by reducing the residence time at high temperature to control the welding heat. Enter the quantity. Inconel 600 alloy has a large linear expansion coefficient and high thermal crack sensitivity, which is easy to produce hot cracks during welding, such as solidification. The first weld is guaranteed by cracks, multilateral cracks and high temperature deplasticizing cracks. The convex shape of the outer surface and the filling of the arc pit can effectively prevent the generation of thermal cracks.
There is no doubt about the selection of welding materials and the formulation of welding process specification parameters
Combined with the welding characteristics of Inconel 600 alloy, the product with excellent welding performance was selected after several tests of welding performance. Good encicrfe.3(electrode arc welding rod) and ernicr-3(manual tungsten argon arc welding wire) welding materials, and optimized welding process parameters (Table 4).
Welding process evaluation
Use the welding materials and related welding process specification parameters in Table 4, according to nb/t 47014 ~ 011 and the design of combined regenerator. Technical conditions: The test parts were welded with 12mm thick Inconel 600 alloy by electrode arc welding and manual argon tungsten arc welding process evaluation, as well as chemical composition and curvature test results are shown in Table 5 and Table 6. The gold in each area was evaluated by two welding processes. The photographs are shown in Figure 2 and Figure 3.
The test analysis shows that the chemical composition of the weld metal, the mechanical properties of the welded joint and the metallographic structure meet the requirements, which proves that the welding materials selected and the welding process formulated are correct and reasonable. The welding quality of the final product depends on the actual operation of the welder with the appropriate welding process specification parameters verified by welding process evaluation based on the welding performance test of materials. Before product welding, in the welder for the necessary theoretical training at the same time, focus on the actual operation of the examination, and the development of a strict including a number of quality inspection points Inconel 600 alloy welding instructions, guidance and control of the whole process of the regenerator welding. The fact shows that the weld forming is beautiful, the nondestructive testing pass rate is high and can meet the requirements of the design alloy process control.
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