Steel 20KH1M1F1BR (ЭП44)
Designation
Name |
The value |
Designation GOST Cyrillic |
20Х1М1Ф1БР |
Designation GOST Latin |
20X1M1F1BP |
Transliteration |
20H1M1F1BR |
The chemical elements |
20Cr1Mo1V1NbB |
Name |
The value |
Designation GOST Cyrillic |
ЭП44 |
Designation GOST Latin |
EP44 |
Transliteration |
EhP44 |
The chemical elements |
- |
Description
20KH1M1F1BR steel is used: for the production of fasteners with special operating characteristics; fasteners turbines and flange connections, steam pipes and equipment and parts with operating temperature up to 500−580 °C.
Note
Steel pearlitic class.
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 |
Sheets and stripes |
В33 |
GOST 4405-75 |
Sectional and shaped rolling |
В32 |
GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 20072-74, TU 14-1-552-72, TU 14-11-245-88 |
Chemical composition
Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
B |
Ti |
Mo |
Nb |
W |
Ce |
GOST 20072-74 |
0.18-0.25 |
≤0.03 |
≤0.03 |
0.5-0.8 |
1-1.5 |
≤0.37 |
≤0.3 |
The rest |
- |
0.7-1 |
≤0.005 |
≤0.06 |
0.8-1.1 |
0.05-0.15 |
≤0.2 |
0.05-0.1 |
TU 14-1-552-72 |
0.18-0.25 |
≤0.03 |
≤0.03 |
0.5-0.8 |
1-1.5 |
≤0.37 |
≤0.45 |
The rest |
≤0.3 |
0.7-1 |
≤0.005 |
≤0.06 |
0.8-1.1 |
0.05-0.15 |
- |
0.05-0.1 |
Fe is the basis.
According to GOST 20072-74, when steel is scrap-process, the content of Cu ≤ 0.30%. Tungsten is allowed up to 0.20%. When smelting steel by the method of electroslag remelting, the mass fraction of sulfur should not be more than 0.015%.
According to TU 14-1-552-72, the chemical composition is given for steel grades 20Х1М1Ф1БР (ЭП44) and 20Х1М1Ф1БР-Ш (ЭП44-Ш).
Mechanical characteristics
Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Bars hot rolled and forged (12-180 mm). Normalization at 1030-1050 °C, air cooling + Speed vacation: at 600 °C (extract 3 hours) at 700-720 °C (exposure 6 h), air cooling |
|
≥670 |
≥780 |
≥14 |
≥50 |
≥590 |
Rolled steel. Quenching in oil with 970-990 °C + Vacation 680-720 °C (exposure 6 h), air cooling |
|
≥665 |
≥780 |
≥14 |
≥50 |
≥579 |
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 |
r, кг/м3 |
l, Вт/(м · °С) |
20 |
217 |
7900 |
- |
100 |
211 |
- |
41 |
200 |
205 |
- |
461 |
300 |
196 |
- |
482 |
400 |
188 |
- |
502 |
500 |
180 |
- |
528 |
600 |
167 |
- |
544 |
700 |
152 |
- |
561 |
A description of the physical symbols
Name |
Description |
Е |
The normal elasticity modulus |
r |
Density |
l |
Coefficient of thermal conductivity |
R |
UD. the resistivity |