ML20

Clause 6.1.1 of GB/T5953.1/.2:2009 follows the relevant standards identified in the contract; This is reference composition for the same designation under GB/T6478; the applicable standard must be confirmed by contract, and these values are not directly treated as mandatory composition under 5953. No edition is stated on the website; Displayed under this source edition; contract applicability is not established

Mass percent, heat analysis, GB/T28906-2025 Table 1. ; 7.1.5 residual Cr/Ni/Cu are each ≤0.20% and Sn≤0.06%; tabulated alloy Cr is not subject to the residual maximum; 7.1.7 product-analysis tolerances follow GB/T222 and must not be directly treated as heat-analysis limits. ; The standard scope for hot-rolled cold-heading wire rod does not replace confirmation of actual supply dimensions and the component manufacturing process; Mechanical properties require separate verification. ; Table 2, note a: the four grades in Table 1, item 8–11 also apply to case-hardening types.

GB/T28906-2012, Table 1, heat analysis, mass percent. ; Alt in the table is total aluminum, with requirement ≥0.020% but no maximum; the 2025 maximum or acid-soluble-aluminum replacement conditions are not applied. ; 6.1.5 residual Cr/Ni/Cu are each ≤0.20%; Where Cr is a tabulated alloy range, the residual Cr maximum does not apply; Where Sn is unspecified in the original text, the Sn maximum from a newer edition is not inserted. ; 6.1.7 composition tolerances follow GB/T222; Heat-analysis limits are not treated as product-analysis tolerances. ; The standard scope covers hot-rolled cold-heading wire rod; supply conditions and the actual component process still require confirmation. ; Table 1 of 6.1.3, item 4–11: the eight grades also apply to case-hardening types.

GB/T6478-2015, Table 1, heat-analysis mass percentages. ; 6.1.5 residual Cr/Ni/Cu are each ≤.20%; tabulated alloy Cr is not subject to the residual Cr maximum. ; 6.1.7 product-analysis tolerances follow GB/T222 and do not widen the default heat-analysis range; Where Sn is unspecified, limits from a newer edition are not inserted. ; Specific dimensions, product condition and mechanical-property conditions require separate verification; composition alone does not establish suitability for forming a component. ; Table 2 note: the eight grades in Table 1, item 4–11 also apply to case-hardening types.

GB/T6478-2001, Table 1, 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.