Martensitic stainless steel forged piece and forging and rolling heat treatment integrated production process

Abstract

The invention relates to a martensitic stainless steel forged piece and a forging and rolling heat treatment integrated production process. The martensitic stainless steel forged piece comprises the following chemical components: 0.4-0.7% of C, 0.1-0.3% of Si, 1.6-1.8% of Mn, 0.01% of P, 0.008% of S, 0.03-0.05% of Nb, 0.02-0.06% of V, 0.006-0.015% of Ti, 0.9-1.3% of Ni, 13.3-13.6% of Cr, 0.2-0.4% of Cu, 0.4-0.6% of Mo, 0.08-0.09% of N, 0.1-0.3% of Al, 0.008-0.009% of B, 0.1-0.3% of composite rare earth and the balance of Fe. According to the martensitic stainless steel forged piece disclosed by the invention, by limiting the components and process parameters, the corrosion resistance of the stainless steel forged piece is ensured, and the corrosion resistance at the part with splashing of water drops is especially improved.

Description

technical field [0001] The invention relates to a forging and a manufacturing process, in particular to a martensitic stainless steel forging and an integrated production process of forging, rolling and heat treatment. Background technique [0002] Many stainless steel parts in steam turbines are forgings, and the forgings are required to have good corrosion resistance; in the prior art, technicians have done a lot of research on the corrosion of stainless steel forgings in steam turbines, and have taken a series of precautions Measures, such as coating protection and cathodic protection, have also achieved a lot of research results. However, due to the special working conditions of the steam turbine, the cathodic protection does not work, and the coating protection effect is not very good. Some areas of the steam turbine are affected by a series of external factors such as alternating wet and dry, water droplets, corrosive components in the atmosphere and oxygen, as well a...

AI Technical Summary

Problems solved by technology

Judging from the current technology, the tensile strength, yield strength, elongation, end face shrinkage and corrosion resistance of stainless steel forgings in steam turbines are not high, which needs to be improved

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