Help analyze the causes of cracks in 36 thick 410ss steel plates
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The material is 410ss and the plate thickness is 36mm. The steel plate is drilled first, then rolled, and then welded. The manufacturer produced cracks during the manufacturing process. Please help analyze the cause.
Material is not up to standard? Is this kind of material not suitable for this kind of processing?
There is a material called 410S, but I have never heard of 410SS. I am ignorant. 410S martensitic stainless steel, American ASTM standard martensitic stainless steel, the corrosion resistance comes from "chromium", which ranges from 11.5 to 18%. Steel with higher chromium content needs higher carbon content to ensure the formation of martensite during heat treatment. The improvement of standard martensitic steel contains added elements such as nickel, molybdenum, vanadium, etc., which are mainly used to increase the limited allowable operating temperature of standard steel to above 1100K. When these elements are added, the carbon content also increases. As the carbon content increases, the problem of avoiding cracks in the hardened heat-affected zone of the weld becomes more serious. Martensitic stainless steel can be welded in the state of annealing, hardening, hardening and tempering. Regardless of the original state of the steel, a hardened martensitic zone will be produced near the weld bead after welding. The hardness of the heat-affected zone mainly depends on the carbon content of the base metal. When the hardness increases, the toughness decreases, and this area becomes more prone to cracks. Preheating and controlling the interlayer temperature are the most effective ways to avoid cracks. In order to obtain the best properties, post-weld heat treatment is required.
solution: It is recommended to find the supplier to raise quality objections and ask them to coordinate with the steel plant's technical department for after-sales processing.
The material is 410S. Thank you for your reply. The supplier took samples for performance testing. Not only were there cracks in the heat affected zone of the weld, but also many small cracks were found on the end face of the plate after the roll. I would also like to ask if 304H can be used instead when the design temperature is 860°C.
For high temperature corrosion protection, 321H can be used
For raw material issues, it is recommended to negotiate with the supplier!