Steel Quench Lab

Bar

At heat

Temperature830°CIn the forge, soaked

ColourBright cherry

MagnetDoesn't stick

Steel

Entry tilt0°

Tilt is the angle the bar enters the bath: 0° flat, 90° end first. Flat entries bow the bar.

Heat to830 °C

Changing the steel or the temperature starts a fresh bar.

Quench rate at 700 °C

Water850 °C/s Oil100 °C/s Air11 °C/s Furnace0.03 °C/s

Inside

Austenite

FeC

Austenite grains

Ready to quench

Cooling path

CCT, simplified

Bar temperature over time, coloured by quench A₁ 727 °C, austenite forms above Pearlite starts forming Pearlite complete Pearlite region: enter it and the bar stays soft Mₛ 220 °C, martensite forms below Where a run enters pearlite

Runs

Quench	Steel	From	Structure	HRC

Result

Bar is hot

—HRC

File: —
Toughness: —
Crack risk: —
Bow: —