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The basic requirement which is placed in front of modern thermal power plants is higher degree of utilization rates. As one of possible way of fulfilling the requirement is to increase steam parameters, which is conditioned by application of materials suitable for work on default temperatures and pressures. Materials used in steam boiler production must fulfill quality requirements, which are defined according to terms of exploitation which will be exposed during his lifespan, but also should be appropriate for the manufacturing process. At the same time, with the development of of boiler power plants, development of materials to be installed in boilers has run also. As one of significant representative of materials in boiler power production is also heat resistant low alloy steel 13CrMo4 - 5. Aim of this paper was to present and analyze main causes which led to the occurence and propagation of crack on bottom header front wall of crack. After conducted experiments type of cracks is determined, and after detailed analysis causes of cracks.