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 |
