Pure steel and carbon steel (carbon steel is divided according to carbon content)

1. The equipment should be kept clean and achieve "four nos" and "six no leaks". "Four nos" means no dust, no debris, no looseness, and no oil pollution; No water leakage, no air leakage, no electricity leakage, no air leakage, no dust leakage. 2. Lubricate the "five determinations" to specify points, timing, quantity, quality and personnel. 3. The six elements of thread refer to tooth type, outer diameter, pitch (lead), number of heads, precision and direction of rotation. 4. The so-called welding specification refers to the electrode diameter, welding current, welding speed and arc length. 5. The main functions of lubricants are lubricating, cooling, anti-rust, cleaning, buffering and damping, and sealing. 6. The matching between the inner diameter of the bearing and the shaft adopts the base hole system, while the matching between the outer diameter of the bearing and the bearing seat adopts the base shaft system. 7. 1/50mm vernier caliper, the total length of 50 divisions on the auxiliary scale is 49mm. 8. The cutting process of steel includes preheating, oxidation and slag blowing. 9. In imperial units, 1 inch = 25.4mm, so 127mm = 5 inches. 10. Carbon steel can be divided into low carbon steel, medium carbon steel and high carbon steel according to the carbon content, of which 45 steel is

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