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Introduction
Offer big-diameter& thick-wall spiral pipe standards: SY/T5037 -2000 API,BV,SGS,ISO Certification Material: Q235A Q23Bseamless stee pipe1 Gage;from 1/2"--49"Material: Q235B ,Q345B 20# 10# ,ST37 ST523.Standard: GB/T8162-1999,GB/T8163-1999 2 Grade : A106B A53B J554 pass the API certification5 have a good aftet sales service6 have a perfect quality control [Details]
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