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Manufacturing method of seamless steel pipe for aerospace

A technology for aerospace and seamless steel pipes is applied in the production field of aerospace accessories, which can solve the problem of high cost of seamless steel pipes for aerospace, and achieve the effects of facilitating production, improving market competitiveness, and facilitating dimensional accuracy control.

Active Publication Date: 2019-02-15
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for manufacturing seamless steel pipes for aerospace, aiming to solve the problem of high cost of manufacturing seamless steel pipes for aerospace in existing production methods

Method used

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  • Manufacturing method of seamless steel pipe for aerospace
  • Manufacturing method of seamless steel pipe for aerospace
  • Manufacturing method of seamless steel pipe for aerospace

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Embodiment

[0037] Adopting the method of the present invention to produce and manufacture seamless steel pipes for aerospace use requires a manufacturing specification of Ф127*19, and selects a steel material with a steel grade of 30CrMnSiA for manufacture. The weight percentage of each chemical composition in 30CrMnSiA steel is: C 0.28%~0.34%, Si 0.90%~1.20%, Mn 0.80%~1.10%, Cr 0.80%~1.10%, Mo≤0.15%, Ni≤0.30%, W ≤0.20%, V≤0.03%, Ti≤0.03%, P≤0.020%, S≤0.015%, Cu≤0.20%, the balance is iron and impurities.

[0038] The specific manufacturing method is as follows:

[0039] In the billet making step, scrap steel and pig iron are selected as the main raw materials, and other raw materials are obtained according to the above weight percentages, and then the raw materials are sequentially smelted in an electric furnace, refined in a LF furnace, refined in a VD furnace, continuous casting and electroslag remelting to make a billet. It is a Φ350mm ingot shape; finally, the prepared steel billet ...

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Abstract

The invention belongs to the technical field of production of aerospace accessories and particularly discloses a manufacturing method for a seamless steel pipe for aerospace. The problem that manufacturing of a seamless steel pipe for aerospace through an existing production method is high in cost is solved. The manufacturing method for the seamless steel pipe for aerospace comprises the steps of steel billet making, rolling, hot sizing, stretch reducing and annealing. According to the manufacturing method, the seamless steel pipe for aerospace is manufactured through steel billet making, rolling, hot sizing, stretch reducing, annealing and other process steps, the electroslag scaling billet forging step is canceled, a steel billet is directly rolled by a pilgrim rolling unit to obtain an initial-pass pipe billet, then a finished pipe with the corresponding specifications is obtained through a twice-sizing mode, on the premise that the effect that the product size and performance meet requirements is ensured, the production cost of per ton of pipes is lowered by about 9%, thus the products have larger economic actual effects, and market competitiveness of the products is improved.

Description

technical field [0001] The invention belongs to the production technical field of aerospace accessories, and in particular relates to a manufacturing method of seamless steel pipes for aerospace. Background technique [0002] As the development of the aerospace industry enters a new stage, high-level or ultra-high-level aerospace activities are more frequent, and the development of aerospace technology greatly leads and promotes the development of aerospace materials, pushing aerospace materials towards higher quality. High-end, newer categories, stronger functions and more economical and effective direction. 30CrMnSiA is a typical Cr-Mn-Si system medium carbon quenched and tempered steel, which is characterized by high specific strength and high hardness. Important parts with medium cross-sections under load, such as aircraft landing gear, engine mounts, wing girders, spar joints, seamless steel pipes, etc., are currently the most widely used steels in aircraft structures....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 白青青
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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