AISI. SAE Steel Specification Numbers PDF

AISI and SAE Specification Numbers 1. Which organizations have widely used steel specifications? ​ American Society for Testing Materials (ASTM), Society of Automotive Engineers (SAE), American Iron and Steel Institute (AISI). 2. How do AISI and SAE steel specification numbers differ?...

AISI and SAE Specification Numbers 1. Which organizations have widely used steel specifications? ​ American Society for Testing Materials (ASTM), Society of Automotive Engineers (SAE), American Iron and Steel Institute (AISI). 2. How do AISI and SAE steel specification numbers differ? ​ AISI uses prefixes B, C, D, and E to indicate the manufacturing method of carbon grades. 3. What does the first digit (or the first two digits) in a steel specification number represent? ​ The type of steel. 4. What does '1XXX' indicate in a steel specification number? ​ Plain carbon steel. 5. What does '11XX' indicate in a steel specification number? ​ Plain carbon steel with greater sulfur content for free-cutting. 6. What does '2XXX' indicate in a steel specification number? ​ Nickel steel. 7. What do the last two digits in a four-digit SAE steel specification number represent? ​ The approximate or average carbon content in hundredths of a percent. 8. What is the carbon content of SAE 1030 or AISI C1030 steel? ​ About 0.30% carbon. 9. What does the prefix 'B' in the AISI steel numbering system indicate? ​ Acid Bessemer steel. 10. What does the prefix 'C' in the AISI steel numbering system indicate? ​ Basic open-hearth carbon steel. 11. What does the prefix 'D' in the AISI steel numbering system indicate? ​ Acid open-hearth carbon steel. 12. What does the prefix 'E' in the AISI steel numbering system indicate? ​ Electric-furnace steel (usually alloy). 13. What does a 'B' in the middle of an AISI steel specification number indicate? ​ The presence of boron. 14. What does an 'L' in the middle of an AISI steel specification number indicate? ​ The presence of lead. 15. What does an 'H' at the end of an AISI steel specification number indicate? ​ The material is bought on a hardenability specification. 16. What is the SAE number for plain carbon steel? ​ 10XX. 17. What is the SAE number for free-cutting steel? ​ 11XX. 18. What is the SAE number for manganese steel? ​ 13XX. 19. What is the SAE number for boron steel? ​ 14XX. 20. What is the SAE number for nickel steel? ​ 2XXX. 21. What is the SAE number for nickel-chromium steel? ​ 3XXX. 22. What is the SAE number for heat and corrosion-resistant nickel-chromium steel? ​ 30XXX. 23. What is the SAE number for molybdenum steel? ​ 4XXX. 24. What is the SAE number for molybdenum-chromium steel? ​ 41XX. 25. What is the SAE number for molybdenum-chromium-nickel steel? ​ 43XX. 26. What is the SAE number for molybdenum-nickel steel? ​ 46XX. 27. What is the SAE number for molybdenum-chromium-nickel steel (another variant)? ​ 47XX. 28. What is the SAE number for molybdenum-nickel steel (another variant)? ​ 48XX. 29. What is the SAE number for chromium steel? ​ 5XXX. 30. What is the SAE number for heat and corrosion-resistant chromium steel? ​ 514XX. 31. What is the SAE number for another variant of chromium steel? ​ 53XX. 32. What is the SAE number for chromium-vanadium steel? ​ 61XX. 33. What is the SAE number for nickel-chromium-molybdenum steel? ​ 81XX. 34. What is the SAE number for silicon-manganese steel? ​ 92XX. 35. What is the SAE number for another variant of nickel-chromium-molybdenum steel? ​ 93XX. 36. What is the SAE number for nickel-chromium-molybdenum steel, except 92XX? ​ 94XX. 37. What is the SAE number for another variant of nickel-chromium-molybdenum steel? ​ 95XX. 38. What does Table AT 7 generally show about steel strength and carbon content? ​ Strength increases with carbon content, while ductility decreases. 39. What is the typical use for steel with 10–20 points of carbon in the 10XX group? ​ Tubing, forgings, pressed-steel parts, screws, rivets, and carburized case-hardened parts. 40. What is the benefit of higher sulfur content in the 11XX group of steels? ​ It makes the steel free-cutting and suitable for automatic screw machines. 41. What is the preferred type of steel for case hardening in the AISI system? ​ Open-hearth steels identified by the symbol ‘C.’ 42. What makes 1141 steel different from other 11XX steels? ​ It contains more manganese and is heat-treatable for improved mechanical properties. 43. Are 11XX steels generally suitable for welding? ​ No, they are not usually welded. 44. What are general-purpose steels with 20–30 points of carbon used for? ​ Forged and machined parts, screws, boiler plate, and structural steel. 45. What are steels with 30–55 points of carbon commonly used for? ​ Miscellaneous forged and machined parts, shafts, and frequently heat-treated for better properties. 46. Why are cold-finished steels with 30–55 points of carbon used for shafting? ​ They offer improved mechanical properties through heat treatment. 47. What is the typical use for steels with 60–95 points of carbon?  ​ Tools, springs, and high-strength applications. 48. Why are high-carbon steels (60–95 points) usually heat treated? ​ To achieve high hardness, often to a Brinell hardness of 375 or higher.