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:

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.

Second. What are the definitions of the delivery conditions 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.

Oiling: Apply anti-rust oil to the outer surface to prevent corrosion during transportation and storage.

3) 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?

1) Non-destructive Testing: Ultrasonic testing (UT) is performed according to GB/T 5777 to ensure no delamination, cracks, or other defects.

2) Hydrostatic Test: The test pressure is usually 1.5 times the nominal pressure, maintained for 10 seconds without leakage.

3) 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?

1) Standard update: GB/T 5310 has been updated to the 2017 version; the requirements of the new version need to be confirmed.

2) Special requirements: If fixed length, threading, etc., are required, they must be specified in the contract.

3) Alternative materials: If an internationally equivalent grade is required, ASME SA-335 P11 (similar chemical composition) can be compared.