Steel 51HFA

Designation

Name The value
Designation GOST Cyrillic 51ХФА
Designation GOST Latin 51XFA
Transliteration 51HFA
By 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
Bars and shapes В32 GOST 14959-79, TU 14-1-1607-76, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Wire, steel, alloy В73 GOST 14963-78, TU 14-4-1130-81, TU 14-4-70-72
Classification, nomenclature and General rules В20 OST 1 90005-91
Tape 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 Rest ≤0.2 0.15-0.25
Fe is the basis.

Mechanical properties

Section, mm σU, 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
σU Limit short-term strength
y The relative narrowing
HRC Rockwell hardness (indenter diamond spheroconical)