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Service life and flaw detection standard of cold-rolled work rolls and cold-rolled intermediate rolls


The main links in the manufacturing process of cold-rolled work rolls and cold-rolled intermediate rolls are smelting, forging, heat treatment, processing and inspection.

Cold-rolled work rolls and cold-rolled intermediate rolls have to bear a lot of rolling stress during the working process. In addition, problems such as welds, inclusions, and edge cracks in the rolled piece can easily lead to instantaneous high temperatures, which make the work rolls subject to strong thermal shocks. Cause cracks, sticking, peeling and even scrapping. Therefore, cold-rolled work rolls and cold-rolled intermediate rolls must have the ability to resist cracking and spalling caused by bending stress, torsional stress, and shear stress, and also have high wear resistance, high contact fatigue strength, and high Fracture toughness and thermal shock strength, etc. Therefore, how to improve the service life of the roll has always been a major problem faced by the roll manufacturing industry.

Non-destructive testing of rolls is usually carried out with ultrasonic flaw detectors. In the flaw detection standards of cold-rolled work rolls and cold-rolled intermediate rolls, the roll body is usually divided into a surface area, a central area and an intermediate area according to the stress, and then the critical size of the allowable defects in each area is specified according to the principle of fracture mechanics. Flaw detectors should have knowledge of roll manufacturing in order to determine the nature of defects, and should also have knowledge of roll use in order to estimate whether these defects may cause service damage under specific conditions of use.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_btn title=”About LMM GROUP” link=”|target:_blank”][vc_column_text css=”.vc_custom_1649296177864{margin-top: 50px !important;}”]friendship Link:

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As professional one-stop solution provider, LIAONING MINERAL & METALLURGY GROUP CO., LTD(LMM GROUP) Established in 2007, and focus on engineering research & design, production & delivery, technology transfer, installation & commissioning, construction & building, operation & management for iron, steel & metallurgical industries globally. 

Our product  have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, EZZ steel etc. We do OEM for Concast and Danieli for a long time.

LMM Main product series

Core technology products:

  • magnesia carbon brick
  • slide gate plate
  • graphite electrode

Core technology products:

  • Hss roller
  • cast steel rolls
  • tungten carbide ring roller

Core technology products:

  • copper mould tube
  • copper mould plate
  • assembly & cooling jackts

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