Steel R18
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Р18 |
| Designation GOST Latin |
P18 |
| Transliteration |
R18 |
| The chemical elements |
- |
Description
Steel R18 applies: cutters, drills, mills, thread milling cutters, shaper cutters, reamers, core drills, taps, broaches for processing of structural steels with strength up to 1000 MPa, which are required to save cutting properties when heated during operation up to +600 °C.
Note
The steel has a reduced tendency to overheat during hardening.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006 |
| Sheets and stripes |
В33 |
GOST 4405-75, TU 14-1-1408-75, TU 14-1-3508-82 |
| Sectional and shaped rolling |
В32 |
GOST 7417-75, GOST 14955-77, GOST 19265-73, TU 14-19-34-87, TU 14-11-245-88 |
| Steel wire medium- and high-carbon |
В72 |
TU 14-1-2783-79 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
W |
Co |
| GOST 19265-73 |
0.73-0.83 |
≤0.03 |
≤0.03 |
0.2-0.5 |
3.8-4.4 |
0.2-0.5 |
≤0.6 |
The rest |
≤0.25 |
1-1.4 |
≤1 |
17-18.5 |
≤0.5 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
HRC |
| Rolled steel. Delivery condition |
|
- |
≥510 |
≥840 |
≥8 |
≥10 |
- |
| Quenching in oil from 1280 °C to + Leave three-time (delayed by 1 hrs) |
| - |
400 |
- |
≥1370 |
- |
- |
≥61 |
| - |
500 |
- |
≥1470 |
- |
- |
≥63 |
| - |
550 |
- |
≥2350 |
- |
- |
≥66 |
| - |
600 |
- |
≥2210 |
- |
- |
≥65 |
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 |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
| 20 |
228 |
83 |
8800 |
- |
419 |
| 100 |
223 |
- |
- |
26 |
472 |
| 200 |
219 |
- |
- |
27 |
544 |
| 300 |
210 |
- |
- |
28 |
627 |
| 400 |
201 |
- |
- |
29 |
718 |
| 500 |
192 |
- |
- |
28 |
815 |
| 600 |
181 |
- |
- |
27 |
922 |
| 700 |
- |
- |
- |
27 |
1037 |
| 800 |
- |
- |
- |
- |
1152 |
| 900 |
- |
- |
- |
- |
1173 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| G |
Modulus of elasticity shear torsion |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
When butt welding with steel 45 and 40CR good. |
| Forging temperature |
Start - 1200 °C, the end of - 900 °C. Cooling in the wells at 750-800 °C. |
| Grindability |
Increased (GOST 19265-73). |
| Viscosity |
Good. |
| Resistance to wear |
Good. |
