1.4521 - aisi 444 pipe, wire, round
|Mark||Analogue||W. Nr.||Aisi Uns||En||Order|
|02Х18М2БТ||1.4521||444||X2CrMoTi18-2||Delivery from the stock, in stock|
Composition and properties
Steel AISI 444 (1.4521) corresponds to the generally accepted specification EN 10088−2: 2005 (for EU countries) and ASTM A 240−08 (for USA). It includes the following chemical elements:
|Content,%||0.02||18.0||2.0||Together — 0.5||Basis base|
Due to the reduced carbon content, the steel in the rolling state has a purely ferrite structure. When carrying out the primary heat treatment — annealing — AISI 444 steel (1.4521) exhibits weak ferromagnetic properties. The alloy has a density of 7.7 g / cm 3, and has a low value of the coefficient of thermal expansion: in the temperature range from 20 to 100 0 C it is only 10.4 x 10 -6 1 / K. This material is also characterized by high thermal conductivity, which is completely preserved in the temperature range 20… 200 0 С. The thermal conductivity coefficient is 23 W / mK, and the modulus of elasticity is 220 GPa.
A distinctive feature of AISI 444 steel (1.4521) is its increased corrosion resistance, which is preserved even with the simultaneous presence of especially active gaseous media that cause corrosion — hydrochloric and sulfuric acid vapors. For these characteristics, the alloy is almost identical to acid-resistant steels of austenitic grade, in particular, AISI 316 (1.4404), whose smelting is economically much more expensive. At the same time, with prolonged exposure to high temperatures and increased concentrations of aggressive vapors on the inner surface of the pipes, pitting-corrosion centers may appear. This should be taken into account when using this steel as a material for gas and pipelines.
Pipes, a circle and a wire from the given alloy are made by traditional methods of cold and / or hot rolling. The advantage of steel (in comparison, for example, with steel AISI 444) is a lower dependence on the accuracy of compliance with the modes of hardening treatment. This allows consumers to reduce their current operating costs.
A distinctive feature of the alloy in question is its two-component stabilization, which is produced by the combined action of niobium and titanium in the smelting process. Therefore, the steel AISI 444 (1.4521) is steadily processed on metal-cutting and deforming equipment, in cold and hot conditions. Wire and a circle of this alloy can be dragged with significant degrees of deformation, and can be cold-set on multi-position automatic machines, to obtain fasteners. The conditions for welding steel do not differ from other materials of this class.
Pipes made of steel AISI 444 (1.4521) are used in the manufacture of pipelines that pump chemically active media, which can be accompanied by intense corrosion phenomena. The circle and wire from this alloy are used in the manufacture of precision parts of instrumentation in the pharmaceutical, chemical and metallurgical industries.
Domestic metallurgy produces an alloy 02X18M2BT, which in its composition practically does not differ from steel AISI 444 (1.4521).
Pipes, a circle and a wire from steel AISI 444 (1.4521), offered to realization by the company Electrovek-steel is the absolute quality guarantee that is confirmed by certificates applied to each party of hire.