03HN28MDT brand alloy (EP516)) is used in the manufacture of welded equipment for production of sulfuric acid at any concentration, extraction phosphoric acid nitrofosa production, as well as other compounds increased aggressiveness. The main difference between 03HN28MDT and 06HN28MDT is that the former has a higher resistance to intergranular corrosion of the weld and the base metal, working in hostile environments at t ° up to 80 ° C, Alloy 03HN28MDT produced according to 1) TU 14−1-756- 73; 2) GOST 5632−72; 3) GOST 7350−77; 4) GOST 5949−75. Physical and mechanical properties of the alloy tendency to work hardening, workability similar 06HN28MDT
|≤0,03||From 22 to 25||2.5 to 3.5||Ost.||≤0,8||2.5 to 3||From 26 to 29||≤0,035||≤0,02||≤0,8||0.5 to 0.9|
Mechanical properties at 20 ° C
|GOST, TU||products||Rm N / mm²||σ0,2, N / mm²||δ5,%|
|In accordance with GOST 5949−75||rods||By agreement|
|In accordance with GOST 7350−77||Hot rolled sheets||550||220||35|
|According to TU 14−1-756−73||Cold rolled sheets||> 550||220||35|
The mechanical properties at high temperature (12 mm tlschinoy sheet, the process of quenching from 1050 ° C in water)
|tisp, ° C||σ0,2, N / mm²||Rm N / mm²||δ5,%||ψ,%||n, of||M cr, N · m|
Physical properties at t ° 20 ° C
Its density is 7.96 g / cm3; the magnetic permeability in the field of 500 E = 1.255 (mT · m) / A; electrical resistivity of 0.75 ohm mm2 / m and thermal conductivity — about 0,134 · 10² W / (m · K). Below are the values of the elastic modulus (E), the temperature coefficient of linear expansion (α), the thermal conductivity (λ).
|tisp||E x 10 -4 N / mm2||λ, W / (m · K)||tisp||α · 106, K-1||tisp||E x 10 -4 N / mm2||λ, W / (m · K)||tisp||α · 106, K-1|
|100 ° C||19.1||13.4||From 20 to 100 ° C||10.9||600 ° C||15.6||24.1||From 20 to 600 ° C||15.25|
|200 ° C||18.61||15.1||From 20 to 200 ° C||12.85||700 ° C||15,11||25.4||From 20 to 700 ° C||16.8|
|300 ° C||17.86||17.1||From 20 to 300 ° C||13.6||800 ° C||14.53||26.1||From 20 to 800 ° C||16.25|
|400 ° C||17.06||92.7||From 20 to 400 ° C||14.4||-||-||From 20 to 900 ° C||> 16.8|
|500 ° C||16.1||21.7||From 20 to 500 ° C||14.85|
In accordance with GOST 5949−75 and GOST 7350−77 Steel 03HN28MDT must be resistant to intergranular corrosion by the method B and VU GOST 6032−89 (the duration of the test in the control solution of 144 hours and 48 hours, respectively). TU 14−1-756−73 normalizes such a test method B. Tests are (GOST 5949−75 and 7350−77) after provoking heating at 700 ° C for 60 minutes, and 20 minutes (TS 14-L756−73). When compared with the alloy 06HN28MDT, the low carbon alloy 03HN28MDT has welded joints higher resistance to intergranular corrosion. Their resistance to general corrosion is similar. Below the corrosion resistance in sulfuric acid (different concentrations) at 80 ° C
|H 2 SO 4,%||νkor g / (m ² · h)|
The interval of temperature of hot deformation 06HN28MDT at stamping, forging and rolling of 1170−900 ° C. Alloy cutting handled satisfactorily. Alloy brand 03HN28MDT satisfactorily welded types of welding such as arc, argon manual and automatic. As the filler material, all used wire Sv-01HN28MDT; during manual arc welding are used electrodes RLA-17U; during automatic arc — flux AN-18.
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