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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.

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