3J53 Constant Elastic Alloy Bar
3J53 Constant Elastic Alloy Bar is a Ni-Fe-Cr-Ti-Al precision elastic alloy bar designed for stable elastic modulus, high elasticity, high strength and good dimensional stability. It is also known as UNS N09902 Bar, Ni-Span C-902 Bar, Ni42CrTiAl Bar, 42HXTЮ Bar, Sumispan-3 Bar and constant elastic alloy rod.
SASA ALLOY supplies 3J53 bars, 3J53 round bars, 3J53 rods, forged bars and precision machined bar stock in customized diameter, length, tolerance and surface finish. MTC (Mill Test Certificate), EN 10204 3.1 certificate, PMI inspection, dimensional inspection, mechanical testing, elastic performance testing and third-party inspection can be provided according to project requirements.
Product Parameters
| Item | Details |
|---|---|
| Product Name | 3J53 Constant Elastic Alloy Bar / UNS N09902 Bar / Ni-Span C-902 Rod |
| Grade | 3J53 / UNS N09902 / Ni-Span C-902 / Ni42CrTiAl / 42HXTЮ |
| Material Type | Nickel-Iron-Chromium-Titanium-Aluminum constant elastic precision alloy |
| Shape & Sizes | Round bar, rod, forged bar, machined bar; common diameter 6 mm – 200 mm, customized size available |
| Length | 1000 mm – 6000 mm, cut-to-length available according to customer drawing |
| Surface Finish | Black, bright, peeled, turned, polished, ground |
| Standards | YB/T 5256, YB/T 5254, GB/T 15002, GB/T 15001 or customer specification |
| Tolerance | Standard tolerance, h9, h11, k12 or customized tolerance according to drawing |
| Certificate | MTC, EN 10204 3.1 certificate, PMI report, dimensional inspection report, mechanical test report and third-party inspection available |
Chemical Composition
The following chemical composition is a typical reference range for 3J53 / UNS N09902 / Ni-Span C-902 constant elastic alloy bar. Final chemical values should be confirmed according to the actual Mill Test Certificate.
| Element | Content (%) | Function in Alloy |
|---|---|---|
| Nickel (Ni) | 41.5 – 43.0 | Supports elastic stability, corrosion resistance and alloy structure |
| Chromium (Cr) | 5.2 – 5.8 | Improves corrosion resistance and oxidation resistance |
| Titanium (Ti) | 2.3 – 2.7 | Supports precipitation strengthening and elastic performance after aging |
| Aluminum (Al) | 0.5 – 0.8 | Helps develop aging response and stable elastic properties |
| Iron (Fe) | Balance | Base element for Ni-Fe-Cr-Ti-Al constant elastic alloy |
| Carbon (C) | ≤ 0.05 | Controlled impurity for mechanical and elastic performance |
| Silicon (Si) | ≤ 0.80 | Controlled residual element for processing stability |
| Manganese (Mn) | ≤ 0.80 | Controlled residual element and processing support |
| Phosphorus (P) | ≤ 0.020 | Controlled impurity for clean structure and reliability |
| Sulfur (S) | ≤ 0.020 | Controlled impurity for processing quality |
Mechanical Properties
3J53 is mainly selected for constant elastic modulus, stable frequency-temperature behavior and precision elastic performance. Mechanical properties may vary depending on bar diameter, cold working condition, aging treatment and final processing route.
| Property | Reference Value | Engineering Meaning |
|---|---|---|
| Material Type | Constant elastic precision alloy | Designed for precision elastic and frequency components |
| Elastic Modulus | Approx. 176400 – 191100 MPa | Supports stable elastic response in precision components |
| Tensile Strength | Approx. ≥ 1225 MPa | High strength after cold working and aging treatment |
| Hardness | Approx. 350 – 450 HV | Supports wear resistance and dimensional stability |
| Density | Approx. 8.0 g/cm³ | Useful for weight calculation and component design |
| Frequency-Temperature Coefficient | Low in selected temperature range | Suitable for resonant elements, filters and timing components |
| Elastic Stability | High after aging treatment | Important for diaphragms, bellows, springs and sensors |
Common Size Table
| Diameter | Typical Length | Surface Finish | Common Use |
|---|---|---|---|
| 6 – 12 mm | 1000 – 3000 mm | Bright, polished, ground | Small sensor parts, resonance reeds, precision instrument components |
| 14 – 30 mm | 2000 – 6000 mm | Peeled, turned, bright | Elastic rods, spring parts, machined instrument components |
| 32 – 60 mm | 3000 – 6000 mm | Black, peeled, rough turned | Diaphragm blanks, bellows components, precision elastic assemblies |
| 65 – 120 mm | Cut-to-length | Forged, rough turned, machined | Large elastic elements and custom machined precision parts |
| Above 120 mm | Customized | Forged, rough machined | Special project components and customized elastic assemblies |
Different Specifications Comparison
| Product Form | Main Feature | Recommended Application | Selection Advice |
|---|---|---|---|
| 3J53 Round Bar | Good balance of elastic stability and machinability | Precision sensors, rods, machined elastic elements | Recommended for standard bar machining and elastic part production |
| 3J53 Forged Bar | Suitable for larger sizes and heavy-duty precision components | Large diaphragms, bellows blanks, project-specific elastic parts | Recommended for large size and customized precision parts |
| 3J53 Bright Bar | Better surface finish and dimensional control | Precision instruments, medical device components, sensors | Recommended when tight tolerance and surface quality are important |
| 3J53 Ground Bar | Smooth surface and improved size accuracy | CNC parts, precision shafts and elastic sensing components | Recommended for final machining allowance control |
| 3J53 Strip / Sheet | Suitable for diaphragms, bellows, reeds and frequency components | Resonance reeds, mechanical filters, tuning forks, bellows | Recommended when thin section or sheet geometry is required |
Equivalent Standards and International Names
| Standard / Name | Designation | Remarks |
|---|---|---|
| Chinese Grade | 3J53 | Constant elastic alloy grade |
| UNS Number | UNS N09902 | Common international designation for Ni-Span C-902 type alloy |
| Common Trade Name | Ni-Span C-902 / Ni-Span C | Widely used name for constant elastic alloy applications |
| Alternative Name | Ni42CrTiAl / Sumispan-3 | Indicates nickel-chromium-titanium-aluminum alloy system |
| Russian Reference | 42HXTЮ | Common international equivalent or similar reference |
| Aerospace Reference | AMS 5225 | Common reference for Ni-Span C-902 type material |
| Chinese Standard | YB/T 5256 / YB/T 5254 | Technical reference for constant elastic alloys |
| Product Family | 3J Series Elastic Alloy | Includes 3J01, 3J09, 3J21 and 3J53 elastic alloy products |
Production Process Flow
| Step | Process | Quality Control Focus |
|---|---|---|
| 1 | Raw Material Selection | Check Ni, Cr, Ti, Al, Fe content, raw material source and heat number traceability |
| 2 | Melting / Refining | Control nickel, chromium, titanium, aluminum and impurity elements |
| 3 | Ingot / Billet Preparation | Ensure suitable billet quality for rolling, forging or drawing |
| 4 | Hot Rolling / Forging | Control bar size, internal structure and deformation process |
| 5 | Solution Treatment | Improve processability and prepare material for later aging |
| 6 | Cold Working / Straightening | Adjust dimensional accuracy, strength and processing condition |
| 7 | Aging / Constant Elastic Treatment | Develop elastic stability, strength and low temperature coefficient behavior |
| 8 | Peeling / Turning / Grinding | Improve surface quality and dimensional tolerance |
| 9 | Inspection and Testing | PMI, chemical analysis, dimensional inspection, surface inspection and mechanical test if required |
| 10 | Packaging and Shipment | Protective wrapping, wooden case, label, heat number and shipping mark |
Product Inspection
| Inspection Item | Inspection Method | Purpose |
|---|---|---|
| Chemical Composition | Spectrometer analysis / laboratory test | Confirm 3J53 Ni-Fe-Cr-Ti-Al alloy grade and element control |
| PMI Test | Positive Material Identification | Prevent material mix-up and wrong grade shipment |
| Mechanical Test | Tensile strength, elastic modulus, hardness or other required test | Verify mechanical performance according to order requirement |
| Elastic Performance Test | Customer-defined elastic modulus or frequency-temperature test | Verify constant elastic performance for sensors and frequency components |
| Dimension Inspection | Caliper, micrometer, straightness inspection | Confirm diameter, length, tolerance and straightness |
| Surface Inspection | Visual inspection and surface quality check | Check cracks, scratches, oxidation, peeling defects and surface finish |
| Ultrasonic Testing | UT inspection if required | Check internal defects for critical bars and forged sections |
| Certificate | MTC / EN 10204 3.1 / inspection report | Ensure material traceability and project documentation |
Product Packaging
| Packaging Item | Details | Benefit |
|---|---|---|
| Surface Protection | Plastic film, anti-rust paper, oil protection or protective wrapping | Protects bar surface from scratches and oxidation during transportation |
| Bundle Packing | Bars bundled with steel strips or protective belts | Prevents movement, bending and collision |
| Wooden Case / Wooden Pallet | Export-standard wooden case or pallet | Suitable for long-distance sea, air and truck shipment |
| Labeling | Grade, size, heat number, quantity, net weight and customer mark | Improves material traceability after delivery |
| Document Support | Packing list, invoice, MTC, EN 10204 3.1 certificate and inspection report if required | Supports customs clearance and project acceptance |
Applications & Machinability
Applications
| Industry | Typical Parts | Why 3J53 Bar Is Used |
|---|---|---|
| Medical Instruments | Precision sensor parts, elastic elements, diaphragm components, instrument assemblies | Stable elastic performance and good dimensional reliability for sensitive instrument components |
| Aerospace | Precision elastic parts, sensor components, resonance reeds and control system elements | Low elastic modulus temperature coefficient supports stable performance in precision systems |
| Marine Hardware | Elastic sensor parts, bellows components, precision control elements | Can be used where elastic stability and moderate corrosion resistance are required; surface protection should be considered |
| Chemical Processing | Instrument elastic parts, pressure sensing diaphragms, control device components | Suitable for precision elastic function parts; corrosion environment should be evaluated before material selection |
| Instrumentation & Frequency Devices | Mechanical filter vibrators, tuning forks, reeds, diaphragms, bellows and precision springs | Constant elastic behavior and frequency stability make it suitable for precision resonant components |
Machinability, Welding and Heat Treatment
| Processing Property | Performance | Recommendation |
|---|---|---|
| Machinability | Machinable after proper treatment; not a free-cutting alloy like 303 stainless steel | Use rigid machines, sharp carbide tools, suitable cutting speed and sufficient coolant |
| Forming Performance | Can be processed into elastic components under suitable condition | Forming should be planned according to final hardness, modulus and aging treatment requirement |
| Welding Performance | Welding may be possible with proper procedure, but elastic stability and heat-affected zone should be considered | Confirm welding procedure, heat treatment and final elastic performance before fabrication |
| Heat Treatment | Cold working and aging treatment are important for constant elastic performance | Final heat treatment should follow modulus, strength and temperature coefficient requirements |
| Cold Working | Cold working can increase strength and affect elastic modulus behavior | Final aging or stress-relief treatment may be required after forming or machining |
| Surface Protection | Surface oxidation may occur during storage and transportation | Use oil protection, dry storage and export protective packaging |
Why Choose SAKY STEEL?
| Advantage | Description |
|---|---|
| Professional Precision Alloy Supply | SAKY STEEL supplies precision alloys including 3J53, 3J01, 3J09, 3J21, 1J soft magnetic alloys, 2J permanent magnetic alloys, 4J expansion alloys and 6J resistance alloys for industrial and high-performance applications. |
| Customized Size Capability | Diameter, length, surface finish, tolerance, cutting service and machining allowance can be customized according to customer drawings or project requirements. |
| Quality Control and Traceability | Material traceability, heat number control, PMI testing, dimensional inspection, surface inspection, mechanical testing and elastic property testing can be arranged. |
| Certificate Support | We can provide MTC (Mill Test Certificate / 质保书), EN 10204 3.1 certificate, PMI report, inspection report and other quality documents according to order requirements. |
| Export Packaging Experience | Export wooden cases, wooden pallets, protective wrapping, oil protection and clear labels help ensure safe delivery for international shipments. |
| Technical Service Support | Our team can support grade selection, equivalent standard checking, heat treatment discussion, elastic modulus requirement confirmation and technical document preparation before shipment. |
FAQ
Q1: What is 3J53?
3J53 is a constant elastic alloy, also known as UNS N09902, Ni-Span C-902, Ni42CrTiAl and 42HXTЮ. It is used for diaphragms, bellows, springs, precision sensors, mechanical filter vibrators, tuning forks and resonance components.
Q2: What is the main feature of 3J53 constant elastic alloy?
The main feature of 3J53 is its low elastic modulus temperature coefficient and stable elastic performance. It can obtain high elasticity and strength after cold working and aging treatment.
Q3: What is the equivalent grade of 3J53?
3J53 is commonly associated with UNS N09902, Ni-Span C-902, Ni-Span C, Sumispan-3, Ni42CrTiAl, 42HXTЮ and AMS 5225 references. Buyers should confirm chemical composition and product standards before ordering.
Q4: Can SASA ALLOY provide 3J53 with MTC?
Yes. SASA ALLOY can provide MTC (Mill Test Certificate / 质保书), EN 10204 3.1 certificate, PMI report, dimensional inspection report, mechanical test report and third-party inspection documents according to customer requirements.
Q5: What sizes of 3J53 Bar are available?
Common diameters include 6 mm to 200 mm. Length, tolerance and surface finish can be customized. Cut-to-length service is available for precision machining and elastic component production.
Q6: Is 3J53 easy to machine?
3J53 is machinable, but it is not a free-cutting alloy like 303 stainless steel. Rigid equipment, sharp carbide tools, suitable cutting speed and sufficient coolant are recommended.
Q7: Can 3J53 be welded?
Welding may be possible with proper procedure, but heat input and final elastic stability should be considered. For critical diaphragms, sensors or resonance parts, customers should confirm welding and post-weld heat treatment before fabrication.
Q8: Does 3J53 require heat treatment?
Yes. Cold working and aging treatment are important for achieving high strength, stable elastic modulus and constant elastic performance. Final heat treatment should be selected according to project specifications and property targets.
Q9: What applications use 3J53?
3J53 is used in precision sensors, diaphragms, bellows, springs, mechanical filter vibrators, tuning forks, resonance reeds, instrument components and precision elastic assemblies.
Q10: How can I get a quotation for 3J53?
Please send your required grade, diameter, length, quantity, surface finish, tolerance, heat treatment condition, elastic modulus requirement, mechanical property requirement and certificate requirements to SASA ALLOY. Our team will check availability, production route, delivery time and price for your project.
