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Steel 20KH1M1F1BR (ЭП44)

Steel 20Х1М1Ф1БР (EP44) Steel 25Х1М1ФА (Р2МА; 25Х1М1Ф)

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

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