Carbon Steel: Properties, Production, Examples and Applications

• Material Characteristics1：4140 steel pipe is a medium - carbon chromium - molybdenum alloy structural steel. Excellent comprehensive properties can be obtained through quenching and tempering heat treatment. It has a moderate carbon content and contains alloying elements such as manganese, chromium, and molybdenum, featuring high strength, good toughness and wear - resistance, and can also resist corrosion to a certain extent.
• Execution Standards1：It complies with standards such as ASTM A29 and ASME SA - 519, and is also applicable to steel grades such as API 5CT L80 - 1, R95, P110, and Q125. It often needs to pass the API 5CT certification and NACE MR0175 corrosion resistance test.
• Production Process1：The raw materials are smelted in an electric furnace and a refining furnace, and formed by hot - rolling. Heat treatment processes such as normalizing or quenching and tempering can be used to optimize the performance. Finally, it undergoes non - destructive testing such as 100% ultrasonic flaw detection, radiographic testing, and hydrostatic pressure test. Surface treatments such as phosphating and galvanizing can also be carried out.
• Application Fields1：In the oil and gas industry, it is used for oil well casings, drill pipe joints, etc. In the mechanical manufacturing field, it can be used to make gears, bearings, etc. It can also be used for high - pressure reaction vessels in the chemical and energy industries, nuclear power plant pipelines, etc.
• Specification Range1：The outer diameter is usually 48.3 - 762mm, the wall thickness is 4 - 120mm, and the length can be customized according to requirements.
• Mechanical Properties (Quenched and Tempered State)1：The tensile strength is 655 - 1034MPa, the yield strength is 552 - 862MPa, the elongation after fracture is ≥11%, the impact property at - 20℃ is KV8 average value ≥60J, the hardness is 16 - 38HRC, and the reduction of area is ≥35 - 45%.

Carbon Steel Description

Chemical Composition