Under the harsh test of high temperature, the disc spring of ordinary material is often difficult to withstand, once failure, it may lead to the equipment stop, production interruption, and even cause safety accidents.

As a seasoned expert in disc springs, Sunzo Spring understands that material selection in high-temperature environments directly determines the safety limits and service life of the entire fastening or cushioning system.

To help you tackle high-temperature challenges with confidence, we've carefully compiled this' High-Temperature Disc Spring Material Selection Guide 'to provide your equipment with the most reliable' High-Temperature Guardian'.

1、The Challenge of High Temperature: Why Can't It Be "Universal"?

At high temperature, the disc spring is confronted with three major "enemies":

1、Stress relaxation: This is the primary concern under high-temperature conditions. Springs become 'weakened' under sustained pressure and heat, gradually losing elasticity, which reduces preload and causes the system to loosen.

2、CREEP: Even if the force is constant, the spring will slowly deform over time, and this irreversible deformation will completely change its performance curve.

3、Oxidation and corrosion: High temperature accelerates the oxidation of the material surface, forming oxide scale, weakening the spring strength, and causing premature failure.

The core philosophy of Sunzo Spring is that there are no 'universal' materials, only solutions tailored to specific working conditions.

2、Your Working Conditions, Our Solutions: Three Masses Flexible High Temperature Material Selection Guide

Drawing on years of application data, our engineering team has developed a clear material selection pathway for you:

1、The battlefield of alloy spring steel (-50℃-120℃): a balance between reliability and economy

Top recommendations: 51CrV4, 60Si2Mn, 65Mn

Scenarios: Pre-tightening of engine exhaust pipe bolts, vibration damping for general industrial equipment in warm environments, etc.

Sunzo Spring Solution: This is one of our most widely used materials. Through precision heat treatment, it maintains stable elasticity and fatigue resistance at 120°C for extended periods, making it suitable for various high-temperature applications.

51CrV4 material disc spring product

2、Stainless Steel Battlefield (-200°C to 300°C): Performance and Stability Assurance

Top recommendations:

Ø Temperatures applicable to SUS301, SUS302, SUS304, SUS316, and SUS316L: -200°C to 200°C

Ø 17-4PH, 17-7PH, 15-7PHMo. Operating temperature: -200°C to 300°C.

Ø 

Application scenarios: Oil and gas valves, high-temperature reactors, heavy-duty diesel engines, and turbine piping systems.

The Sunzo Spring Solution: Our stainless steel disc springs are the go-to choice for high-temperature applications (200-300°C). Their core strength lies in exceptional thermal stability, delivering reliable performance for mission-critical equipment.

Stainless steel disc spring products

3、Heat-resistant/High-temperature Steel Battlefield (-200 to 700°C): The Power of Cutting-edge Materials

Top recommendations: H13 and 30W4Cr2VA. Operating temperature: -50℃ to 500℃.

Inconel 718 and Inconel X-750 are suitable for temperatures ranging from-200°C to 600°C.

Nimonic90 Operating temperature: -200℃ to 700℃

Applications: Aviation engines, gas turbines, supercritical power plant valves, and high-end scientific research equipment.

Sunzo's Elastic Solution: For high-temperature challenges exceeding 500°C, our heat-resistant/superior-grade disc springs are a standout solution. Engineered with aerospace-grade superalloys and specialized processes, these springs deliver exceptional strength and dimensional stability in extreme temperatures (550°C to 700°C), ensuring reliable system safety.

Inconel X-750 Material Disc Spring Product

3、Beyond Material: The Added Value of Three Masses Elasticity

Choose Sunzo Spring for reliable technical support. We provide not only compliant disc springs but also professional services to ensure your system runs smoothly.

1. Accurate pre-relaxation processing

In order to deal with the high temperature condition, we pre-relax the disc spring, so that most of the potential deformation is released in the initial stage, and the load is stable in the long term.

2. adaptable surface treatment

We will recommend tailored surface treatment solutions (e.g., special phosphating) based on your specific application conditions (e.g., sulfur content, vacuum environment), to enhance the product's oxidation and corrosion resistance at high temperatures.

3. Data-based Life Assessment

Based on our accumulated material property data, we can scientifically evaluate the service life of your selected disc spring under target temperature and stress conditions, providing valuable references for your maintenance planning.