CN-122007817-A - Preparation method of high corrosion-resistant alloy cylinder body for hydraulic support and corrosion-resistant alloy material

CN122007817ACN 122007817 ACN122007817 ACN 122007817ACN-122007817-A

Abstract

The invention provides a preparation method of a high corrosion resistant alloy cylinder body for a hydraulic support and a corrosion resistant alloy material, which comprise the steps of providing the corrosion resistant alloy material, processing the quenched and tempered corrosion resistant alloy material into a cylinder bottom according to a cylinder bottom processing procedure, processing the quenched and tempered corrosion resistant alloy material into a cylinder barrel according to a cylinder barrel processing procedure, respectively processing grooves on the cylinder bottom and the cylinder barrel, welding the cylinder bottom on the cylinder barrel, and welding a lower cavity joint seat on the cylinder bottom, wherein when the cylinder bottom is welded on the cylinder barrel, welding the surrounding area of the grooves of the cylinder bottom and the cylinder barrel by using a calcium fluoride slag system flux-cored wire, and then welding by using a solid welding wire. The preparation method of the high corrosion resistant alloy cylinder body for the hydraulic support can improve the pitting corrosion resistance, the welding performance and the mechanical performance of the cylinder body, can meet various working mediums such as pure water, emulsion and the like, and solves the corrosion problem caused by the fact that the traditional material cannot be subjected to electroplating corrosion prevention treatment at the positions such as the vicinity of a welding seam and small holes of the cylinder wall.

Inventors

Xin Tongshuai
Hao Shenao
WANG LU
CUI LEILEI
YIN SHENGCHAO
LI FUYONG
LIU CHENG
LAN ZHIYU
GUO WEIMIN
LI ZHENG
WANG DONG

Assignees

郑州煤矿机械集团有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (9)

1. A preparation method of a high corrosion resistant alloy cylinder body for a hydraulic support comprises the following steps: The corrosion-resistant alloy material comprises the following components in percentage by mass ：0.07%≤C≤0.12%,0.20%≤Si≤0.50%,0.70%≤Mn≤1.20%,1.50%≤Cr≤2.00%,0.80%≤Ni≤1.6%,0.40%≤Mo≤0.70%,Cu≤0.20%,Al≤0.04%,V≤0.10%,P≤0.010%,S≤0.002%,O≤10ppm,H≤2ppm,0.005%≤N≤0.010%, and the balance of Fe, wherein the pitting corrosion resistance equivalent PREN of the corrosion-resistant alloy material is more than or equal to 2.0, the carbon equivalent CEV is less than or equal to 0.85, and the raw materials of the corrosion-resistant alloy material are melted and then subjected to molten iron desulfurization pretreatment, converter steelmaking treatment, external refining treatment, vacuum degassing treatment, casting treatment, electroslag remelting treatment and continuous casting treatment in sequence to obtain the corrosion-resistant alloy material; preparing a cylinder bottom and a cylinder barrel, namely processing the quenched and tempered corrosion-resistant alloy material into the cylinder bottom according to a cylinder bottom processing procedure, processing the quenched and tempered corrosion-resistant alloy material into the cylinder barrel according to a cylinder barrel processing procedure, and processing grooves on the cylinder bottom and the cylinder barrel respectively; Welding a cylinder bottom and a cylinder barrel, namely welding the cylinder bottom on the cylinder barrel, and welding a lower cavity joint seat on the cylinder bottom, wherein when the cylinder bottom is welded on the cylinder barrel, an encircling area formed by grooves of the cylinder bottom and the cylinder barrel is firstly welded by using a calcium fluoride slag-based flux-cored wire, and then welded by using a solid welding wire, and the calcium fluoride slag-based flux-cored wire comprises the following components, by mass, less than or equal to 0.10% of C, less than or equal to 0.50% of Si, less than or equal to 1.2% of Mn, less than or equal to 1.5% of Cr, less than or equal to 0.6% of Cr, less than or equal to 0.8% of Ni, less than or equal to 1.2% of Ni, and less than or equal to 0.20% of Cu.
2. The method for preparing a high corrosion resistant alloy cylinder for a hydraulic support according to claim 1, wherein in the step of providing the corrosion resistant alloy material, the external refining temperature is 1550-1565 ℃ and the refining time is more than 25 min when the external refining is performed, and the remelting rate of electroslag remelting is 1.8-kg/min-2.2 kg/min when the electroslag remelting is performed.
3. The method for preparing a cylinder block of a high corrosion resistant alloy for a hydraulic support according to claim 1, wherein in the step of preparing a cylinder bottom and a cylinder barrel, the corrosion resistant alloy material is firstly subjected to upsetting treatment, then subjected to hardening and shot blasting treatment, then subjected to cylinder bottom spigot turning treatment, and finally subjected to milling and drilling treatment, so that the cylinder bottom is prepared.
4. The method for preparing the high corrosion resistant alloy cylinder body for the hydraulic support, which is characterized by comprising the steps of firstly carrying out heat pipe penetrating treatment on the corrosion resistant alloy material, then carrying out blanking and tempering treatment, and then sequentially carrying out primary flat end face chamfering, rough boring an inner hole, welding a cavity joint seat and a lifting ring, aging, secondary flat end face chamfering, scraping the inner hole, rough turning a cylinder spigot, finish turning the cylinder spigot and drilling a liquid through hole.
5. The method for preparing the high corrosion resistant alloy cylinder body for the hydraulic support according to claim 3 or 4, wherein in the step of preparing the cylinder bottom and the cylinder barrel, when the corrosion resistant alloy material is subjected to quenching and tempering treatment, the quenching temperature is 880-900 ℃, the heat preservation time is 60-80 min, the quenching medium is a water-soluble quenching medium, the tempering temperature is 650-680 ℃ and the heat preservation time is 3-4 h, and the temperature is directly cooled to room temperature after tempering.
6. The method for manufacturing the high corrosion resistant alloy cylinder body for the hydraulic support according to claim 1,2, 3 or 4, wherein the step of welding the cylinder bottom and the cylinder barrel is characterized in that when the lower cavity joint seat is welded on the cylinder bottom, the cylinder bottom is preheated at the temperature of 250-300 ℃, single-layer single-pass welding is performed under the protection gas, the welding current is 230-260A, the welding voltage is 26-28V, the welding speed is 30 cm/min-40 cm/min, and the annealing is performed at the temperature of 300 ℃ for 2-3 h after the welding is completed.
7. A corrosion-resistant alloy material is characterized by comprising the following components ：0.07%≤C≤0.12%,0.20%≤Si≤0.50%,0.70%≤Mn≤1.20%,1.50%≤Cr≤2.00%,0.80%≤Ni≤1.6%,0.40%≤Mo≤0.70%,Cu≤0.20%,Al≤0.04%,V≤0.10%,P≤0.010%,S≤0.002%,O≤10ppm,H≤2ppm,0.005%≤N≤0.010%, in percentage by mass and the balance of Fe.
8. The corrosion-resistant alloy material according to claim 7, wherein the corrosion-resistant alloy material has a pitting corrosion resistance equivalent PREN of 2.0 or more and a carbon equivalent CEV of 0.85 or less.
9. The corrosion-resistant alloy material according to claim 7, which is characterized by being obtained by sequentially carrying out molten iron desulfurization pretreatment, converter steelmaking treatment, external refining treatment, vacuum degassing treatment, casting treatment, electroslag remelting treatment and continuous casting treatment on a corrosion-resistant alloy raw material containing the components in percentage by mass, wherein the external refining treatment is carried out at 1550-1565 ℃ for a refining time of more than 25 min, and the remelting rate of the electroslag remelting treatment is 1.8-kg/min-2.2 kg/min.

Description

Preparation method of high corrosion-resistant alloy cylinder body for hydraulic support and corrosion-resistant alloy material Technical Field The invention relates to the field of hydraulic supports, in particular to a preparation method of a high corrosion-resistant alloy cylinder body for a hydraulic support and a corrosion-resistant alloy material. Background The hydraulic support upright is one of the main body supporting components in the coal mining process. The hydraulic support upright post consists of an outer cylinder body, a middle cylinder body, a movable column, a guide sleeve and the like. The outer cylinder body is formed by welding an outer cylinder barrel, an outer cylinder bottom, a liquid through pipe, a joint seat and the like, is used in a severe environment with high temperature, high humidity, high salt and high dust in the pit, and the outer wall of the cylinder barrel is directly exposed in the pit environment, so that the surface of the cylinder barrel needs to have higher corrosion resistance. Meanwhile, the inner wall of the cylinder barrel is contacted with a hydraulic medium for a long time, and particularly after water is used as the hydraulic medium, the requirement on the corrosion resistance of the inner wall of the cylinder barrel is higher. The corrosion resistance of the cylinder material is different from that of the conventional corrosion-resistant steel exposed to the open air environment, and the corrosion resistance of the cylinder material is required to be higher than that of the conventional corrosion-resistant steel which is produced by corrosion and is used for preventing further corrosion of the matrix. Rust of cylinder materials generally occurs at inclusion sites in steel at the earliest, and conventional cylinder materials have excessive inclusion content and oversized inclusion regions which can initially form corrosion primary cells during service, thereby resulting in reduced corrosion resistance of the material. On the other hand, the hydraulic support oil cylinder is a heavy oil cylinder, the highest pressure of high-pressure liquid in the hydraulic support oil cylinder exceeds 70MPa, and in order to ensure service safety, the deformation of the oil cylinder under stress is generally strictly limited. That is, when the cylinder barrel is subjected to static load or impact dynamic load which is 1.5 times higher than rated pressure, the diameter expansion deformation amount of the cylinder barrel is less than 0.02% of the cylinder diameter, which puts extremely high requirements on the strength and toughness of the cylinder body material. In order to ensure the performance, the traditional product is manufactured by adopting a tempered 27SiMn, 30CrMnSi and other medium carbon alloy steel thick-wall seamless steel pipe, and the mechanical performance of the thick-wall seamless steel pipe can meet the requirements, but the corrosion resistance of the material is poor, and the inner surface of a cylinder barrel needs to be subjected to electroplating treatment. However, the positions such as the vicinity of the welding seam between the cylinder barrel and the cylinder bottom, small holes between the cylinder barrel and the joint seat and the like cannot be electroplated and preserved, so that the problems that the cylinder barrel is corroded frequently in the service process, a hydraulic system is polluted by rust products and the like are caused, and the service life of the cylinder barrel is seriously limited. Disclosure of Invention In order to improve the pitting corrosion resistance, welding performance and mechanical property of a cylinder body when pure water is used as a working medium and solve the corrosion problem caused by the fact that the traditional material cannot be subjected to electroplating corrosion prevention treatment at the positions of the vicinity of a welding seam, small holes on the cylinder wall and the like, the invention adopts the technical scheme that the preparation method of the high corrosion resistant alloy cylinder body for the hydraulic support comprises the following steps: The corrosion-resistant alloy material comprises the following components in percentage by mass ：0.07%≤C≤0.12%,0.20%≤Si≤0.50%,0.70%≤Mn≤1.20%,1.50%≤Cr≤2.00%,0.80%≤Ni≤1.6%,0.40%≤Mo≤0.70%,Cu≤0.20%,Al≤0.04%,V≤0.10%,P≤0.010%,S≤0.002%,O≤10ppm,H≤2ppm,0.005%≤N≤0.010%, and the balance of Fe, wherein the pitting corrosion resistance equivalent PREN of the corrosion-resistant alloy material is more than or equal to 2.0, the carbon equivalent CEV is less than or equal to 0.85, and the raw materials of the corrosion-resistant alloy material are melted and then subjected to molten iron desulfurization pretreatment, converter steelmaking treatment, external refining treatment, vacuum degassing treatment, casting treatment, electroslag remelting treatment and continuous casting treatment in sequence to obtain the corrosion-resistant alloy material; Preparing a c