135569
Materials
- Jul 20, 2015
- 1
thread330-191256
Hi. Thankful for read my E-mail. Please guide me for my problem. We are producing ring tire for railway with hot forging according UIC 810-01 Standard with grade B2 ( material number: 1.1203). our process has four stages.
1) Initial shaft billet stock with size 40cm diameter and 40cm height, upsetting to 17cm height and 67cm diameter at 1200 centigrade temperature.
2) Then it is piercing in center of shaft axis and remove a shaft with size 20cm in diameter form pivot such as shaft convert to thick ring and it cooling to ambient temperature.
3)Then it reheating and perform hot rolling to obtain final dimensions at 1200 centigrade temperature with %54 reduction.
4) Finally it normalizing at 880 centigrade temperature.
We have a customer that stated on order "minimum reduction must be 4 to 1 from billet stock to final product" and he believe that "cooling after upsetting to ambient temperature is not permit and microstructure of work piece (after heat treatment) affected by reheating between stage 2 and 3?" please write for me, if it has technical justification and either your answer to be Yes or No please guide me how do I prove it mathematically or according which standard?
Hi. Thankful for read my E-mail. Please guide me for my problem. We are producing ring tire for railway with hot forging according UIC 810-01 Standard with grade B2 ( material number: 1.1203). our process has four stages.
1) Initial shaft billet stock with size 40cm diameter and 40cm height, upsetting to 17cm height and 67cm diameter at 1200 centigrade temperature.
2) Then it is piercing in center of shaft axis and remove a shaft with size 20cm in diameter form pivot such as shaft convert to thick ring and it cooling to ambient temperature.
3)Then it reheating and perform hot rolling to obtain final dimensions at 1200 centigrade temperature with %54 reduction.
4) Finally it normalizing at 880 centigrade temperature.
We have a customer that stated on order "minimum reduction must be 4 to 1 from billet stock to final product" and he believe that "cooling after upsetting to ambient temperature is not permit and microstructure of work piece (after heat treatment) affected by reheating between stage 2 and 3?" please write for me, if it has technical justification and either your answer to be Yes or No please guide me how do I prove it mathematically or according which standard?
