Sheet, strip 08kh18t1 - 1.4016 - aisi 430
Ferritic-chromium corrosion resistant steel grade for General use AISI 430 (standard ASTM A240) has a high resistance to corrosion, including atmospheric, high strength and mechanical properties. Data quality due to a high chromium, low carbon content. The steel has good machinability (plastic deformability).
The chemical composition of AISI 430.
|The composition of the steel, in %||C||Cr||P||Mn||S||Si|
|ASTM A240||0.12 max||16.0−18.0||0.045 max.||1.0 max.||0.03 max.||1.0 max.|
|Standard||less than 0.05||17||0.020||0.7||0.025||0.65|
AISI 430 is positioned formally on the chemical composition as a counterpart to the domestic steel 12X17. But low concentration in carbon steel leads to the absence of necessity for its further stabilization with titanium, because the carbon content at the level of 0,020−0,035% provides at higher temperatures, the absence inclination to intergranular corrosion (intense carbamoilirovaniem starts at t° above 1000°C), moreover, ensured its excellent weldability. In this regard, this steel grade in performance is improved analog 08KH17T, which is recommended as a substitute for steel 12CR18NI10TI 12X18H9T by GOST 5632−72.
General corrosion resistance of steel in many environments to the resistance of austenitic steel 12X18H10T. Unlike Nickel-containing austenitic steels of the type 18Cr-10Ni, low carbon chromium ferritic steels are resistant to various sulfur-containing environments. In this connection, products from steel AISI 430 (wire mesh, etc.) can be used in systems pumping of oil, gas, clean oil, various hydrocarbons in process units of oil refining and gas processing. When using the steel is preferable to any individual tests for corrosion resistance, determined by the temperature, load, contact with other materials, the degree of contact with technological environments, the duration of continuous operation, the aggressive influence of disinfecting and/or cleaning solutions, abrasive products and the influence of other specific conditions.
Steel AISI 430 has the additional advantage that distinguishes it from the contrast Nickel austenitic grades — this insensitivity to intergranular corrosion in the temperature range 500−800°C, and has a much lower sensitivity to cracking chloride.
Comparative properties of steels 12CR18NI10TI and AISI 430.
|Mark||Heat capacity specific (j/g •K) at 20 °C||Magnetic quality||The average coefficient of thermal expansion (106 °C-1).||Thermal conductivity at 20 °C (W/ m •K)||Resistance to chloride stress-corrosion cracking, MPa|
|AISI 430||0,44||Yes (ferromagnetic)||10||25||350|
Quality AISI 430 at high temperatures
Steel grade AISI 430 is not hardened by heat treatment and has good resistance to scale formation, while maintaining the beneficial mechanical properties to high temperatures. Steel AISI 430 can be operated up to a temperature of 850 °C, however, the duration and temperature depend on the aggressiveness of the environment.
Use of the steel due to the low coefficient of thermal expansion, is optimal for products, experiencing temperature changes, and high thermal conductivity determines its application in heat exchange systems. Having relatively low thermal inertia (specific heat) steel AISI 430 with the least energy consumption, can more quickly warmed and cooled, which gives the opportunity to avoid a possible inertial overheating. Steel grade 430 is widely used in such industries as:
-architecture and design;
-production of kitchen utensils, parts washing machines, sinks, serving tools, tables, sinks, pallets and drums for washing machines, etc.;
-production of internal and external accessories;
-equipment for heat exchangers;
Use sparingly-alloyed Nickel-free stainless steels (ie analogues 430) in the processing and food industries regulated by standards and other normative documents. Main GOST 5632 «stainless steel» also reglementary the use of chromium ferritic steel 08KH17T 12X17 and as substitutes for chromium-Nickel austenitic steel type 12X18H10T and 12X18H9T, including for food processing equipment, manufacturing kitchen utensils and household items.
Ferritic steels such as AISI 430, can be used in the manufacture of devices and components for the wine industry. Steel of this type permitted for use in direct contact with wine, wort, cognac alcohol, as well as by-products of winery wastes, etc. allowed the use of these steels (08KH17T) for the production of equipment used in the dairy and beef industries at temperatures 30−140°C, etc.
All-steel series 400, including AISI 430, and can be not only applied as substitutes for Nickel-containing grades, but much exceed them in a number of properties of Steel AISI 430 may be used in the production of technological equipment that is used at various stages in the food industry (hygienic handling or cleaning materials, equipment and products, separation and sorting of products, grinding, blending, packing and packaging, thermal processing, transportation, etc.).
Since chromium steels have a low coefficient of thermal expansion and increased thermal conductivity in comparison to Nickel austenitic steels, this determines their application (including tube rental) to heat exchange structures such as cooling gradeline, etc. Low thermal expansion coefficient provides the most reliable pittingale mount and rapid heat transfer in the cooling system food reservoirs (system with cooling water, glycol and other cooling media). Piping and welded construction of chromium steels resize, the temperature variation is much less, thereby reducing the fatigue loads from temperature change, preventing potential leaks from the hydraulic connections.
Steel 430 fully complies with the sanitary-epidemiological state standards and regulations and is very promising in the application in the production of equipment for processing and food industry: meat, fat, baking, alcohol, beer and soft drinks, confectionery, alcoholic beverage and others. High corrosion resistance of the steel AISI 430 is characterized by a decreased in the carbon composition and high chromium content (16 to 18%).
This steel is proven as a sustainable material in gaseous media, which are formed by the combustion of fuel. AISI 430 is used in the manufacture of pipes and liners recirculation systems, neutralization and exhaust trap exhaust gases. Sophisticated high-temperature catalytic oxidation-reduction reactions and corrosive gas environment determine an indispensable application of corrosion-resistant economically-alloyed steel 430 in the form of structural material in the manufacture of exhaust systems, furnace and other related equipment (chimneys, exhaust ducts, etc.). Such environments may contain products of incomplete combustion (hydrocarbons, carbon monoxide, oxides of nitrogen, hydrogen sulfide, sulfur dioxide, etc.) and complete combustion (water vapor, carbon dioxide, nitrogen, etc.).
Temporary resistance at high temperatures:
|Tensile strength, MPa||145||250||430||450|
This steel is welded by all known methods, subject to the adoption of the post-weld passivation measures, etching/cleaning without losing corrosion properties in welding areas. For optimal use of arc welding in inert gases, you must comply with the minimum energy consumption during the welding of the seam. Recommended welding «on top» (i.e., if the work surface is located below the welding tool). In the form of filler material can be used austenitic wire SV-07CR25NI13, 309L, St-08Х25Н13БТЮ, etc. it is also possible to use electrodes or filler wire basis chromium ferritic steel AISI 430. To ensure adequate corrosion resistance should remove the dross, as well as the color of the tint by etching or mechanical treatment with brushes made of stainless steel and prepassivate with the help of cold solution (10−20%) nitric acid. The next step is a thorough rinsing in cold water and drying.
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