Material selection for the spiral tubes (core heat exchange element) of a spiral heat exchanger.The choice primarily depends on three core factors: the characteristics of the medium (corrosiveness, temperature, pressure), the required heat exchange efficiency, and the cost budget. Priority should be given to balancing corrosion resistance, thermal conductivity, and structural strength. The following is a detailed description of commonly used material classifications, properties, and applicable scenarios:
Commonly Used Basic Materials (Applicable to General Working Conditions)
1. Core characteristics of carbon steel (Q235, 20# steel):
It has a high thermal conductivity (approximately 45 W/(m·K)), low cost, easy processing and welding, and good structural strength;It has poor corrosion resistance and is only suitable for non-corrosive, clean fluids (such as clean water, saturated steam, and industrial gases/liquids without acids or alkalis).
2. Stainless steel (304, 316L, 321)Key characteristics:
High corrosion resistance (304 resistant to weak corrosion, 316L resistant to strong corrosion, contains molybdenum, 321 resistant to intergranular corrosion); Moderate thermal conductivity (304 approximately 16 W/(m・K), slightly lower than carbon steel), high temperature resistance (continuous operating temperature ≤600℃), easy to clean, meets food/pharmaceutical hygiene standards; Higher cost than carbon steel, moderate welding process requirements.
Corrosion-resistant high-performance materials (suitable for highly corrosive working conditions)
1. Titanium alloys (TA1, TA2)
Core features:It has extremely strong corrosion resistance (it can withstand almost all acid and alkali media, including concentrated hydrochloric acid, sulfuric acid, chlor-alkali solution, and seawater), and there is no risk of pitting corrosion or crevice corrosion.
2.Hastelloy (C-276, C-22)Key characteristics:
Corrosion-resistant ultra-stainless steel (resistant to oxidizing acids, reducing acids, fluorine/chlorine-containing media, and high-temperature corrosion); High temperature resistance (≤800℃), high strength, suitable for extreme working conditions; Extremely high cost (approximately 1.5-2 times that of titanium alloys), and difficult to process.
3.Copper and copper alloys (pure copper T2, brass H68, cupronickel B30)Key characteristics:
Extremely high thermal conductivity (approximately 401 W/(m·K) for copper, more than 20 times that of stainless steel), resulting in optimal heat exchange efficiency; Copper has moderate corrosion resistance (suitable for neutral media without oxidation), brass has slightly lower corrosion resistance, and cupronickel (copper-nickel alloy) is resistant to seawater and chlorine-containing media corrosion; Moderate cost (higher than carbon steel, lower than stainless steel), and easy to process and bend (suitable for spiral winding).
If you want to know more about heat exchanger units or are interested in purchasing, please send an email to 9988xiaoshuai@gmail.com, we will reply you in time after seeing the message!
Professional team
Our company is equipped with a high-quality after-sales service team with technical personnel as the core, and will provide timely feedback upon receiving service information notifications from users.
7x24 Technical Services
Our company provides free technical support for the products we sell and organizes technical training for relevant personnel.
