Hangbo Alloy Group
Shanghai · Est. 2012
UNS N03300 family (Permanickel 300-type) — A high-nickel, age-hardenable spring alloy strip delivering 1240–1585 MPa tensile strength with corrosion resistance and non-magnetic behavior for medical, industrial, and electronic precision springs.
Springex 300 is a high-strength, age-hardenable nickel-base spring alloy strip in the Permanickel 300 / UNS N03300 family. With a nickel content of 97% or higher, it is strengthened by a combination of cold working and aging (precipitation of fine titanium- and magnesium-rich intermetallics), delivering an outstanding balance of high ultimate tensile strength, good ductility, fatigue resistance, and corrosion resistance that carbon and most stainless spring steels cannot match.
The alloy is supplied as precision strip, foil, and wire for springs, diaphragms, and non-magnetic precision components. Its non-magnetic, electrically conductive nature and excellent corrosion resistance make it especially attractive for medical devices, electrical contacts, instruments, and marine environments where long-term spring reliability is critical. Hangbo Alloy Group manufactures and supplies Springex 300 / Permanickel 300 to agreed temper, tolerance, and certification so stamping and coiling houses receive material ready for final age hardening.
Note on designation: The grade name "Springex 300" follows the Permanickel 300 / UNS N03300 family. The nickel content, age-hardening chemistry, and spring properties described here are the verified published values for that UNS N03300 family; figures are presented as typical and should be confirmed against the ordered temper and certification.
Hangbo Alloy Group supplies Springex 300 / Permanickel 300 (UNS N03300) precision strip, foil, and wire in annealed, half-hard, spring, and spring-and-aged tempers — with tight tolerances, custom slitting, and full material certification. Request stock or mill quantities.
The chemistry of Springex 300 is that of the high-nickel, age-hardenable Permanickel 300 / UNS N03300 family. The very high nickel level provides the non-magnetic, corrosion-resistant matrix, while controlled titanium and magnesium additions give the age-hardening response that produces the high spring strength.
| Element | Typical Range (wt%) | Typical Value | Role in the Alloy |
|---|---|---|---|
| Nickel (Ni) | Remainder | ≥ 97.0 | Non-magnetic matrix, ductility, corrosion resistance |
| Cobalt (Co) | Counted in Ni | ~0 | Typically included within Ni+Co ≥ 97% |
| Carbon (C) | ≤ 0.40 | 0.15 | Solid-solution control; kept low for ductility |
| Titanium (Ti) | 0.20 – 0.60 | 0.40 | Primary age-hardening precipitate former |
| Magnesium (Mg) | 0.20 – 0.50 | 0.35 | Co-precipitate with Ti; strengthens on aging |
| Iron (Fe) | ≤ 0.60 | 0.30 | Residual; controlled impurity |
| Silicon (Si) | ≤ 0.35 | 0.15 | Deoxidation; controlled residual |
| Manganese (Mn) | ≤ 0.50 | 0.20 | Deoxidation; controlled residual |
| Copper (Cu) | ≤ 0.25 | 0.10 | Controlled residual |
| Sulfur (S) | ≤ 0.010 | 0.005 | Impurity control for hot workability |
Key insight: Unlike nickel-chromium spring alloys, Springex 300 contains essentially no chromium. Its strength comes from age-hardening (Ti/Mg precipitates) rather than solid-solutionCr. This keeps the alloy non-magnetic and electrically conductive while delivering spring properties comparable to much more highly alloyed (and more expensive) materials.
Physical properties of Springex 300 are those of a high-nickel alloy and are largely independent of temper.
| Property | Value | Notes |
|---|---|---|
| Density | 8.74 g/cm³ (0.316 lb/in³) | High-nickel value |
| Melting Point | ~1427 °C (2600 °F) | Typical for the family |
| Modulus of Elasticity | ~207 GPa (30 × 10³ ksi) | In tension |
| Thermal Expansion (20–100°C) | ~13 × 10−6 /°C | Typical (published range 12–16) |
| Thermal Conductivity (at 100°C) | ~16 W/(m·K) | Typical |
| Magnetic Properties | Non-magnetic (austenitic) in all conditions | |
| Crystal Structure | Face-Centered Cubic (FCC) | |
Springex 300 is supplied in a range of tempers. Strength rises sharply with cold work and further with aging. Values below are typical for the Permanickel 300 / UNS N03300 family and vary with exact temper and practice.
| Condition | Tensile Strength (MPa) | Tensile Strength (ksi) | Elongation (%) | Hardness |
|---|---|---|---|---|
| Annealed | 620 – 830 | 90 – 120 | 25 – 50 | Rb 90 max |
| Annealed & Aged | 1030 – 1310 | 150 – 190 | 10 – 20 | Rc 30 – 40 |
| Half Hard | 895 – 1070 | 130 – 155 | 3 – 15 | Rc 25 – 34 |
| Half Hard & Aged | 1170 – 1450 | 170 – 210 | 1 – 20 | Rc 33 – 42 |
| Spring Temper | 1030 – 1310 | 150 – 190 | 2 – 10 | Rc 30 – 40 |
| Spring Temper & Aged | 1240 – 1585 | 180 – 230 | 5 – 15 | Rc 36 – 46 |
Note: Yield strength in the spring-and-aged condition is typically about 1000–1400 MPa (145–203 ksi). For spring design, the precise temper and aging condition should be agreed and verified by material certificate.
Because it is age-hardenable, Springex 300 retains good spring properties (high elastic limit relative to UTS) and favorable fatigue life in the aged condition. It is commonly chosen where a high working stress must be sustained without permanent set. For critical cyclic-spring applications (valves, diaphragms, medical actuators), design to agreed stress levels and validate by prototype testing.
Contact Hangbo Alloy Group for certified Springex 300 / Permanickel 300 (UNS N03300) precision strip, foil, and spring wire in your required temper, with custom slitting, edging, and EN 10204 3.1 material certificates. Competitive pricing and fast worldwide delivery.
With more than 97% nickel, Springex 300 resists many service environments better than carbon and most stainless spring steels:
Hangbo Alloy Group supplies Springex 300 / Permanickel 300 (UNS N03300) in the following precision product forms:
| Product Form | Typical Size Range | Available Tempers |
|---|---|---|
| Precision Strip | Thickness 0.05 – 3.0 mm; slit width to customer spec | Annealed, Half-Hard, Spring, Spring & Aged |
| Foil / Ribbon | Thickness down to ~0.02 mm | Annealed, Spring |
| Spring Wire (round) | Diameter 0.10 – 8.0 mm | Spring, Spring & Aged |
| Flat Wire | Custom cross-sections | Spring, Spring & Aged |
All products are supplied to agreed dimensional tolerances (precision slitting and edging available) with EN 10204 Type 3.1 material certificates including chemical analysis and mechanical test results on request. Bright-annealed and skin-passed finishes are standard for strip.
| Standard | Description |
|---|---|
| UNS N03300 | Unified Numbering System designation (Permanickel 300 family) |
| ASTM F290 | Wrought Age-Hardenable Nickel Alloy for Springs and Other Applications |
| Purchaser / OEM specs | Commonly supplied to customer chemical, mechanical, and dimensional drawings |
| EN 10204 | Material certificates (Type 3.1) on request |
| AMS / ASTM equivalents | Referenced where a specific wrought nickel spring strip spec is invoked |
| Property | Springex 300 (N03300) | Ni-Span-C902 (N09902) | MP35N (R30035) |
|---|---|---|---|
| Base system | Ni (age-hardenable) | Ni-Fe-Cr (constant modulus) | Ni-Co-Cr-Mo |
| Nickel content | ≥ 97% | ~42% | 33–37% |
| Strengthening | Cold work + aging | Cold work + aging | Cold work + transformation + aging |
| Max tensile (typical) | 1240–1585 MPa | ~1310–1620 MPa | up to ~2068 MPa |
| Key advantage | High strength, low cost vs MP35N | Constant modulus vs temperature | Highest strength + best corrosion |
| Magnetic | Non-magnetic | Non-magnetic | Non-magnetic |
| Best for | General precision springs | Modulus-stable springs | Demanding medical/downhole |
Selection guide: Choose Springex 300 for high-strength, corrosion-resistant precision springs at moderate cost. Choose Ni-Span-C902 when elastic modulus must stay nearly constant with temperature (e.g., measuring instruments). Choose MP35N for the most demanding medical, marine, or downhole springs needing the highest strength and corrosion resistance.
Springex 300 is a high-strength, age-hardenable nickel-base spring alloy strip in the Permanickel 300 / UNS N03300 family. It is a high-nickel (Ni ≥ 97%) alloy strengthened by cold working plus aging, delivering excellent spring properties, good fatigue life, and corrosion resistance superior to carbon and stainless spring steels. It is supplied as precision strip, foil, and wire for medical, industrial, and electronic springs, diaphragms, and non-magnetic precision components.
Typical composition for the Permanickel 300 / UNS N03300 family: Nickel + Cobalt ≥ 97%, Carbon ≤ 0.40%, Silicon ≤ 0.35%, Manganese ≤ 0.50%, Iron ≤ 0.60%, Copper ≤ 0.25%, Magnesium 0.20-0.50%, Titanium 0.20-0.60%, Sulfur ≤ 0.010%. The titanium and magnesium additions provide age-hardening response; the very high nickel content gives the non-magnetic matrix, ductility, and corrosion resistance.
Properties depend strongly on temper and aging. In the annealed condition, tensile strength is about 620-830 MPa (90-120 ksi) with 25-50% elongation. In the spring-temper-and-aged condition, tensile strength reaches 1240-1585 MPa (180-230 ksi), elongation 5-15%, and hardness Rc 36-46. Yield strength in the aged spring temper is typically 1000-1400 MPa. Values vary with degree of cold work and aging practice.
Springex 300 is solution annealed (commonly about 1093°C / 2000°F, water quenched), cold worked to the required temper, then age hardened (typically about 16 hours at 480-490°C / 900-910°F). The combination of cold work plus aging precipitates fine Ti/Mg intermetallics and produces the high ultimate tensile strength and spring temper. Light forming should be done before aging; stress-relief after forming is performed at low temperature to avoid over-aging.
Typical physical properties: density 8.74 g/cm³ (0.316 lb/in³); melting point about 1427°C (2600°F); modulus of elasticity about 207 GPa (30 × 10³ ksi); thermal conductivity about 16 W/(m·K) at 100°C; coefficient of thermal expansion roughly 13 × 10⁻⁶ /°C (20-100°C, typical); non-magnetic in all conditions. Because it is non-magnetic and electrically conductive, it is useful for instruments and electrical-spring applications.
Yes. With more than 97% nickel, Springex 300 resists many atmospheres, fresh and salt water, alkaline and caustic solutions, and a range of organic chemicals better than carbon and most stainless spring steels. It is not intended for strongly oxidizing acids (e.g., nitric) or reducing hydrochloric/sulfuric service at elevated temperature, where Hastelloy-type alloys are preferred. Its good corrosion resistance lets springs survive in medical-implant, marine, and food-contact environments.
Primary uses are precision springs, diaphragms, and non-magnetic components where high strength and corrosion resistance are required: medical device springs and implantable components, electrical contacts and springs, relay and switch springs, instrument springs and diaphragms, marine and offshore springs, and food-processing equipment. Its combination of high strength, ductility, and corrosion resistance makes it a premium spring material.
Hangbo Alloy Group supplies Springex 300 / UNS N03300 in precision strip and foil (thickness from about 0.05 mm to 3.0 mm, slit to customer width), spring-tempered wire and flat wire, and ribbon. Strip is available in annealed, half-hard, spring, and spring-and-aged tempers, with bright-annealed or skin-passed finishes. Custom slitting, edging, and packaging are available for automated stamping and coiling.
The Permanickel 300 / UNS N03300 family is covered by ASTM F290 (Wrought Age-Hardenable Nickel Alloy for Springs and Other Applications) and the UNS N03300 designation. Related wrought/age-hardenable nickel spring strip standards and purchaser specifications are commonly applied. Hangbo supplies to agreed chemical, mechanical, and dimensional tolerances with EN 10204 3.1 material certificates on request.
Ni-Span-C902 (UNS N09902) is a constant-modulus Ni-Span-C alloy whose elastic modulus stays nearly constant with temperature and which is non-magnetic — chosen when modulus stability matters more than peak strength. MP35N (UNS R30035) is a Ni-Co-Cr-Mo alloy reaching even higher strengths (up to ~2068 MPa / 300 ksi) with excellent corrosion resistance for the most demanding medical and downhole springs. Springex 300 / Permanickel 300 offers very high strength, good corrosion resistance, and lower cost than MP35N, with simpler age-hardening than maraging-type alloys.
Springex 300 is normally used in the cold-worked and aged condition where welding is not required. Resistance welding (e.g., spot or seam welding) is suitable for assembly. Fusion welding is generally not recommended because the age-hardening chemistry and cold work are disturbed by heat, and post-weld heat treatment cannot fully restore the original spring temper. Where welded assemblies are needed, design for resistance welding or join by mechanical means.
Springex 300 springs are typically used from about -200°C to +315°C (-330°F to +600°F). Above roughly 315°C the age-hardened precipitates can coarsen (over-age) and strength declines, so continuous high-temperature spring service should stay below this limit. For higher-temperature spring service, nickel-chromium or Nimonic-type alloys are preferable.
Springex 300 / Permanickel 300 precision strip is a premium specialty alloy. Typical pricing ranges widely with thickness, temper, and certification: roughly $40-90/kg for standard strip and higher for thin foil, tight-tolerance, or aged tempers with full MTR. Lead times are typically 3-8 weeks for stock tempers and 8-14 weeks for custom slitting, aging, or certified medical-grade lots. Contact serena@hangboalloy.com for a competitive quote.
Hangbo Alloy Group is a global manufacturer and supplier of nickel-base spring alloys including Springex 300 / Permanickel 300 (UNS N03300) precision strip, foil, and wire, supplied to agreed temper and tolerances with full traceability. Request a quote at serena@hangboalloy.com or call +86 166 2109 2936 (WhatsApp available).
