What is 31CrMoV9 Steel

31CrMoV9 is a high-quality, chromium-molybdenum-vanadium alloyed engineering steel known for its strength, durability, and versatility in various industrial applications. Th31CrMoV9 steel is designed to meet the demands of high stress and extreme conditions. The features make it an ideal choice for components requiring high tensile strength and toughness. Its unique chemical composition ensures excellent hardenability, while the element vanadium contributes to its high fatigue resistance, and makes 31CrMoV9 a preferred material for critical engineering applications.

DIN 31CrMoV9 steel 1.8519 STEEL, OTAI is your best supplier for this 31crmov9 alloy steel.

Supply Range of 31CrMoV9 Alloy Steel

31CrMoV9 is available in round bar and plate:

  • Round Bar: Diameter range from 16mm to 300mm.
  • Steel Plate: Thickness range from 20mm to 200mm.

Relevant 31CrMoV9 Specification and Equivalent Steel Grades

Steel Grade Specifications Equivalent Grades
31CrMoV9 EN 10085 1.8519, 34CrAlMo5-10, 34CrAlNi7-10

31CrMoV9 Material and Equivalent’s Chemical Composition

Element 31CrMoV9 (%) 34CrAlMo5-10 (%) 34CrAlNi7-10 (%)
C 0.27-0.34 0.30-0.37 0.30-0.37
Cr 2.30-2.70 1.0-1.30 1.50-1.80
Mo 0.15-0.25 0.15-0.25 0.15-0.25
V 0.10-0.20 – –
Si max 0.4 max 0.4 max 0.4
Mn 0.40-0.70 0.40-0.70 0.40-0.70
S max 0.035 max 0.035 max 0.035
P max 0.025 max 0.025 max 0.025

31CrMoV9 Steel Properties

31CrMoV9 Alloy Steel is esteemed for its exceptional mechanical properties, including:

Tensile strength Rm 900 – 1100 N/mm2
Brinell hardness 284 – 346 HB
Yield strength Rp0.2 > 700 N/mm²
Strain > 11 %
Fracture reduction > 45%

Forging of 31CrMoV9

Forging of 31CrMoV9 steel should be done between 1050°C to 850°C, followed by cooling in the furnace or in air. This process enhances its mechanical properties by refining the steel’s microstructure.

Heat Treatment of 31CrMoV9

For steel 1.8519, the heat treatment involves several steps to optimize its mechanical properties.

  • Initially, it undergoes soft annealing between 680°C and 720°C, allowing for slow cooling to achieve a specific hardness.
  • Hardening is performed at higher temperatures, between 840°C and 880°C, utilizing oil or water for quenching.
  • The tempering process follows, conducted between 570°C and 680°C, with air cooling to adjust the steel’s hardness and strength.
  • Finally, stress relieving is recommended after mechanical processing to mitigate residual stress, recommended within a specific temperature range.

Application of 31CrMoV9

31CrMoV9 finds its application in areas requiring high strength and endurance against wear and fatigue. Common applications include:

  • Automotive components
  • Gear and engine parts
  • High-strength bolts and fasteners
  • Components for the oil and gas industry

Why Choose Otai for 31CrMoV9

Choosing Otai Special Steel for 31CrMoV9 means opting for reliability, quality, and unmatched expertise. Our advantages include:

  1. Adherence to ISO 9001 quality systems with rigorous internal quality control.
  2. A comprehensive stock of popular materials for quick delivery and 31CrMoV9 is available in stock.
  3. Competitive pricing and flexible payment terms. Send us inquiry and best offer would be sent to you within 12 hours or on the same day.
  4. Experienced sales teams serving clients globally, ensuring the supply of high-quality 31CrMoV9 as per your specifications.

In conclusion, 31CrMoV9 is an engineering steel that combines durability, strength, and versatility. Otai Special Steel is your go-to supplier for high-quality 31CrMoV9, offering expert guidance and fast, reliable service. Whether you’re a distributor, end user, or trading company, we’re here to meet your needs with excellence.

FAQs

  1. What makes 31CrMoV9 suitable for high-stress applications?
    • Its unique combination of chromium, molybdenum, and vanadium offers high strength, toughness, and fatigue resistance.
  2. Can 31CrMoV9 be welded?
    • Yes, with precautions to avoid thermal stress.
  3. What is the typical heat treatment process for 31CrMoV9?
    • Quenching and tempering (Q+T) are recommended to achieve optimal mechanical properties.
  4. How does 31CrMoV9 compare to other engineering steels?
    • It offers superior strength and toughness, especially in quenched and tempered conditions.
  5. How can I order 31CrMoV9 from Otai Special Steel?