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).