Process control method in the production of n80-1 non-quenched and tempered seamless oil casing

A process control, non-quenching and tempering technology, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problem that the parameters of deformation, deformation temperature, deformation rate and cooling speed cannot be controlled artificially, and lose operability and practicality. Meaning, lack of tensile and impact properties

Active Publication Date: 2016-05-11
HENGYANG VALIN STEEL TUBE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The traditional controlled rolling and controlled cooling technology needs to control the deformation amount, deformation temperature, deformation rate, and cooling speed, but for N80-1 non-quenched and tempered seamless oil casing, the deformation amount, deformation temperature, deformation rate, and cooling speed None of the parameters can be controlled by humans, so the operability and practical significance are lost
[0007] 2. The traditional controlled rolling and controlled cooling technology is mostly based on the research of hardness and structure, and lacks quantitative relationship data between tensile properties and impact properties. The two main performance indicators of N80-1 non-quenched and tempered seamless oil casing are respectively For tensile properties and impact toughness

Method used

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  • Process control method in the production of n80-1 non-quenched and tempered seamless oil casing
  • Process control method in the production of n80-1 non-quenched and tempered seamless oil casing
  • Process control method in the production of n80-1 non-quenched and tempered seamless oil casing

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Effect test

Embodiment 1

[0053] Embodiment 1. The N80-1 non-quenched and tempered seamless oil casing produced in this embodiment has an outer diameter of 139.7mm, a wall thickness of 6.2mm, a steel grade of 36Mn2V, and a production unit of ∮340.

[0054] According to Table 1 and Table 2, the basic parameters corresponding to the specification φ139.7mm×6.2mm are: continuous rolling deformation 1.486382, continuous rolling deformation rate 0.506940S -1 , Calibration deformation 0.222725, Calibration deformation rate 0.206606S -1 , The cooling rate is 2.150373°C / s, where: the cooling rate is calculated by the formula (1). The temperature control range of continuous rolling is 1050℃~1100℃, the best control temperature is 1050℃, the sizing temperature control range is 820℃~870℃, the best control temperature is 820℃. The yield and tensile strength of the product are between 633MPa~651MPa and 843MPa~860MPa respectively, and the impact toughness is ≥48J. When the continuous rolling and sizing temperatures ...

Embodiment 2

[0058] Embodiment 2. The N80-1 non-quenched and tempered seamless oil casing produced in this embodiment has an outer diameter of 244.48mm, a wall thickness of 11.99mm, a steel grade of 40Mn2V, and a production unit of ∮340.

[0059] According to Table 1 and Table 2, the basic parameters corresponding to the specification φ244.48mm×11.99mm are: continuous rolling deformation 1.041851, continuous rolling deformation rate 0.501069S -1 , Calibration deformation 0.145901, Calibration deformation rate 0.199547S -1 , Cooling rate 0.66787 ℃ / s. The temperature control range of continuous rolling is 1050℃~1100℃, the best control temperature is 1050℃, the sizing temperature control range is 820℃~870℃, the best control temperature is 820℃. The yield and tensile strength of the product are between 661MPa~688MPa and 936MPa~969MPa respectively, and the impact toughness is ≥46J. When the continuous rolling and sizing temperatures are controlled at 1050°C and 820°C, respectively, the corr...

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Abstract

The invention discloses a process controlling method in production of an N80-1 non-quenching seamless oil sleeve. On the premise that performance influence parameters such as deformation, deformation rate, and cooling speed of the N80-1 non-quenching seamless oil sleeve are not controlled manually, the control of the deformation, the deformation rate and the cooling speed is eliminated, and the control of the specifications and steel grade change is added, and a binding type combination mode of specification, steel grade change, continuous rolling temperature control and sizing temperature control is formed; and the performance of the N80-1 non-quenching seamless oil sleeve is effectively controlled by quantitative relationship between the process parameters and the drawing and impacting, so that the aims of stabilizing the product performance and improving yield are fulfilled.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipes in the metallurgical industry, in particular to a process control method in the production of N80-1 non-quenched and tempered seamless oil casing pipes. Background technique [0002] N80-1 non-quenched and tempered seamless oil casing is produced by hot-rolling medium carbon-manganese-containing V steel, and the finishing temperature is controlled to be equal to or equal to the phase transition point Ar3. Normalizing treatment, the existing N80-1 non-quenched and tempered seamless oil The production method of the casing has the advantages of low cost, saving heat treatment resources and shortening lead time. However, the process control of N80-1 non-quenched and tempered seamless oil casing is very complicated (such as deformation amount, deformation rate, cooling rate and other performance influencing factors cannot be controlled artificially), coupled with the lack of effective proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/78
Inventor 方剑
Owner HENGYANG VALIN STEEL TUBE
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