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Professional Mechanical Polishing Tubes Seamless Stainless Steel Pipe for Gas Pipeline. Wide Material Range: Available in 304, 316L, 2205, 2507, and other stainless steel grades. Customizable Dimensions: Length adjustable from 1000mm to 12000mm; Outer diameter 21.3mm-1016mm. Comprehensive Certifications: Certified by CCS, ABS, GOST, Lr, Gl, BV, Dnv, Kr, Rina, and Nkk. OEM and ODM Services: Full customization available from samples or designs with dedicated engineers. Fast Delivery: Delivery within 5-30 days after receiving prepaid payment. Strict Quality Control: 100% inspection including visual, function, ultrasonic, and water pressure tests. 2-Year Warranty: Comprehensive 2-year warranty coverage for mechanical defects.