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Production method of hot-rolling seamless steel pipe billet

A production method and technology for seamless steel pipes, which are applied in the direction of improving process efficiency, can solve the problem that hot-rolled seamless steel pipe billets cannot meet the direct cold-drawing production process, etc., and achieve low yield strength, high longitudinal elongation, and improved The effect of elongation

Inactive Publication Date: 2014-12-10
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the purposes of the present invention is to provide a production method of hot-rolled seamless steel pipe blanks for the above-mentioned shortcomings, in order to solve the problem that the hot-rolled seamless steel pipe blanks for medium and low carbon oil cylinders produced in the prior art cannot meet the requirements of direct cooling. Questions about the requirements of the production process

Method used

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  • Production method of hot-rolling seamless steel pipe billet
  • Production method of hot-rolling seamless steel pipe billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The production method of the hot-rolled seamless steel pipe billet of the present invention mainly includes the steps of steelmaking, continuous casting, pipe rolling and on-line heat treatment, and the seamless steel pipe billet produced by the hot-rolled seamless steel pipe billet production method is mainly used for production cylinder.

[0041] The production specifications are 159*17 hot-rolled seamless steel pipe blanks for oil cylinders. The chemical composition of the hot-rolled seamless steel pipe blanks for oil cylinders is shown in Table 1 by weight percentage (%), and the balance is Fe and other impurities.

[0042] C

Si

mn

P

S

Cr

Ni

Cu

[0043] 0.24

0.28

0.76

0.013

0.014

0.03

0.03

0.06

[0044] Table I

[0045] In the steelmaking step, the step of pre-desulfurizing molten iron is firstly carried out, and then the molten steel is initially smelted in a 70T converter, an...

Embodiment 2

[0059] The production method of this embodiment is exactly the same as that of Example 1, the only difference is that the specifications of the hot-rolled seamless steel pipe blanks for oil cylinders produced in this embodiment are 168*15 hot-rolled seamless steel pipe blanks for oil cylinders. The chemical composition of the hot-rolled seamless steel pipe blanks for oil cylinders is shown in Table 4 by weight percentage (%), and the balance is Fe and other impurities.

[0060] C

Si

mn

P

S

Cr

Ni

Cu

0.25

0.28

0.80

0.012

0.013

0.03

0.03

0.07

[0061] Table four

[0062] In this embodiment, during converter smelting, the carbon content and phosphorus content are controlled during converter tapping, the carbon content is 0.13%, and the phosphorus content is 0.007%. During the alloying operation, the content of each chemical component in the molten steel is adjusted according to the content of each chem...

Embodiment 3

[0069] The production method of this embodiment is exactly the same as that of Example 1, the only difference is that the specification of the hot-rolled seamless steel pipe blank for oil cylinders produced in this embodiment is 139.7*17 hot-rolled seamless steel pipe blanks for oil cylinders, the specification The chemical composition of the hot-rolled seamless steel pipe blanks for oil cylinders is shown in Table 7 by weight percentage (%), and the balance is Fe and other impurities.

[0070] C

Si

mn

P

S

Cr

Ni

Cu

0.25

0.30

0.83

0.015

0.014

0.03

0.02

0.06

[0071] Table seven

[0072] In this embodiment, during converter smelting, the carbon content and phosphorus content are controlled when the converter is tapping, and the carbon content is 0.14%, and the phosphorus content is 0.008%. During the alloying operation, adjust the content of each chemical component in the molten steel according to th...

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Abstract

The invention discloses a production method of a hot-rolling seamless steel pipe billet. The production method is characterized by comprising the following steps of (1) steel making, (2) continuous casting and (3) pipe rolling and online heat treatment. The method is simple in step and convenient to operate, in the steel making procedure, specially-designed low-alkalinity acid synthesis refining slag is adopted to perform refining, brittle slag inclusion in steel is converted into plastic slag inclusion, and therefore in the cold drawing process of the hot-rolling seamless steel pipe billet for an oil cylinder, the pipe billet is not prone to being drawn to be cracked, and white spots, pits and other defects which affect the product quality and are caused by the brittle slag inclusion do not easily appear in the surface of a machined steel pipe. Therefore, the quality of the manufactured seamless steel pipe billet can be improved, and the pipe billet can be suitable for being used and popularized.

Description

technical field [0001] The invention relates to a production method of a seamless steel tube blank, in particular to a production method of a hot-rolled seamless steel tube blank. Background technique [0002] The production process of cold-drawn seamless steel pipes for oil tanks is generally: hot-rolled seamless steel pipe blanks—annealing heat treatment—pickling, phosphating, saponification—cold drawing into finished steel pipes. Among them, the function of annealing heat treatment process is to improve the finished product quality of cold-drawn seamless steel pipe by reducing the yield strength and residual stress of hot-rolled seamless steel pipe billet, improving its plasticity and uniformity of structure. [0003] At present, many manufacturers of cold-drawn seamless steel pipes omit the annealing heat treatment process of the tube blank when producing cold-drawn seamless steel pipes for medium and low carbon oil tanks, and adopt the production process of direct cold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C21D8/10C21D1/84C21C7/076C22C38/42C22C38/20C22C38/16C22C38/40C22C38/18C22C38/08C22C38/04
CPCY02P10/20
Inventor 陈雨吴红易兴俊张先华李荣芳
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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