Method for manufacturing wind tunnel ultrahigh-pressure pipe fitting through high-nickel alloy structural steel

A technology of alloy structural steel and ultra-high pressure, applied in the direction of improving process efficiency, etc., can solve the problems of wear resistance and no adhesion of the joint surface, difficulty in meeting actual needs, difficulty in meeting needs in high grain size, etc., and achieve product quality Guaranteed, high production efficiency, and the effect of solving stress and deformation problems

Active Publication Date: 2022-02-18
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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AI Technical Summary

Problems solved by technology

The characteristics of the ultra-high pressure pipe fittings in the wind tunnel are: they are produced with pressure-bearing high-nickel steel 35CrNi3MoV or 36CrNi3MoV, and the grain size is required to be not less than grade 6, but the material contains high nickel, and the grain size is difficult to meet the needs; the yield is required to be not less than 895MPa, The tensile strength is not less than 1000MPa, but this index is too high to meet the actual needs; it is required that the finished product has no stress deformation after processing, which is a technical defect that cannot easily meet the requirements at present; it is not easy to require the technical requirements of wear resistance and no adhesion during the disassembly process satisfy

Method used

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  • Method for manufacturing wind tunnel ultrahigh-pressure pipe fitting through high-nickel alloy structural steel
  • Method for manufacturing wind tunnel ultrahigh-pressure pipe fitting through high-nickel alloy structural steel
  • Method for manufacturing wind tunnel ultrahigh-pressure pipe fitting through high-nickel alloy structural steel

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Embodiment 1

[0031] Example 1: Production of a batch of high-nickel alloy structural steel wind tunnel ultra-high pressure pipe fittings: Take the manufacture of pipe fittings with an inner diameter of φ520mm as an example, such as figure 1 As shown, the straightness of the inner hole is required to be no more than 0.1mm in length, the connecting surface is a 7° inclined plane, the length of the workpiece is 6000mm, and the material used is 35CrNi3MoV. The main requirements are that the grain size is not less than 6, the yield is not less than 960MPa, and the resistance Pull 1070-1230MPa.

[0032] Through comprehensive consideration, the actual production and manufacturing process of the pipe fittings is: electric arc furnace smelting + vacuum refining → electroslag remelting → double upsetting, elongation, forging and forming → annealing after forging → straightening → surface inspection, Cutting, physical and chemical testing (low magnification, ultrasonic flaw detection) → rough machini...

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Abstract

The invention relates to a method for manufacturing a wind tunnel ultrahigh-pressure pipe fitting through high-nickel alloy structural steel. The method comprises the following steps: smelting by using an electric arc furnace, refining in vacuum, remelting electroslag, forging and forming by using a 5000-ton oil press after heating, annealing after forging, rough machining, double normalizing and tempering, quenching, double tempering, semi-finishing and destressing tempering, finishing to the size of a finished product, laser surface quenching of a connecting contact surface, and checking. The problems of poor performance, coarse grains and unqualified finished product bending can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material product manufacturing technology, and in particular relates to a method for manufacturing wind tunnel ultra-high pressure pipe fittings from high-nickel alloy structural steel for processing large-diameter hollow pipe fittings made of 35CrNi3MoV or 36CrNi3MoV, which can effectively solve the problem of performance inconsistency, coarse grain and The problem of unqualified bending of finished products. Background technique [0002] In recent years, my country has also achieved a series of brilliant achievements in manned spaceflight and space exploration. These numerous achievements are inseparable from the large number of simulations of space vehicles using wind tunnels in the development process. Wind tunnel experimental equipment is a pipeline-like device that uses artificial methods to generate and control airflow to simulate the flow of air around aircraft or entities, measure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D1/09C21D1/18C21D8/10C22B9/18C22C33/06
CPCB23P15/00C22C33/06C21D1/18C21D1/09C22B9/18C21D8/105Y02P10/20
Inventor 周凤葆张永恒张羽范志霞宋小波靳玉生郝新辉郝飞刘东东赵东赵林伟
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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