High-pressure Fertilizer Pipes

High-pressure fertilizer pipes are specialized seamless steel pipes designed for use in chemical equipment and pipelines within the fertilizer industry. These pipes are typically made from high-quality carbon steel or alloy steel and are capable of withstanding high temperatures (up to 400°C) and pressures (up to 32 MPa). They are used to transport high-temperature and high-pressure fluids such as synthetic ammonia, urea, and methanol. The standard for these pipes is usually GB6479, with common materials including 20#, 16Mn, 12CrMo, and 12Cr2Mo.

• GB/T 6479: "Seamless steel pipes for high-pressure fertilizer equipment", applicable to seamless steel pipes for high-pressure fertilizer equipment such as synthetic ammonia and urea.

• GB/T 14976: "Stainless steel seamless steel pipes for fluid transportation", applicable to stainless steel pipes for corrosive medium transportation.

• ASTM A312: "Standard specification for austenitic stainless steel seamless steel pipes, welded steel pipes and deep cold processed steel pipes", applicable to high temperature and corrosive environments.

• ASTM A335: "Standard specification for ferritic alloy steel seamless steel pipes for high temperature", applicable to high temperature and high pressure environments.

• DIN 17175: "Heat-resistant steel seamless steel pipes", applicable to high temperature and high pressure equipment.

• JIS G3458: "Alloy steel pipes for piping", applicable to high-pressure fertilizer equipment.

1. Low alloy steel

15CrMo:

• Chemical composition: C: 0.12-0.18, Cr: 0.80-1.10, Mo: 0.40-0.55, Si: 0.17-0.37, Mn: 0.40-0.70

• Features: Good heat resistance and strength, suitable for synthetic ammonia equipment.

• 12Cr1MoV:

• Chemical composition: C: 0.08-0.15, Cr: 0.90-1.20, Mo: 0.25-0.35, V: 0.15-0.30, Si: 0.17-0.37, Mn: 0.40-0.70

• Features: High temperature strength and good thermal fatigue resistance.

2. Stainless steel

304/304L:

• Chemical composition: C: ≤0.08 (304) / ≤0.03 (304L), Cr: 18.0-20.0, Ni: 8.0-11.0, Mn: ≤2.0, Si: ≤1.0

• Features: Good corrosion resistance and processing performance, suitable for urea equipment.

316/316L:

• Chemical composition: C: ≤0.08 (316) / ≤0.03 (316L), Cr: 16.0-18.0, Ni: 10.0-14.0, Mo: 2.0-3.0, Mn: ≤2.0, Si: ≤1.0

• Features: Excellent corrosion resistance, especially resistance to chloride corrosion.

3. Duplex stainless steel

2205 (S31803):

• Chemical composition: C: ≤0.03, Cr: 22.0-23.0, Ni: 4.5-6.5, Mo: 3.0-3.5, N: 0.14-0.20, Mn: ≤2.0

• Features: high strength, excellent corrosion resistance and stress corrosion cracking resistance.

4. Other alloy steels

10MoWVNb:

• Chemical composition: C: 0.07-0.13, Mo: 0.50-0.70, W: 0.50-0.70, V: 0.20-0.40, Nb: 0.06-0.10, Si: 0.17-0.37, Mn: 0.40-0.70

• Features: high temperature resistance, corrosion resistance, suitable for synthetic ammonia equipment.

• Synthetic ammonia equipment: Used in synthetic ammonia reactors, heat exchangers and high-pressure pipelines.

• Urea equipment: Used in urea synthesis towers, high-pressure condensers and transportation pipelines.

• Heat exchangers: Heat exchange equipment used in fertilizer production.

• High-pressure pipelines: Used to transport ammonia, urea solutions and other high-pressure media.