| Grade : | 7KH3 ( 7Х3 ) |
| Substitute: | 8Х3 |
| Classification : | Die tool steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 7KH3 ( 7Х3 )
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Ti | Cu |
| 0.65 - 0.75 | 0.1 - 0.4 | 0.15 - 0.45 | max 0.4 | max 0.03 | max 0.03 | 3.2 - 3.8 | max 0.2 | max 0.2 | max 0.15 | max 0.03 | max 0.3 |
Temperature of critical points for grade 7KH3 ( 7Х3 ).
| Ac1 = 770 , Ac3(Acm) = 730 , Mn = 400 |
Mechanical properties under Т=20oС for grade 7KH3 ( 7Х3 )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| 1320 | 1240 | 10 | 36 | 370 | Guenching 870oC, oil, Drawing 500oC, 2h, |
| Brinell hardness for 7KH3 ( 7Х3 ) (annealing) , GOST 5950-2000 | HB 10 -1 = 229 MPa |
Technological properties for grade 7KH3 ( 7Х3 )
| Weldability: | is not used. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Equivalent steels for grade 7KH3 ( 7Х3 )
| Germany | ||||
| DIN,WNr | ||||
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Types of delivery of grade 7KH3 ( 7Х3 )
| В22 - Graded and shaped rolling |
| B31 - Blanks, Blanks, Slabs |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
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 |
7KH3 ( 7Х3 ) - Die tool steel: chemical composition, mechanical and physical properties, hardness
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