Nickel 200 Alloy Capillary Tube
Product Introduction
The biggest weakness of Nickel 200 alloy capillary tubes is their poor resistance to strong oxidizing environments. For example, corrosion will be accelerated in hot concentrated nitric acid or acids containing high-valence metal ions (such as Fe³⁺, Cu²⁺). It is essential to confirm whether the intended use environment is suitable before purchasing.
The Nickel 200 capillary tube project is a "technology-first" endeavor. You need a deep understanding of its performance characteristics and manufacturing challenges, and to select qualified suppliers using clear standards and testing requirements. This ensures that you are not just buying "a tube," but a key functional component that meets design expectations. Please get in touch with us for a technical specification sheet or a quote.
Procurement Specifications and Industry Standards
Our procurement experience tells us that when purchasing Nickel 200 alloy capillary tubes, we need to clearly communicate details to avoid trade disputes. This generally includes the following points:
1. Specifications:
The outer diameter, wall thickness, length, and tolerances of the capillary tubes must be clearly specified when ordering. Common outer diameters range from less than 1 mm to over ten mm, and wall thicknesses can be as thin as 0.1 mm or less. This must be specified in the drawings or contract.
2. Core Industry Standards:
These include domestic standards: the latest and most commonly used is GB/T 2882-2023, and international standards: commonly ASTM B161/B161M. Besides these two, you can contact our engineers to clarify the production standards as needed.
3. Product Condition and Packaging:
Based on the final working condition, communicate with our engineers to clarify the delivery condition, such as soft state (M state, i.e., annealed state), semi-hard state, or hard state. This directly affects its processing and performance. Appropriate packaging should also be matched to the shape to avoid material loss during transportation. Our commonly supplied capillary tubes are packaged in various ways, including stretch film + cardboard/plastic box, vacuum/inert gas packaging, foam, simple bundled or bagged packaging, etc.
Manufacturing Process and Challenges
Purchasing requires understanding the processing characteristics, as this relates to the final product quality and potential problems arising from secondary processing. Whether purchasing raw materials, machining simple parts, or precision-machined parts, the following points should be noted by skilled machining personnel regarding secondary processing:
Core Process:
High-quality Nickel 200 alloy capillary tubes are primarily produced using cold rolling/cold drawing processes, resulting in high dimensional accuracy and surface finish. Intermediate or final annealing heat treatment is necessary to relieve stress and restore plasticity.
Difficult to cut/grind:
Common capillary tubes have good toughness but are prone to work hardening, and their poor thermal conductivity leads to heat accumulation. Machining requires specialized tools (such as coated carbide), sufficient coolant, and controlled cutting speed; otherwise, tool wear is rapid, resulting in poor workpiece accuracy and surface quality.
For more information, please contact:
Email: susan@lorkgroup.com
WhatsApp: +86 19937075488
Chemical Composition
When procuring goods, suppliers are required to provide material reports, primarily to verify nickel content and impurity control. The following is a typical range:
| Weight% | Nickel 200 |
| Ni | Residual component |
| Si | ≤ 0.35% |
| Mn | ≤ 0.35% |
| Fe | ≤ 0.40% |
| C | ≤ 0.15% |
Mechanical Properties
Mechanical properties are greatly affected by the product's form and condition (e.g., annealed, hardened). Our manufacturing experience largely dictates that Nickel 200 alloy capillary tubes are in the annealed state. The following is a typical range for seamless annealed tubes:
| Material | (Annealed state) |
| Tensile Strength MPa | 380 - 450 |
| Yield Strength MPa | 100 - 200 |
| Reduction of Area % | ≥ 40%(Key indicators of good plasticity) |
| Hardness HB | ≤ 70 HB |
Key points of the quality inspection process
Due to the high price and long lead time of purchasing Nickel 200 alloy capillary tubes, we generally recommend that customers have the products tested by an authoritative third-party organization after production to ensure quality. We also suggest including the following testing requirements in the contract and requesting a third-party organization (such as a laboratory with CMA/CNAS accreditation, like SGS, which our customers commonly use) to conduct inspections.
| Test Category | Core Test Items | Purpose and Explanation |
| Chemical Composition | Nickel and impurity element content | Verify whether the material grade meets the standards. |
| Mechanical Properties | Tensile strength, yield strength, and elongation | Verify whether the material condition and basic properties meet the standards. |
| Dimensions and Appearance | Outer diameter, wall thickness, length, ovality, surface finish/defects | Use calipers, micrometers, eddy current testing, etc. Pay special attention to the cleanliness of the capillary inner wall and surface scratches. |
| Process Performance | Flaring/flattening test, bending test | These tests examine the material's plasticity and formability, which are crucial for subsequent assembly. |
| Corrosion Resistance | Intergranular corrosion test (e.g., ASTM A262) | This test is very important for annealed materials used in corrosive environments. |
| Non-destructive Testing | Eddy current testing or ultrasonic testing | Quickly screen for surface and near-surface defects such as cracks and inclusions. |
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