Steel 15KH28 (ЭИ349)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
15Х28 |
| Designation GOST Latin |
15X28 |
| Transliteration |
15H28 |
| The chemical elements |
15Cr28 |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ349 |
| Designation GOST Latin |
EI349 |
| Transliteration |
EhI349 |
| The chemical elements |
- |
Description
15KH28 steel is used: for the manufacture of welded structures (as a substitute of steel 12KH18N10T), not exposed to shock loads when the operating temperature is not below -20 °C and for operation in more corrosive environments than steel 08KH17T; details of vacuum equipment; pipes of heat-exchange equipment operating in aggressive environments; the junctions with glass; equipment, parts, pipes pyrolysis plants, heat exchangers, pipes heat-exchange equipment operating in aggressive environments.
Note
Steel heat-resistant and corrosion-resistant ferritic class.
Temperature intense scaling in air 1100−1150 °C.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В23 |
GOST 103-2006 |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Sheets and stripes |
В33 |
GOST 4405-75, GOST 5582-75 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Sectional and shaped rolling |
В32 |
GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 18907-73, TU 3-746-83, TU 14-1-1625-76, TU 14-1-1729-76, TU 14-1-4135-86, TU 14-11-245-88 |
| Pipes steel and connecting parts to them |
В62 |
GOST 9940-81, TU 14-3-1654-89 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, TU 14-1-565-84 |
| Thermal and thermochemical treatment of metals |
В04 |
STP 26.260.484-2004 |
| Tapes |
В34 |
TU 14-1-2275-77, TU 14-1-2289-84 |
| Steel alloy wire |
В73 |
TU 14-1-4611-89 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5632-72 |
≤0.15 |
≤0.025 |
≤0.035 |
≤0.8 |
27-30 |
≤1 |
≤1 |
The rest |
≤0.3 |
≤0.2 |
≤0.2 |
≤0.3 |
≤0.2 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Annealing or vacation at 740-780 °C |
| - |
- |
≥530 |
≥17 |
- |
| Rolled steel. Annealing at 760-780 °C |
| - |
- |
≥530 |
≥30 |
- |
| Bars hot rolled and forged according to GOST 5949-75. Annealing at 680-720 °C, cooling in air or in water or without heat treatment |
|
≥295 |
≥440 |
≥20 |
≥45 |
| Rolled steel. Annealing at 760-780 °C |
| - |
- |
≥11 |
≥147 |
≥100 |
| Bars hot rolled and forged at STP 26.260.484-2004. Annealing at 720-780 °C, cooling in water or air |
|
- |
≥530 |
≥30 |
- |
| Rolled steel. Annealing at 760-780 °C |
| - |
- |
≥19 |
≥153 |
≥99 |
| Seamless hot deformed tubes in the delivery condition according to GOST 9940-81 |
|
- |
≥441 |
≥17 |
- |
| Rolled steel. Annealing at 760-780 °C |
| - |
- |
≥26 |
≥104 |
≥99 |
| - |
- |
≥76 |
≥48 |
≥92 |
| - |
- |
≥170 |
≥60 |
- |
| - |
- |
≥390 |
≥20 |
- |
| - |
- |
≥500 |
≥18 |
- |
| - |
- |
≥460 |
≥22 |
- |
| - |
- |
≥490 |
≥29 |
- |
| - |
- |
≥490 |
≥27 |
- |
| - |
- |
≥8 |
≥139 |
≥100 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
| 0 |
220 |
89 |
7630 |
- |
700 |
- |
| 20 |
200 |
- |
7600 |
- |
- |
- |
| 100 |
216 |
86 |
- |
21 |
- |
10 |
| 200 |
210 |
84 |
- |
22 |
- |
105 |
| 300 |
204 |
80 |
- |
23 |
- |
105 |
| 400 |
193 |
76 |
- |
23 |
- |
- |
| 500 |
184 |
70 |
- |
24 |
- |
11 |
| 600 |
165 |
62 |
- |
25 |
- |
- |
| 700 |
- |
- |
- |
- |
- |
11 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
Limited weldability. Used for welding manual arc welding electrodes type EA-2 and TIG. The welding is preferably carried out with heating to 150-300 °C. |
| Propensity to temper brittleness |
Tend when heated in the range of 520 °C due to excretion of the b-phase. |
| Forging temperature |
Start - 950-1000 °C, the end - of 750-800 °C. the Cooling is produced at the air. |
| Features of heat treatment |
Welded steel products 15X28 should be subjected to annealing at 720-780 °C for 1-2 h, air cooling. Not allowed to leave the products at 450-550 °C, since this leads to the "475 ° embrittlement". |
| Corrosion resistance |
Welded joints of steel 15KH28 prone to intergranular corrosion. |
