ZYTC Alloy Successfully Delivers 3J21 Elgiloy Alloy Bar to Turkey – Precision Engineered to YB/T 5253
ZYTC Alloy continues to expand its global footprint with the latest export of 3J21 Elgiloy Alloy Bar to a valued customer in Turkey. This order, featuring ø5×1000mm bars produced to YB/T 5253, underscores our commitment to quality and precision. As one of our most mature materials, 3J21 has been shipped to numerous countries and is trusted in aerospace, medical, and industrial applications.
At ZYTC Alloy, every 3J21 product is manufactured under a strict philosophy of standardization, process control, and specialised production. From melting to final inspection, each step follows documented procedures. The Turkish order of 3J21 bars underwent full non‑destructive testing, dimensional verification, and mechanical property checks – all in accordance with YB/T 5253‑2011. The results confirmed 3J21’s exceptional consistency and reliability.
3J21 (internationally known as Elgiloy, UNS R30003, Phynox, or Co40CrNiMo) is a cobalt‑chromium‑nickel‑molybdenum based high‑elasticity alloy belonging to the deformation‑strengthened Cobalt Alloy family. In the solution‑annealed state, 3J21 exhibits excellent formability. Through cold working and age‑hardening, 3J21 achieves outstanding tensile strength, elastic modulus, and fatigue resistance. These characteristics make 3J21 a preferred choice for precision components that require non‑magnetic behaviour, corrosion resistance, and stability over a wide temperature range (–184°C to 454°C).
Key properties of 3J21:
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Non‑magnetic – ideal for sensitive instruments and avionics
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Excellent corrosion resistance in marine, chemical, and sour‑gas environments
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High elasticity and strength – maintains spring performance under cyclic load
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Superior fatigue life – suitable for long‑service components
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Good wear resistance and vibration damping – reduces noise in mechanical systems
Chemical Composition of 3J21 (per YB/T 5253-2011)
| Element | Content (wt%) | Notes |
|---|---|---|
| Co (Cobalt) | 39.0 – 41.0 | Critical element, tight tolerance ±1% |
| Cr (Chromium) | 19.0 – 21.0 | Provides oxidation resistance and non‑magnetic stability |
| Ni (Nickel) | 14.0 – 17.0 | Core for corrosion resistance and elastic modulus |
| Mo (Molybdenum) | 6.5 – 7.5 | Solid‑solution strengthening, high‑temperature performance |
| Mn (Manganese) | 1.5 – 2.5 | Narrow range; deviation >0.1% causes rejection |
| Si (Silicon) | ≤ 0.60 | Standard control |
| C (Carbon) | ≤ 0.05 | Ultra‑low carbon grade |
| P (Phosphorus) | ≤ 0.015 | Ultra‑low, high‑purity smelting required |
| S (Sulfur) | ≤ 0.015 | Ultra‑low requirement |
| Fe (Iron) | Balance | Remainder |
Physical Properties of 3J21
| Property | Value |
|---|---|
| Density | 8.4 g/cm³ |
| Melting Range | 1372 – 1405°C |
| Elastic Modulus (E) | 196,000 – 215,500 MPa |
| Shear Modulus (G) | 73,500 – 83,500 MPa |
| Electrical Resistivity | 0.92 μΩ·m |
| Magnetic Susceptibility (K) | 50 – 1000 (×10⁻⁶) |
Mechanical Properties of 3J21 – As‑Delivered (per YB/T 5253)
| Product Form | Diameter/Thickness | Delivery Condition | Tensile Strength Rm (MPa) | Elongation A (%) |
|---|---|---|---|---|
| Bar | 5.0 – 8.0 mm | Cold Drawn | ≥ 1370 | ≥ 2.0 |
| Bar | 8.0 – 30.0 mm | Hot Rolled | As specified | As specified |
| Bar | 30.0 – 180.0 mm | Hot Forged | As specified | As specified |
| Strip | 0.1 – 3.5 mm | Cold Rolled | ≥ 1370 | ≥ 2.0 |
| Wire | 0.1 – 5.0 mm | Cold Drawn | ≥ 1370 | ≥ 2.0 |
After solution treatment and aging (typically 650–680°C for 4–6 hours), 3J21 reaches tensile strength ≥ 1765 MPa with elastic modulus E maintained at 196–206 GPa – values that fully comply with YB/T 5253.
Typical Applications of 3J21
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Aerospace & Aviation – engine control springs, fuel regulator diaphragms, missile actuator elastic elements, bellows, and capsule assemblies
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Precision Instruments – sensor diaphragms, balance springs, clock hairsprings, suspension wires, and galvanometer suspensions
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Medical Devices – surgical implants, orthopaedic fixation devices, dental wires, and miniature springs for drug‑delivery systems
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Nuclear Industry – control rod drive mechanism springs and sealing elements
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Petrochemical & Oil/Gas – high‑temperature valve seals, pressure sensor elastomers, and components resisting sulfide stress corrosion cracking
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Marine Engineering – corrosion‑resistant fasteners and spring elements in seawater environments
Product Forms of 3J21 Available from ZYTC Alloy
ZYTC Alloy supplies 3J21 in a comprehensive range to suit any requirement:
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3J21 Plate – custom thickness and dimensions
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3J21 Strip – 0.01 – 3.0 mm thick × 1 – 300 mm wide
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3J21 Wire – 0.025 – 5.0 mm diameter, cold drawn
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3J21 Bar – hot forged Φ12 – 400 mm × 2500 mm; cold drawn Φ2.0 – 12 mm
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3J21 Tube – seamless or welded, custom sizes
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3J21 Forgings – rings, discs, flanges, and bespoke shapes
We also accept drawings for custom‑shaped 3J21 components and execute production strictly to YB/T 5253 and customer specifications.
Why ZYTC Alloy for 3J21?
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Full compliance – every batch is certified to YB/T 5253‑2011 with complete traceability
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Custom manufacturing – we machine, form, or finish 3J21 per your drawings
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Fast delivery – competitive lead times, even for complex orders
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Cost‑effective – high quality at reasonable prices, backed by years of production experience
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Global export track record – 3J21 from ZYTC Alloy has been shipped to multiple countries across Europe, Asia, and the Americas, proving consistent performance
International Equivalents of 3J21
Contact ZYTC Alloy for Your 3J21 Needs
Whether you require 3J21 bar, plate, strip, wire, tube, forgings, or custom‑machined parts, ZYTC Alloy is your reliable partner. Our unwavering commitment to standardisation, process discipline, and specialised inspection guarantees that every shipment of 3J21 meets the highest international standards – on time and within budget.
ZYTC Alloy – Excellence in 3J21 Elgiloy Alloy Solutions.
