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Maximum hardness and carbon equivalent - CARBON-EQUIVALENT=MA

Author: hirocherry7312Executions: 284
TOP/Shared Formulas (Engineering)/Civil & Mechanical

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The maximum hardness near the welded joint of steel has a linear relationship with the carbon equivalent of the steel.
[110,325] CARBON-EQUIVALENT = MAXIMUM-HARDNESS
Hvmax = 1,200 × Ceq – 200 --- For fillet welds with a plate thickness of 12 mm
If Hvmax ≤ 350, no cracks will form. When Hvmax = 250, the ductility of the heat-affected zone is good.Initial values: SM570 C (0.16% < 0.18%), Mn (1.56% < 1.70%), Si (0.38% < 0.55%) → Ceq = 0.44%
Ceq
％
Hv 
The SM570 (JIS G 3106) specifies, in addition to Ceq (≤ 0.44%), Hv (10 kg) ≤ 350 and a bead bend test.

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