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Precision steel tube
Boiler tube
STKM 11A, STKM12ABC,STKM13ABC,STKM 14ABC
SCM 415 ,SCM 420 ,SCM 440
St35,St45,St52
E215, E235, E355
1010,1015,1020,4140,5120
10,20, 35,45,10G2, 20Ch,15ChM
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