Novel martensitic heat-resistant steel and method for manufacturing thin-walled elbow of seamless steel pipe using same

A seamless steel pipe and martensite technology, which is applied in the field of additive manufacturing, can solve the problems of long production cycle and high production cost of pipe bending, and achieve the effect of avoiding uncertainty of arc position, improving quality, and fine and uniform grains.

Active Publication Date: 2018-09-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it possible to manufacture complex structural parts that were restricted by traditional manufacturing methods in the past.
[0003] For elbows of different sizes or special shapes, the current production cycle of bending pipe processing is long and the production cost is high

Method used

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  • Novel martensitic heat-resistant steel and method for manufacturing thin-walled elbow of seamless steel pipe using same
  • Novel martensitic heat-resistant steel and method for manufacturing thin-walled elbow of seamless steel pipe using same
  • Novel martensitic heat-resistant steel and method for manufacturing thin-walled elbow of seamless steel pipe using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Establish a three-dimensional model according to the formed parts, use image layering software to slice and layer the three-dimensional model, the height of each layer is 0.02mm, and use path planning software to design the forming path. The new martensitic heat-resistant steel castings were forged into wire rods and cold drawn into wires with a diameter of 1 mm. Among them, the composition of the new martensitic heat-resistant steel castings includes: 0.07% carbon, 0.2% silicon, 0.5% manganese, 8.0% chromium, 1.5% tungsten, 0.2% molybdenum, 0.15% vanadium, 0.15% tantalum, 0.05% LaB6, the balance is iron.

[0061] Feed the obtained wire through the wire feeding device, energize and radiate the arc, and the laser beam of the laser induces the arc to scan according to the forming path of the current layer. The purity of the gas is ≥99.99%. The laser power is 400w, the energizing current is 132A, the energizing voltage is 14.6V, the wire feeding speed is 3m / min, the defo...

Embodiment 2

[0064] The seamless steel pipe thin-walled elbow was prepared according to the method described in Example 1. The difference from Example 1 is that the composition of the novel martensitic heat-resistant steel casting in this example includes: 0.11% carbon, 0.4% silicon, 0.5% manganese, 9.1% chromium, 1.5% tungsten, 0.4% molybdenum, 0.2% vanadium, 0.15% tantalum, 0.05% LaB6, and the balance is iron.

[0065] The above-mentioned new type of martensitic heat-resistant steel casting is prepared by laser additive manufacturing method for seamless steel pipe thin-walled elbow, the height of each layer is 0.06mm, the laser power is 500w, the current is 105A, and the voltage is 12.5V , the wire feeding speed is 4m / min, the defocus is 3mm, and the forming speed is 6mm / s. The process parameters of the stress relief annealing treatment are: 750° C. for 1.5 hours. attached figure 2 It is a picture of the metallographic structure of the seamless steel pipe thin-walled elbow prepared in...

Embodiment 3

[0068] The seamless steel pipe thin-walled elbow was prepared according to the method described in Example 1. The difference from Example 1 is that the composition of the novel martensitic heat-resistant steel casting in this example includes: 0.15% carbon, 0.4% silicon, 0.5% manganese, 11.5% chromium, 1.5% tungsten, 0.6% molybdenum, 0.2% vanadium, 0.15% tantalum, 0.3% LaB6, and the balance is iron.

[0069] The above-mentioned new type of martensitic heat-resistant steel casting is prepared by laser additive manufacturing method for seamless steel pipe thin-walled elbow, the height of each layer is 0.1mm, the laser power is 600w, the current is 80A, and the voltage is 10.9V , the wire feeding speed is 5m / min, the defocus is 3mm, and the forming speed is 6mm / s. The process parameters of the stress relief annealing treatment are: 750° C. for 2 hours. attached image 3 It is a photo of the metallographic structure of the seamless steel pipe thin-walled elbow prepared in Exampl...

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Abstract

The invention relates to the technical field of additive manufacturing, in particular to novel martensitic heat-resistant steel and a method for manufacturing a thin-walled elbow of a seamless steel pipe. The novel martensitic heat-resistant steel comprises the compositions of, by weight, 0.05-0.15% of carbon, 0.1-0.4% of silicon, 0.3-0.6% of manganese, 8.0-12.0% of chromium, 1.5-1.9% of tungsten,0.1-0.8% of molybdenum, 0.1-0.3% of vanadium, 0.1-0.3% of tantalum, 0.05-0.3% of lanthanum hexaboride and the balance iron. The thin-walled elbow of the seamless steel pipe prepared by the novel martensitic heat-resistant steel by adopting laser-CMT composite additive manufacturing is compact in structure, the alloy structure comprises lath martensite and dispersed carbide, crystal grains are fine and uniform, and no columnar crystal texture is generated; and due to the addition of LaB6 to the novel martensitic heat-resistant steel, the LaB6 reacts with O to form LaBO3, and then the LaBO3 decomposes into La2O3 and B2O3 which can be used for deoxidation and slag formation of a micro-melting bath in the additive manufacturing process, the formability and manufacturability are improved, theforming structure is improved, and the mechanical properties of formed parts are improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a novel martensitic heat-resistant steel and a method for manufacturing thin-walled elbows of seamless steel pipes using the same. Background technique [0002] Additive Manufacturing (AM), commonly known as 3D printing, is a fusion of computer-aided design, material processing and forming technology, based on digital model files, through software and numerical control system to combine special metal materials, non-metal materials and medical biological Materials are piled up layer by layer according to extrusion, sintering, melting, photocuring, spraying, etc., to create a manufacturing technology for physical objects. Compared with the traditional processing mode of raw material removal-cutting and assembly, it is a "bottom-up" manufacturing method through material accumulation, starting from scratch. This makes it possible to manufacture complex structural part...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/26C22C38/02C22C38/04C22C38/32C22C33/04B22F3/105B22F5/12B33Y70/00
CPCC22C33/04C22C38/005C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/32B22F5/106B33Y70/00B22F10/00B22F10/25B22F10/64B22F10/36B22F10/32Y02P10/25
Inventor 夏志新陈磊石拓张锐
Owner SUZHOU UNIV
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