What is 4340 low alloy steel?
4340 steel is an ultra-high-strength steel classified a medium-carbon, low-alloy steel. 4340 low alloy steel has high strength, ductility, toughness, creep resistance, and fatigue resistance relative to most other steels. Hardness ranging from 24 to 53 HRC can be achieved, depending on the heat treatment.
Chemical Composition
| % | Iron (Fe) | Nickel (Ni) | Chromium (Cr) | Manganese (Mn) | Carbon (C) | Silicon (Si) | Molybdenum (Mo) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|---|---|
| Minimum | 95.10 | 1.65 | 0.7 | 0.65 | 0.38 | 0.15 | 0.2 | – | – |
| Maximum | 96.27 | 2 | 0.9 | 0.9 | 0.43 | 0.35 | 0.3 | 0.010 | 0.010 |
Mechanical Properties
The mechanical properties of 4340 are highly dependent on the heat treatment. 4340 material can commonly have yield strengths of 740-1860 MPa, tensile strengths of 860-1980 MPa, elongations of 11-23%, and plane strain fracture toughness of 53-110 MPa√m.
Applications of 4340 steel include heavy shafting, fasteners, aircraft, automotive, and hydraulic systems.
Why choose OTAI for 4340 steel supplier
At Otai, our commitment transcends being material handlers. Armed with proprietary technology and a dedication to continuous improvement, every order signifies our commitment to solving your challenges. We welcome your inquiries with open arms, ready to embark on a journey of precision and reliability together.
Elevate your projects with 4340 steel plate precision from Dongguan Otai Special Steel Co Ltd – where excellence is not just a promise but a practice.
Customer Stories
Recently, we received an inquiry from Loogle in Spain, seeking information on the alloy steel grade 4340. After providing a detailed quote, Loogle expressed concerns about the authenticity of the material. At OTAI, we understand the importance of transparency and quality assurance.
In response, we promptly supplied Loogle with the comprehensive Material Test Certificate (MTC) for our 4340 standard steel, assuring him of its authenticity. We encouraged Robin to compare our MTC with alternatives in the market. Emphasizing the importance of not just competitive pricing but also the assurance of genuine quality.
