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Petroleum casing pipe with high strength and high toughness and preparing method thereof

A technology of petroleum casing and manufacturing method, which is applied in the field of petroleum casing with high strength and high toughness and its manufacturing, and can solve problems such as constraints

Inactive Publication Date: 2009-11-25
TIANJIN PIPE GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems restrict the development of oil casing with ultra-high strength and high toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] Embodiment: Produce petroleum pipe V150 (by 244.48 * 15.11mm) by above-mentioned composition and method, its chemical composition and manufacturing process parameter are as follows:

[0110] The weight components of oil casing are: C: 0.23%, Si: 0.27%, Mn: 0.50%, Cr: 1.00%, Mo: 0.73%, Al: 0.030%, Ni: 0.05%, Cu: 0.070%, V: 0.080%, Ca: 0.0016%, P: 0.008%, S: 0.001%, and the rest is iron.

[0111] Sponge iron and scrap steel are used as raw materials for steelmaking, melted into molten steel in an electric arc furnace, refined outside the furnace and vacuum degassed to obtain the above chemical composition, and continuously cast into a round billet; the cooled continuous casting billet is cast in a ring Heating in the heating furnace, the furnace temperature is 1310°C, the heat centering is 1250°C, the hot piercing is 1225°C, the continuous rolling temperature is 1080°C, the sizing is 900°C, cooling, sawing; heat treatment: quenching at 920°C (water Quenching), tempering ...

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PUM

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Abstract

The present invention provides a petroleum casing pipe with high strength and high toughness, wherein the weight of the component element of the casing pipe steel is characterized proportionally. The invention also provides a preparing method for preparing the petroleum casing pipe with high strength and high toughness, wherein the method comprises the following steps: 1. smelting the ingredients and casting the tube blank; 2. punching and tandem rolling of the steel tube; and 3. heat treating. The invention has the following beneficial effects: the performance of the petroleum casing pipe obtained by the method is the performance of the steel with lower content of alloy and the cost is low; a low carbon content is adopted so that the lath martensite tissue is obtained after heat treatment, the high toughness is provided after tempering and a delayed fracture resistance is provided; the complex micro-alloying processing techniques of V, Nb, Ti, B, etc. are adopted for strengthening the matrix, strengthening the grain-boundary strength, increasing the tempering resistance, reducing the content of manganese element, reducing the content of the impurity elements and improving the shape of the inclusion. The rolling ratio is optimized so that the aeolotropism of the material is remarkably reduced and the horizontal and vertical impact toughness of the material is larger than 0.8. The casing pipe of the invention far exceeds the prior highest steel grade requirement of the API standard.

Description

technical field [0001] The invention belongs to the manufacturing technology of seamless steel pipes for the oil and gas industry in the metal material industry, and in particular relates to a high-strength and high-toughness oil casing and a manufacturing method thereof. Background technique [0002] Due to the severe situation of global oil supply, the exploration and construction of ultra-deep oil and gas wells has become a major basic project related to the long-term stable and sustainable development of the oil and gas industry. Ultra-high-strength and high-toughness OCTG, as an important industrial material for deep and ultra-deep well construction in the oil drilling industry, has become a hot spot in the research and development of materials at home and abroad in recent years. Due to the high temperature and high pressure environment downhole, ultra-deep wells have special requirements for the strength, toughness, sealing performance, crack growth resistance, bending...

Claims

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Application Information

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IPC IPC(8): E21B17/00C22C38/32C22C33/04C21C7/10C21C7/076B22D11/11B22D11/22C21D8/10C21D1/18
CPCY02P10/20
Inventor 张传友严泽生付继成宗卫兵刘江成孙开明江勇周家祥史庆志李效华章华明周晓锋李毅张宝惠王青峰
Owner TIANJIN PIPE GROUP CORP
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