| Grade : | 50KHFА ( 50ХФА ) |
| Substitute: | 60С2А, 50ХГФА, 9ХС |
| Classification : | Spring structural steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 50KHFА ( 50ХФА )
| C | Si | Mn | Ni | S | P | Cr | V | Cu |
| 0.46 - 0.54 | 0.17 - 0.37 | 0.5 - 0.8 | max 0.25 | max 0.025 | max 0.025 | 0.8 - 1.1 | 0.1 - 0.2 | max 0.2 |
Temperature of critical points for grade 50KHFА ( 50ХФА ).
| Ac1 = 752 , Ac3(Acm) = 788 , Ar3(Arcm) = 746 , Ar1 = 688 , Mn = 300 |
Mechanical properties under Т=20oС for grade 50KHFА ( 50ХФА )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar | 1300 | 1100 | 10 | 45 | Guenching and drawing | |||
| Rolled stock, GOST 14959-79 | 1270 | 1080 | 8 | 35 | Guenching and drawing | |||
| Band annealed , GOST 2283-79 | 0.1 - 4 | 880 | 8 | |||||
| Band cold-worked , GOST 2283-79 | 0.1 - 4 | 780-1180 |
| Brinell hardness for 50KHFА ( 50ХФА ) (without heat treatment) , Rolled stock GOST 14959-79 | HB 10 -1 = 302 MPa |
| Brinell hardness for 50KHFА ( 50ХФА ) (heat treatment) , Rolled stock GOST 14959-79 | HB 10 -1 = 269 MPa |
Technological properties for grade 50KHFА ( 50ХФА )
| Weldability: | is not used. |
| Flakes : | not predisposed |
| Temper brittleness: | weakly predisposed |
Physical properties for grade 50KHFА ( 50ХФА )
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
| Grade | MPa | 1/Grade | Watt/(m·Grade) | kg/m3 | J/(kg·Grade) | Ohm·m |
| 20 | 2.18 | 40 | 7800 | 320 | ||
| 100 | 2.15 | 11.7 | 39 | 7780 | 490 | |
| 200 | 2.1 | 12.2 | 38 | 7750 | 505 | |
| 300 | 2 | 12.9 | 37 | 7720 | 510 | |
| 400 | 1.88 | 13.5 | 36 | 7680 | 530 | |
| 500 | 1.78 | 14 | 33 | 7650 | 560 | |
| 600 | 1.6 | 14.4 | 31 | 7610 | 580 | |
| 700 | 1.42 | 14.6 | 29 | 620 | ||
| 800 | 1.32 | 13.1 | 28 | 700 | ||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 50KHFА ( 50ХФА )
| USA | Germany | Japan | France | England | European | Italy | Belgium | Spain | China | Sweden | Bulgaria | Hungary | Poland | Romania | Czechia | Australia | South Korea | |||||||||||||||||||||||||||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | NBN | UNE | GB | SS | BDS | MSZ | PN | STAS | CSN | AS | KS | |||||||||||||||||||||||||||||||||||||||||||||
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Types of delivery of grade 50KHFА ( 50ХФА )
| B03 - Metal forming treatment. Forgings |
| В05 - Welding and cutting of metals., Soldering, riveting |
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
| B34 - Ribbons |
| В72 - Medium-high and high-carbon steel wire |
Specification :
| Mechanical properties : | |
| sв | - Tensile strength , [MPa] |
| sT | - Yield stress, [MPa] |
| d5 | - Specific elongation at fracture , [ % ] |
| y | - Reduction of area , [ % ] |
| KCU | - Impact strength , [ kJ / m2] |
| HB | - Brinell hardness , [MPa] |
Physical properties : | |
| T | - Test temperature , [Grade] |
| E | - Young modulus , [MPa] |
| a | - Coefficient of linear expansion (range 20o - T ) , [1/Grade] |
| l | - Termal (heat) condition coefficient , [Watt/(m·Grade)] |
| r | - Density , [kg/m3] |
| C | - Specific heat ( range 20o - T ), [J/(kg·Grade)] |
| R | - Electrical resistance , [Ohm·m] |
Weldability : | |
| without limitations | - welding is done without heating and subsequent heat treeting |
| limited weldability | - welding is possible under heating up to 100-120 grade and subsequent heat treeting |
| hard weldability | - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing |
50KHFА ( 50ХФА ) - Spring structural steel: chemical composition, mechanical and physical properties, hardness
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