40CRNI2MOA

Official GB/T38809-2020 cover PDF1, PDF5 Table 2 and footnote a/b, heat-analysis mass fractions wt%. ; Product-analysis tolerances follow Table 3 and GB/T222 separately; they are not added to the default heat-analysis range. ; Steel-bar application, steelmaking, delivery condition, specimen heat treatment and mechanical requirements must be confirmed separately; This does not automatically establish a cold-heading product or supply guarantee.

GB/T 3077-2015 Table 1 gives ladle analysis; Table 2 gives P/S and residual-element requirements. The final note to Table 1 allows ordering any grade as higher or special quality by adding A or E after the grade; this record is higher-quality steel. For steel used in hot-pressure working, Cu ≤0.20%; the ordinary Cu maximum does not apply to this use. Explicit alloy ranges in Table 1 take priority; for Cr/Ni/Mo not specified there, use the residual limits in Table 2 and do not add residual limits on top of alloying-element ranges. Sn/Sb/As must be analyzed and recorded on the inspection certificate; any needed limits require agreement, and no generic numerical limits are invented here. Product-analysis deviations are handled separately under GB/T 222 and do not directly expand ladle limits. Mechanical properties depend on specimen dimensions and the recommended heat-treatment/delivery condition; this composition review does not constitute verification of properties.

Official GB/T38809-2020 cover PDF1, PDF5 Table 2 and footnote a/b, heat-analysis mass fractions wt%. ; Product-analysis tolerances follow Table 3 and GB/T222 separately; they are not added to the default heat-analysis range. ; Steel-bar application, steelmaking, delivery condition, specimen heat treatment and mechanical requirements must be confirmed separately; This does not automatically establish a cold-heading product or supply guarantee.

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.