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Steel 51HFA

70G steel Steel 60S2HFA Steel 60KhFA (60KhF) Steel 65 Steel 65G (65G1) Steel 65GA Steel 65S2VA Steel 68A Steel 68GA Steel 70 Steel 60S2HG Steel 70G2 Steel 70S2HA (EI142) Steel 70C3A 70KhGFA steel Steel 75 Steel 80 Steel 85 KT-2 steel KT-3 steel Steel 55S2A Steel 3K-7 Steel 40P Steel 50RA (50P) 50KhG steel 50KhGA steel 50KhGFA steel Steel 50KhFA (50KhF) 51KhFA steel Steel 55C2 Steel 60С2Х (60С2ХА; 60С2ХАA) Steel 55S2GF Steel 55KhGR Steel 55KhFA (55KhF) 60G steel Steel 60C2 Steel 60S2A Steel 60S2G Steel 60C2H2A

Designation

Name The value
Designation GOST Cyrillic 51ХФА
Designation GOST Latin 51XFA
Transliteration 51HFA
The chemical elements 51CrV

Description

51HFA steel is used: for the production of wire rod, ribbon used for the manufacture of heavy-loaded critical parts, which are requirements of high fatigue strength; heat-treated wire diameter 1.2−5.5 mm, intended for the production of cylindrical compression springs.

Note

Steel spring alloy of high quality.

Standards

Name Code Standards
Steel wire medium- and high-carbon В72 GOST 1071-81, GOST 26366-84, TU 14-4-238-72
Sectional and shaped rolling В32 GOST 14959-79, TU 14-1-1607-76, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Steel alloy wire В73 GOST 14963-78, TU 14-4-1130-81, TU 14-4-70-72
Classification, nomenclature and general norms В20 OST 1 90005-91
Tapes В34 TU 14-173-180-89, TU 14-4-843-77

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V
GOST 14959-79 0.47-0.55 ≤0.025 ≤0.025 0.3-0.6 0.95-1.2 0.15-0.3 ≤0.25 The rest ≤0.2 0.15-0.25
Fe is the basis.

Mechanical characteristics

Section, mm σB, MPa y, % HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- 1520-1720 - 44-48
The wire spring heat-treated in the delivery condition according to GOST 1071-81
1.2-5.5 2060-1270 - -
Wire with special surface finishes for the manufacture of springs cold-wound in the delivery condition according to GOST 14963-78 (in brackets the value - at customer's request)
0.5-14 ≤1030 (≤780) - -
Wire with special surface finishes for the manufacture of springs by cold winding according to GOST 14963-78. Samples heat-treated
0.5-14 ≥1470 ≥40 -

Description mechanical marks

Name Description
Section Section
σB Limit short-term strength
y The relative narrowing
HRC Rockwell hardness (indenter diamond spheroconical)

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