1. What is a carbon steel seamless pipe?
Answer: A carbon steel seamless pipe is a pipe with no welding seam, made of carbon steel billet through hot rolling, cold drawing or extrusion processes. It has the advantages of high pressure resistance, good toughness and uniform structure.
2. What are the common grades of ordinary carbon steel seamless pipes?
Answer: The common ordinary grades are 10# and 20# carbon steel. They belong to low carbon steel, with low carbon content (0.10%-0.23%), good plasticity and weldability, and are widely used in general industrial fields.
3. What are the high-specification grades of carbon steel seamless pipes and their characteristics?
Answer: Common high-specification grades include 45# (medium carbon steel) and 16Mn (low alloy high-strength carbon steel). 45# has high carbon content (0.42%-0.50%), high strength and hardness but poor weldability; 16Mn contains a small amount of manganese, which improves strength and toughness, and has better comprehensive performance than ordinary carbon steel.
What is the carbon content range of 10# carbon steel seamless pipe?
Answer: The carbon content of 10# carbon steel seamless pipe is 0.07%-0.14% (mass fraction), which is a typical low carbon steel.
5. What is the difference in mechanical properties between 20# and 45# carbon steel seamless pipes?
Answer: 20# carbon steel has a tensile strength of 345-490MPa, yield strength of ≥245MPa, and good plasticity and toughness; 45# carbon steel has a tensile strength of 600MPa, yield strength of ≥355MPa, higher strength and hardness, but lower plasticity than 20#.
