Views: 222 Author: Robert Publish Time: 2025-04-27 Origin: Site
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● What Is 2507 Stainless Steel Capillary Tubing?
>> Key Chemical Composition of 2507 Stainless Steel
● Manufacturing Process of 2507 Stainless Steel Capillary Tubing
>> 1. Raw Material Preparation
>> 2. Hot Rolling and Annealing
>> 3. Tube Extrusion or Piercing
>> 6. Surface Treatment and Finishing
● Mechanical and Physical Properties of 2507 Stainless Steel Capillary Tubing
● Applications of 2507 Stainless Steel Capillary Tubing
● Frequently Asked Questions (FAQs)
>> 1. What makes 2507 stainless steel capillary tubing superior to other stainless steel grades?
>> 2. What are the typical sizes available for 2507 stainless steel capillary tubing?
>> 3. Can 2507 stainless steel capillary tubing be welded?
>> 4. What industries commonly use 2507 stainless steel capillary tubing?
>> 5. How is the corrosion resistance of 2507 stainless steel capillary tubing tested?
2507 stainless steel capillary tubing is a highly specialized product designed for demanding applications requiring exceptional strength, corrosion resistance, and precision. This article explores the detailed manufacturing process of 2507 stainless steel capillary tubing, highlighting its unique material properties, production techniques, and applications. Throughout the article, we will incorporate relevant images and videos to illustrate key stages and concepts, providing a comprehensive understanding of this advanced tubing.
2507 stainless steel capillary tubing is made from Super Duplex stainless steel alloy 2507, also known as UNS S32750. This alloy is characterized by a balanced duplex microstructure consisting of approximately 25% chromium, 4% molybdenum, 7% nickel, and nitrogen additions. The composition delivers superior mechanical strength and outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-rich environments such as seawater and chemical processing plants.
| Element | Content Range (%) |
|---|---|
| Chromium (Cr) | 24 – 26 |
| Nickel (Ni) | 6 – 8 |
| Molybdenum (Mo) | 3 – 5 |
| Nitrogen (N) | 0.24 – 0.32 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 1.20 |
| Silicon (Si) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
| Iron (Fe) | Balance |
This composition ensures excellent corrosion resistance and high strength, making 2507 stainless steel capillary tubing ideal for harsh industrial environments[1][3][4].
The manufacturing of 2507 stainless steel capillary tubing involves several precise steps, from raw material selection to final quality testing. The process must maintain the alloy's duplex microstructure and mechanical properties while achieving the small diameters and thin walls characteristic of capillary tubing.
The process begins with melting and casting high-quality 2507 stainless steel alloy. The raw material is melted in an electric arc furnace or vacuum induction furnace to ensure chemical homogeneity and minimize impurities. The molten metal is then cast into billets or slabs suitable for further processing.
The billets undergo hot rolling to reduce thickness and refine the grain structure. Controlled annealing follows, where the material is heated to a specific temperature and cooled rapidly to develop the duplex microstructure-a balanced mixture of austenite and ferrite phases critical for the alloy's properties.
For tubing production, the hot-rolled material is pierced or extruded to form a hollow tube. This step creates the initial tube with a relatively large diameter and wall thickness.
The tube is then subjected to multiple cold drawing passes through progressively smaller dies to reduce the outer diameter (O.D.) and wall thickness to the precise dimensions required for capillary tubing. Cold drawing improves the surface finish, dimensional accuracy, and mechanical strength due to work hardening.
- Typical outer diameters range from 0.3 mm up to around 31.75 mm.
- Wall thickness can be as thin as 0.06 mm to about 1.65 mm[1][2].
Intermediate annealing is performed between drawing passes to relieve internal stresses and restore ductility, preventing cracking during further reduction.
After final sizing, the tubing undergoes surface treatments such as pickling, passivation, bright annealing, or electrolytic polishing to remove scale, enhance corrosion resistance, and achieve a smooth, clean surface inside and out.
The finished tubing is cut to customer-specified lengths, often ranging from 1 meter up to several thousand meters in coils. The tubing is carefully packaged to prevent damage during transport.
The unique alloying and processing of 2507 stainless steel capillary tubing result in exceptional mechanical and physical properties:
| Property | Value |
|---|---|
| Yield Strength | ≥ 550 MPa (80 ksi) |
| Tensile Strength | ≥ 800 MPa (116 ksi) |
| Elongation | Minimum 15% |
| Hardness (Brinell) | Maximum 310 HB |
| Density | 7.8 g/cm³ |
| Melting Point | Approx. 1350°C (2460°F) |
| Thermal Conductivity | Higher than austenitic steels |
| Coefficient of Thermal Expansion | Lower than austenitic steels |
These properties make 2507 stainless steel capillary tubing suitable for high-pressure and corrosive environments, outperforming conventional stainless steels such as 316L[4][5][7].
Due to its outstanding corrosion resistance, strength, and precision, 2507 stainless steel capillary tubing is used in a variety of critical applications:
- Chemical Injection Lines in oil and gas industry for delivering chemicals to prevent scaling and corrosion.
- Hydraulic Control Lines requiring high strength and corrosion resistance.
- Instrumentation and Measurement Devices needing precise and reliable fluid transport.
- Medical Equipment where biocompatibility and cleanliness are essential.
- Heat Exchangers and Desalination Plants exposed to seawater and aggressive chemicals.
- Aerospace and Marine Applications demanding durability under harsh conditions[1][2][4][6].
To ensure reliability, 2507 stainless steel capillary tubing undergoes rigorous testing:
- Hydrostatic Pressure Testing to verify burst strength.
- Dimensional Inspection for precise O.D. and wall thickness.
- Surface Quality Checks to detect defects or contamination.
- Mechanical Testing for tensile strength, yield strength, and elongation.
- Corrosion Testing to confirm resistance to pitting and crevice corrosion.
The manufacturing of 2507 stainless steel capillary tubing is a complex, highly controlled process that combines advanced metallurgy with precision engineering. The resulting tubing offers exceptional corrosion resistance, mechanical strength, and dimensional accuracy, making it indispensable in demanding industries such as oil and gas, chemical processing, and instrumentation. Its unique duplex microstructure and alloy composition enable it to withstand harsh environments where traditional stainless steels would fail. Through careful raw material selection, hot and cold processing, and stringent quality control, manufacturers deliver reliable 2507 stainless steel capillary tubing tailored to exacting specifications.
2507 stainless steel capillary tubing has a duplex microstructure with high chromium, molybdenum, and nitrogen content, giving it superior resistance to pitting, crevice corrosion, and stress corrosion cracking compared to common grades like 304 or 316L. It also has higher strength, allowing for thinner walls and lighter tubing without sacrificing durability.
Sizes range from very small outer diameters of 0.3 mm up to about 31.75 mm, with wall thicknesses as thin as 0.06 mm to around 1.65 mm. Lengths can be customized from short cut lengths to coils several thousand meters long.
Yes, 2507 stainless steel has good weldability, but welding must be done carefully to preserve the duplex microstructure and corrosion resistance. Post-weld heat treatments may be required depending on the application.
Industries include oil and gas (chemical injection and hydraulic lines), chemical processing, desalination, marine, aerospace, medical devices, instrumentation, and heat exchangers.
Corrosion resistance is evaluated through laboratory tests such as pitting resistance equivalent number (PREN) measurements, exposure to chloride-containing solutions, and stress corrosion cracking tests. Hydrostatic and mechanical tests also help ensure durability under service conditions.
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