T/JSGT 007-2021 Wind power-based continuous casting round billet

Scope

Main technical content: (1) Steel grades and chemical composition The steel grades and chemical composition (melt analysis) shall comply with the provisions of Table 3. Table 3: Steel grades and chemical composition Grade Chemical composition (mass fraction) /% CSiMnPSCrNiMoCuAlNbVTi 42CrMo 0.41‚Äď0.45 0.17‚Äď0.37 0.60‚Äď0.80 ‚ȧ0.015 ‚ȧ0.015 1.00‚Äď1.20 ‚ȧ0.300 0.18‚Äď0.25 ‚ȧ0.200 0.020‚Äď0.040 ‚ȧ0.10 ‚ȧ0.10 ‚ȧ0.003 42CrMo4 0.41‚Äď0.45 0.17‚Äď0.37 0.60‚Äď0.90 ‚ȧ0.015 ‚ȧ0.015 1.00‚Äď1.20 ‚ȧ0.18‚Äď0.25 ‚ȧ0.200 0.020‚Äď0.040 ‚ȧ0.10 ‚ȧ0.10 ‚ȧ0.003 Q355NE 0.12‚Äď0.18 0.17‚Äď0.37 1.20‚Äď1.50 ‚ȧ0.015 ‚ȧ0.010 ‚ȧ0.15 ‚ȧ0.20 ‚ȧ0.10 0.020‚Äď0.050 0.02‚Äď0.05 0.02‚Äď0.06 ‚ȧ0.05 Note: 1. The hydrogen content shall not exceed 2 ppm; 2. The oxygen content of 42CrMo and 42CrMo4 shall not exceed 15 ppm, and that of Q355NE and S355NL shall not exceed 20 ppm; 3. The nitrogen content of 42CrMo and 42CrMo4 shall not exceed 70 ppm, and that of Q355NE and S355NL shall be controlled between 60 ppm and 110 ppm; 4. [H] is the hydrogen value measured online after vacuum degassing, and [O] and [N] are the values detected by sampling and testing on the casting billet. 5. Harmful elements As+P+Sb+Sn+Bi shall not exceed 0.035%; 6. It is prohibited to use Ca for deoxidization in 42CrMo and 42CrMo4, and Ca shall not exceed 0.0010%. 7. For grades Q355NE and S355NL, CEV shall be ‚ȧ0.43, and CEQ shall be ‚ȧ0.45. 8. The allowable deviation of the finished chemical composition of continuous casting round billets shall comply with the provisions of GB/T 222. (2) Melting method The round billets shall be melted in converter or electric furnace, and subjected to external refining. (3) Delivery state The round billets can be delivered in the form of continuous casting, or in the form of slow-cooled or annealed after continuous casting. (4) Low-magnification microstr

Development Information

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