Steel 70HGFA
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 | 70ХГФА |
| Designation GOST Latin | 70XGFA |
| Transliteration | 70HGFA |
| The chemical elements | 70CrMnV |
Description
70HGFA steel is used: for the production of wire rod and heat-treated wire diameter 1.2−5.5 mm, intended for the manufacture of springs; valve springs car engine.
Note
Chrome vanadium spring steel
Standards
| Name | Code | Standards |
|---|---|---|
| Steel wire medium- and high-carbon | В72 | GOST 1071-81, TU 14-4-1380-91 |
| Sectional and shaped rolling | В32 | TU 14-1-4104-86 |
| Bulls. Blanks. Slabs | В31 | TU 14-134-326-93 |
Chemical composition
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | Al | V |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TU 14-134-326-93 | 0.65-0.72 | ≤0.015 | ≤0.015 | 0.5-0.8 | 0.3-0.5 | 0.15-0.3 | ≤0.15 | The rest | ≤0.1 | - | 0.1-0.2 |
| GOST 1071-81 | 0.65-0.72 | ≤0.025 | ≤0.025 | 0.5-0.8 | 0.3-0.5 | 0.15-0.3 | ≤0.2 | The rest | ≤0.15 | ≤0.05 | 0.1-0.2 |
Fe is the basis.
According to GOST 1071-81 the chemical composition is given for steel grade 70HGFA.
According to TU 14-1-4104-86, TU 14-134-326-93 the chemical composition is given for steel grade 70HGFA-III. Deviations from the standards of chemical composition in finished rolled products are in accordance with GOST 14959, except copper. The deviation in content of copper in steel is no more than +0,020%.
According to GOST 1071-81 the chemical composition is given for steel grade 70HGFA.
According to TU 14-1-4104-86, TU 14-134-326-93 the chemical composition is given for steel grade 70HGFA-III. Deviations from the standards of chemical composition in finished rolled products are in accordance with GOST 14959, except copper. The deviation in content of copper in steel is no more than +0,020%.
Mechanical characteristics
| Section, mm | σB, MPa |
|---|---|
| Rod in the supply position on the other 14-1-4104-86 | |
| - | ≤1270 |
| The wire spring heat-treated in the delivery condition according to GOST 1071-81 | |
| 1.2-5.5 | 2060-1270 |
Description mechanical marks
| Name | Description |
|---|---|
| Section | Section |
| σB | Limit short-term strength |
Technological properties
| Name | The value |
|---|---|
| Macrostructure and contamination | The macrostructure of the wire rod according to TU 14-1-4104-86 should not have traces of shrinkage, axial looseness, cracks, inclusions and placenow, bundles. Pollution steel non-metallic inclusions on the average score must not exceed the sulphides and the silicates 1 point each, oxides 1.5 points. The maximum score of non-metallic inclusions of all types should not exceed 2 points. |
| Microstructure | The microstructure of wire rod, on the other 14-1-4104-86 should consist of perlite 1-3 points on a scale of 1 to GOST 8233. In the surface layer of the wire rod is not allowed the presence of the structure of sorbitol vacation. Martensitic and toostonedtocare areas are not allowed. The average depth bezoperatsionnogo layer (ferrite + transition zone) of the rod surface must not exceed 2% at maximum depth of not more than 2.5% of the diameter. |
