MFT8

Mass percent, heat analysis, GB/T28906-2025 Table 5. ; 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 5 Note a: Mo/Ti/B/Al/N and other elements may be added by agreement between both parties according to strength and product-size requirements, with the agreement stated in the contract; do not fill in values where no uniform range is given. ; B at the end of MFT grades indicates a ferrite + bainite structure and does not represent a specified boron content; Do not enter 0 if B is not specified.

GB/T6478-2015, Table 5, 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 5 permits additions such as Cr/B according to strength and size requirements; no general range is given and B is not inserted without a source; The default Cr limit is a residual-content requirement.

GB/T 29087-2012 Table 1 heat analysis mass fraction %, Table 1 lists only three grades: MFT8, MFT9, and MFT10. ; Table 1 Note: Other elements such as Cr and B may be added according to strength level and specification; no unified limits are provided, and these shall not be treated as default composition ranges. ; Table 1 Note: Ni and Cu are residual elements each ≤0.20%, N ≤0.008%; Product permissible deviations shall be verified separately according to GB/T 222. ; This standard specifies hot-rolled wire rod of non-quenched-and-tempered cold heading steel, delivered in the hot-rolled condition; Mechanical properties in Table 2 and cold upsetting conditions in 6.6 shall be verified in conjunction with specifications and contracts. ; Compositions of grades with the same name in versions such as GB/T 6478-2015 and GB/T 28906-2025 shall not be automatically interchangeable.