50CRV

Heat analysis, mass fractions wt%; Product-analysis tolerances are assessed separately under GB/T222 and are not included in this table. ; Table 1, note b: when required by the purchaser and stated in the contract, residual Cu may be ≤0.20%; Default tabulated limit ≤0.25%. ; 6.1.2: oxygen in 40SiMnVBE is ≤0.0015%; oxygen in other alloy spring steels is ≤0.0025%; This limit is not extended to carbon spring steels. ; Unspecified elements do not mean zero; Spring-steel composition does not establish suitability for every cold-headed component; the specific process requires a separate assessment.

The chemical composition currently shown is transcribed from the original GB/T 1222-2016; The original record cites GB /T 1222-2025; that original edition remains unavailable, and differences between editions have not been confirmed. Heat analysis, mass fractions wt%; Product-analysis tolerances are assessed separately under GB/T222 and are not included in this table. ; Table 1, note b: when required by the purchaser and stated in the contract, residual Cu may be ≤0.20%; Default tabulated limit ≤0.25%. ; 6.1.2: oxygen in 40SiMnVBE is ≤0.0015%; oxygen in other alloy spring steels is ≤0.0025%; This limit is not extended to carbon spring steels. ; Unspecified elements do not mean zero; Spring-steel composition does not establish suitability for every cold-headed component; the specific process requires a separate assessment.

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 ordinary 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.

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.

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.