Five causes of cracks in S420ML carbon steel plate sheet during quenching

S460Q plate is a structural steel with high yield strength under quenched and tempered conditions. It is a special alloy steel. S460Q executive standard: EN10025-6, stipulates that the nominal thickness of S460 grade steel is 3-150mm, and the yield strength that can be achieved after quenching and tempering is greater than 460MPa, steel number: 1.8908. S420ML carbon steel plate sheet, S460Q steel must be completely killed, there should be fine grain structure and sufficient nitrogen fixing elements in the steel.

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The production method of seamless steel pipe can be roughly divided into cross rolling method (menesmann method) and extrusion method. The cross rolling method (menesmann method) is to pierce the tube blank with the cross roll first, and then extend it with the rolling mill. This method is fast in production, but requires high machinability of tube blank. It is mainly suitable for producing carbon steel and low alloy steel tube, S420ML carbon steel plate sheet tube.