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Discuss the most common uses for Spring Steel


Spring steel is popularly referred to as an annealed spring steel and “general use” steel. Spring steel is generally classified in different categories such as a low alloy, medium carbon steel or high carbon steel with a very high yield strength. Spring steel has certain properties such as it is resistant to water, environmental and pollution exposure. Stainless spring steel can essentially come under two types which is either austenitic or martensitic. The austenitic stainless spring steel strips like 301 and 302 are temper rolled for light springs versus the martensitic spring steels, such as the 420 stainless strips, that are heat treatable for high hardness and toughness and are typically used for hardened tools.

Spring steel has many applications and uses attached to it. It also has many unique properties attached to it. For example, spring steel is said to have high yielding strength and also known to be resilient. Moreover, it also has the capacity to be formed, shaped and post heat treated. It is in fact these physical characteristics that make spring steel a general use steel. Since spring steel is essentially general use steel, it has a varied amount of commercial applications. Therefore, with its common material and its properties, spring steel is used to manufacture objects such as washers, lick picks, scrapers, saw blades, springs and antennas.

One of the common uses for spring steel is that it is used to create lawn mower parts, vehicle coil springs and tubular spring is used for the landing gear of small aircrafts as it has the ability to absorb the impact of landing. Another common usage of spring steel is that they are used as piano wires, such as ASTM A228. One popular use of spring steel is that it is used for the manufacturing of metal sword which are used for stage combat due to its resistance to bending, snapping or shattering. It is also used in the fabrication of lockpicks due to its flexibility and resilience. Spring steel is also utilized in making knives, especially for the Nepalese kukri and also used to binder clips. It is also extensively used in the making of shims as it possesses the resistance to deformation in low thicknesses.

Therefore, this piece highlighted the various properties attached to spring steel and also discussed many of its applications and usages.


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ECT For Bars

Acceptance Criteria

Minimum defect depth and length (FBH)

  • 0.7 mm FBH from 15—60 mm dia
  • 1.2 mm FBH above 60 dia

Minimum defect depth and length (SDH)

  • 0.5 mm x 10 mm {from 15—120 mm dia)
  • 0.3 mm SDH sensitivity can deduced by
    extrapolation depending on material SNR.

Phased Array Auto Ultrasonic Testing Salient Features

Phased Array Technology

Phased Array testing is a specialized type of ultrasonic testing that uses sophisticated multi- element array transducers and powerful instrumentation/software to steer ultrasonic beams through the test piece and map returning echoes.

No rotating movement, only electronic scanning is done:

  • Depth focalization for bar volume inspection (LW)
  • Electronic steering for bar surface inspection (SW)

Quality Highlights:

Capacity — 15 to 120 mm dia. Full bar volume inspection

Sunflag R&D Lab Is Equipped With Following State Of The Art Equipment

  • Scanning Electron Microscope with Energy Dispersive X—Ray Spectroscope (SEM—EDS) of Make — JOEL
  • Immersion Ultrasonic Testing Facility of Make — Olympus / Blue Star
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Scanning Electron Microscope With Eds

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– Microstructure analysis
– Quantitative 8L qualitative Analysis of Inclusions

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Salient Features

Dimension of samples that can be tested :

– Round Bars :

  • Size 15-120 mm die.
  • Length 800mm
  • Round Corner Square Bars:
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UST Prob: 10 MHz — 6mm As Per Sep 1927