The use of alloy 06XH28MDT
Alloy 06KHN28MDT is used for the manufacture of welded chemical equipment (reactors, heat exchangers, pipelines, tanks) operating at temperatures up to 80 ° C in sulfuric acid (except 55%), extraction phosphoric, acetic and other highly aggressive media in the production of complex mineral fertilizers. The alloy is smelted in electric arc furnaces.
The chemical composition of the alloy 06XH28MDT
| C | Cu | Cr | Fe | Mn | Mo | Ni | P | S | Si | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
| ≤0,06 | 22-25 | 2,5-3,5 | Ост. | ≤0,8 | 2,5-3 | 26-29 | ≤0,035 | ≤0,02 | ≤0,8 | 0,5-0,9 |
Physical properties of the alloy 06XH28MDT
- Density - 7.96 · 103 kg / m3.
- Thermal conductivity - 0.134 · 10² W / (m · K) at 20 ° С.
- The electrical resistivity is 0.75 · 106, Ohm · m at 20 ° C.
- The specific heat is 1.255 · 103, J / (kg · K) at 20 ° C.
- Modulus of elasticity (E), thermal conductivity coefficient (λ), temperature coefficient of linear expansion (α).
| t isp,°С | Е · 10-4 N / mm2 | λ, W / (m K) | t isp, °С | α · 106, К-1 | t isp, °С | Е · 10-4 N / mm2 | t isp, °С | λ, W / (m K) | t isp, °С | α · 106, К-1 |
|---|---|---|---|---|---|---|---|---|---|---|
| 100 | 19,1 | 13,4 | 20-100 | 10,9 | 600 | 15,6 | 24,1 | 20-600 | 15,25 | |
| 200 | 18,61 | 15,1 | 20-200 | 12,85 | 700 | 15,11 | 25,4 | 20-700 | 16,8 | |
| 300 | 17,86 | 17,1 | 20-300 | 13,6 | 800 | 14,53 | 26,1 | 20-800 | 16,25 | |
| 400 | 17,06 | 92,7 | 20-400 | 14,4 | - | - |
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20-900 | 16,80 | |
| 500 | 16,1 | 21,7 | 20-500 | 14,85 |
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Corrosion Resistance of Alloy 06XH28MDT
According to GOST 5949-75, GOST 7350-77, GOST 4986-79, GOST 9940-81 and GOST 9941-81, the alloy must not be prone to intergranular corrosion according to methods B and VU GOST 6032-89 with a test duration of 144 in the control solution, respectively and 48 hours; according to GOST 5582-75, testing is provided only by method B.
Before testing, the alloy is subjected to provocative heating at 700 ° C for 20 min according to GOST 5949-75, GOST 7350-77 and heating at 650 ° C for 1 h according to GOST 5582-75. The corrosion rate of the alloy in sulfuric acid at 80 ° C based on 100 hours of testing.
| H2SO4, % | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
|---|---|---|---|---|---|---|---|---|---|
| ν cor, g / (m²·h) | 0,015 | 0,0080 | 0,230 | 0,140 | 0,009 | 0,20 | 1,14 | 0,31 | 0,27 |
Alloy Welding 06XH28MDT
Alloy 06XH28MDT is welded manually and automatically by shielding gas and using flux. In manual electric arc welding, OZL-17U and OZL-37-2 electrodes with a rod of wire Sv-OZHN25MDGB and Sv-03KhN25MDG are used. In automatic electric arc welding, as well as argon arc welding, the same filler material is used. The brand AN-18 is recommended as a flux.
| Sheet thickness, mm | Size, mm |
|---|---|
| 0,8 | 460x910 |
| 0,8 | 500x1400 |
| 0,8 | 900x950 |
| 10 | 400x750 |
| 12 | 500x1400 |
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