ML25

GB/T28906-2025 Table 3: Hot-rolled wire rod of quenching-and-tempering-type cold-heading steel; heat analysis, mass fraction %.. ; Note a: Aluminum may be added to improve cold-heading performance, with Alt≤0.060%; this option does not make addition mandatory by default.. ; Note b: Through negotiation between the supplier and the buyer, Si may be lower than 0.10%; In this case, aluminum must be added and Alt≥0.020%.. This record defaults to the Si range listed in the table; do not arbitrarily fill in when no specific low-silicon agreement range is given. ; Note c: For the first 11 grades in Table 3, Cr may be added by agreement to improve hardenability and mechanical properties; the addition amount must be confirmed by both parties; When no agreement is provided, residual Cr ≤ 0.20% according to 7.1.5. ; 7.1.5 Residual Cr, Ni, and Cu are each ≤ 0.20%, and residual Sn ≤ 0.06%; The residual Cr upper limit is not applicable when Cr has a listed alloy range in the table. ; 7.1.7 Unless otherwise specified in the table, the permissible deviation of the finished product chemical composition shall be according to GB/T222; heat analysis values shall not be substituted for finished product tolerances. ; The original text applies to 5–52mm hot-rolled wire rod for cold heading; specific product specifications, supply, and processing routes still need to be confirmed; Mechanical properties to be verified separately.

Table 3 Heat analysis, mass fraction %. ; 6.1.5 residual Cr/Ni/Cu are each ≤0.20%; Listed alloy Cr is not subject to residual Cr limits. ; 6.1.7 composition tolerances follow GB/T222; Do not treat heat analysis limits as product analysis tolerances. ; Table 3 of the 2012 edition does not have the optional aluminum and low silicon footnotes of the 2025 edition; new edition conditions shall not be applied. ; Clause 6.4.2: Steel types intended for quenching and tempering normally do not require mechanical-property testing.; If requested by the purchaser, agree the property values for the hot-rolled condition or heat-treated test specimens and state them in the contract; do not invent uniform guaranteed values..

Table 3: Heat analysis of quenching-and-tempering-type steels for cold heading and cold extrusion; mass fraction %.. ; 6.1.5 Residual Cr/Ni/Cu each ≤0.20%; the residual Cr limit shall not be used when an alloy Cr range is specified. ; 6.1.7 Permissible deviations of finished product composition shall be in accordance with GB/T222; This record does not widen the default heat-analysis limits by applying product-analysis tolerances.. ; Table 3 of this edition does not specify optional Al or a unified low Si agreement; conditions of GB28906-2025 shall not be applied. ; Unspecified elements such as Mo shall not be assumed zero; Specific product forms, delivery, mechanical properties, and applicability to part forming still require separate verification.

GB/T6478-2001, Table 3, heat analysis wt%; 6.1.4 residual Cr/Ni/Cu are each ≤.20%; alloy Cr ranges are not subject to the residual maximum. ; 6.1.8 product-analysis tolerances require separate verification under GB/T222-1984, Table 2, and do not widen the default heat-analysis range. ; Actual 2001 edition; Composition from editions 2015 or 2025 is not substituted for this edition; specific dimensions and delivery mechanical properties require separate verification.

Baosteel BEXG 021-2020, Table 1, row 40, PDF page 6; heat-analysis composition in wt%, hot-rolled wire rod. 2020 is the original edition available locally, with no claim that it is the company’s current latest edition. Special conditions and actual supply require separate confirmation.

Give priority to the published technical page on the Creation Group website. Use local reference ranges only as supplementary composition cross-checks; the applicable standard for that product page, the technical agreement and actual verification take precedence.