Inconel X-750 Nickel-Chromium Alloy Steel

special steel 434036CrNiMo41.6511SNCM439EN24817M40 Alloy Steel optimal manufacturer

According to industry experts, 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel is highly regarded for its combination of high strength, toughness, and versatility. Its ability to be heat treated to different hardness levels makes it suitable for a wide range of applications, from automotive to industrial machinery. With proper heat treatment and machining, this alloy steel offers reliable performance in demanding environments.


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Unveiling the Marvels of 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel: A Comprehensive Exploration


In the expansive realm of metallurgy, certain alloys shine as exemplars of innovation and engineering prowess. Among them stands 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel, celebrated for its remarkable strength, toughness, and adaptability. Join us as we embark on an exploration to unveil the intricacies and merits of this extraordinary alloy, examining its composition, properties, applications, suppliers, pricing, and expert insights.

Overview of 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel

4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel stands out for its exceptional combination of strength, toughness, and versatility, making it highly sought after in various industries.

Chemical Composition

Carbon (C)0.38-0.43%
Chromium (Cr)0.70-0.90%
Manganese (Mn)0.60-0.80%
Phosphorus (P)0.035% max
Silicon (Si)0.15-0.35%
Sulfur (S)0.040% max
Nickel (Ni)1.65-2.00%
Molybdenum (Mo)0.20-0.35%
Iron (Fe)Balance

Mechanical Properties

  • Tensile Strength: 980-1200 MPa
  • Yield Strength: 835 MPa
  • Elongation: 12% (in 50mm)


  • ASTM A29: Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
  • EN 10083-3: Technical delivery conditions for alloy steels
  • JIS G4103: Nickel Chromium Molybdenum Steels

Exploring the Features and Advantages

4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel possesses a plethora of features and advantages that render it a preferred choice in various applications.


  • High tensile strength combined with excellent toughness
  • Good fatigue resistance and impact strength
  • Excellent hardenability and heat resistance
  • Suitable for heat treatment to achieve desired mechanical properties
  • Versatile and adaptable to diverse manufacturing processes


  • Widely used in applications requiring high strength and toughness, such as automotive, aerospace, and machinery components
  • Offers good machinability in the annealed condition
  • Provides excellent wear resistance and dimensional stability in demanding environments
  • Cost-effective compared to some other high-alloy steels

Comparison Between 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel and Competing Alloys

Let’s compare the advantages and disadvantages of 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel with a competing alloy, Alloy X:

Parameter4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy SteelAlloy X
StrengthHighVery high

Applications and Uses

From automotive components to industrial machinery, 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel finds extensive application across diverse industries.

AutomotiveAxles, gears, crankshafts
AerospaceLanding gear components, structural parts
MachineryShafts, gears, couplings
Oil & GasDrill collars, drilling equipment

Navigating Suppliers and Pricing

Sourcing 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel requires careful consideration of reliable suppliers offering quality products at competitive prices.

SupplierPrice Range (per unit)Description/Notes
Special Metals Corp$3.00 – $4.50 per poundSpecializes in alloy steel bars and forgings
Alloy Tech$3.20 – $4.80 per poundOffers a wide range of alloy steel products
Precision Alloys$3.50 – $5.00 per poundProvides customized alloy steel solutions

FAQs about 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel

Q: Can 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel be welded?
A: Yes, this alloy steel can be welded using conventional welding methods, although preheating and post-weld stress relieving may be required for certain applications.

Q: What is the heat treatment process for 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel?
A: The heat treatment process typically involves quenching and tempering to achieve desired mechanical properties, such as hardness and toughness.

Q: What are the common applications of 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel?
A: Common applications include automotive components, machinery parts, and industrial equipment requiring high strength and toughness.

Q: Where can I buy 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel?
A: You can source this alloy steel from reputable suppliers such as Special Metals Corp, Alloy Tech, and Precision Alloys, among others.

Q: What specifications does 4340/36CrNiMo4/1.6511/SNCM439/EN24/817M40 Alloy Steel conform to?
A: This alloy steel conforms to standards such as ASTM A29, EN 10083-3, and JIS G4103, ensuring compliance with stringent quality requirements.

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