What is the delivery condition of 12Cr1MoVG high-pressure alloy steel pipe

What is the delivery condition of 12Cr1MoVG high-pressure alloy steel pipe The following is a summary of key information regarding the delivery condition of 12Cr1MoVG high-pressure alloy steel pipe: 1. What is the standard for 12Cr1MoVG high-pressure alloy steel pipe? GB/T 5310-2017 “Seamless Steel Tubes for High-Pressure Boilers”: This standard clearly specifies the delivery condition, technical requirements, and inspection rules for 12Cr1MoVG steel pipe. 2. What is the definition of the delivery condition of 12Cr1MoVG high-pressure alloy steel pipe? 12Cr1MoVG steel pipe is usually delivered in the normalized + tempered (quenched and tempered) condition. Specific requirements are as follows: 1) Heat treatment process: Normalizing: Heating to 900~950℃, holding, and then air cooling to refine the grain size. Tempering: Heating to 700~750℃, holding, and then air cooling to eliminate internal stress and improve toughness. 2) Surface condition: Pickling: Pickling the inner wall to remove oxide scale and ensure cleanliness. 3) Oiling: Apply anti-rust oil to the outer surface to prevent corrosion during transportation and storage. 4) Pipe End Treatment: Machining to remove burrs from the ends for easy welding or connection. 3. What are the mechanical properties of 12Cr1MoVG high-pressure alloy steel pipe? Tensile Strength (UTS): ≥520 MPa Yield Strength (YS): ≥310 MPa Elongation (EL): ≥22% Impact Toughness (KV₂): ≥47 J (20℃) 4. What are the inspection requirements for 12Cr1MoVG high-pressure alloy steel pipe? Non-destructive Testing: Ultrasonic testing (UT) is performed according to GB/T 5777 to ensure no delamination, cracks, or other defects. Hydraulic Pressure Test: The test pressure is usually 1.5 times the nominal pressure, maintained for 10 seconds without leakage. Dimensional Tolerances: Outer diameter (OD) and wall thickness (WT) must conform to GB/T 17395 or as agreed upon by the supplier and the buyer. 5. What are the application scenarios for 12Cr1MoVG high-pressure alloy steel pipes? Supercritical/subcritical boiler water-cooled walls, high-temperature steam pipelines, heat exchanger tube bundles (design temperature ≤580℃) 6. What are the precautions for 12Cr1MoVG high-pressure alloy steel pipes? Standard Update: GB/T 5310 has been updated to the 2017 version; the requirements of the new version need to be confirmed. Special Requirements: If fixed lengths, threading, etc., are required, they must be specified in the contract. Alternative Materials: If an internationally equivalent grade is required, compare with ASME SA-335 P11 (similar chemical composition). Post time: Jan-16-2026