39MNB5

Table 3 herein applies to heat (cast) analysis, mass fraction wt%; The permissible deviations for product analysis in Table 4 shall not be directly added to the limits in general Table 3. This document is EN ISO 683-2:2018, adopted without modification and accompanied by the text of ISO 683-2:2016; This record explicitly preserves the identity of EN ISO 683-2-2018 and shall not be called the ISO 2018 edition. Only the chemical composition and source conditions of Table 3 are verified; this does not constitute a guarantee of hardenability, heat treatment, mechanical properties, wire delivery state, or cold heading process. Note a: deviations in heat analysis apply only when hardenability requirements are specified; The deviation in C shall not exceed ±0.01%; P/S is excluded, and the other elements follow Table 4. General Table 3 shall not be automatically relaxed, nor shall H/HH/HL be merged with general grades. Note b: Steel with S increased to approximately 0.10% (including sulfide morphology control) or with the addition of Pb to improve machinability may be requested from the supplier; When S is increased, the upper limit of Mn may be increased by 0.15 percentage points. This agreement is not a default requirement, and approximate values shall not serve as precise automatic limits for this batch; if the Pb range is not listed, values shall not be borrowed from other standards. Original Note: Elements not listed shall not be intentionally added without the consent of the purchaser, except those required to complete the melting process; Elements introduced via scrap steel etc. shall be controlled. An unlisted value must not be assumed to be zero. Si in this row is given only as ≤0.40%, with no lower limit listed; do not supplement with 0.10%; B is retained as 0.0008–0.0050% per the Others column of the original table.

Table 3 herein applies to heat (cast) analysis, mass fraction wt%; The permissible deviations for product analysis in Table 4 shall not be directly added to the limits in general Table 3. This document is EN ISO 683-2:2018, adopted without modification and accompanied by the text of ISO 683-2:2016; This record explicitly preserves the identity of ISO 683-2-2016 and shall not be called the ISO 2018 edition. Only the chemical composition and source conditions of Table 3 are verified; this does not constitute a guarantee of hardenability, heat treatment, mechanical properties, wire delivery state, or cold heading process. Note a: deviations in heat analysis apply only when hardenability requirements are specified; The deviation in C shall not exceed ±0.01%; P/S is excluded, and the other elements follow Table 4. General Table 3 shall not be automatically relaxed, nor shall H/HH/HL be merged with general grades. Note b: Steel with S increased to approximately 0.10% (including sulfide morphology control) or with the addition of Pb to improve machinability may be requested from the supplier; When S is increased, the upper limit of Mn may be increased by 0.15 percentage points. This agreement is not a default requirement, and approximate values shall not serve as precise automatic limits for this batch; if the Pb range is not listed, values shall not be borrowed from other standards. Original Note: Elements not listed shall not be intentionally added without the consent of the purchaser, except those required to complete the melting process; Elements introduced via scrap steel etc. shall be controlled. An unlisted value must not be assumed to be zero. Si in this row is given only as ≤0.40%, with no lower limit listed; do not supplement with 0.10%; B is retained as 0.0008–0.0050% per the Others column of the original table.