Exotic alloys - Lee Spring explain what they are and when to use them
Super alloy springs can be used in a number of severe conditions including extreme high or low temperatures, great pressure and facing outdoor conditions, including extreme weather. Springs not made from super alloys, if used in these circumstances, are at risk of becoming deformed or damaged, as they will not be strong enough to withstand heavy impact or harsh conditions.
“The reliability of the finished product in its application hinges on the correct material selection to meet the specific application requirements” says Darren Eyre, Technical Specialist at Lee Spring. “Stainless steel, for example, is tough and corrosion resistant, but it does not offer the properties that are required in order to withstand extreme heat, so is likely to distort when exposed to high temperatures. It is essential to clearly understand the environment that the spring is likely to be used in.”
“Springs required to operate in harsh environments could mean anything from underwater, contending with corrosion from saltwater, or contact with ‘sour’ gas from drilling down under the sea bed, to 35,000 feet up in the air battling low temperatures and high wind speeds” says Barry Steele, Applications Engineer at global spring company, Lee Spring. “Offshore applications require equipment that is capable of ‘braving the elements’, and some manufacturing or furnace applications involve extreme high or low temperatures. Some applications will involve the equipment being subjected to highly corrosive substances.”
A good example is the nickel-cobalt alloy, MP35N which consists of nickel and cobalt and is ideally suited to marine and sub-sea applications due to its resistance to hydrogen sulphide, salt water and mineral acids, which can have a highly corrosive effect on most metals. Monel is a nickel based alloy that incorporates copper and iron. It is corrosion resistant and acid resistant, so is suitable for marine applications as well as applications involving acids and other highly corrosive substances.
Many and varied specific characteristics dependant on the actual alloy chosen, e.g. Ni Ti nickel-titanium springs exhibit super elasticity which can be useful in orthodontic applications.
Titanium alloy springs are widely used in off-road bicycles also F1, WRC rally and Touring/GT, in fact pretty much all levels of high-performance competition where weight and performance are critical.
Inconel alloys are available in different grades (600, X-750 and 718) and are suitable in valves, pumps or actuators, for applications that involve high pressure and high temperatures, for example in nuclear power stations or for drilling on offshore platforms. Nimonic and Hastelloy alloys are also corrosion resistant and are suitable for applications involving high pressure and high temperature.
Other nuanced alloy configurations are often used where more cost-conscious alternatives are desired without the absolute ultimate performance demand. It is essential to clearly understand the environment that the spring is likely to be used in and usually to consult the materials specialists at your spring manufacturer.”
Further information on Lee Spring products can be found on their website - www.leespring.co.uk or by following them on Twitter - https://twitter.com/leespringuk.
Lee Spring Ltd
Tel: 0118 978 1800
Press contact: Christopher Petts
Lee Spring is the UK supplier of choice for catalogued and custom springs, including compression springs, torsion springs, constant force springs, die springs, belleville spring washers, wave springs, extension springs, battery springs and numerous speciality springs. Materials include steel, stainless steel, cobalt/nickel alloy, bronze, brass, music wire and composite plastics.
In addition, Lee Spring offer extensive custom design and manufacture services for one-off/prototypes or ongoing production requirements.
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