38B2

Heat analysis; see the source page for footnotes and agreement-based options. An unspecified range is not zero. The early temporary 2001 extraction has been replaced with the 2017 original. The website does not state an edition; this entry shows the edition of its source and does not establish contractual applicability.

ISO 4954:2018; heat analysis, mass fraction %; values without a stated range are upper limits; see the source page for complete table footnotes. The website does not specify the edition; the source edition is shown here and does not establish contractual applicability.

ISO 4954:2018, Table C.3 gives heat analysis; A single value is a maximum; a dash is not zero. ; Product-analysis tolerances are listed separately under Table 2/3 of the standard and do not directly widen the heat-analysis composition ranges. ; Optional Al0.020–0.050% to improve cold-heading performance; this is not a universal mandatory minimum. ; Low Si may be agreed in the order, taking hardenability into account; Where hardenability is required, the standard permits limited deviations, except for P/S; C must not exceed 0.01%; see Table 2 for the other requirements. ; When a Cr maximum of 0.30% is specified, a minimum Cr may be agreed at ordering; 30MoB1 requires guaranteed hardenability, with Cr minimum 0.15% and an upper limit adjustable by agreement.

EN10263-4:2017, Table 4, heat analysis, mass percent. ; Elements not listed shall not be filled as 0; they shall not be intentionally added without the consent of the purchaser, except additions needed to finish steelmaking. ; Note 2 allows the specification of small deviations when hardenability requirements exist, but this does not involve P/S; The default composition range is not expanded here; it must be combined with specific hardenability ordering conditions. ; Note 3 allows Al 0.020–0.050% to be listed separately; it shall not be defaulted as mandatory aluminum content. ; Mechanical properties and delivery conditions are to be verified separately; the standard range is not a guarantee for the forming of arbitrary parts. ; The text of Table 4 Note a indicates that a Cr lower limit may be agreed upon for grades with Cr≤.30%; the table header Footnote a is located at Si; the ambiguity of the original position is retained, and clear Si table values shall not be changed nor low Si conditions arbitrarily set based on this. ; The Cr lower limit of .15 in Table 4 Note b applies only to the core hardenability requirements of 1.5408 (30MoB1) and shall not be applied to other grades such as 30MnB4; Agreement to reduce the Cr upper limit must include a specific limit value.

DIN EN10263-4:2002-02 adopts EN10263-4:2001; the edition relationship is expressly identified on the cover; Heat-analysis mass percentages. ; Historical Table 2/3 contains no optional Al addition note for 2017; newer-edition conditions are not applied. ; Table 2, note c permits an agreed carbon range of width .04%; tabulated defaults are unchanged without a specific agreement. ; Table 2, note d and Table 3, note c permit agreed lower Si, considering effects on properties/hardenability; no range is invented where none is specified. ; Unlisted elements are not entered as zero; Table 2, note a: intentional additions without purchaser consent are prohibited except to finish the heat; residuals may be present but must not impair properties. ; Table 2, note b permits specified deviations where hardenability is required, except for P/S; The default composition range is not widened here. ; Mechanical properties, delivery and hardenability require separate verification; suitability for forming a specific component requires separate confirmation. ; Historical Table 3, note d: minima for grades with Cr≤.30 may be agreed, but no general value is given; the 30MoB1 core-hardening .15 option from 2017 is not copied.