Q295A

GB/T 1591—1994, Table 1; Heat-analysis mass fractions wt%. Requirements from other current editions are not backfilled into this edition. V/Nb/Ti/Al in Table 1 are grain-refining elements; 5.1.1.6—8 requires at least one of C/D/E; A/B is optional and, when not added, is neither analyzed nor guaranteed; All four minima must not be imposed simultaneously as default requirements. For all 5.1.1.10 grades, residual Cr/Ni/Cu are each ≤0.30%; Table 1 of Q390/Q420/Q460 separately lists a Cr/Ni limit; interpret it according to whether the element is intentionally added as an alloying constituent. 5.1.1.4 sheet

hot-rolled strip has a thickness exception for the Mn minimum; The Nb minimum for 5.1.1.9 sections and bars is 0.005%; Special forms and contract conditions require manual review. This standard covers high-strength low-alloy structural steels; This does not establish cold-heading wire suitability, actual supply or a default mechanical-property guarantee. Clause 5.1.1.1: delivery may be made with C≤0.18% subject to conditions; Clause 5.1.1.2: when V/Nb/Ti are not intentionally added and C≤0.12%, the Mn upper limit may be 1.80%. Default values in Table 1 do not include these options.