G3T+group3

This is the space of group 3 from class G3T. Our group members are Sabine**,** Ayed**,** Bart, Joris, Joachim and Michelle**.

**

In a horizontal section with a length of 6 metres, liquid steel flows at a speed of 0.1 m/s. The height from surface to bottom is 0.78 cm. 1. How long does it take for the steel to pass the section? 2. What is the minimum rising velocity for an inclusion entering at the bottom required to reach the surface within the section?
 * The answers of Chapter 3:**
 * Answer:** Time = 6 divided by 0.1 is 60 seconds.
 * __Hello Sabine, Michelle, Ayed, Bart, Joris and Joachim; The 0.78 cm in this calculation must be 0.78 m!__**
 * __Sorry for the mistake in your booklet. Greetings, Mrs. Terpstra.__**
 * Answer:** Minimum rising velocity = 78 divided by 60 = 1.3 cm/s

3. For which particle size given in the table, all particles will reach the surface within the section?
 * Answer:** Particles bigger than 0.2 mm will all reach the surface.

Casting 2 strands of 225 mm thick and 1300 mm wide at 1.5 m/ min 4. How many tonnes of slabs are produced per minute?
 * Answer:** Tonnage per minute: 2 * 0.225 * 1.3 * 1.5 * 7.0 = 6.1425 ton/min.

5. How many tonnes a year can be produced when operating 90 % of the year?
 * Answer:** In a year: 6.1425 * 60 * 24 * 365 *0.9 = 2.9 Mton.

6. Why is casting so critical for the cleanliness of the steel?
 * Answer:** The inclusions are a lot weaker than steel and thus weaken the steel. Casting removes these inclusions and so cleans the steel.

7. Which inclusion is worse: an inclusion that keeps his form during rolling or a particle that is rolled out like steel?
 * Answer:** The second one, because it occupies a larger surface.

8. What is the length of the hot rolled coil?
 * Answer**: 10.584 metres. ( HR-length = 10.8 x 225:2.5 x 0.98 = 952.56 m)

9. How long is the cold rolled coil?
 * Answer:** 10824.5 metres. ( CR-length 952.56 x 2.5 : 0.22 = 10824.5 m)

10. What is the maximum inclusion size that is allowed in the material? Maximum inclusion size 0.073333 : 3 = 0.02444 = 24 μm)
 * Answer:** 0.02444 millimetres ( Wall thickness = 0.22 : 3 = 0.07333
 * glossary of chapter 3 (difficult words)**



I hope our information has helped you. See ya!

Group 3, G3T