| Grade : | U8 ( У8 ) |
| Substitute: | У7, У10 |
| Classification : | Carbon tool steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade U8 ( У8 )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.75 - 0.84 | 0.17 - 0.33 | 0.17 - 0.33 | max 0.25 | max 0.028 | max 0.03 | max 0.2 | max 0.25 |
Temperature of critical points for grade U8 ( У8 ).
| Ac1 = 720 , Ar1 = 700 , Mn = 245 |
Mechanical properties under Т=20oС for grade U8 ( У8 )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Blank | 6 | 1420 | 1230 | 10 | 37 | Guenching 780oC, oil, Drawing 400oC, | ||
| Band annealed | 1.5 | 750 | 10 |
| Brinell hardness for U8 ( У8 ) (annealing) , GOST 1435-99 | HB 10 -1 = 187 MPa |
Technological properties for grade U8 ( У8 )
| Weldability: | is not used. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade U8 ( У8 )
| 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 | 2.09 | 7839 | ||||
| 100 | 2.05 | 11.4 | 49 | 7817 | 477 | 230 |
| 200 | 1.99 | 12.2 | 46 | 7786 | 511 | 305 |
| 300 | 1.92 | 13 | 42 | 7752 | 528 | 395 |
| 400 | 1.85 | 13.7 | 38 | 7714 | 548 | 491 |
| 500 | 1.75 | 14.3 | 35 | 7676 | 565 | 625 |
| 600 | 1.66 | 14.8 | 33 | 7638 | 594 | 769 |
| 700 | 15.2 | 30 | 7600 | 624 | 931 | |
| 800 | 14.5 | 24 | 7852 | 724 | 1129 | |
| 900 | 1165 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade U8 ( У8 )
| USA | Germany | Japan | France | England | European | Italy | China | Poland | Czechia | Austria | ||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | GB | PN | CSN | ONORM | ||||||||||||||||||||
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Types of delivery of grade U8 ( У8 )
| 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 |
U8 ( У8 ) - Carbon tool steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys
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