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Machining method of high-temperature-resistant annular part for steam turbine

A processing method and high-temperature-resistant technology, which is applied in metal material coating technology, coating, solid-state diffusion coating, etc., can solve the problems of unsatisfactory mechanical properties of products, small forging temperature range, easy cracking of forging, etc., to reduce the gap Sensitivity, improvement of hardness, effect of high surface hardness

Inactive Publication Date: 2020-01-14
JIANGYIN HENGRUN HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 composition cannot meet the mechanical properties of the product in three directions. In addition, the existing high-temperature-resistant forgings for steam turbines have high-temperature hardness and poor forgeability.
Forging temperature range is small 1150-950 ℃, forging is easy to crack

Method used

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Embodiment Construction

[0016] The specific implementation of the present invention will be further described below in conjunction with the examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0017] A method for processing high-temperature-resistant rings for steam turbines, S1: electric furnace smelting blanks, the blanks include the following chemical components in terms of mass percentages: carbon: 0.20-0.25%, manganese: 1.20-1.50%, chromium: 12.00-14.0%, nickel : 0.30-0.80%, phosphorus ≤ 0.025%, sulfur ≤ 0.015%, silicon: 0.20-0.50%, molybdenum: 0.9-1.25%, vanadium: 0.20-0.30%, rhenium: 0.05-1.3%, tin ≤ 0.02%, aluminum ≤0.025%, copper ≤0.15%, cobalt, 0.15-0.20%, titanium ≤0.025%, the rest is Fe and unavoidable impurities;

[0018] S2: Heating before forging, put the billet into a natural gas heating furnace for heating, the furnace temperature should be less tha...

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Abstract

The invention discloses a machining method of a high-temperature-resistant annular part for a steam turbine. The method includes the following steps that a blank is smelted in an electric furnace, andthe blank includes the following mechanical components of, by mass, 0.20-0.25% of carbon, 1.20-1.50% of manganese, 12.00-14.0% of chromium, 0.30-0.80% of nickel, 0-0.025% of phosphorus, 0-0.015% of sulphur, 0.20-0.50% of silicon, 0.9-1.25% of molybdenum, 0.20-0.30% of vanadium, 0.05-1.3% of rhenium, 0-0.02% of tin, 0-0.025% of aluminum, 0-0.15% of copper, 0.15-0.20% of cobalt, 0-0.025% of titanium, and the balance Fe and unavoidable impurities. Original tungsten is replaced by rhenium, the high temperature resistance is guaranteed, meanwhile the stiffness is improved, the effects of the corrosion resistance and the abrasion resistance are improved, and thus the contents of C and nickel can be reduced.

Description

technical field [0001] The invention relates to a processing method of a high temperature resistant ring 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 composition cannot meet the mechanical properties of the product in three directions. In addition, the existing high-temperature-resistant forgings for steam turbines have high-temperature hardness and poor forgeability. The forging temperature range is small 1150-950 ℃, and the forging is easy to crack. Contents of the invention [0003] The object of the present invention is to overcome the defects in the prior art and provide a processing method for high temperature resistant rings for steam turbines. [0004] In order to achieve the above object, the techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/04C22C38/02C22C38/44C22C38/46C22C38/42C22C38/52C22C38/50C23C8/38
CPCB23P15/00C22C38/002C22C38/008C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/50C22C38/52C23C8/38
Inventor 承立新沈忠协顾明浩赵周力吴斌卞磊何中波
Owner JIANGYIN HENGRUN HEAVY IND