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1 1/2" ASTM A53 electricity weld overlay well-knit 12crmov steel pipes high pressure boiler tube
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30CrMo GB/T8162 GB/T3077hot rolled carbon and alloy steel Tube for High-Pressure Vessel t11 alloy seamless steel tube
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30CrMo GB/T8162 GB/T3077hot rolled carbon&alloy steel seamless steel pipe for Tube for High-Pressure Vessel