Carbon Steel

Structural & general engineering. 4 grades with composition, properties and applications.

Structural

Q235

China's standard structural carbon steel — the general-purpose Q235 for framing, plate and general engineering.

Q345

China's workhorse low-alloy high-strength structural steel — Mn + micro-alloying deliver ~345 MPa yield for bridges, buildings and heavy machinery.

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Medium Carbon

45#

China's default quench-and-temper machine steel — 45# balances strength and toughness after heat treatment for shafts, gears and general machine parts.

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Low Carbon

20#

Chinese GB quality low-carbon steel — excellent weldability and cold formability, widely carburized for wear surfaces and used for seamless pressure/boiler tubes.

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