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Our 4340 alloy structural steel is a premium high-strength nickel-chromium-molybdenum material engineered for critical, high-stress applications. This medium-carbon material delivers exceptional hardenability and toughness, maintaining excellent mechanical properties even at elevated temperatures. With approximately 1.8% nickel content, it provides superior impact resistance and fatigue strength compared to standard alternatives, particularly in large sections. It can be precisely heat-treated to achieve very high tensile strength while remaining relatively ductile and resistant to atmospheric corrosion.
Production Route: | EAF+LF+VD ,Forged or Hot Rolled |
Heat Treatment: | Quenched+ Tempered or Annealed |
Hardness: | or acc. to customer requirement |
UT Standards: | Sep 1921 Class3 D/d |
Surface Condition: | Black surface or machined |
Size Range: | |||
Flat | Round | ||
Forged | Thickness: | 150-650mm | Φ200-700mm |
Width: | 400-1600mm | ||
Rolled | Thickness: | 12-200mm | Φ12-250mm |
Width: | 150-2300mm | ||
Chemical Composition | C | Si | Mn | Cr | Mo | P | S | Ni | Cu |
4340 | 0.38~0.43 | 0.15~0.35 | 0.60~0.80 | 0.70~0.90 | 0.20~0.30 | ≤0.035 | ≤0.04 | 1.62~2.00 | ≤0.35 |
1.6582 | 0.30~0.38 | ≤0.40 | 0.40~0.70 | 1.40~1.70 | 0.15~0.30 | ≤0.035 | ≤0.035 | 1.40~1.70 | |
34CrNiMo6 | 0.30~0.38 | ≤0.40 | 0.40~0.70 | 1.40~1.70 | 0.15~0.30 | ≤0.035 | ≤0.035 | 1.40~1.70 | |
SNCM439 | 0.36~0.43 | 0.15~0.30 | 0.60~0.90 | 0.60~1.00 | 0.15~0.30 | ≤0.03 | ≤0.03 | 1.60~2.00 | ≤0.30 |
The deep-hardening characteristics of our SNCM439 steel make it an ideal choice for manufacturing large-diameter parts requiring superior through-hardening. The balanced chemical composition ensures consistent structural integrity, allowing the material to withstand extreme stress without sudden failure. This reliable toughness is essential for heavy-duty components operating under severe mechanical conditions.
Formulated with specific nickel additions, this 36CrNiMo4 alloy steel exhibits remarkable resistance to fatigue and sudden heavy impacts. It significantly outperforms many standard grades in maintaining its shape and function over prolonged periods of cyclical loading. This inherent resilience naturally extends the service life of critical industrial machinery and reduces the frequency of maintenance.
Our high-strength alloy steel retains its robust mechanical properties even when exposed to demanding high-temperature environments. It can undergo advanced heat treatments like quenching and tempering to further enhance its tensile strength profile. The material remains highly ductile and actively resists atmospheric corrosion and mechanical wear, ensuring dependable performance in adverse settings.
The stringent demands of the aerospace industry require materials where operational failure is simply unacceptable. Our 4340 alloy structural steel is frequently utilized in manufacturing critical aircraft landing gear, engine turbine shafts, and various structural airframe components. Its high reliability ensures maximum safety and operational efficiency for modern aviation systems.
In the automotive sector, this alloy serves as the primary material for high-performance, heavy-duty applications. It is extensively applied in crafting commercial axles, strong connecting rods, and high-performance crankshafts. The superior impact resistance guarantees that these vehicular components can endure intense mechanical stress and prolonged vibration without yielding.
For specialized industrial fields, our 1.6511 structural steel provides the necessary durability for subsea equipment, tool joints, and drill collars in oil and gas extraction. Additionally, the defense industry relies on this tough material for fabricating gun barrels and specialized military vehicle parts, prioritizing uncompromising strength and security in the field.
Backed by a massive 1.6 million square meter production facility equipped with advanced 40Tons EBT and large-scale forging presses, we maintain strict control over both quality and production costs. This full industrial-chain capability allows us to supply a consistent, reliable volume of nickel-chromium-molybdenum steel globally. Our operations are carefully designed to meet the rigorous demands of large-scale wholesalers and tool producers.
We ensure uniform excellence through our independent laboratory, fully equipped for chemical, mechanical, microstructure, and UT testing. Every batch of steel undergoes a rigorous four-step quality control procedure, from pre-production scheduling to final pre-shipment warehouse inspection. Our dedicated engineering team meticulously verifies all material properties to guarantee compliance with international specifications.
We operate our own extensive production mill covering 1.6 million square meters, alongside specialized machining and component factories. This allows us to maintain a regular stock of approximately 2000 tons while offering comprehensive material processing services.
We produce and supply materials in strict accordance with GB, DIN, ASTM/AISI, EN, ISO, and JIS standards. Our extensive catalog covers various tool steels, mold steels, and structural alloys to meet diverse regional requirements.
Every product undergoes a comprehensive pre-shipment inspection conducted by our professional quality control group. We apply UT testing to all steel materials, conforming to Sep 1921 Class 3 D/d, C/c, or E/e levels depending on the specific grade.
The minimum order quantity is approximately 25 tons, which equates to one standard shipping container. Clients have the flexibility to mix different types and grades of steel to fulfill this single container requirement.
Yes, we gladly offer material samples at no cost to help clients verify quality and exact specifications. The customer is only responsible for covering the express shipping charges for the sample delivery.
