The alloy steel pipe is one consisting of steel with the addition of several elements that improve their physical, mechanical or special chemical.
These alloys p11 pipe achieve different results depending on the presence or absence of other metals: the addition of manganese gives it greater resistance to impact, tungsten, allows it to withstand higher temperatures. The alloyed steels also allow a greater amplitude in the heat treatment process.
The effects of the alloy are:
Greater resistance and hardness
Greater impact resistance
Greater wear resistance
Greater resistance to corrosion
Greater resistance to high temperatures
In alloy with:
Aluminum: It acts as a deoxidizer for Molten steel and produces a Fine Grain Steel. Example: p22 pipe
Sulfur: It is normally an impurity and is kept at a low level. However, it is sometimes intentionally added in large quantities (0.06 to 0.30%) into p91 pipe to increase the machinability (cut workability) of alloy and carbon steels.
Boron: Increases hardenability (the depth to which a chrome moly pipe can be hardened).
Chrome: Increases the depth of hardening and improves resistance to wear and corrosion. Its addition causes the formation of various chromium carbides that are very hard; however, the resulting api 5l grade b steel is more ductile than steel of the same hardness produced simply by increasing its carbon content. The addition of chromium widens the critical temperature range.
Copper: Improves resistance to corrosion of ss 304 sheet.
Manganese: Basic element in all commercial ss 304L sheet steels; Manganese is added to all steels as a deoxidizing and desulfurizing agent, but if the manganese content is greater than 1%, the steel is classified as a manganese alloy steel. In addition to acting as a deoxidizer, it neutralizes the harmful effects of sulfur, facilitating lamination, molding, and other hot work operations. It also increases the penetration of hardening and contributes to its resistance and hardness. It reduces the critical temperature range of ss 316 sheet.
Molybdenum: Improves the properties of ss 310 plate by heat treatment. Its alloy with steel forms carbides and also dissolves in ferrite to a certain extent, so that it intensifies its hardness and toughness. Molybdenum substantially kills the transformation point. Due to this reduction, molybdenum is ideal for optimizing the hardenability properties in oil or in air. Except carbon, it has the greatest hardening effect and a high degree of toughness. It provides great hardness and resistance to high temperatures.
Nickel: Improves the properties of heat treatment by reducing the hardening and distortion temperature of ss 316l sheet when tempered. Nickel alloy increases the critical temperature level, does not form carbides or oxides. This increases resistance without decreasing ductility. Chromium is often used in conjunction with nickel to obtain the toughness and ductility provided by nickel, and the wear resistance and toughness of chrome.
Silicon: It is used as a deoxidizer and acts as a hardener in alloy steel hastelloy c276 plate. When added to very low carbon steels, it produces a brittle material with low hysteresis loss and high magnetic permeability. Silicon is mainly used in ss 321 plate, along with other alloying elements such as manganese, chromium, and vanadium, to stabilize carbides.
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