Manufacturing process Of Welded Stainless Steel Pipe
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GB/T 30066: 06Cr11Ti, 022Cr11Ti, 022Cr12Ni, 06Cr13, 06Cr14Ni2MoTi Welded Ferritic Heat Exchanger Stainless Steel Tube
Introduction
This article provides a comprehensive overview of the ferritic stainless steel tubes specified under GB/T 30066, including their material specifications, key features, chemical composition, mechanical properties, similar standards, and steel grades. These tubes are primarily used in heat exchangers due to their excellent corrosion resistance and mechanical strength.
Material Specifications
The ferritic stainless steel tubes covered by GB/T 30066 include the following grades:
- 06Cr11Ti
- 022Cr11Ti
- 022Cr12Ni
- 06Cr13
- 06Cr14Ni2MoTi
These materials are designed for high-temperature and corrosive environments, making them ideal for use in heat exchangers.
Key Features
- Excellent corrosion resistance, particularly against chloride stress corrosion cracking.
- High thermal conductivity and good oxidation resistance.
- Suitable for welded construction, ensuring structural integrity.
- Maintains mechanical strength at elevated temperatures.
Chemical Composition
Below is the chemical composition of the specified grades:
| Grade | C | Si | Mn | P | S | Cr | Ni | Ti |
|---|---|---|---|---|---|---|---|---|
| 06Cr11Ti | ≤0.08 | ≤1.0 | ≤1.5 | ≤0.035 | ≤0.030 | 11.0-13.0 | - | 0.5-0.8 |
| 022Cr11Ti | ≤0.03 | ≤1.0 | ≤1.5 | ≤0.030 | ≤0.020 | 10.5-12.5 | - | 0.5-0.8 |
| 022Cr12Ni | ≤0.03 | ≤1.0 | ≤1.5 | ≤0.030 | ≤0.020 | 11.5-13.5 | 1.5-3.0 | - |
| 06Cr13 | ≤0.08 | ≤1.0 | ≤1.5 | ≤0.035 | ≤0.030 | 12.0-14.0 | - | - |
| 06Cr14Ni2MoTi | ≤0.08 | ≤1.0 | ≤1.5 | ≤0.035 | ≤0.030 | 13.0-15.0 | 1.5-2.5 | 0.5-0.8 |
Mechanical Properties
The mechanical properties of these grades are as follows:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 06Cr11Ti | ≥205 | ≥490 | ≥25 | ≤200 |
| 022Cr11Ti | ≥205 | ≥490 | ≥25 | ≤200 |
| 022Cr12Ni | ≥205 | ≥490 | ≥25 | ≤200 |
| 06Cr13 | ≥205 | ≥490 | ≥25 | ≤200 |
| 06Cr14Ni2MoTi | ≥205 | ≥490 | ≥25 | ≤200 |
Similar Standards and Steel Grades
- ASTM A269: Equivalent to GB/T 30066 for welded austenitic and ferritic stainless steel tubes.
- EN 10217-7: Covers ferritic stainless steel welded tubes for high-temperature applications.
- ISO 15510: General specification for ferritic stainless steel pipes.
Other steel grades that may be considered similar include:
- SUS430: Japanese equivalent for 06Cr13.
- X5CrNi18-10: European equivalent for austenitic stainless steel.
Application
The ferritic stainless steel tubes specified under GB/T 30066 are predominantly used in heat exchangers across various industries, including:
- Power generation (boilers, condensers)
- Petrochemical processing
- Desalination plants
- HVAC systems
These tubes offer a balance of cost-effectiveness and performance, making them a popular choice for demanding industrial applications.
Conclusion
GB/T 30066 specifies a range of ferritic stainless steel tubes that are well-suited for heat exchanger applications. Their robust chemical composition and mechanical properties ensure reliable performance in high-temperature and corrosive environments. By adhering to international standards, these materials provide a globally recognized solution for industrial heat transfer needs.
References
- GB/T 30066-2013, "Welded Ferritic Stainless Steel Tubes for Heat Exchangers"
- ASTM A269, "Standard Specification for Seamless and Welded Austenitic and Ferritic Stainless Steel Tubing for General Service"
- EN 10217-7, "Technical delivery conditions for pressure-resistant steel tubes of non-alloy and fine grain steels"
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