Features of siliconizing of pipe steel X12CrNi25-20 with various term of operation in the conditions of the reactionary furnace

Abstract Most refinery and petrochemical reaction furnaces are operated under harsh conditions characterized by high pressures, temperature, aggressiveness of the process environment. The temperature features heated raw material contribute to formation deposition coke on surface furnace pipes, which through adhesion diffusion phenomena has a negative effect reduces operational reliability entire furnace, causing such phenomenon as carburization metal. Carburization contributes significant limitation ductility metal increases brittleness, leads various unacceptable defects, in particular brittle cracks. occurrence defects this type inevitably depressurization coil and, result, emergency situations shutdown for repair. problem carburizing can help solve silicization its layers, since silicon serve an effective protection active saturation with carbon. In regard, relevant topic is study modified silicon-based layer tubes steel X12CrNi25-20 different operating life order increase during operation.