Steel 15K

Designation

Name The value
Designation GOST Cyrillic 15К
Designation GOST Latin 15K
Transliteration 15K
By 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 strips В23 GOST 5520-79, GOST 19903-74, GOST 19903-90

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Steel hot-rolled sheet in the delivery condition
21-40 ≥220 ≥380 ≥25 - ≥735
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 -
- ≥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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
0 207 78 7850 - - - -
20 211 - 7870 - 200 - -
100 204 77 7840 57 219 - 486
200 201 76 7810 53 292 119 470
300 196 73 7780 - 381 128 483
400 187 69 7740 45 487 132 533
500 176 66 7710 - 601 136 525
600 162 59 7670 38 758 136 584
700 - - 7630 - 925 - 571
900 - - 7610 - 1135 - 703
1000 - - 7550 - 1167 - 695
1100 - - 7490 - 1194 - 691
800 - - - - 1094 139 703
1200 - - - - 1219 - 687

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.
Склонность к отпускной хрупкости tend not
The temperature of forging Start - 1260 °C, the end - 750 °C.
Flock-sensitive sensitivity not sensitive
Machinability In a normalized state in HB 121-126 and blower SB=390 MPa Kn TV.SPL.=1.50 Kn b.St.=1.35