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astm a106/ a53 gr.b black seamless steel pipe carbon steel seamless pipe
8YRSTianjin Youfa International Trade Co Ltd
8YRSTianjin Youfa International Trade Co Ltd
SHENSHI Spiral Tube Exchanger Anti-Corrosion shell and pipe heat exchanger Ω tube Chemical Plants
10YRSHangzhou Shenshi Energy Conservation Technology Co., Ltd.
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