50CrVA chemical element content (%)


component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
minimum value	0.47	0.17	0.5	-	-	0.8	-	-	-
Maximum value	0.54	0.37	0.8	0.025	0.025	1.1	0.3	0.25	0.1

① The brand with a-mark specified in this standard can only be ordered as high-quality steel, and other brands can be ordered as high-quality steel;
② According to the requirements of the demander, each brand in the table can be ordered according to high-grade high-quality steel (without a) or super grade high-quality steel (all brands), just add a or e mark after the brand (for a brand, remove a first). If the demander puts forward other requirements for the chemical composition of the brand in the table, he can order according to special requirements.
③ The unified number code is listed according to the provisions of gb/t17616. The tail number of high-quality steel is 2, the tail number of high-grade high-quality steel (with steel a) is 3, and the tail number of super grade high-quality steel (with steel E) is 6. Carbon equivalent calculation

50CrVA mechanical properties


Sample diameter d mm	Heat treatment or condition	tensile strength σ b Mpa	Yield point σ s Mpa	Elongation δ %	Reduction of area ψ %	Impact absorbed energy KV2 J
d=25	Quenching + tempering	≥1280	≥1130	≥10	≥40	≤255

Heat treatment system:
Quenching temperature 860 ° C, oil cooling; Tempering temperature 500 °, water cooling, oil cooling
① Allowable adjustment range of heat treatment temperature: quenching ± 15 ° C, low temperature tempering ± 20 ° C, high temperature tempering ± 50 ° C
② The mechanical properties listed in the table are applicable to steel with section size not greater than 80mm. For steel with a size greater than 80 to 100mm, the elongation after fracture, reduction of area and impact absorption energy are allowed to be reduced by 1% (absolute value), 5% (absolute value) and 5% respectively compared with the provisions in the table; For steel with a size greater than 100 to 150mm, the elongation after fracture, reduction of area and impact absorption energy are allowed to be reduced by 2% (absolute value), 10% (absolute value) and 10% respectively compared with the provisions in the table; For steel with a size greater than 150 to 250mm, the elongation after fracture, reduction of area and impact absorption energy are allowed to be reduced by 3% (absolute value), 15% (absolute value) and 15% respectively compared with the provisions in the table;
③ Boron steel can be normalized before quenching, and the normalizing temperature should not be higher than its quenching temperature. Chromium manganese titanium steel can be normalized for the first quenching
④ During the tensile test, no yield can be found on the sample steel, and the yield point cannot be determined σ S, the specified residual elongation stress can be measured σ τ zero point two
⑤ The hardness in the table is the value of Brinell hardness hb10/3000 in the supply state of steel annealing or high temperature temp

50CrVA Spring Steel