The hardness of black carbon steel pipe can be affected by many different factors, including carbon exposure, the amount and type of other elements in the alloy, and the specific process used to make the steel. Mild steel contains 0.05% to 0.25% carbon and is typically the softest variety, but can be hardened through a process called carburization. Ultra-high black carbon steel pipe can be composed of up to 2% carbon and is generally the hardest type, although the final hardness of each product is also determined by various heat treatment processes. The quenching process can increase the hardness of black carbon steel pipe by about four times, although subsequent tempering usually reduces the hardness.
Black carbon steel pipe is an alloy composed primarily of iron and carbon. Other elements may also be present, usually in very small amounts. The exact makeup of black carbon steel pipe has several different definitions, although elements such as silicon and copper typically make up less than 0.6% of various alloys. Some black carbon steel pipe alloys can also contain up to 1.6% of elements such as manganese. Since there are many different alloys commonly referred to as black carbon steel pipe, each type tends to have a different hardness.
What factors affect the hardness of black carbon steel pipe?
The main factor that affects the hardness of black carbon steel pipe is the amount of carbon present in the alloy. Mild steels tend to be the softest, while ultra-high black carbon steel pipes can be very hard and brittle. The physical properties of black carbon steel pipe can also be changed through various treatments to increase or decrease hardness.
Although mild steel is relatively soft, a process called carburization causes it to become harder. This heat treatment process actually causes the alloy to absorb additional carbon from solid, liquid, and gaseous sources such as charcoal and carbon monoxide. Carbon is usually only absorbed into the surface of the metal, which results in a case-hardened outer layer and a softer ductile core.
High carbon content steels tend to be difficult to start with, but the quenching process makes them even more difficult. If a black carbon steel pipe alloy is too hard, it will often also be brittle. Some particularly hard alloys actually go through a quenching and tempering process that reduces the hardness of black carbon steel pipe and increases its ductility. Other processes, such as annealing, can also effectively increase ductility and reduce the overall hardness of the steel.
Article source: https://article-realm.com/article/Business/53368-Factors-affecting-the-hardness-of-black-carbon-steel-pipe.html
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