GB 6479 Alloy Seamless Steel Pipe For High Pressure Fertilizer Equipment

Instruction

GB 6479 Alloy Seamless Steel Pipe For High Pressure Fertilizer Equipment

 

Material and Specification
GB 6479 is a Chinese national standard for alloy seamless steel pipes designed for high-pressure fertilizer equipment. The standard specifies the requirements for seamless steel pipes made from various grades of steel, ensuring their suitability for use in high-pressure applications. These pipes are primarily utilized in the fertilizer industry, where robust and reliable equipment is necessary for handling high-pressure fluids.

 

Chemical Composition
The chemical composition of the GB 6479 alloy seamless steel pipe varies depending on the specific steel grade used in its manufacturing. Below is a table presenting the typical chemical composition of these pipes for some common steel grades:

Steel Grade	Chemical Composition
Grade 20	C: 0.17-0.24%, Si: 0.17-0.37%, Mn: 0.35-0.65%, P: 0.035% max, S: 0.035% max
Grade 16Mn	C: 0.13-0.19%, Si: 0.20-0.60%, Mn: 1.20-1.60%, P: 0.030% max, S: 0.030% max
Grade 12CrMo	C: 0.08-0.15%, Si: 0.17-0.37%, Mn: 0.40-0.70%, P: 0.030% max, S: 0.030% max, Cr: 0.90-1.20%, Mo: 0.15-0.30%
Grade 15CrMo	C: 0.12-0.18%, Si: 0.17-0.37%, Mn: 0.40-0.70%, P: 0.030% max, S: 0.030% max, Cr: 0.80-1.10%, Mo: 0.40-0.55%

 

Mechanical Properties
The mechanical properties of GB 6479 alloy seamless steel pipes are crucial to ensure their performance and reliability under high-pressure conditions. The following table outlines the typical mechanical properties of these pipes for various steel grades:

Steel Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
Grade 20	410-550	≥245	≥25
Grade 16Mn	490-640	≥315	≥21
Grade 12CrMo	440-640	≥235	≥21
Grade 15CrMo	440-640	≥235	≥21

 

Steel Grade and Application

The GB 6479 standard covers several steel grades, each designed to meet specific application requirements in high-pressure fertilizer equipment. Here are some of the commonly used steel grades and their respective applications:

Grade 20: This grade of steel is commonly used for manufacturing seamless pipes in general high-pressure applications in the fertilizer industry.

Grade 16Mn: The Grade 16Mn steel exhibits excellent weldability and is suitable for high-pressure equipment subjected to bending, flanging, and other forming operations.

Grade 12CrMo: With added chromium and molybdenum, this grade offers enhanced corrosion resistance and high-temperature strength, making it ideal for applications in elevated temperatures.

Grade 15CrMo: Similar to Grade 12CrMo, Grade 15CrMo also provides excellent high-temperature strength and corrosion resistance, making it suitable for demanding high-pressure conditions.