What is EN 351 Case Hardening Steel Flat Bar?
EN 351 Case Hardening Steel Flat Bar is a low carbon alloy steel specifically developed for case hardening applications. This grade contains alloying elements such as chromium, nickel, and molybdenum that enhance its strength, toughness, and wear resistance after heat treatment. The steel is commonly used in the production of machine components that require a hardened surface with a strong and ductile core.
Due to its excellent metallurgical properties, EN 351 Case Hardening Steel Flat Bar is widely used in automotive, machinery, and engineering industries. The steel is suitable for carburizing processes that produce a hardened surface layer while maintaining internal toughness. The product is available in Bright and Black Conditions and is supplied with proper test certification. The size range generally varies depending on industrial requirements, with standard thickness 6 mm to 500 mm and width 20 mm to 1000 mm available in multiple dimensions and lengths typically ranging from 3 meter to 6 meters, although customized lengths can also be supplied according to application needs.
Chemical Composition of EN 351 Case Hardening Steel Flat Bar
The chemical composition of EN 351 Case Hardening Steel Flat Bar provides an ideal balance of hardness, strength, and durability after heat treatment.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.20 Max |
| Silicon (Si) | 0.10–0.35 |
| Manganese (Mn) | 0.60–1.00 |
| Phosphorus (P) | 0.015 Max |
| Sulphur (S) | 0.030 Max |
| Chromium (Cr) | 0.40–0.80 |
| Molybdenum (Mo) | 0.10 Max |
| Nickel (Ni) | 0.60–1.00 |
The presence of alloying elements such as chromium, molybdenum, and nickel improves hardenability, strength, and resistance to wear, making the steel suitable for heavy duty industrial applications.
Equivalent Grades of EN 351 Case Hardening Steel Flat Bar
EN 351 is internationally recognized and has several equivalent grades in different global standards:
| Standard | Equivalent Grade |
|---|---|
| BS 970:1991 | 655M13 |
| BS 970 | EN351 |
| AISI / SAE | 3310 |
| DIN | 20NiCrMo2-2 |
These equivalent grades provide similar mechanical and chemical characteristics, enabling easy global sourcing and compatibility with international specifications.
Applications of EN 351 Case Hardening Steel Flat Bar
Due to its high strength and surface hardening capability, EN 351 Case Hardening Steel Flat Bar is widely used in various engineering and industrial applications.
- Gear blanks and mechanical components
- Structural machine parts
- Industrial equipment components
- Automotive transmission components
- Heavy duty engineering parts
The flat bar shape provides excellent stability and dimensional accuracy, making it suitable for fabrication, machining, and structural engineering applications.
Availability and Customization
EN 351 Case Hardening Steel Flat Bars are available in a wide range of thicknesses 6 mm to 500 mm and widths 20 mm to 1000 mm to meet different engineering requirements. Standard lengths usually range from 3 meter to 6 meters, although customized sizes and lengths can also be manufactured as per specific project needs.
Customized production helps reduce material wastage and increases manufacturing efficiency. These flat bars can be supplied in black, bright, or heat treated conditions depending on the required application.
Industry Applications
Engineering Industry
EN 351 Case Hardening Steel Flat Bars are widely used in engineering industries for manufacturing structural components, gear blanks, and high strength mechanical parts. The steel offers good machinability in the annealed condition and develops excellent surface hardness after case hardening. These properties make it suitable for engineering applications requiring strength and durability.
Automobile Industry
The automotive industry uses EN 351 Case Hardening Steel Flat Bar for producing transmission components, gear parts, and structural mechanical parts. The steel provides high surface hardness after carburizing while maintaining a tough core, which is essential for components operating under heavy mechanical loads.
Machinery Manufacturing Industry
Machinery manufacturers rely on EN 351 Case Hardening Steel Flat Bar for manufacturing machine parts such as plates, support components, and heavy duty engineering structures. The steel offers good machinability before heat treatment and excellent hardness and wear resistance after case hardening, ensuring long service life of machinery components.
Key Features of EN 351 Case Hardening Steel Flat Bar
- Excellent case hardening capability
- High wear resistance after heat treatment
- Tough and durable core for impact resistance
- Good machinability in annealed condition
- Reliable performance in heavy duty applications
Why Choose STEEL MART for EN 351 Case Hardening Steel Flat Bar?
STEEL MART is a trusted supplier of EN 351 Case Hardening Steel Flat Bar with decades of experience in the steel manufacturing industry. Our strict quality control procedures and modern production techniques allow us to deliver steel products that meet international standards.
With over 40 years of experience, STEEL MART has established a strong reputation for supplying high-quality steel products with minimum rejection rates and competitive pricing. Our EN 351 Case Hardening Steel Flat Bar is widely recognized for its durability, performance, and consistent quality. Many of our customers continue to place repeat orders due to our commitment to reliability and customer satisfaction.
Conclusion
EN 351 Case Hardening Steel Flat Bar is a premium alloy steel grade designed for applications requiring a hard wear-resistant surface combined with a strong and tough core. Its excellent hardenability, strength, and durability make it ideal for manufacturing gears, structural machine components, and heavy duty engineering parts. When properly heat treated, the material provides outstanding wear resistance and long service life.
STEEL MART supplies EN 351 Case Hardening Steel Flat Bar in a wide range of sizes and supply conditions, ensuring high quality and reliable performance for engineering, automotive, and machinery manufacturing industries.
FAQs
(1)What is EN 351 Case Hardening Steel Flat Bar mainly used for?
It is mainly used for gear blanks, structural components, machine parts, and heavy duty engineering applications.
(2)Can EN 351 steel be case hardened?
Yes, EN 351 is specifically designed for case hardening processes such as carburizing to achieve a hardened outer surface.
(3)Do you supply EN 351 Flat Bars with a test certificate?
Yes, EN 351 Case Hardening Steel Flat Bars are supplied with a proper mill test certificate.
(4)What sizes are available for EN 351 Flat Bars?
The bars are available in multiple thickness 6 mm to 500 mm and width 20 mm to 1000 mm dimensions with standard lengths from 3 m to 6 m.
(5)Is EN 351 steel suitable for automotive components?
Yes, it is widely used in the automotive industry for transmission parts, gear components, and mechanical structures.
