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Steel 15K

Designation

Name The value
Designation GOST Cyrillic 15К
Designation GOST Latin 15K
Transliteration 15K
The chemical elements 15

Description

15K steel is used: for the manufacture of flanges, bottoms, one-piece forged and welded drums of steam boilers, buildings vehicles and other parts of the boiler and vessels working under pressure at temperatures up to +450 °C.

Note

In accordance with GOST 5520−79 with 01.01.1991 steel stamps 12K is not allowed to use in the newly created and upgraded technology.

Standards

Name Code Standards
Sheets and stripes В23 GOST 5520-79, GOST 19903-74, GOST 19903-90

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2
Steel hot-rolled sheet in the delivery condition
21-40 ≥220 ≥380 ≥25 - ≥735
4-20 ≥230 ≥380 ≥25 - ≥784
41-60 ≥210 ≥380 ≥25 - ≥686
Leaves categories: 2-4, 10, 16, 18-21 (KCU - as supplied / after mechanical aging)
≤5 ≥225 370-480 ≥27 - -
21-40 ≥215 370-480 ≥26 - ≥637/294
41-60 ≥205 370-480 ≥25 - ≥686/294
5-20 ≥225 370-480 ≥27 - ≥686/343
Casting as supplied. Without heat treatment
- ≥200 ≥400 ≥24 ≥35 ≥490
Sheet gracieacademy (specified time and temperature of exposure)
- ≥225 ≥370 ≥33 ≥74 -
- ≥200 ≥320 ≥40 ≥76 -
- ≥180 ≥350 ≥34 ≥73 -
Sheets hot rolled 37-40 mm
- ≥225 ≥420 ≥30 ≥56 -
- ≥195 ≥390 - - -
- ≥195 ≥470 - - -
- ≥165 ≥470 - - -
- ≥160 ≥370 - ≥60 -
- ≥155 ≥250 - ≥61 -
Sheets hot rolled 37-40 mm. Annealing at 880-900 °C
- ≥245 400-430 ≥30 55-60 -
- 180-225 350-500 17-28 43-62 -
- 145-185 350-510 ≥24 52-60 -
- 140-175 320-400 22-33 60-73 -
- 120-150 200-270 24-33 71-83 -
- 69-98 110-150 36-48 84-91 -

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
kJ/m2 Toughness

Physical characteristics

Temperature Е, ГПа G, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
500 176 66 7710 - 601 136 525
600 162 59 7670 38 758 136 584

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 Welded without any restrictions. The welding methods of SMAW, ADS under flux and gas protection.
Propensity to temper brittleness tend not
Forging temperature Start - 1260 °C, the end - 750 °C.
Flock-sensitive sensitivity not sensitive
Workability by cutting In a normalized state in HB 121-126 and blower SB=390 MPa Kn TV.SPL.=1.50 Kn b.St.=1.35

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