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Low-alloy high-strength cast steel, and smelting and heat treatment method thereof

A low-alloy high-strength, smelting method technology, applied in the field of low-alloy cast steel, can solve the problems such as the inability to meet the manufacturing requirements of large-scale steel castings for wind power, the complex heat treatment process, the difficulty of industrial smelting control, etc., and the tendency to shrink porosity is not obvious. , Excellent casting process performance, convenient for industrial application

Active Publication Date: 2013-03-13
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the cast steel requires strict control of impurity elements sulfur and phosphorus, requiring the total content of sulfur and phosphorus to be less than or equal to 0.025%, which brings great difficulty to industrial smelting control, and requires the use of electric furnace + AOD refining furnace dual process smelting, The scope of industrial application is relatively narrow; therefore, the smelting process of the cast steel is complicated, and the subsequent heat treatment process is also relatively complicated and cumbersome, which cannot meet the manufacturing requirements of large wind power castings

Method used

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  • Low-alloy high-strength cast steel, and smelting and heat treatment method thereof
  • Low-alloy high-strength cast steel, and smelting and heat treatment method thereof
  • Low-alloy high-strength cast steel, and smelting and heat treatment method thereof

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Embodiment 1）

[0048] The chemical composition (mass percentage) of the low alloy cast steel of this embodiment is: carbon 0.18%, silicon 0.33%, manganese 0.94%, phosphorus 0.012%, sulfur 0.013%, nickel 0.48%, chromium 0.68%, molybdenum 0.53% , copper 0.10%, the rest is iron and unavoidable impurities, the impurity content is less than 0.1%.

[0049] The low-alloy cast steel in this embodiment can be smelted by an electric arc furnace oxidation-reduction method, or can be smelted by an intermediate frequency induction furnace.

[0050] The following steps are involved in the steelmaking by the electric arc furnace redox method:

[0051] ① Loading, after cleaning and derusting the discarded carbon steel, put it into the furnace body of the electric arc furnace at the same time as metal nickel.

[0052] ② Oxidation, turn on the corresponding electrical switches, and when the temperature of the molten pool in the electric arc furnace reaches 1560 ° C ~ 1580 ° C (1560 ° C in this embodiment), a...

Embodiment 2 to Embodiment 12）

[0082] The chemical compositions of the low-alloy cast steels of Examples 2 to 12 are shown in Table 1, and the unavoidable impurity content in the low-alloy cast steels of each embodiment is lower than 0.10%:

[0083] Table 1 Chemical composition (wt%), the rest is iron and unavoidable impurities

[0084]

[0085] The smelting method of the low-alloy cast steel in the above examples 2 to 12 is the same as the smelting method adopted in the example 1. During smelting, the tapping temperature is controlled above 1620°C, and the pouring temperature is controlled at 1550°C-1570°C.

[0086] The heat treatment method of the low-alloy cast steel in the above embodiments 2 to 12 is the same as the heat treatment process of the embodiment 1.

[0087] The mechanical property detection data of the samples of 330mm (length) × 80mm (width) × 80mm (height) poured and heat-treated from Example 1 to Example 12 are shown in Table 2 below (Rm in Table 2 is the tensile strength, Rp0.2 Yield...

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Abstract

The invention discloses low-alloy high-strength cast steel, and a smelting and heat treatment method thereof. The cast steel comprises the following chemical components in percentage by weight: 0.17-0.22% of carbon, 0.20-0.60% of silicon, 0.80-1.20% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.015% of sulfur, 0.45-1.05% of chromium, 0.4-0.9% of nickel, 0.4-0.95% of molybdenum and less than or equal to 0.30% of copper, and the balance of iron and inevitable impurities. An electric arc furnace oxidation-reduction method or a medium-frequency induction furnace is used for smelting. After a wind power planet carrier casting poured by the low-alloy cast steel disclosed by the invention is heated, the mechanical properties can be stably achieved, the strength of extension is greater than or equal to 830Mpa, the yield strength is greater than or equal to 790MPa, the extension rate is greater than or equal to 12%, and the impact absorption power with a lower temperature of minus 40 DEG C is greater than or equal to 27J.

Description

technical field [0001] The invention relates to a low-alloy cast steel, in particular to a low-alloy high-strength cast steel suitable for large pressure-bearing parts in wind power generation equipment and its smelting and heat treatment methods. Background technique [0002] With the increasing pressure of the global energy crisis and ecological environment crisis, it is the general trend for new energy to replace traditional petrochemical energy. As a renewable clean energy with the most development and utilization prospects and the most mature technology, wind energy has been paid more and more attention. my country has a vast territory and abundant wind resources. According to the data of the National Meteorological Administration, the total amount of exploitable wind resources in China is 1 billion kilowatts, of which nearly 300 million kilowatts are on land and 700 million kilowatts are at sea. Xinjiang, Inner Mongolia, Northeast China and the coastal areas are all r...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21C5/52C21D1/28C21D1/25
Inventor 朱正锋徐海波张保松
Owner CRRC QISHUYAN INSTITUTE CO LTD
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