U7A, C70W1, C70W2, 1.1520, 1.1620 - tool steel
Carbon tool steel U7A/U7, C70U, C70W1, C70W2, 1.1520, 1.1620 according to PN-H-85020, DIN 17350, ISO 4957.
| Standard | Steel Grade | |||||||
|---|---|---|---|---|---|---|---|---|
| Chemical composition % | ||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Cu: | |
| PN | N7E | |||||||
| 0.65 - 0.74 | 0.15 - 0.30 | 0.15 - 0.30 | <0.025 | <0.025 | <0.15 | <0.20 | <0.20 | |
| PN | N7 | |||||||
| 0.65 - 0.74 | 0.15 - 0.35 | 0.15 - 0.35 | <0.030 | <0.030 | <0.20 | <0.25 | <0.25 | |
| GOST | U7A - У7А | |||||||
| 0.65 - 0.74 | 0.17 - 0.28 | 0.17 - 0.33 | <0.025 | <0.018 | <0.20 | <0.25 | <0.25 | |
| GOST | U7 - У7 | |||||||
| 0.66 - 0.73 | 0.20 - 0.40 | 0.15 - 0.35 | <0.030 | <0.028 | <0.20 | <0.25 | <0.25 | |
| ISO | C70W1 - C70U - 1.1520 | |||||||
| 0.65 - 0.75 | 0.10 - 0.40 | 0.10 - 0.30 | <0.030 | <0.030 | - | - | - | |
| DIN | C70W2 - 1.1620 | |||||||
| 0.65 - 0.74 | 0.10 - 0.35 | 0.10 - 0.30 | <0.030 | <0.030 | - | - | - | |
C70U, U7A, C70W1, C70W2 - specification and application
Deep and shallow hardening carbon steel with the lowest carbon content of N12E carbon materials. It exhibits high impact strength, shock resistance, and relatively high hardness. If we talk about its drawbacks, it is characterized by low abrasion resistance and low machinability. N7E is used for the production of tools for woodworking, soft stones, cutting boards, small die-cutting dies for hot work, smithery hammers. In some cases it can be used as a substitute for spring steels
Mechanical properties of U7A, C70W1, C70W2
- Softened condition - hardness <187 HB
- Hardened condition - hardness >57 HRC
Heat treatment - processes and temperatures:
- Softening annealing at a temperature of 680 - 710 C
- Relief annealing at a temperature of 600 - 700 C
- Hardening at a temperature of 780 - 820 C
- Tempering at a temperature of 170 - 190 C
In the above mentioned grades the company delivers:
Substitutes, equivalents and other species designations
N7
N7E
C70KU
C70W1
1.1520
C70W2
1.1620
U7
U7A
bars C67S
TC70
S71
S72
SK7
SK65
C70E2U
У7
У7А
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