High-precision cold drawn pipe and manufacturing method thereof

A manufacturing method and technology of cold-drawn pipes, which are applied in the field of steel pipes, can solve problems such as unmentioned strength, achieve the effects of reducing heat treatment deformation, ensuring precision, and improving impact toughness

Active Publication Date: 2016-04-06
XCMG HYDRAULICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since cold rolling is formed by multiple processes, and the cost is more than 20% higher than that of hot rolling, the patent does not mention how much strength this more complicated and costly processing method can improve

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  • High-precision cold drawn pipe and manufacturing method thereof

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing.

[0028] A high-precision cold-drawn tube, using low-alloy high-strength structural steel as a blank, the chemical element composition and mass percentage content are: carbon C≤0.20%, silicon Si≤0.50%, manganese Mn≤1.70%, phosphorus P≤0.035% , sulfur S≤0.035%, niobium Nb≤0.07%, vanadium V≤0.20%, titanium Ti≤0.20%, chromium Cr≤0.30%, nickel Ni≤0.80%, copper Cu≤0.30%, nitrogen N≤0.015%, molybdenum Mo≤0.20%, aluminum Al element and trace boron B element are added to adjust steelmaking quality and mechanical properties, and the balance is iron Fe.

[0029] Preferably, when vanadium V≤0.15%, nickel Ni≤0.50%, nitrogen N≤0.012%, molybdenum Mo≤0.10%, tensile strength≥700Mpa, impact energy≥27.

[0030] Preferably, when vanadium V≤0.20%, nickel Ni≤0.50%, nitrogen N≤0.015%, molybdenum Mo≤0.10%, tensile strength≥745Mpa, impact energy≥27.

[0031] Preferably, when vanadium V≤0.20%, nick...

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Abstract

The invention discloses a high-precision cold drawn pipe and a manufacturing method thereof. Low-alloy high-tensile structural steel is used as the blank. The high-precision cold drawn pipe is mainly composed of carbon, silicon, manganese, phosphorus, sulphur, niobium, vanadium, titanium, chromium, nickel, copper, nitrogen, molybdenum, aluminum and a trace of boron which are used for regulating the steelmaking quality and mechanical performance, and iron. The high-precision cold drawn pipe has high precision, high strength and high tenacity. The manufacturing method is simple. The manufactured steel pipe is high in precision, and is high in strength and tenacity compared with cold drawn pipes. By means of the method, the strengthened and toughened high-precision cold drawn pipe can be manufactured, it can be ensured that the tensile strength of cold drawn pipes made from the same materials exceeds the national standard 100 Mpa, and the test result of a V2 type notch impact sample exceeds 27 J.

Description

technical field [0001] The invention relates to a high-precision cold-drawn pipe and a manufacturing method thereof, belonging to the technical field of steel pipes. Background technique [0002] The cold-drawn tubes in the industry are formed by multi-pass cold drawing or one-pass or two-pass continuous cold-drawing. For multi-pass cold-drawn steel pipes, if there are no multiple heat treatments in the middle, there is a risk of fine cracks or even fractures; for one-pass or two-pass continuous cold-drawn steel pipes, although it is easy to produce, the stability of dimensional accuracy is not satisfactory , and did not give full play to the performance of the material, and there is still room for improvement in strength. Moreover, the final heat treatment temperature of cold-drawn tubes at home and abroad is generally higher than 500°C to remove residual stress and improve the toughness of cold-drawn tubes, but at the same time it also reduces the strength of cold-drawn t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/18C22C38/08C22C38/16B21C1/22C21D8/10
CPCB21C1/22C21D8/105C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 叶海燕刘庆教罗海霞张虹源
Owner XCMG HYDRAULICS CO LTD
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