Processing technology of high temperature and high pressure resistant forgings for steam turbine

Abstract

The invention provides a machining process of a high-temperature and high-pressure resistant forging for a steam turbine. The machining process comprises the steps of blanking, removal of uneven structures at the end parts of phi round steel and sawing, wherein the forging comprises the following components in percentage by weight: 0.10-0.20% of C, 12.0-16.0% of Cr, 1.00-2.00% of Si, 21.0-25.0% ofMn, P not more than 0.025%, S not more than 0.020%, 1.0-1.20% of Mo, 0.05-0.10% of Ni, 0.50-1.00% of Cu, 0.25-0.35% of V, 0.03-0.10% of Re, 1.00-2.00% of Al, W not more than 0.60%, 0.02-0.05% of Nb,80-180 PPm of N, and the balance of Fe and inevitable impurities. More Cr and less Ni are adopted, so that the use level of Ni is greatly reduced, the production cost is greatly reduced, and the mechanical performances of products in three directions can be met.

Description

technical field [0001] The invention relates to a processing technology of a high temperature and high pressure resistant forging for a steam turbine. Background technique [0002] In the prior art, the high temperature resistant forgings for steam turbines are mainly composed of C: 0.18-0.24%, Si: 0.10-0.50%, Mn: 0.30-0.80%, P: ≤0.025%, S: ≤0.020%, Cr: 11.00- 12.5%, Mo: 0.80-1.20%, Ni: 0.30-0.80%, V: 0.25-0.35%, W ≤0.60%, the existing ingredients cannot meet the mechanical properties of the product in three directions. High-temperature forgings, this type of steel material has high high-temperature hardness and poor forgeability. The forging temperature range is as small as 1150-950°C, and the forging is easy to crack. [0003] In addition, as society's demand for austenitic stainless steel is increasing day by day, people prefer Ni-containing austenitic stainless steel; however, the earth's nickel resources for the manufacture of austenitic stainless steel are limited, a...