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Steel 9Х2МФ (9Х2МФА)

Designation

Name The value
Designation GOST Cyrillic 9Х2МФ
Designation GOST Latin 9X2MF
Transliteration 9H2MF
The chemical elements 9Cr2MoV
Name The value
Designation GOST Cyrillic 9Х2МФА
Designation GOST Latin 9X2MFA
Transliteration 9H2MFA
The chemical elements 9Cr2MoV

Description

9Х2МФ steel is used: for the manufacture of working rolls of cold rolling of metals, in particularly severe conditions; the work rolls of wire cogging and section rolling mills; other important products with improved service characteristics.

Standards

Name Code Standards
Machines and equipment for metallurgical and foundry industry Г44 OST 24.013.04-90, OST 24.013.20-90, OST 24.013.21-85
Sectional and shaped rolling В32 TU 14-19-100-90
Metal forming. Forgings В03 TU 4121-002-33902054-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo
OST 24.013.04-90 0.85-0.95 ≤0.03 ≤0.03 0.2-0.7 1.7-2.1 0.25-0.5 ≤0.5 The rest ≤0.25 0.1-0.2 0.2-0.3
TU 14-19-100-90 0.85-0.95 ≤0.01 ≤0.025 0.2-0.35 1.7-2.1 0.25-0.45 ≤0.3 The rest ≤0.25 0.1-0.3 0.2-0.3
Fe is the basis.
According to OST 24.013.04-90 the chemical composition is given for steel grade 9X2MF.
According to TU 14-19-100-90 the chemical composition is given for steel grade 9Х2МФ-Ш. The total content of nickel and copper should not be more than 0.50%. Permissible deviations from the norms of chemical composition - according to GOST 5950.

Mechanical characteristics

sT|s0,2, MPa σB, MPa d5, % y, %
A sample with a diameter of 6 mm, length 30 mm forged and annealed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
≥100 ≥135 ≥47 ≥91
≥105 ≥135 ≥51 ≥95
≥41 ≥50 ≥53 ≥100
≥21 ≥30 ≥75 ≥100
≥11 ≥12 ≥71 ≥100
≥125 ≥160 ≥45 ≥83

Description mechanical marks

Name Description
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

Physical characteristics

Temperature r, кг/м3 l, Вт/(м · °С) С, Дж/(кг · °С)
20 7840 - -
100 - 37 440
200 - 34 460
300 - 32 500
400 - 32 570
500 - 32 680
600 - 30 800
700 - 23 940
800 - 20 1100
900 - 14 500
1000 - - 500
1200 - - 500

A description of the physical symbols

Name Description
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability Does not apply to welded structures.
Propensity to temper brittleness Inclined.
Forging temperature Start - 1180 °C, the end - of 800 °C. the cross Sections up to 300 mm are cooled in the pit.
Flock-sensitive sensitivity Sensitive.
Workability by cutting In the annealed condition with NV 170-207 and blower SB=610 MPa Kn TV.SPL.=0,85 Kn b.St.=0,80.
Macrostructure and contamination In microtracker steel bars under the control of the etched templeto should not be the remnants of shrinkage and podnasadochnogo looseness, birdhouses, cracks, subcortical bubbles, delaminations, placenow, foreign non-metallic and slag inclusions, visible without using the magnifying devices. Allowed the Central porosity, point heterogeneity, liquation Pousada segregated square, common spotted liquation - small 1 mark for each parameter; layer-by-layer crystallization and the light loop - no more than 3 points.
Microstructure Microstructure of steel bars shall conform to the following standards: microporosity is not allowed; carbide liquation - not more than 2 points; structural (carbide) banding - no more than 4 points.

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