B35A550

Other

B35A550

Electrical / silicon steel B35A550.

Chemical Composition (%)

SI0.5
C0.005
AL0.5
MN0.3

Mechanical Properties

Core loss: low; Flux density: high

Equivalent Standards

Electrical B35A550

Equivalent Grades

IEC

Applications

Transformers, motors, relays

Available Forms

Sheet

Uses

Spring steel with high elastic limit and fatigue strength for coils, leaf springs, clips and suspension parts. Silicon (≈2%) raises elastic limit and tempering resistance. Supplied as strip, wire and bar; shot-peened after forming for longer service life.

Heat Treatment

Austenitize 830–880 °C (oil quench) and temper at 400–520 °C; stress-relieve formed springs at 230–320 °C after coiling.

Precautions

Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating). Shot-peen after coiling to improve fatigue life; avoid sharp bends and surface defects.

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