Steel name: Spring steel
Brand: 50CrVA
Execution standard: GB/T 1222-2007
Density: 7.85 g/cm ³
Characteristics and Scope of Application:
Good mechanical and processing properties, high hardenability, addition of vanadium refines the grain size of steel, reduces overheating sensitivity, improves strength and toughness, has high fatigue strength, and high yield ratio, but poor weldability and low cold deformation plasticity. It is a type of spring used for high load important springs with larger cross-sections and valve springs, piston springs, and safety valve springs with working temperatures<300 ℃. Generally, the supply specifications of sheet metal are between 1.5 and 10.0mm, mostly in annealed state, while those above 10-30mm are mostly in non annealed state. There are few spot goods in the market, so it is often necessary to order futures. The steel coil is in a hot-rolled state and undergoes spheroidization annealing to reduce hardness in order to create conditions for further processing. The 50CrVA produced by Chongqing Special Steel is usually annealed, eliminating the need for further annealing treatment.
50CrVA spring steel (8 sheets)
Chemical composition:
Carbon C: 0.46-0.54
Silicon Si: 0.17-0.37
Manganese Mn: 0.50-0.80
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.030
Chromium Cr: 0.80-1.10
Nickel Ni: ≤ 0.35
Copper Cu: ≤ 0.25
Vanadium V: 0.10~0.20
Mechanical properties:
Tensile strength σ b (MPa): ≥ 1274 (130)
Yield strength σ s (MPa): ≥ 1127 (115)
Elongation rate δ 5 (%): ≥ 10
Shrinkage rate of cross-section (%): ≥ 40
Hardness: Hot rolled, ≤ 321HB; Cold drawing+heat treatment, ≤ 321HB
  
50crva heat treatment image
Heat treatment specifications and metallographic structure:
Heat treatment specifications: Hot rolled steel is delivered in a heat-treated or non heat-treated state, while cold drawn steel is delivered in a heat-treated state.
Metallographic structure: quenched at 850 ℃± 20 ℃, oil cooled; Temper at 500 ℃± 50 ℃ (± 30 ℃ if necessary).
50crva representation method
① The two digits at the beginning of the steel grade indicate the carbon content of the steel, expressed as a percentage of the average carbon content, such as 40Cr and 25Cr2MoVA alloy tubes. The main alloying elements in steel, except for a few microalloying elements, are generally expressed as a percentage. When the average alloy content is less than 1.5%, the steel grade generally only indicates the element symbol without indicating the content. However, in special cases that may cause confusion, the number "1" can also be marked after the element symbol. For example, steel grades "12CrMoV" and "12Cr1MoV" have chromium content of 0.4-0.6% for the former and 0.9-1.2% for the latter, with all other components being the same. When the average content of alloying elements is ≥ 1.5%, ≥ 2.5%, ≥ 3.5%, etc., the content should be indicated after the element symbol, which can be represented as 2, 3, 4, etc. For example, 18Cr2Ni4WA.
③ Vanadium V, titanium Ti, aluminum AL, boron B, rare earth RE and other alloying elements in steel are all microalloying elements. Although their content is very low, they should still be marked in the steel grade. For example, in 20MnVB steel. Vanadium is 0.07-0.12%, boron is 0.001-0.005%.
④ High quality steel should be marked with "A" in the steel grade to distinguish it from ordinary high-quality steel.
⑤ Special purpose alloy structural steel, with a steel grade prefix (or suffix) representing the symbol for the purpose of the steel grade. For example, the 30CrMnSi steel used for riveting screws is represented by the steel grade ML30CrMnSi.
Dongguan Deno Metal Steel Co., Ltd. is a first tier wholesale agent for steel products in Dongguan, specializing in the sale of various imported high-quality steel products. If you would like to further understand our company's products