Unlock instant, AI-driven research and patent intelligence for your innovation.

High-strength petroleum steel pipe and preparation method

A petroleum steel pipe and high-strength technology, which is applied in the field of high-strength petroleum steel pipe and its preparation, can solve the problems of high cost pressure and achieve the effects of refining grains, improving purity, and improving strength and toughness

Active Publication Date: 2019-04-12
LINZHOU FENGBAO PIPE
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of high V alloys to produce N80-1 steel grades is facing great cost pressure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-strength petroleum steel pipe and preparation method
  • High-strength petroleum steel pipe and preparation method
  • High-strength petroleum steel pipe and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The following lists 5 examples A1-A5 and 2 comparative examples B1-B2 to illustrate the present invention in detail.

[0025] The steel pipes prepared in Examples A1-A5 and Comparative Examples B1-B2 have a size of Φ139.7×10.54mm, and are made by the method of the present invention. The chemical composition weight ratio of the steel pipes is shown in Table 1, and the process parameters are shown in Table 2. Show.

[0026] (1) Smelting molten steel: take each raw material according to the proportioning ratio, and smelt it into molten steel;

[0027] (2) Calcium treatment: After molten steel is refined outside the furnace and vacuum degassed, calcium treatment, alloying, alloy melting, continuous casting into round billets, and alloying are used to control the distribution of sulfides; the distribution of sulfides is fine spherical, Diffused uniformly;

[0028] (3) Piercing: The round billet is soaked in a ring furnace at 1220-1260°C for 3-4 hours, the piercing temperat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a high-strength petroleum steel pipe and a preparation method. The high-strength petroleum steel pipe is prepared from, by weight percent, 0.35% to 0.39% of C, 0.25% to 0.55% of Si, 1.45% to 1.65% of Mn, not larger than 0.012% of P, not larger than 0.005% of Si, 0.01% to 0.04% of Al, 0.2% to 0.4% of Cr, 0.005% to 0.02% of Ti, 0.015% to 0.04% of Nb, 0.02% to 0.055% of V, 0.013% to 0.017% of N, 0.0005% to 0.005% of Ca and the balance Fe and inevitable impurities. The petroleum steel pipe is prepared from the raw materials through a series of procedures of steel melting, calcium treatment, punching, pipe rolling, reheating, tension reducing or sizing, and high strength and high toughness are achieved.

Description

technical field [0001] The invention relates to a petroleum steel pipe and a preparation method, in particular to a high-strength petroleum steel pipe and a preparation method. Background technique [0002] N80 steel grade oil casing is one of the most widely used varieties in oil and gas wells, mainly used for casing strings with a depth of 500-4000m. In recent years, with the rapid development of the petroleum industry, the market demand for petroleum casings has increased year by year. At present, the demand for N80 steel grade casings is as high as 2 million tons. According to API standards, the yield strength of N80 steel casing is 552-758MPa, and the tensile strength is ≥689MPa. N80 steel grade can be delivered in the quenched and tempered state of the whole pipe, and can also be delivered in the non-quenched and tempered state. Casing products of grade 80 can be easily obtained through quenching and tempering. But the quenching and tempering of the whole tube requir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/38C22C38/28C22C38/26C22C38/24B21C37/06C21D8/10
CPCB21C37/06C21D8/105C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 肖永忠曹铜壁向鹏高磊胡晨龙王文强李松涛
Owner LINZHOU FENGBAO PIPE