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Manufacturing process of low-alloy high-strength structural steel bearing seat for nuclear power

A low-alloy, high-strength, manufacturing process technology, applied in the field of forging plate-shaped forgings, can solve the problem that the bearing seat cannot meet the technical requirements for nuclear power, and achieve the effects of improving thermal processing performance, increasing the forging ratio, and uniform deformation of the blank

Active Publication Date: 2019-06-28
ZHANGJIAGANG HAILU ANNULAR FORGINGS
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Problems solved by technology

However, the existing bearing seat manufacturing process can not meet the technical requirements for nuclear power

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  • Manufacturing process of low-alloy high-strength structural steel bearing seat for nuclear power

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0015] The manufacturing process of low-alloy high-strength structural steel bearing housings for nuclear power, the process steps are as follows: blanking→furnace heating→forging→rough turning→UT flaw detection→quenching and tempering heat treatment→finish turning processing;

[0016] (1) In the blanking process: purchase steel ingots with the steel number 1813FD1, and then re-smelt the steel ingots using the smelting method of alkaline electric furnace + electroslag remelting to obtain forging steel. The chemical composition requirements of forging steel are as follows: C: 0.13 ~0.2%, Si: 0.2~0.6%, Mn: 1.2~1.6%, P: ≤0.030%, S: ≤0.02%, Cr: ≤0.03%, Ni: ≤0.03%, Cu: ≤0.25%, balance Fe; the mechanical properties of forging steel must meet the following requirements: Rm (MPa): 450-600, Rp (MPa) ≥ 275, A (%) ≥ 20, Z (%) ≥ 31, HB: 121-178; The...

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Abstract

The invention discloses a manufacturing process of a low-alloy high-strength structural steel bearing seat for nuclear power. The process comprises the following steps of blanking, furnace charging and heating, forging, rough turning, UT flaw detecting, quenching and tempering heat treatment, and finish turning. The content of Mn in steel adopted is increased in the manufacturing process, so thatthe toughness, strength, hardness and wear resistance of the steel for forging are improved, and meanwhile, the hardenability and the thermal machining performance of the steel are improved, so that the bearing seat manufactured can meet the technical requirements of the nuclear power; the technology of multi-direction repeated pier roughing is adopted during forging, so that the deformation of ablank is uniform in the whole forging process, and an effective forging section area and a forging ratio are improved, and thus the bearing seat obtained has better mechanical properties; and meanwhile, the whole shape and size of the forging is close to a finished product by punching half holes to avoid waste of raw materials.

Description

technical field [0001] The invention relates to the field of forging plate-shaped forgings, in particular to a manufacturing process of a low-alloy high-strength structural steel bearing seat for nuclear power. Background technique [0002] As the outer support point of the bearing, the bearing seat supports the weight of the entire rotor and the radial force when the rotor rotates, and provides lubricating and cooling conditions for the bearing at the same time. Abrasion is the most common problem of bearing housings. Most bearing housings in nuclear power units work in an environment higher than room temperature. Therefore, nuclear power bearing housings must not only consider the size and hardness requirements at room temperature, but also consider the wear and tear caused by the high-speed movement of the unit. performance and shape requirements. Therefore, nuclear power bearing housings require high strength, high low temperature performance and high temperature perfor...

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Application Information

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IPC IPC(8): C22C38/58C22C38/42C22C38/04C22C38/02C21D1/18B21J5/00
Inventor 陈艺杰徐峰张斌顾晓燕张洪浚薛丽丽
Owner ZHANGJIAGANG HAILU ANNULAR FORGINGS