Relevance
Alloy grade 03KhN28MDT (EP516)) is used in the manufacture of welded equipment for the production of any concentration of sulfuric acid, phosphoric acid extraction, nitrophos production, as well as other compounds with high aggressiveness. The main difference between 03XHN28MDT and 06XHN28MDT is that the former has a higher resistance against intergranular corrosion of welded joints andAlloy 03CrN28MDT 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 - susceptibility to burr, processability are similar to those of 06KhN28MDT.
Chemical composition:
| C |
Cr |
Cu |
Fe |
Mn |
Mo |
Ni |
P |
S |
Si |
Ti |
|---|
| ≤0,03 |
From 22 to 25 |
2.5 to 3.5 |
Ost. |
≤0,8 |
2.5 to 3 |
26 to 29 |
≤0,035 |
≤0,02 |
≤0,8 |
0.5 to 0.9 |
Mechanical properties at 20 °С
| GOST, TU |
Products |
σ in, N/mm² |
σ0,2, N/mm² |
δ5, % |
|---|
| In accordance with GOST 5949-75 |
Rods |
As agreed |
|
|
| In accordance with GOST 7350-77 |
Hot-rolled sheets |
550 |
220 |
35 |
| As per TU 14-1-756-73 |
Cold-rolled sheets |
>550 |
220 |
35 |
Mechanical properties at high temperature (12 mm thick sheet, hardening process with 1050 °C in water)
| tisp, °C |
σ0.2, N/mm² |
σc, N/mm² |
δ5, % |
ψ, % |
n, r |
M kr, N - m |
|---|
| 800 |
160 |
190 |
>64 |
66 |
2,5 |
34 |
| 900 |
85 |
95 |
85 |
77 |
7,8 |
24 |
| 1000 |
40 |
60 |
81 |
65 |
12,6 |
18 |
| 1100 |
25 |
40 |
54 |
47 |
12,6 |
11 |
| 1200 |
25 |
30 |
54 |
43 |
13,8 |
80 |
Physical properties at t ° 20 ° C
The density is 7.96 g/cm3; magnetic permeability in the 500 E field = 1.255 (μTl - m)/A; specific electrical resistance is 0.75 Ohm-mm2/m, and thermal conductivity is about 0.134 - 10² W/(m - K). The values of modulus of elasticity (E), thermal coefficient of linear expansion (α), and thermal conductivity coefficient (λ) are given below.
| tisp |
E - 10-4 N/mm2 |
λ, W/(m - K) |
thisp |
α - 106, К-1 |
thisp |
E - 10-4 N/mm2 |
λ, W/(m - K) |
thisp |
α - 106, К-1 |
|---|
| 100°С |
19,1 |
13,4 |
From 20 to 100°C |
10,9 |
600°С |
15,6 |
24,1 |
From 20 to 600°C |
15,25 |
| 200°С |
18,61 |
15,1 |
From 20 to 200°C |
12,85 |
700°С |
15,11 |
25,4 |
20 to 700°C |
16,8 |
| 300°С |
17,86 |
17,1 |
From 20 to 300°C |
13,6 |
800°С |
14,53 |
26,1 |
20 to 800°C |
16,25 |
| 400°С |
17,06 |
92,7 |
20 to 400°C |
14,4 |
- |
- |
|
From 20 to 900°C |
>16,8 |
| 500°С |
16,1 |
21,7 |
From 20 to 500°C |
14,85 |
|
|
|
|
|
Corrosion resistance
According to GOST 5949-75 and GOST 7350-77 steel 03ХН28МДТ must have resistance to intergranular corrosion by the method of B and VU GOST 6032-89 (duration of testing in a control solution of 144 hours and 48 hours, respectively). TU 14-1-756-73 normalizes such tests by method B. The tests are carried out after provoking heating at 700 °C for 60 minutes (GOST 5949-75 and 7350-77), and 20 minutes (TU 14-L756-73). If we compare with the alloy 06ХН28МДТ, the low-carbon alloy 03ХН28МДТ has a higher resistance against intergranular corrosion in welded joints. And their resistance to general corrosion is similar. Corrosion resistance in sulfuric acid (different concentrations) at 80°C is given below
| H2 SO4, % |
νcor, g/(m²-h) |
|---|
| 10 |
0,015 |
| 20 |
0,008 |
| 30 |
0,23 |
| 40 |
0,14 |
| 50 |
0,009 |
| 60 |
0,2 |
| 70 |
1,14 |
| 80 |
0,31 |
| 90 |
0,27 |
Process parameters
The temperature range of 06CrNi28MdT hot deformation for forging, forging and rolling is 1170-900°C. The alloy is satisfactorily machined by cutting. Alloy 03CrN28MdT is satisfactorily welded by electric arc, argon arc manual and automatic welding. As an additive material is always used wire Sv-01HN28MDT during manual arc welding electrodes OZL-17U, during automatic arc welding - flux AH-18.
Buy at best price
At the warehouse of Evek GmbH a wide range of products of KhN78T brand of standard and non-standard parameters. Prices are due to the technological characteristics of production without the inclusion of additional costs. All products are certified. With us it is easy to buy the necessary products in bulk for large-scale projects, we also offer favorable conditions for retail customers. If you are interested in our offer, contact the nearest office. Terms of realization of orders are minimal. Wholesale customers get discounts.
