Difference between seamless black steel pipe and black iron pipe

Black steel pipe is made of ungalvanized steel. Its name comes from the dark iron oxide coating on its surface in a scaly shape. Because its surface is dyed dark by iron oxide during the manufacturing process, it is called black steel pipe. According to the production process, black steel pipe is divided into two main types: seamless pipe and welded pipe. ASTMA53/A53M is the standard specification for pipes, steel, black and hot-dip galvanized, welded and seamless.

Black iron pipe is an ordinary iron pipe without any surface treatment. Iron pipe is called black iron pipe before galvanizing, and white iron pipe after galvanizing, also known as water pipe and gas pipe. Most houses built before the 1960s used black iron pipe for pipelines such as water pipes and gas pipes. It is a steel pipe, but made of a more ductile material. Black iron pipe, it is actually a steel pipe, but its composition is slightly different, and the material makes it more ductile. However, water does corrode this pipe easily compared to steel pipe.

The difference between steel pipe and iron pipe is the carbon content. The metallurgical industry is usually divided into ferrous metallurgy and nonferrous metallurgy. Many varieties in the charge belong to ferrous metallurgy, mainly including iron, pig iron, steel and iron alloys. In simple terms, black iron pipe is used to transport natural gas and propane gas in residential applications. Black iron pipe steel pipe is seamlessly manufactured, making it a better type for gas transportation and fire sprinkler systems because it can better prevent fire than galvanized pipes.

The commonly used steel is a general term for steel and iron. There is a difference between steel and iron. The so-called steel is mainly composed of two elements, namely iron and carbon. Generally, carbon and elemental iron form a compound called iron-carbon alloy. The carbon content has a great influence on the properties of steel. When the carbon content increases to a certain level, it will cause qualitative changes. The substance composed of iron atoms is called pure iron, and pure iron has very few impurities. The carbon content is the main criterion for distinguishing steel. The carbon content of pig iron is greater than 2.0%; the carbon content of steel is less than 2.0%. Pig iron has a high carbon content, is hard and brittle, and has almost no plasticity. Steel not only has good plasticity, but also steel products have excellent physical and chemical application properties such as high strength, good toughness, high temperature resistance, corrosion resistance, easy processing, impact resistance, and easy refining, so they are widely used.

Black steel pipes and galvanized steel pipes are the two most common types of pipes used to transport liquids and gases. Black steel pipes are more susceptible to corrosion than galvanized pipes, so black steel pipes are often used to transport natural gas, while galvanized pipes are used to transport water. The zinc layer covering the galvanized pipe gives it a high corrosion resistance, but over time it can cause minerals to flake off and clog the pipe, which can cause a burst.

Black iron pipe is one of the best gas pipe options available. It is strong, easy to install, corrosion-resistant, and can maintain airtightness. The black coating helps prevent corrosion. Black iron pipes were used for water pipes in the past, but since the advent of copper, CPVC, and PEX, it is more commonly used for gas. There are two reasons why it is an excellent choice for gas pipes. (1) It is strong, and (2) It is relatively easy to assemble. Like PVC, black malleable cast iron uses a system of pipes and fittings that are assembled together by compounds rather than welding. Despite its name, black iron pipe is actually made of a low-grade "mild steel" compound. This makes it much more corrosion-resistant than traditional cast iron pipe. Uses of black iron square pipe include construction, glass curtain walls, machinery manufacturing, agricultural and chemical machinery, shipbuilding, steel structure engineering, automobile chassis, highway railings, etc.