Specification for carbon steel pipes and tubes with specified room temperature properties for pressure purposes

Two alloys of steel containing nominally 0.45C-1.0Si-2.0Mn-0.8Al and 1.2Al were cast in open air induction furnace. Dilatation testing was carried out to recognize the effect on Aluminum on the different critically transformation temperatures. The alloys were hot forged at 1200°C and then subjected to different cooling rates. Mechanical testing was carried out at room temperature. Optical and SEM microstructure were observed. X-ray diffraction was conducted to observe the microstructure constituents.

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Inhibitive Effect of Fatty Amide and Secondary Species on the Corrosion of Carbon Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1133.366 ◽

2016 ◽

Vol 1133 ◽

pp. 366-370 ◽

Cited By ~ 1

Author(s):

Izni Mariah Ibrahim ◽

Junaidah Jai ◽

Md Amin Hashim

Keyword(s):

Carbon Steel ◽

Room Temperature ◽

Inhibition Efficiency ◽

Static Condition ◽

Fatty Amide ◽

Nacl Solution ◽

Inhibition Effect ◽

Linear Polarization Resistance ◽

Atomic Force ◽

Polarization Resistance Method

The effect of hydrazine, N2H4 in the presence of fatty amide as corrosion inhibitor on corrosion of carbon steel in 3.5 wt% NaCl solution was studied by linear polarization resistance method (LPRM) at room temperature and static condition. The specimens’ surface analysis was done using atomic force microscope (AFM). The inhibition efficiency improved to more than 80% when 500, 100 and 2000 ppm of hydrazine were added to the inhibited solution containing 20 ppm fatty amide. The results obtained show that the inhibition effect is increased with increase of hydrazine concentration in inhibited solution. It indicates that hydrazine retards the reduction of oxygen in the corrosion process by reacting with dissolved oxygen in the solution and thus, further it reduces the corrosion rate of carbon steel.

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EFFECTS OF TEMPERATURE ON MILD STEEL GRADIENT-DISTRIBUTED WBE IMMERSED IN 3.5 wt.% NaCl SOLUTION

Surface Review and Letters ◽

10.1142/s0218625x21500141 ◽

2021 ◽

pp. 2150014

Author(s):

QINGDONG ZHONG

Keyword(s):

Carbon Steel ◽

Electrochemical Method ◽

Room Temperature ◽

Nacl Solution ◽

Corrosion Medium ◽

Different Temperatures ◽

Effects Of Temperature ◽

Temporal And Spatial ◽

Wire Beam Electrode ◽

Electrode Technique

To study the corrosion behavior of carbon steel in seawater at different temperatures, a novel electrochemical method called gradient-distributed wire beam electrode technique with high temporal and spatial resolution has been employed. This new wire beam electrode was prepared by three kinds of carbon steel with different carbon contents so that it can evaluate three materials simultaneously in the same corrosion medium (3.5[Formula: see text]wt.% NaCl solution) and improve the accuracy of tests results. After the gradient-distributed wire beam electrode soaked in 3.5[Formula: see text]wt.% NaCl solution for 8[Formula: see text]h, compared with measured at room temperature, the corrosion rate was accelerated greatly and polarity reversal of potential-current was also observed.

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