Heat resistance of springs｜Comprehensive manufacturer of springs

Heat resistance of spring

There is no clear standard for the heat resistance temperature of springs. The heat resistance temperature of springs is only an approximate heat resistance temperature calculated based on various experimental data. The conditions of use (dynamic or static use) and the corrosive environment, such as whether the environment in which the spring is used are acidic or alkaline, also affect heat resistance.

Please consider the heat resistance temperature used as a spring only as a guideline. As related standards, the Japan Spring Industry Association has issued standards for design standards and heat resistance evaluation methods for heat-resistant compression coil springs as industry standards.

Guideline for spring heat resistance

This is a guideline for the heat resistance of springs.

　Hard steel wire/Piano wire 150 degrees

　Oil tempered wire 240 degrees

　Stainless steel wire SUS304-WPB 290 degrees

　Stainless steel wire SUS631J1-WPC 340 degrees

　Inconel 600 350 degrees

　Inconel X-750 650 degrees

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Heat resistance temperature of hard steel wire and piano wire

Generally, it is said that it should be used at a temperature of 150 degrees or less.
Piano wire is better for dynamic use, and hard steel wire is better for static use.

Regarding the cold resistance temperature, an example of use of minus 40 degrees has been reported.

Heat resistant temperature of oil tempered wire

If the piano wire is weakened or broken, use oil-tempered wire.
In particular, silicon chromium steel oil-tempered wire has better heat resistance than piano wire. Above 250 degrees, stainless steel wire seems to have better heat resistance.

Heat resistant temperature of stainless steel wire

Stainless steel wire SUS304-WPB is used as a general heat-resistant spring. However, compared to silicon chromium steel oil-tempered wire, fatigue strength and tensile strength are inferior.

SUS631J1-WPC is a Japanese original standard. The heat resistance temperature is said to be up to 350 degrees at the highest. SUS631J1-WPC has strong magnetism.

Also, the heat resistance temperature of SUS316-WPA, which has little magnetism, is 290 degrees, which is the same as SUS304-WPB.

Inconel heat resistant temperature

Inconel is a registered trademark of Special Metals (formerly Inco, an acronym for International Nickel Company). Inconel is a nickel-based alloy.

There are various types, but more than 70% of Inconel 600 and Inconel X-750 are made of nickel.

Inconel 600

Inconel 600 is the standard material for use in high temperature, highly corrosive environments. It is said to be resistant to oxidation even at 1000 degrees. However, when used as a spring, the usable temperature is up to about 350 degrees.

Inconel X-750

Inconel X-750 is a material with properties suitable as a spring material. When used as a spring, it is heat resistant up to approximately 650 degrees. In addition, it is said that it maintains good properties even in an environment of minus 250 degrees.

> JIS standards for spring materials

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