En42J/C80 is a high-quality medium-carbon steel recognized in India for its excellent hardenability and wear resistance. This grade is a workhorse in demanding industrial applications, offering a superior combination of strength and toughness when correctly heat-treated. In India, En42J/C80 is favored by manufacturers across the automotive, tooling, and heavy machinery sectors for components that undergo significant stress and require exceptional durability. Its predictable performance and availability from major domestic producers like SAIL and JSW make En42J/C80 a preferred choice for procurement engineers and fabricators seeking reliable material solutions. The specific "J" designation often implies closer control over properties compared to standard C80 grades, further enhancing its value in critical applications.
Chemical Composition of En42J / C80
| Element | % Range |
| Carbon (C) | 0.75 - 0.85 |
| Manganese (Mn) | 0.60 - 1.00 |
| Silicon (Si) | 0.10 - 0.40 |
| Phosphorus (P) | Max 0.050 |
| Sulphur (S) | Max 0.050 |
Mechanical Properties of En42J / C80
| Property | Value (Approximate, as-rolled/annealed) | Value (Approximate, hardened & tempered, e.g., 55 HRC) |
| Ultimate Tensile Strength (UTS) | 600-750 MPa | 1000-1400 MPa |
| Yield Strength (YS) | 350-500 MPa | 800-1200 MPa |
| Elongation at Break | 10-15 % | 5-10 % |
| Hardness (Brinell) | 170-220 HB | 480-550 HB |
| Hardness (Rockwell C) | - | 48-57 HRC |
| Density | 7.85 g/cm³ | |
| Modulus of Elasticity | 200-210 GPa | |
Note: Mechanical properties for En42J / C80 are highly dependent on the heat treatment applied.
Available Forms in India
| Shape | Typical Sizes | Standard Length |
| Round Bars | 10mm - 100mm diameter | 6 meters |
| Square Bars | 20mm x 20mm to 80mm x 80mm | 6 meters |
| Wire Rod | 5.5mm - 16mm diameter | Coils |
| Flat Bars | 5mm x 25mm to 50mm x 100mm | 6 meters |
| Forged Billets | Customizable up to 300mm | As per order |
En42J / C80 is commonly supplied in the cold-drawn or hot-rolled condition. Availability in specific sizes and forms should be confirmed with suppliers in India.
Real-world Applications
- Automotive: En42J / C80 is used for manufacturing crankshafts, camshafts, and connecting rods requiring high strength and wear resistance.
- Tooling: This grade finds application in making chisels, punches, and shear blades due to its excellent hardness and toughness.
- Industrial Machinery: C80 steel is employed for components like gears, spindles, and shafts in heavy machinery where durability is paramount.
- Construction: Used for high-strength pins, bolts, and fasteners subjected to significant stress.
- Agriculture: En42J / C80 components like plowshares and cultivator blades benefit from its wear resistance.
- Forging: Widely used as a base material for various forged components requiring medium carbon steel properties.
Machinability & Weldability
The machinability of En42J / C80 steel varies significantly with its heat treatment condition. In the annealed or normalized state (typically Brinell hardness 180-220), En42J/C80 can be machined using standard high-speed steel or carbide tooling. Recommended cutting speeds for turning and milling are moderate, generally around 20-30 m/min. However, in its hardened and tempered condition (e.g., 50-60 HRC), machining becomes difficult, and grinding is the primary method for achieving precise dimensions and surface finishes. For machining hardened En42J/C80, carbide tools with slower speeds (5-15 m/min) and ample coolant are essential. Weldability of En42J / C80 is considered fair to poor due to its medium-high carbon content, which increases the risk of hydrogen-induced cracking in the heat-affected zone (HAZ). Welding should be avoided if possible, or carefully planned. If welding is necessary, preheating to 200-300°C and using low hydrogen electrodes (e.g., E7018 or low-alloy types) is recommended. Post-weld heat treatment (PWHT), typically involving a stress-relieving anneal at 550-650°C, is crucial to mitigate residual stresses and improve the toughness of the weldment in En42J/C80. MIG or TIG welding with appropriate filler metals can be used.Heat Treatment & Processing
En42J / C80 steel is adept at responding to heat treatment, which is essential for unlocking its full potential. For hardening, parts are typically heated to a temperature range of 780-830°C, followed by quenching in oil or water to achieve a martensitic structure. The specific quenching medium depends on the section size and desired level of hardness; water provides faster cooling but increases the risk of distortion or cracking compared to oil for En42J/C80. Tempering is performed after hardening to reduce brittleness and impart toughness. The tempering temperature for En42J/C80 typically ranges from 450°C to 650°C, with lower temperatures yielding higher hardness and strength, while higher temperatures increase ductility and reduce hardness. For example, tempering at 500°C might result in ~52 HRC, while tempering at 600°C could yield ~45 HRC. Annealing of En42J/C80 is performed at 800-850°C, followed by slow furnace cooling, to soften the steel for subsequent machining or cold forming. Normalizing, usually conducted around 840°C with air cooling, refines the grain structure and provides a more uniform microstructure than hot-rolling, preparing En42J/C80 for hardening. Stress relieving can be done at 550-650°C.Sourcing in India
En42J / C80 steel is a readily available grade from major Indian primary producers such as Steel Authority of India Limited (SAIL), JSW Steel, and Jindal Steel & Power Ltd., as well as numerous secondary manufacturers and re-rollers. Key industrial markets like Mumbai, Pune, Chennai, and Ahmedabad maintain substantial stock levels, ensuring prompt availability for fabricators nationwide. Minimum Order Quantities (MOQs) typically start from 1 metric ton for standard bar sizes, although smaller quantities may be sourced from distributors. The price band for En42J / C80 generally ranges between INR 70 to 95 per kilogram, fluctuating with market dynamics, raw material costs, and order volume. Indian suppliers routinely provide Material Test Certificates (MTC) as per IS 1570-1961 or equivalent international standards, detailing the chemical composition and mechanical properties of the supplied En42J / C80 batch. Ultrasonic testing (UT) and other non-destructive tests (NDT) can be arranged upon specific customer requests, often at an additional cost.International Equivalents
| IS | ASTM | EN | JIS | DIN | GOST |
| C80 | 1080 | C80E2 / 1.1635 | S80C | 1.1645 | 50GrC |
| - | - | Ck80 / 1.1186 | - | - | - |
FAQs about En42J / C80
What is En42J / C80 steel and what are its key characteristics?
En42J/C80 is a medium-high carbon steel known for its excellent balance of strength, hardness, and wear resistance after heat treatment. It is commonly used in India for applications like tools, gears, and automotive components that demand durability and performance under stress. Its hardenability allows it to achieve good mechanical properties, making En42J/C80 a reliable choice for demanding industrial uses.
What are the recommended heat treatment procedures for En42J / C80 steel?
For En42J/C80, typical heat treatment involves hardening by heating to 780-830°C followed by quenching in oil or water, and then tempering at 450-650°C depending on the desired hardness and toughness. Annealing can be performed at 800-850°C for softening. Normalizing is usually done around 840°C. These processes are critical for achieving the optimal properties of En42J/C80.
What are the typical industrial applications of En42J / C80 steel in India?
Common applications in India for En42J/C80 include manufacturing of tools like shear blades and punches, high-strength gears, camshafts, crankshafts, and wear-resistant machine parts. Its suitability for forging and subsequent hardening makes En42J/C80 a versatile material for sectors ranging from automotive to general engineering.
How is the machinability and weldability of En42J / C80 steel?
The machinability of En42J/C80 in its hardened state is poor, requiring specialized tools and slower speeds. However, in its annealed or normalized condition, it is reasonably machinable. Grinding is often the preferred method for finishing hardened En42J/C80 components. Weldability is generally considered poor, and preheating and post-weld heat treatment are often necessary for successful welding of En42J/C80.
Where can I source En42J / C80 steel in India, and what are the typical sourcing conditions?
Yes, En42J/C80 is readily available from major Indian steel manufacturers like SAIL, JSW, and Jindal, as well as various secondary producers. It is commonly stocked in major industrial hubs such as Mumbai, Pune, and Chennai. Typical Minimum Order Quantities (MOQs) can range from 1 to 5 metric tons, with price bands varying based on market conditions and specific product form, often falling between INR 70-95 per kg. MTC (Material Test Certificate) is generally provided as standard.