CN102690998A

CN102690998A - Oil pipeline steel

Info

Publication number: CN102690998A
Application number: CN2012101307215A
Authority: CN
Inventors: 文小明; 赵科; 赵迪; 刘志璞; 崔洪涛
Original assignee: Bengang Steel Plates Co Ltd
Current assignee: Bengang Steel Plates Co Ltd
Priority date: 2012-04-29
Filing date: 2012-04-29
Publication date: 2012-09-26

Abstract

The invention relates to an oil pipeline steel. The oil pipeline steel is consisted of the following materials of, in percentage by weight, 0.02-0.04% of carbon, 1.60-1.65% of manganese, 0.070-0.075% of niobium, 0.011-0.013% of titanium, 0.22-0.27% of chromium, 0.030-0.035% of aluminium, 0.11-0.15 % of molybdenum, and the balance being iron and inevitable impurities. The oil pipeline steel greatly reduces the production cost with no addition of the three noble metals such as nickel, copper and vanadium, and the yield strength per square inch reaches to 70000 pounds (X70) which meets the X70 standard stipulated by the state.

Description

A kind of oil pipeline steel

Technical field

the present invention relates to a kind of oil pipeline steel.

Background technology

oil pipeline steel is to be used for the used special steel grades of fluid circuit such as transfer oil.Because abominable physical environments such as that fluidic pipeline such as transfer oil Sweet natural gas will pass through usually is high and cold, high-sulfur and seabed; So; Good mechanical performance such as require pipe line steel to have high-yield strength, H.T. and can weld also requires to have characteristics such as low temperature resistant and corrosion-resistant simultaneously.For intensity and the toughness that makes steel reaches requirement, when smelting pipe line steel, need in molten steel, add the mass expensive alloy to optimize the performance of steel.In the prior art, generally believe that micro alloying elements such as adding manganese, chromium, molybdenum, nickel, copper, aluminium, titanium, niobium, vanadium just can process optimal pipe line steel, because the carbide of vanadium is the most tiny; It is also the most even to distribute, and make martensite refinement in the tissue, mainly utilizes the crystal grain thinning effect of vanadium; And copper can play the effect of activated cathode in the atomospheric corrosion process; Impel steel to produce anode passivation, thus the corrosion that has slowed down air, and nickel can improve the fusing point of copper; Avoid the generation of " be full of cracks " and " copper brittleness " phenomenon; For this reason, contain vanadium in the oil pipeline steel, copper and mickel is a requisite microalloy element in the prior art, and also be added with the different manganese of content, chromium, molybdenum, aluminium, titanium, niobium etc.Though containing above-mentioned microalloy element, the oil pipeline steel has more satisfactory ys and H.T.; But, because nickel, copper and vanadium all belong to the very expensive metal of price, so; Not only cost is higher to adopt this kind alloying to produce pipe line steel, and resources such as waste nickel, copper and vanadium.

Summary of the invention

task of the present invention provide a kind of utilization cheaply metal make and can satisfy mechanical property and the oil pipeline steel of use properties requirement with the workout cost problem.

oil pipeline steel proposed by the invention is that the material by following weight percent constitutes: carbon 0.02-0.04%; Manganese 1.60-1.65%; Niobium 0.070-0.075%; Titanium 0.011-0.013%; Chromium 0.22-0.27%; Aluminium 0.030-0.035%; Molybdenum 0.11-0.15%; Surplus is iron and unavoidable impurities.Wherein, niobium ability crystal grain thinning promotes acicular ferrite to form, if the content of niobium is unfavorable for that less than 0.070% acicular ferrite forms, and its content is higher than 0.75% meeting increase cost; Manganese has the intensity of raising, toughness in pipe line steel, reduce the effect of ductile-brittle transition temperature; Titanium is the grain coarsening hold back agent, can reduce recrystallize and stop temperature; Chromium can improve the tensile strength and the hardening capacity of pipe line steel; Molybdenum element is a carbide forming element, and compares with soft steel, and molybdenum can more effectively improve hardening capacity in high carbon steel.

Comprise that containing weight percent is: silicon 0.15-0.20% in said impurity; Phosphorus≤0.01%; Sulphur≤0.001%.

said oil pipeline steel is made up of the material of following weight percent: carbon 0.04%; Manganese 1.64%; Niobium 0.074%; Titanium 0.012%; Chromium 0.25%; Aluminium 0.030%; Molybdenum 0.13%; Surplus is iron and unavoidable impurities.

oil pipeline steel proposed by the invention does not add these three kinds of noble metals of nickel, copper and vanadium; And how many amounts of the manganese that is added, chromium, molybdenum, titanium and niobium do not increase; Just utilize the variation of content to improve the intensity and the toughness of pipe line steel, its cost of manufacture can be reduced greatly; From the detected result of this kind pipe line steel performance detection result and metallographic structure, this kind steel is an acicular ferrite type pipe line steel, and ys per square inch reaches 70000 pounds (X70), and carbon content meets the X70 standard of national regulation below 0.04%.

Embodiment:

Embodiment 1:

It is that the LF stove is smelted oil pipeline steel proposed by the invention that ladle refining furnace is adopted in ; The oil pipeline steel that the mode refining of perhaps adopting the LF stove to combine with the RH vacuum circulation degassing method is proposed by the invention; And adds in the LF stove through the material alloying system that is arranged on LF stove top and to finely tune alloy, and make the weight percent of each microalloy in the molten steel be: carbon 0.02%; Manganese 1.65%; Niobium 0.075%; Titanium 0.011%; Chromium 0.22%; Aluminium 0.030%; Molybdenum 0.11%; Surplus is iron and unavoidable impurities.Comprise in the said impurity that containing weight percent is: silicon 0.20%; Phosphorus≤0.01%; Sulphur≤0.001%.

Embodiment 2:

according to the method refining petroleum pipe line steel of embodiment 1, and makes the weight percent of each microalloy in the molten steel be: carbon 0.04%; Manganese 1.60%; Niobium 0.070%; Titanium 0.013%; Chromium 0.27%; Aluminium 0.035%; Molybdenum 0.15%; Surplus is iron and unavoidable impurities.Comprise in the said impurity that containing weight percent is: silicon 0.15%; Phosphorus≤0.01%; Sulphur≤0.001%.

Embodiment 3:

according to the method refining petroleum pipe line steel of embodiment 1, and makes the weight percent of each microalloy in the molten steel be: carbon 0.04%; Manganese 1.64%; Niobium 0.074%; Titanium 0.012%; Chromium 0.25%; Aluminium 0.030%; Molybdenum 0.13%; Surplus is iron and unavoidable impurities.Comprise in the said impurity that containing weight percent is: silicon 0.18%; Phosphorus≤0.01%; Sulphur≤0.001%.

Claims

1. oil pipeline steel is characterized in that: this oil pipeline steel is that the material by following weight percent constitutes: carbon 0.02-0.04%; Manganese 1.60-1.65%; Niobium 0.070-0.075%; Titanium 0.011-0.013%; Chromium 0.22-0.27%; Aluminium 0.030-0.035%; Molybdenum 0.11-0.15%; Surplus is iron and unavoidable impurities.

2. oil pipeline steel according to claim 1 is characterized in that: comprise in the said impurity that containing weight percent is: silicon 0.15-0.20%; Phosphorus≤0.01%; Sulphur≤0.001%.

3. oil pipeline steel according to claim 1 is characterized in that: said oil pipeline steel is made up of the material of following weight percent: carbon 0.04%; Manganese 1.64%; Niobium 0.074%; Titanium 0.012%; Chromium 0.25%; Aluminium 0.030%; Molybdenum 0.13%; Surplus is iron and unavoidable impurities.