An economical corrosion-resistant sucker rod wire rod and its manufacturing method

Abstract

The invention relates to an economical corrosion-resistant steel and a manufacturing method of the steel wire rod. Its composition is (wt%): C: 0.06-0.10%, Si: 0.20-0.30%, Mn: 0.50-0.60%, P: ≤0.012%, S: ≤0.010%, Al: 0.02-0.04%, Cu: 0.20-0.30%, Ni: 0.20-0.25%, Cr: 2.95-3.10%, Mo: 0.25-0.35%, N: ≤0.0060%, and the rest are Fe and unavoidable impurities. In this method, after continuous casting into billets, the billets are heated and discharged at a temperature of 1150°C±15°C, the inlet temperature of the finishing mill is 1000°C±10°C, and the spinning temperature is 950°C±10°C, and controlled rolling and cooling in a wire rod mill. into ф13.0~ф35.0mm wire rod.

Description

technical field [0001] The invention relates to an economical, corrosion-resistant, continuous or discontinuous steel for sucker rods, especially the chemical composition of steel for continuous corrosion-resistant sucker rods and the steel type ф13.0-ф35.0mm wire rod manufacturing method. Background technique [0002] Rod pump pumping is a widely used oil pumping method in the world's oil extraction industry. About 90% of the oil wells on land in my country use rod pumps. After the mid-1980s, my country's major oil fields have entered the middle and late stages of exploitation. The water content of crude oil is rising, the depth of pumping is increasing, and the number of heavy oil areas is increasing. The development of my country's oilfields has continuously put forward new requirements for rod pumping equipment, which has promoted the development of my country's sucker rod materials. With the rise of international oil prices, some oil production companies in my country...

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Problems solved by technology

[0003] Material of steel for sucker rods: low-medium carbon alloy steel is generally used, such as 20CrMoA, 35CrMoA, 20Cr2MoNi and other quenched and tempered steels containing chromium and molybdenum. The problem with this steel type is that the material price is cheaper than stainless steel, but the material is not corrosion-resistant , short service life

Currently fighting against CO 2 , Cl - In the selection of ionic corrosion materials, the addition of Cr, Ni and other elements (such as 13Cr-2Mo-6Ni, 22-25Cr and other stainless steels) that can improve the thermodynamic stability of the alloy and directly block the anode process is generally used in the world, so that the surface of the material can be formed quickly. The corrosion structure of the surface protective layer of highly stable alloy components with a thickness of one or several atomic layers, but the price of Cr and Ni elements is relatively high, and adding a large amount will increase the cost of the material

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