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Stainless steel seamless tube and preparation method and application thereof

A seamless pipe and stainless steel technology, applied in the field of stainless steel seamless pipe and its preparation, can solve the problem of inability to produce seamless steel pipes with large diameter and uniform internal structure at the same time

Pending Publication Date: 2022-03-11
ZHEJIANG JIULI HI TECH METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that the production process in the prior art cannot produce seamless steel pipes with large diameter and uniform internal structure at the same time, and provides a stainless steel seamless pipe and its preparation method and application to overcome the above defects

Method used

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  • Stainless steel seamless tube and preparation method and application thereof
  • Stainless steel seamless tube and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The outer diameter specification of the large-diameter austenitic stainless steel pipe prepared in this embodiment is 813mm×15mm×5000mm.

[0049] Firstly, the steel ingot is smelted by AOD furnace plus electroslag remelting process, and the steel billet is prepared by forging. The chemical composition of the billet is (mass percentage): C 0.045, Si 0.35, Mn 1.56, P 0.010, S 0.001, Ni 12.35, Cr17.45, Co 0.015, H 0.0004, B 0.0012, N 0.060, Fe balance. Class A non-metallic inclusions in steel billets are grade 0, class B non-metallic inclusions are 0.5, class C non-metallic inclusions are 0.5, and class D non-metallic inclusions are 1.0. Growing up has beneficial effects.

[0050] The steel billet is prepared by vertical hot extrusion process. The temperature of the hot extrusion process is 1250 °C, and the specification of the extruded tube is 813mm×15mm×5000mm. , the extrusion ratio is 5.2, the average grain size of the vertical hot extrusion blank tube is 150μm, a...

Embodiment 2

[0059] The outer diameter specification of the large-diameter austenitic stainless steel pipe prepared in this embodiment is 610mm×10mm×6000mm.

[0060] Firstly, the steel ingot is smelted by AOD furnace plus electroslag remelting process, and the steel billet is prepared by forging. The chemical composition of the billet is (mass percentage): C 0.045, Si 0.35, Mn 1.25, P 0.015, S 0.001, Ni 12.5, Cr17.32, Co 0.012, H 0.0005, B 0.0015, N 0.070, Fe balance. Class A non-metallic inclusions in steel billets are grade 0, class B non-metallic inclusions are 0.5, class C non-metallic inclusions are 0, and class D non-metallic inclusions are 0.5. Growing up has beneficial effects.

[0061] The main manufacturing process steps are as follows:

[0062] The steel billet is prepared by a vertical hot extrusion process. The temperature of the hot extrusion process is 1230 ° C, and the specification of the extruded tube is 680×25mm, the extrusion ratio is 7.2, the average grain size o...

Embodiment 3

[0069] The outer diameter specification of the large-diameter austenitic stainless steel pipe prepared in this embodiment is 850mm×15mm×5000mm.

[0070] Firstly, the steel ingot is smelted by AOD furnace plus electroslag remelting process, and the steel billet is prepared by forging. The chemical composition of the billet is (mass percentage): C 0.017, Si 0.235, Mn 1.03, P 0.0275, S 0.0012, Ni 9.85, Cr19.44, Co 0.015, H 0.0004, B 0.009, N 0.110, Fe balance. Class A non-metallic inclusions in steel billets are grade 0, class B non-metallic inclusions are 0.5, class C non-metallic inclusions are 0.5, and class D non-metallic inclusions are 1.0. Growing up has beneficial effects.

[0071] The blank tube is prepared by vertical hot extrusion process for the steel billet, the temperature of the hot extrusion process is 1200°C, and the specification of the extruded tube is 880×29mm, the extrusion ratio is 15.1, the average grain size of the vertical hot extrusion blank tube is ...

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Abstract

The invention relates to the field of seamless steel pipes, in particular to a stainless steel seamless pipe and a preparation method and application thereof.The preparation method comprises the following steps that cold drawing is conducted on a pipe in a small-deformation mode, a medium-deformation mode and a large-deformation mode respectively, and solid solution heat treatment needs to be conducted on the pipe after cold drawing is finished every time; and finally, the stainless steel seamless tube with the uniform internal grain structure size is obtained. According to the method, the grain structure in the stainless steel seamless tube is refined and uniformly distributed in a mode of combining different deformation amounts with heat treatment, and finally, a uniform structure with the grain size of 4-6 levels and the level difference smaller than 2 levels is achieved. Meanwhile, by adopting the manufacturing process, the large-diameter stainless steel seamless steel which is uniform in grain structure distribution, larger than 800mm in pipe outer diameter and larger than 10mm in wall thickness can be manufactured, and the large-diameter stainless steel seamless steel pipe can be used for a main pipeline system of an advanced nuclear power station.

Description

technical field [0001] The invention relates to the field of seamless steel pipes, in particular to a stainless steel seamless pipe and its preparation method and application. Background technique [0002] In advanced nuclear power technology, large-diameter stainless steel pipes of many specifications are usually required in the reactor primary and secondary circuit systems, such as 316 and 321 series austenitic stainless steel seamless pipes with an outer diameter of about 508-914mm. The current large-diameter seamless pipe manufacturing technology usually adopts integral forging pipe, cold rolling and bar machining. [0003] In the prior art, hot extrusion has been widely used in the forming of difficult-to-process materials due to its advantages of improving the deformation ability of metals, high comprehensive product quality, and wide range, and has become an important method for hot forming of high-alloy and special-alloy seamless steel pipes. one. The seamless stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21C1/22B21C23/08C21D8/10
CPCB21C37/06B21C1/22B21C23/08C21D8/105C21D2211/001
Inventor 佴启亮王宝顺何宇宏沈红英蔡黎明王坤罗有心涂正平沈诚飞苏诚郑炜炜
Owner ZHEJIANG JIULI HI TECH METALS
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