Chemical Seamless Steel Pipe Definition, Characteristics, Materials

Chemical seamless steel pipe refers to seamless steel pipe used in chemical and related industrial fields. Due to the complex chemical production environment, diverse media, and high performance requirements for pipelines, chemical seamless steel pipes have their own particularities in terms of material, manufacturing process, and performance. Permanent Steel Manufacturing Co., Ltd carefully summarizes the definition, characteristics, materials and other related information of chemical seamless steel pipes:
 
 Definition and characteristics
 
Chemical seamless steel pipe refers to seamless steel pipe used for equipment and pipelines in chemical, fertilizer, petrochemical and other industries. Its main features are:
 
1. Strong corrosion resistance: There are many types of media in chemical production, including corrosive substances such as acids, alkalis, and salts. Therefore, chemical seamless steel pipes need to have good corrosion resistance to ensure the safe operation and service life of the pipeline.
2. Resistant to high temperature and high pressure: Many chemical reactions need to be carried out under high temperature and high pressure conditions, so chemical seamless steel pipes need to have good high temperature strength, creep resistance and high pressure bearing capacity.
3. Good sealing: Leakage of media in chemical production can cause environmental pollution and safety accidents, so chemical seamless steel pipes need to have good sealing to prevent media leakage.
4. Special material requirements: Depending on the conveying or storage medium, seamless steel pipes of different materials need to be selected, such as stainless steel, alloy steel, special alloys, etc.
 
Implementation Standards
 
The main standards for chemical seamless steel pipes are:
 
GB 6479: Seamless Steel Tubes for High-Pressure Fertilizer Equipment, a commonly used standard in China's chemical industry, specifies the technical requirements for seamless steel tubes for equipment and pipelines in fertilizer and chemical plants with working temperatures between -40 and 400°C and working pressures between 10 and 32 MPa.
GB/T 8162: Seamless Steel Tubes for Structural Use. This standard applies to seamless steel tubes for general structures and mechanical structures.
GB/T 8163: "Seamless steel pipes for conveying fluids". This standard applies to seamless steel pipes for conveying fluids such as water, oil and gas.
ASTM A106/A53/A333/A335: Relevant standards of the American Society for Testing and Materials (ASTM), widely used internationally.
DIN 17175/DIN 2448: Relevant standards of the German Institute for Standardization (DIN).
JIS G3445/G3454/G3455: Related standards of Japanese Industrial Standards (JIS).
According to the specific application and medium characteristics, the appropriate standard can be selected.
 
Common materials
 
Common materials for chemical seamless steel pipes include:
Carbon steel: such as 20#, Q235B, Q345B seamless pipes, etc., suitable for conveying general media and relatively low in price.
Alloy steel: such as 16Mn, 12Cr1MoV, 15CrMoG, 20CrMo, 42CrMo, etc., have high strength, heat resistance and corrosion resistance, and are suitable for high temperature, high pressure or highly corrosive media.
Stainless steel: such as 304, 316L, 321, etc., has excellent corrosion resistance and is suitable for conveying corrosive media such as strong acids and alkalis.
Special alloys: For special corrosive media or working conditions, it may be necessary to select seamless steel pipes made of special alloys such as nickel-based alloys, titanium alloys, and zirconium alloys.
 
Main application areas
 
Fertilizer production: High-pressure pipelines, reactors and other equipment used in the production of synthetic ammonia, urea and other fertilizers.
Petrochemical industry: used in oil refining (9948 oil cracking pipe - oil cracking pipe manufacturer - seamless steel pipe for oil cracking), transportation pipelines, heat exchangers, reactors and other equipment in the production process of chemical products.
Fine chemicals: Pipes and equipment used in the production of various fine chemicals, intermediates, etc.
Pharmaceutical industry: Used for pipelines and equipment in the drug production process, which have high hygiene requirements.
 
Purchase Notes
 
1. When purchasing chemical seamless steel pipes, you need to pay attention to the following matters:
2. Clarify the operating conditions: including medium type, temperature, pressure, etc., in order to select appropriate materials and specifications.
3. Choose the appropriate standard: Select the appropriate implementation standard according to the usage requirements.
4. Choose a reputable supplier: Choose an experienced and reputable supplier to ensure product quality and after-sales service.
5. Provide necessary technical documents: Provide suppliers with detailed technical requirements and drawings so that they can accurately understand your needs.
6. Carry out necessary inspections: After receiving the goods, necessary inspections should be carried out, such as appearance inspection, dimensional inspection, chemical composition analysis, mechanical properties testing, etc., to ensure that the product meets the requirements.

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