Steel 50KHFA (50ХФ)
Designation
Name | The value |
---|---|
Name | The value |
Designation GOST Cyrillic | 50ХФА |
Designation GOST Latin | 50XFA |
Transliteration | 50HFA |
By chemical elements | 50CrV |
Name | The value |
---|---|
Name | The value |
Designation GOST Cyrillic | 50ХФ |
Designation GOST Latin | 50XF |
Transliteration | 50HF |
By 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 |
---|---|---|
Name | Code | Standards |
Sheets and strips | В23 | GOST 103-2006 |
Bars and shapes | В22 | GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
Tape | 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 strips | В33 | GOST 4405-75, TU 14-1-3196-81, TU 14-1-3396-82 |
Bars and shapes | 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 |
Processing of metals by pressure. Forgings | В03 | GOST 8479-70, ST ЦКБА 010-2004 |
Blanks. Of the workpiece. Slabs | В31 | TU 14-1-1213-75, TU 1-92-156-90 |
Steel pipes and fittings to them | В62 | TU 14-3-356-75 |
Wire, steel, alloy | В73 | TU 14-4-70-72 |
Chemical composition
Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | V | Ti | Mo | W |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | 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 | Rest | ≤0.2 | 0.1-0.2 | - | - | - |
Fe is the basis.
Mechanical properties
Section, mm | t отпуска, °C | sT|s0,2, MPa | σU, MPa | d5, % | d4 | y, % | KCU, kJ/m2 | HB, MPa | HRC |
---|---|---|---|---|---|---|---|---|---|
Section, mm | t отпуска, °C | sT|s0,2, MPa | σU, MPa | d5, % | d4 | y, % | KCU, kJ/m2 | HB, 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 |
---|---|
Name | Description |
sT|s0,2 | Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
σU | Limit short-term strength |
d5 | Elongation after rupture |
d4 | Elongation after rupture |
y | The relative narrowing |
KCU | Toughness |
HB | Brinell hardness number |
HRC | Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
Temperature | Е, HPa | G, HPa | r, kg/m3 | l, W/(m · °C) | R, Mr. · m | a, 10-6 1/°C | С, J/(kg · °C) |
---|---|---|---|---|---|---|---|
Temperature | Е, HPa | G, HPa | r, kg/m3 | l, W/(m · °C) | R, Mr. · m | a, 10-6 1/°C | С, J/(kg · °C) |
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 |
---|---|
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 |
---|---|
Name | The value |
Weldability | Does not apply to welded structures. |
Склонность к отпускной хрупкости | Malosolone. |
The temperature of forging | 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. |
Machinability | In hot-rolled condition with HB 269 and blower SB=900 MPa Kn TV.SPL.=0,70 Kn b.St.=0,35. |