Fig. 1.
![Ceramic roof tile extrusion process – A) schematic diagram of construction of extruder barrels: 1 - vacuum zone, 2 - screw, 3 - pressure head, 4 - forming tool [25], B) main view of extruder, C) process of band forming](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/6472537e215d2f6c89dc426b/j_msp-2023-0011_fig_001.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=ASIA6AP2G7AKHXHJMV5O%2F20260218%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20260218T215743Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKH%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDGV1LWNlbnRyYWwtMSJGMEQCICWNiexsh2x7d3z9Q9NQcpOFPu90LL%2BOosaiO2lptWx5AiBh7HzUqzbaPoweXO13bsA1RzaAxeNCgk9iV%2F%2BAbgx4Gyq9BQhqEAIaDDk2MzEzNDI4OTk0MCIMElMrfGk6F%2B7tSSDGKpoFdFwYf6AI4A6j8xGQHJ8Fmps53H4QUJvImiEYaceDpXWO6hR4ODaj9wqdR5O8Zs32KHZBmT1%2BCpeFGujxvU%2FjLpOjOD5ThimVYwCBqvdDt1Of02ySJhOTmESr9yqbFQih7hOwAknFmuXtOdUZqFpACp5C59j24kWT3CHZRxfRUpOhBvRe4EsZATpymL1quktPQtQqeCXDlh5aeGJuCAEf68NqBfSF2mHjf9RT5nd5E0%2FoFvBFR%2BQ%2FqHyGPfSmyeWkLjg2CudBtjWr6Lu9gZ6mYqo6Dp6LpQRffXcLf7R5yPOk7lb85vZyfito2G9i8ibLUSFgh7ThGN9MXr1dGws9L0NrTIMDbrfS8QE9UsEQ1%2B%2BiS24BqOM8S5xhmZzy0yFzrn4YLzaIsxzYuHMBZrG4wNrp2YhfpCZvl%2F3UwxXimaK8wYGBXwqCTlJNZzOkn%2BfTlONHAZzMWQz7u7kAlsxitkytSggk2Hp7w8JMCaqVBicH5LWZywIGJPb3OWMBlfR3I08VBXH3k4lbFD3R372LDO%2BY28jzkPjaSfBIrq91zxYUZCRYuq29ni5w7RB%2FA4mP%2BRYEtPJRwdSozISiJX5IpgrLYkiRDr%2F4Lri3WDGcgwMevNx%2FqsA6bprAeVgw9RI7Pf0%2FZFHIhlidhD9CAs7hu7Q3%2FAG6oVUGXZ%2FkE2%2Bty1XNL8sWoMAXk1B2Q7viPLXu8hb8qmmAp3k9y8nINhORbyf%2FZEosrZlrciSlTlCprf%2FnIL5WCApzVy8rZo2a6jTDJLeeUd1xdMv8bfCQZv06Rlj0M%2BmKdnUJOnCA6OerCsgfxiWHaTGLtMHEa%2F0LITYVjrZc2oQJtq9fmsYrMuSZBS8cvEvxaoKwXCvgZubDLTXZ%2FrPMX60otGTMMObb18wGOrIBeL6GP88gl0YoswWbbETpX0A7WlU6OtA0sLGkOA1ohRyAXgqkp2xvfRTsRv6u%2Fitr%2Bk6y9bC3pnaod2ZzHZlxE8dLKoJbLoF3iEs2nH5VXbSvjUtoQwXuEZhKdZtLsJge0MiWyx7ZUwAs9x1Wzh%2BCuyjudbDY5Wb1E9z5VbLf73L4FXwDgqJVvc3ZlFfCCFz8NOO8QtNl9Ab%2BeWSx4%2FTvYHz6Ym3rOkIjXnT3NEBIGW51Aw%3D%3D&X-Amz-Signature=108b29ca2723d4e5da34c5104fb376c2659bef093e18814ba2ccd60a106fad3e&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)
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Results of the measurement of the track volume in the ball-on-disc test
| Parameters | Sample 960/450 | Sample 1060/450 | Sample 1020/200 |
|---|---|---|---|
| Track volume | 9622503 | 20987030 | 3397096 |
| Max. track depth | 17.0 | 21.7 | 7.46 |
Parameters of the test samples’ heat treatment
| Sample no. | Austenitizing temperature [°C] | Tempering temperature [°C] | Tempering time [h] |
|---|---|---|---|
| 960/450 | 960 | 450 | 2 |
| 1060/450 | 1060 | 450 | 2 |
| 1020/200 | 1020 | 200 | 2 |
Chemical composition of X153CrMoV12 steel
| Steel X153CrMoV12 (NC11LV) – chemical composition [%] | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Cr | Mo | Ni | Al | Cu | V | W |
| 1.59 | 0.25 | 0.38 | 0.012 | 0.008 | 11.72 | 0.88 | 0.20 | 0.03 | 0.06 | 0.76 | 0.05 |
Results of the impact energy of samples with a V-notch
| Material | Sample no. | Test temperature | Energy |
|---|---|---|---|
| °C | J | ||
| NC11LV | 960/450 | 50 | 3.8 |
| 1060/450 | 50 | 3.7 | |
| 1020/200 | 50 | 2.8 | |
| 960/450 | 200 | 4.9 | |
| 1060/450 | 200 | 4.6 | |
| 1020/200 | 200 | 3.1 | |
| Hardox 600 | 1 | 50 | 21.6 |
| 2 | 200 | 24.3 |