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) |
