26MNB5

Composition based on ISO 4954:2018; the product edition is unspecified, so confirm the edition applicable to the contract.

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.

Mass fraction wt%; Table C.2/C.3 heat analysis; see Table 2 separately for product-analysis tolerances. ; Note a: Al≤0.050% may be added to improve cold heading, but is not mandatory by default. ; Note c: A lower Si or a specified Si range may be requested by agreement; specific agreements have not yet been provided and shall not be filled in arbitrarily. ; When hardenability requirements exist, the small deviations permitted in Table B.6/B.7 must be verified separately according to Table 2 and conditions; the default composition range shall not be expanded. ; Elements not listed must not be intentionally added without purchaser consent, except additions needed to finish steelmaking; Unspecified values are not treated as zero. ; Mechanical properties/hardenability have not been supplemented in this batch; Cold heading applicability must be determined in conjunction with dimensions, state, and technical conditions. ; Note e: Boron should be in solid solution; non-effective boron impairs toughness and should be avoided; Effective boron cannot be proven solely by the total boron range. ; Note f: When the Cr upper limit is specified as 0.30, a higher lower limit may be separately agreed; it shall not be entered if not provided in the actual agreement; Certain applications of 30MnB4 have a separate 0.15 lower limit requirement, which shall not be applied to other grades in this batch.

A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.

A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.