Steel 50KHFA (50ХФ)
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 | 50ХФА |
| Designation GOST Latin | 50XFA |
| Transliteration | 50HFA |
| The chemical elements | 50CrV |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 50ХФ |
| Designation GOST Latin | 50XF |
| Transliteration | 50HF |
| The chemical elements | 50CrV |
Description
50KHFA steel is used: for the manufacture of heavy-loaded critical parts, which are requirements of high fatigue strength; springs operating at temperatures to +300 °C; measuring tapes; valve spring compressors, exposed after coiling heat treatment (hardening and tempering).
Note
Steel spring alloy of high quality.
Standards
| Name | Code | Standards |
|---|---|---|
| Sheets and stripes | В23 | GOST 103-2006 |
| Sectional and shaped rolling | В22 | GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Tapes | В34 | GOST 2283-79, TU 14-1-2992-80, TU 14-4-357-73, TU 14-4-469-73, TU 14-4-580-74, TU 14-4-400-73 |
| Steel wire medium- and high-carbon | В72 | GOST 26366-84 |
| Sheets and stripes | В33 | GOST 4405-75, TU 14-1-3196-81, TU 14-1-3396-82 |
| Sectional and shaped rolling | В32 | GOST 7417-75, GOST 7419-90, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 14959-79, TU 14-1-2118-77, TU 14-1-2462-78, TU 14-1-575-73, TU 14-1-658-73, TU 14-1-950-74, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008 |
| Metal forming. Forgings | В03 | GOST 8479-70, ST ЦКБА 010-2004 |
| Bulls. Blanks. Slabs | В31 | TU 14-1-1213-75, TU 1-92-156-90 |
| Pipes steel and connecting parts to them | В62 | TU 14-3-356-75 |
| Steel alloy wire | В73 | TU 14-4-70-72 |
Chemical composition
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | V | Ti | Mo | W |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TU 14-1-950-74 | 0.46-0.54 | ≤0.025 | ≤0.025 | 0.5-0.8 | 0.8-1.1 | 0.17-0.37 | ≤0.3 | The rest | ≤0.25 | 0.1-0.2 | ≤0.03 | ≤0.15 | ≤0.2 |
| GOST 14959-79 | 0.46-0.54 | ≤0.025 | ≤0.025 | 0.5-0.8 | 0.8-1.1 | 0.17-0.37 | ≤0.25 | The rest | ≤0.2 | 0.1-0.2 | - | - | - |
Fe is the basis.
Mechanical characteristics
| Section, mm | t отпуска, °C | sT|s0,2, MPa | σB, MPa | d5, % | d4 | y, % | kJ/m2, кДж/м2 | Brinell hardness number, MPa | HRC |
|---|---|---|---|---|---|---|---|---|---|
| Forgings. Hardening + Vacation | |||||||||
| 100-300 | - | ≥685 | ≥835 | ≥12 | - | ≥38 | ≥480 | 262-311 | - |
| Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery | |||||||||
| 0.1-4 | - | - | 780-1180 | - | - | - | - | - | - |
| Rolled steel. Quenching in oil at 880 °C to + leave at 500 °C | |||||||||
| 20 | - | ≥1200 | ≥1320 | ≥12 | - | ≥42 | - | ≥385 | - |
| Rod 20-40 mm. (indicate the modes of heat treatment) | |||||||||
| - | - | ≥350 | ≥650 | ≥20 | - | - | - | - | - |
| Rolled steel. Quenching in oil from 850 °C + Vacation | |||||||||
| - | - | ≥1580 | ≥1940 | ≥1 | - | - | - | - | 52-54 |
| Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C | |||||||||
| - | - | ≥840 | ≥940 | ≥22 | - | ≥62 | - | - | - |
| Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery | |||||||||
| 0.1-4 | - | - | ≤880 | - | ≥8 | - | - | - | - |
| Rolled steel. Quenching in oil at 880 °C to + leave at 500 °C | |||||||||
| 40 | - | ≥1030 | ≥1180 | ≥15 | - | ≥47 | - | ≥350 | - |
| Rolled steel. Quenching in oil from 850 °C + Vacation | |||||||||
| - | 200 | ≥1760 | ≥2010 | ≥2 | - | - | - | - | 50-51 |
| Rod 20-40 mm. (indicate the modes of heat treatment) | |||||||||
| - | - | ≥420 | ≥710 | ≥16 | - | - | - | - | - |
| Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C | |||||||||
| - | - | ≥820 | ≥910 | ≥16 | - | ≥62 | - | - | - |
| Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery | |||||||||
| 0.1-4 | - | - | ≤740 | - | ≥10 | - | - | - | - |
| Rolled steel. Quenching in oil at 880 °C to + leave at 500 °C | |||||||||
| 60 | - | ≥860 | ≥1060 | ≥18 | - | ≥50 | - | ≥300 | - |
| Rolled steel. Quenching in oil from 850 °C + Vacation | |||||||||
| - | 300 | ≥1640 | ≥1690 | ≥2 | - | - | - | - | 48-49 |
| Rod 20-40 mm. (indicate the modes of heat treatment) | |||||||||
| - | - | ≥350 | ≥570 | ≥22 | - | - | - | - | - |
| Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C | |||||||||
| - | - | ≥750 | ≥830 | ≥20 | - | ≥59 | - | - | - |
| Rolled steel. Quenching in oil from 850 °C + Vacation | |||||||||
| - | 450 | - | ≥1580 | ≥4 | - | ≥36 | - | - | 45-47 |
| Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C | |||||||||
| - | - | ≥710 | ≥830 | ≥16 | - | ≥62 | - | - | - |
| Spring. Wrapped at 850-870 °C, quenching in oil from 850 °C + Vacation at 420-450 °C, air cooling | |||||||||
| ≤15 | - | ≥1270 | ≥1470 | ≥12 | - | - | - | - | 44-49 |
| Rolled steel. Quenching in oil from 850 °C + Vacation | |||||||||
| - | 500 | - | ≥1370 | ≥8 | - | ≥54 | - | - | 43-44 |
| Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C | |||||||||
| - | - | ≥420 | ≥500 | ≥26 | - | ≥74 | - | - | - |
| Bars and strip hot rolled and forged. Quenching in oil with 845-875 °C + Vacation at 450-500 °C, cooling in oil | |||||||||
| - | ≥1080 | ≥1270 | ≥10 | - | ≥45 | - | ≥363 | - | |
| Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C | |||||||||
| - | - | - | ≥380 | ≥30 | - | ≥87 | - | - | - |
| Bars and rods of steel treated in the ladle a synthetic slag in the delivery condition on the other 14-1-658-73. Samples of the cross | |||||||||
| - | - | - | ≥5 | - | ≥27 | - | - | - | |
| Rolled steel. Quenching in oil from 860 °C to + vacation at 480 °C. At 20 °C HRC=42-44 | |||||||||
| - | - | ≥1370 | ≥1470 | ≥10 | - | ≥42 | - | - | - |
| Rolled steel. Isothermal annealing (in a molten salt with a temperature of 320-330 °C) 870 °C to + leave at 330 °C, air cooling | |||||||||
| ≤20 | - | ≥1430 | ≥1570 | ≥6 | - | - | ≥589 | - | 44-50 |
| Rolled steel. Quenching in oil from 860 °C to + vacation at 480 °C. At 20 °C HRC=42-44 | |||||||||
| - | - | ≥1250 | ≥1410 | ≥9 | - | ≥40 | - | - | - |
| Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Quenching in oil from 850 °C + Vacation at 470 °C | |||||||||
| - | ≥1080 | ≥1270 | ≥8 | - | ≥35 | - | ≤269 | - | |
| Rolled steel. Quenching in oil from 860 °C to + vacation at 480 °C. At 20 °C HRC=42-44 | |||||||||
| - | - | ≥1200 | ≥1380 | ≥9 | - | ≥32 | - | - | - |
| - | - | ≥1180 | ≥1370 | ≥13 | - | ≥40 | - | - | - |
| - | - | ≥1060 | ≥1200 | ≥15 | - | ≥60 | - | - | - |
Description mechanical marks
| Name | Description |
|---|---|
| Section | Section |
| 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 |
| d4 | Elongation after rupture |
| y | The relative narrowing |
| kJ/m2 | Toughness |
| HRC | Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
| Temperature | Е, ГПа | G, ГПа | r, кг/м3 | l, Вт/(м · °С) | R, НОм · м | a, 10-6 1/°С | С, Дж/(кг · °С) |
|---|---|---|---|---|---|---|---|
| 0 | 218 | 85 | 7800 | 40 | 320 | - | - |
| 20 | 218 | - | 7800 | 40 | 320 | - | - |
| 100 | 215 | 83 | 7780 | 39 | - | 117 | 490 |
| 200 | 210 | 81 | 7750 | 38 | - | 122 | 505 |
| 300 | 200 | 79 | 7720 | 37 | - | 129 | 510 |
| 400 | 188 | 73 | 7680 | 36 | - | 135 | 530 |
| 500 | 178 | 70 | 7650 | 33 | - | 14 | 560 |
| 600 | 160 | 62 | 7610 | 31 | - | 144 | 520 |
| 700 | 142 | 54 | - | 29 | - | 146 | 620 |
| 800 | 132 | 50 | - | 28 | - | 146 | 620 |
| 1000 | - | - | - | - | - | 131 | 700 |
A description of the physical symbols
| Name | Description |
|---|---|
| Е | The normal elasticity modulus |
| G | Modulus of elasticity shear torsion |
| r | Density |
| l | Coefficient of thermal conductivity |
| R | UD. the resistivity |
| a | The coefficient of linear expansion |
Technological properties
| Name | The value |
|---|---|
| Weldability | Does not apply to welded structures. |
| Propensity to temper brittleness | Malosolone. |
| Forging temperature | Start - 1180 °C, the end - of 800 °C. the cooling of the workpiece cross-section up to 50 mm in the air, 51-180 mm in the wells. |
| Flock-sensitive sensitivity | not sensitive. |
| Workability by cutting | In hot-rolled condition with HB 269 and blower SB=900 MPa Kn TV.SPL.=0,70 Kn b.St.=0,35. |
