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Steel 25Х5М

Designation

Name The value
Designation GOST Cyrillic 25Х5М
Designation GOST Latin 25X5M
Transliteration 25H5M
The chemical elements 25Cr5Mo

Description

25Х5М steel is used: for the manufacture of nitride pump parts, valves, spetskrepezh and other parts which require resistance to oxidation at temperatures up to +600 °C; details of pump-injectors.

Note

Steel martensitic class.
Temperature intense scaling +650 °C.

Standards

Name Code Standards
Sectional and shaped rolling В32 TU 14-1-749-73, TU 14-1-831-74

Chemical composition

Standard C S P Mn Cr Si Ni Fe Mo
TU 14-1-749-73 0.22-0.32 ≤0.03 ≤0.03 0.3-0.7 4-6 ≤0.5 ≤0.5 The rest 0.4-0.6
Fe is the basis.
According to TU 14-1-749-73, the chemical composition is given for steel grade 25Kh5M. Permissible deviations in the content of elements within ± 0.020%, excluding chrome, sulfur and phosphorus, for which deviations are not allowed.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2
Bars hot rolled on the other 14-1-749-73. The longitudinal samples. Quenching in oil with 865-895 °C + Vacation at 570-630 °C, air cooling
≥686 ≥780 ≥8 ≥50 ≥490

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) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
20 210 7750 - 430 - -
100 205 7730 37 - 113 483

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 Difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1200 °C, the end - of 800 °C. the cross Sections up to 800 mm is subjected to annealing by recrystallization and single hypothermia.
Flock-sensitive sensitivity Sensitive.
Machining by cutting In hot-rolled condition, when blower SB HB 170=390 MPa Kn TV.SPL.=Of 2.7 Kn b.St.=2,0.

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