 
Gb 5310 20mng seamless boiler tubes, compliant with gb/t 5310-2017, are high-strength carbon steel t...
 
Gb 5310 25mng seamless boiler tubes, compliant with gb/t 5310-2017, are high-strength carbon steel t...
 
Gb 5310 12cr2mog seamless boiler tubes, compliant with gb/t 5310-2017, are pearlitic alloy steel tub...
 
Gb 5310 10cr9mo1vnbn seamless boiler tubes, compliant with gb/t 5310-2017, are low-alloy steel tubes...
 
Gb 5310 12cr2mowvtib seamless boiler tubes, compliant with gb/t 5310-2017, are bainite heat-resistan...