ASTM A269 / A249 TP316 / 31600 Stainless Steel Seamless / Welded Tube For Oil And Gas

ASTM A269 A249 TP316 1.4401 Stainless Steel Welded Tube 3SWG ISO Certified

MTSCO Beyond Just a Supplier

MTSCO’s jointly held manufacturing facility—HUXIN Pipe, draws upon 35 years of manufacturing heritage, specializing in the production of high-standard, precision-welded stainless steel tubing. We maintain direct connections with the supply chains of major steel producers such as Baosteel and Tisco to ensure the exceptional purity of our raw materials. As a fully ISO-certified supplier of specialized tubing, MTSCO is dedicated to providing global engineering firms with cost-effective fluid conveyance solutions. Do you have a project requiring urgent evaluation and cost estimation? Contact our experts immediately to receive a direct-from-factory quotation.

How Are Flawless Welded Tubes Made?

The exceptional reliability of our TP316 welded tubing stems from a rigorous, continuous in-line manufacturing process. After the raw steel coils undergo slitting and forming, they proceed to a fully automated welding station where simultaneous internal leveling is performed to completely eliminate any weld bead protrusion. Subsequently, the tubing immediately undergoes in-line Eddy Current Testing (ET) followed by in-line annealing to thoroughly relieve residual stresses. MTSCO maintains strict control over this automated, closed-loop core process, thereby guaranteeing a uniform and stable metallurgical structure that perfectly meets the exacting operational demands of high-pressure heat exchange equipment.

Key Specs at a Glance

Quality Control System

· Secondary Inspection of Raw Materials: We procure raw steel plates directly from leading steel mills—such as Baosteel, Tisco, and TSINGSHAN. Upon arrival at our facility, every batch of raw material undergoes a 100% PMI (Positive Material Identification) verification conducted by the MTSCO laboratory.

· Comprehensive Process Traceability: Throughout the entire production cycle of MTSCO welded tubes, we utilize a "Process Card" system to track every stage of manufacturing. At critical junctures, on-site QC personnel capture real-time photographs and upload them to our system, ensuring full product traceability from start to finish.

· 100% Non-Destructive Testing Prior to Shipment: Before shipment, every finished tube must undergo 100% hydrostatic testing and X-ray inspection. Additionally, we conduct rigorous dimensional and surface inspections to ensure that not even the slightest defect goes undetected.

Product Standards & Applicability

ASTM A249 and ASTM A269 are industry standards governing austenitic stainless steel tubing. ASTM A249 focuses on high-pressure applications—such as heat exchangers and boilers—while ASTM A269 is dedicated to general corrosion-resistant fluid conveyance, particularly for industrial instrumentation. The TP316 welded tubing supplied by MTSCO complies with both of these dual standards; meeting all specified testing criteria, it perfectly satisfies the rigorous safety and compliance requirements of high-standard heat exchange systems worldwide.

FAQ

Q1: Why must 316-grade welded tubing undergo Online Solution Annealing after automated welding?

A1: The thermal cycles associated with welding can lead to the localized accumulation of residual stress. MTSCO utilizes fully automated online annealing furnaces to perform rapid, high-temperature heating, thereby completely eliminating residual stress and restoring the material's toughness. This process ensures a uniform and stable metallurgical structure, significantly enhancing the product's overall corrosion resistance and service life.

Q2: What international certifications do your products hold?

A2: Our products are certified under the ISO 9001 Quality Management System and hold additional certifications including PED, M650, and AD2000.

Q3: Can third-party inspections be arranged?

A3: Absolutely. We fully support on-site inspections conducted by authoritative third-party agencies—such as SGS, TUV, and BV—prior to shipment. Our QC team actively cooperates to ensure a smooth inspection process, providing you with complete peace of mind regarding the quality of your delivery.