The neighboring section of the gas-cut surface of a steel plate sometimes becomes harder than the other sections due to the quenching effect. The greater the carbon equivalent, the greater the hardenability as is the case with high tensile strength steel plates and atmospheric corrosion-resistant steel plates.
Some examples of NSSMC's examination results on hardening due to gas cutting are shown below. It is understood that the hardened section is at most within 3mm from the cut face. Such hardening does not matter in regular bending or cutting work. The thick steel plates manufactured by our company have good workability, so the harmful effects caused by gas cutting are minimal and the plates can be used with peace of mind. If heating is conducted before or after the gas cutting, to soften the plates, the
workability and cutability are further improved.
Results of hardenability tests of WEL-TEN590 steel plates by gas cutting （plate thickness=25mm）
Results of hardenability tests of WEL-TEN590 steel plates by gas cutting （plate thickness=32mm）
Source: www.nssmc.com
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