A high-strength seamless steel pipe for a launch tube

Abstract

The utility model belongs to the steel processing technical field especially relates to a high strength seamless steel pipe for the special use of launch tube, including the octagonal pipe that adopts 30CrMnSiA high strength alloy steel to make, the inside of octagonal pipe is provided with the column pipe body that the inscribed circle diameter range is Phi295 to Phi305mm, and the wall thickness range of column pipe body is 19.73mm to 20.3mm, and the pipe body length range of octagonal pipe is 6000mm to 2000mm, the both ends of octagonal pipe are provided with the connecting portion of elongated pipe body length. The utility model whole design is in the promotion performance, also strengthened the security and maintainability of product.

Description

Technical Field

[0001] This utility model belongs to the field of steel processing technology, and in particular relates to a high-strength seamless steel pipe for use in launch tubes. Background Technology

[0002] In missile launch systems, the launch tube, as a core component that carries the missile, withstands the impact of high-temperature and high-pressure gas during launch, and is adaptable to transportation and deployment, places stringent requirements on the strength, spatial adaptability, and structural stability of the seamless steel pipe used. Currently, the industry mainstream uses circular high-strength seamless steel pipes to make launch tubes. This structure, due to its relatively uniform radial stress distribution, has been widely used in early single-unit or low-density deployment scenarios.

[0003] However, with the increasing demands of modern missile warfare for "high-density deployment of multiple launchers, highly mobile transportation, and high-precision launch," the inherent defects of circular seamless steel pipes have gradually become apparent:

[0004] Firstly, in multi-launcher layouts such as vehicle-mounted and ship-mounted systems, triangular gaps are easily formed between adjacent tubes when stacked with circular cross-sections, which limits the number of launch tubes per unit space. If the deployment density is to be increased, the size of the launcher needs to be enlarged, which in turn affects the platform's mobility and flexibility.

[0005] Secondly, the cylindrical body is prone to rolling during transportation or temporary parking, requiring additional complex fixing structures such as arc-shaped clamps and anti-roll brackets, which increases the overall weight and manufacturing cost, as well as the complexity of operation.

[0006] Third, the axial torsional and bending moment resistance of a circular cross-section is relatively weak. In order to meet the strength requirements of launch impact and wind load and compression resistance during field deployment, it is necessary to increase the wall thickness to compensate for this, which leads to an increase in the weight of the cylinder, increases the load burden on the launch platform, and weakens its mobility. Utility Model Content

[0007] The purpose of this invention is to provide a high-strength seamless steel pipe for use in launch tubes, in order to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the present invention adopts a high-strength seamless steel pipe for use in launch tubes, comprising an octagonal tube made of 30CrMnSiA high-strength alloy steel. The octagonal tube has an inner diameter of Φ295 to Φ305 mm, a wall thickness of 19.73 mm to 20.3 mm, and a length of 6000 mm to 2000 mm. The two ends of the octagonal tube are provided with connecting parts to extend the length of the octagonal tube.

[0009] Preferably, the connecting part includes a threaded head and an internal thread at the end of the tube body, wherein the threaded head of one octagonal tube is threadedly matched with the internal thread of another octagonal tube to achieve a connection that extends the length of the tube body.

[0010] Preferably, the end of the octagonal tube is provided with a laser-engraved marking area, which facilitates the marking of material grade, production furnace number, size specifications, implementation standard number and production date information.

[0011] Preferably, a heat protection layer is provided on the inner circumference of the column body. The heat protection layer is a ceramic-organic silicon composite coating with a thickness of 0.2 to 0.3 mm.

[0012] Preferably, the outer surface of the octagonal tube is provided with a wear-resistant coating, which is a polytetrafluoroethylene vinyl composite material coating with a thickness of 0.05 to 0.1 mm.

[0013] Preferably, a square hole is provided on the outer wall of the octagonal tube.

[0014] Preferably, all eight outer corners of the octagonal tube are rounded, and the outer surface of the octagonal tube is shot-peened.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] This invention perfectly solves the inherent defects of traditional circular launch tubes in multi-unit deployment and mobile transportation through its octagonal structure. The octagonal cross-section allows adjacent launch tubes to be arranged in close fit, greatly increasing the deployment density per unit space and significantly reducing the ineffective gaps between circular tubes. At the same time, the multiple planar structures provide natural anti-rolling characteristics, significantly enhancing stability during transportation and parking, and reducing reliance on complex fixing devices. In terms of mechanical performance, the octagonal multi-faceted structure effectively improves the bending and torsional stiffness of the tube, allowing for a more optimized wall thickness design under the same load requirements. This achieves overall structural lightweighting, reduces the load on the launch platform, and significantly improves the mobility and deployment flexibility of the weapon system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A front view of a high-strength seamless steel tube specifically designed for use in launch tubes;

[0019] Figure 2 A three-dimensional view of a high-strength seamless steel pipe specifically designed for launch tubes;

[0020] In the above figures, 1. Octagonal tube, 2. Column tube body, 3. Threaded head, 4. Internal thread, 5. Laser-engraved marking area. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1, as Figure 1-2 As shown, the specific design of the above-mentioned key components is described below: A high-strength seamless steel tube for use in launch tubes includes an octagonal tube 1 made of 30CrMnSiA high-strength alloy steel. The octagonal tube 1 has a cylindrical tube body 2 with an inscribed circle diameter ranging from Φ295 to Φ305 mm inside. The wall thickness of the cylindrical tube body 2 ranges from 19.73 mm to 20.3 mm. The tube length of the octagonal tube 1 ranges from 6000 mm to 2000 mm. Connecting parts for extending the tube length of the octagonal tube 1 are provided at both ends of the octagonal tube 1.

[0024] The octagonal cross-section of this high-strength seamless octagonal steel tube, through its multiple planes and angular structures, can more effectively decompose radial stress into multi-directional components when bearing internal launch loads. The reinforcing effect of the angular sections forms a more natural, deformation-resistant frame. When the high-temperature, high-pressure gas generated during missile launch acts on the inner wall of the tube, the octagonal planes bear the load evenly, while the angular sections act as reinforcing ribs, effectively suppressing the elliptical deformation tendency of the tube. The connection at both ends employs a precision fit design to ensure coaxiality and load transfer continuity when connecting multiple tube sections, making the entire launch tube system a unified whole. This integrated load-bearing structure offers numerous significant benefits. The octagonal cross-section greatly improves space utilization efficiency, allowing multiple launch tubes to be closely arranged. The planar contact characteristics completely eliminate the safety hazard of traditional round tubes easily rolling, greatly simplifying the external auxiliary structures required for transportation and fixation. The enhanced bending and torsional stiffness allows for optimized wall thickness design while meeting the same strength requirements, resulting in a reduction in overall weight and thus improving the mobility and deployment flexibility of the launch platform. Furthermore, the seamless, one-piece structure and the selection of high-performance alloy materials ensure the structural integrity and reliability of the product under extreme operating conditions.

[0025] The connecting part includes a threaded head 3 and an internal thread 4 at the end of the tube body. The threaded head 3 of one octagonal tube 1 and the internal thread 4 of another octagonal tube 1 are threadedly matched and connected. Extending the tube body length, the end of the octagonal tube 1 is provided with a laser-engraved marking area 5. This laser-engraved marking area 5 facilitates the marking of material grade, production furnace number, size specifications, implementation standard number, and production date information. A heat protection layer is provided on the inner circumference of the tube body 2. This heat protection layer is a ceramic-organic silicon composite coating with a thickness of 0.2–0.3 mm. The outer surface of the octagonal tube 1 is provided with a wear-resistant coating. This wear-resistant coating is a polytetrafluoroethylene (PTFE) vinyl composite material coating with a thickness of 0.05–0.1 mm. A square hole 6 is provided on the outer wall of the octagonal tube 1. The square hole 6 design facilitates installation and fixation with a mounting bracket. All eight outer corners of the octagonal tube 1 are rounded, and the outer surface of the octagonal tube 1 is shot-peened for strengthening. This design works synergistically through multiple protection and connection mechanisms. The connecting part adopts a precision-machined threaded structure. The mechanical connection and load transfer between pipe sections are achieved by screwing in the threaded head 3, forming a continuous load-bearing whole. The laser-engraved marking area 5 provides a dedicated identification area for easy observation. A permanent mark is formed on the pipe end surface using a high-energy laser, enabling product information traceability. The thermal protection layer, through the high-temperature stability of ceramic materials and the toughness of organosilicon, forms a thermal barrier under the impact of high-temperature combustion gases, slowing down the transfer of heat to the substrate. The wear-resistant coating utilizes the low-friction properties of polytetrafluoroethylene to reduce frictional wear with missile bodies or other contact parts. The rounded transition and shot peening treatment significantly improve the fatigue strength and service life of the pipe body by eliminating stress concentration at sharp corners and introducing surface compressive stress. This integrated design delivers significant comprehensive benefits. Precision threaded connections ensure flexibility and reliability in multi-segment extensions while maintaining excellent airtightness and coaxiality. A dual-layer functional coating provides targeted protection against both internal and external environments, significantly improving high-temperature resistance and wear resistance, and extending the service life of the launch tube. Rounded transitions and shot peening fundamentally improve the structure's fatigue resistance and enhance reliability under complex alternating loads. Laser-engraved marking area 5 enables full lifecycle quality tracking, greatly facilitating equipment maintenance, replacement, and management. The overall design enhances performance while also improving product safety and maintainability.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A high-strength seamless steel pipe for use in launching tubes, characterized in that, The octagonal tube is made of 30CrMnSiA high-strength alloy steel. The octagonal tube has an inner diameter of Φ295 to Φ305 mm and a wall thickness of 19.73 mm to 20.3 mm. The length of the octagonal tube is 6000 mm to 2000 mm. The two ends of the octagonal tube are provided with connecting parts to extend the length of the octagonal tube.

2. The high-strength seamless steel pipe for use in launching tubes according to claim 1, characterized in that, The connecting part includes a threaded head and an internal thread at the end of the tube body. The threaded head of one octagonal tube is threadedly matched with the internal thread of another octagonal tube to achieve a connection that extends the length of the tube body.

3. A high-strength seamless steel pipe for use in launching tubes according to claim 2, characterized in that, The end of the octagonal tube is provided with a laser-engraved marking area, which facilitates the marking of material grade, production furnace number, size specifications, implementation standard number and production date information.

4. A high-strength seamless steel pipe for use in launching tubes according to claim 3, characterized in that, A thermal protection layer is provided on the inner wall of the column tube. The thermal protection layer is a ceramic-organic silicon composite coating with a thickness of 0.2 to 0.3 mm.

5. A high-strength seamless steel pipe for use in launching tubes according to claim 4, characterized in that, The outer surface of the octagonal tube is provided with a wear-resistant coating, which is a polytetrafluoroethylene vinyl composite material coating with a thickness of 0.05 to 0.1 mm.

6. A high-strength seamless steel pipe for use in launching tubes according to claim 5, characterized in that, A square hole is provided on the outer wall of the octagonal tube.

7. A high-strength seamless steel pipe for use in launching tubes according to claim 6, characterized in that, The eight outer corners of the octagonal tube are all rounded, and the outer surface of the octagonal tube is shot-peened.

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