[MW:21670] Bend test was broken on A312 TP 321

Hi All

 when we carryout PQR for material A 312 TP 321 welding to  A312 TP 321 (pipe 8'' SCH 120)

1. Welding Process GTAW+SMAW

2.Welding consumable ER347+E347-16

3.Interpass max 175 oC

4.pwht :900 Celsius at 8 hours 

5. Code applied ASME 

problems: 2 side Bend test were broken 

Can some body know or  have experience  above problem 

Tuan 

QA/QC posco

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