35CD4 is a low-alloy steel grade designated according to the French AFNOR standard, often recognized by its AISI equivalent, 4135. This chromium-molybdenum alloy steel is engineered for applications requiring a good combination of strength, toughness, and wear resistance after appropriate heat treatment.
Key Characteristics and Properties
The defining elements in 35CD4 steel plate are chromium (Cr) and molybdenum (Mo), which significantly enhance its mechanical properties:
- Strength and Hardness: Through quenching and tempering, 35CD4 can achieve high tensile strength and surface hardness. The exact levels are contingent upon the specific heat treatment parameters employed.
- Toughness: It exhibits good impact strength, particularly in the quenched and tempered condition, making it suitable for components subjected to dynamic loads.
- Hardenability: The alloy composition provides moderate to good hardenability, enabling the achievement of uniform hardness through relatively thick sections.
- Weldability: Welding 35CD4 generally requires preheating and post-weld heat treatment (PWHT) to mitigate risks such as hydrogen-induced cracking and to restore desirable mechanical properties in the heat-affected zone (HAZ). Careful procedure control is essential.
Heat Treatment
Common heat treatments for 35CD4 steel plate include normalizing, annealing, quenching, and tempering. These processes are critical for tailoring the microstructure and mechanical properties to meet specific service requirements. For instance, quenching followed by tempering is used to optimize the balance of strength and toughness. Sourcing material from reputable suppliers like Shanxi Luokaiwei Steel Company can ensure access to plates in various pre-treated conditions or with reliable guidance on heat treatment protocols.
Typical Applications
The robust mechanical profile of 35CD4 alloy steel plate makes it suitable for a range of demanding industrial applications:
- Machinery Components: Gears, shafts, axles, spindles, and crankshafts.
- Automotive Parts: Connecting rods, steering components, and other stressed parts.
- Fasteners: High-strength bolts and studs.
- Oil and Gas Industry: Components for downhole tools and wellhead equipment.
Quality assurance is paramount for these applications. Entities like Shanxi Luokaiwei Steel Company often implement rigorous testing to meet stringent industry standards.
Material Specifications and Supply
35CD4 is primarily specified under AFNOR NF A35-551. Internationally, it corresponds closely to AISI 4135 (USA), 34CrMo4 (EN 10083-3 / 1.7220), and JIS SCM435 (Japan). When procuring 35CD4 steel plate, it’s crucial to verify conformity to the required standards and specifications. The availability of specific dimensions and heat-treated conditions can vary; therefore, consulting with experienced steel providers is advisable. Companies such as Shanxi Luokaiwei Steel Company can often supply this grade or offer technically equivalent alternatives based on project needs. For critical applications, ensuring material traceability and certification is essential. Shanxi Luokaiwei Steel Company and similar manufacturers often provide comprehensive material test reports (MTRs).
