Springex 300: Complete Properties & Application Guide

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Overview

Springex 300 is a high-strength nickel-iron-chromium-molybdenum alloy strip specifically developed for spring applications requiring excellent corrosion resistance and high fatigue strength. The alloy maintains its spring properties at elevated temperatures up to 400°C.

Chemical Composition

The chemical composition of Springex 300 is carefully controlled to achieve its unique combination of properties and performance characteristics.

Element	Min %	Max %
Nickel (Ni)	35.0	38.0
Iron (Fe)	Balance	Balance
Chromium (Cr)	15.0	17.0
Molybdenum (Mo)	6.0	8.0
Cobalt (Co)	—	2.0
Carbon (C)	—	0.06
Manganese (Mn)	—	1.0
Titanium (Ti)	—	0.50

Mechanical Properties at Room Temperature

The mechanical properties of Springex 300 vary depending on product form and heat treatment condition. The data below represents typical values for solution-annealed material.

Property	Value
Tensile Strength	1400 MPa
Yield Strength (0.2% offset)	1100 MPa
Elongation in 2 inches	12%
Density	8.20 g/cm3
Melting Point	1390 °C
Max Service Temperature	400 °C

Corrosion Resistance

Good resistance to atmospheric corrosion and mild chemical environments. The chromium and molybdenum content provides moderate resistance to pitting and crevice corrosion. Suitable for applications in marine and industrial atmospheres.

Applications

The unique combination of properties makes Springex 300 suitable for a wide range of demanding applications:

• Spring Manufacturing: High-performance springs for aerospace and industrial applications.
• Electronics: Battery contacts, switch components, and connectors.
• Automotive: Valve springs, clutch springs, and safety belt retractors.
• Medical: Surgical instrument springs and orthodontic components.
• Industrial: Valve plates, diaphragms, and pressure-sensing elements.

Available Product Forms

Hangbo Alloy Group manufactures and supplies Springex 300 in the following product forms, conforming to ASTM, AMS, and ASME specifications:

• Round Bars: Diameters from 6 mm to 300 mm, hot-finished or cold-drawn, solution annealed.
• Seamless Tubes & Pipes: Sizes from 6 mm OD to 219 mm OD, various wall thicknesses.
• Plates & Sheets: Thicknesses from 0.5 mm to 50 mm, hot-rolled or cold-rolled.
• Forgings: Custom flanges, rings, discs, and complex shapes per customer drawing.
• Welding Wire: Diameters 0.8 mm to 5.0 mm, precision-wound coils and spools.

Related Standards

Standard	Description
ASTM A313	Stainless Spring Wire
AMS 5512	Strip
DIN 17224	Spring Steel
JIS G4314	Japanese Standard
SAE AMS 5512	Aerospace Material
ISO 6931-1	Spring Strip

Contact Us for Springex 300

Hangbo Alloy Group maintains extensive inventory of Springex 300 in all standard product forms. We can provide mill test certificates, third-party inspection reports (SGS, TUV), and custom processing services.

For quotations, material certifications, or technical consultation, contact our sales team or call +86-136-1165-6360. We typically respond within 10 minutes.