CASE HARDENING STEEL
High Core Strength & Hard Surface Case Hardening Steel Round, Square, Flat, Hex Bars & Carburizing Grades
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High Core Strength
High Surface Hardness
Wear & Fatigue Resistant
Carburizing Steel
High Impact Toughness
Ready Stock
CASE HARDENING STEEL SUPPLIER IN MUMBAI
Case Hardening Steel (Carburizing Steel) is engineered for applications demanding extreme surface wear resistance alongside high core toughness and shock resistance. Steel Mart supplies a comprehensive range of Case Hardening Steels including EN 30B, EN 36, EN 36C, EN 39B, EN 351, EN 352, EN 353, EN 354, SAE 8620, 20MnCr5, 15CrNi6, 18CrNi8, 31Ni10Cr3Mo6, 40Ni6Cr4Mo2, 15NiCr1Mo12, 15Ni2Cr1Mo15, and 16NiCr2Mo20 in round bars, square bars, flat bars, hex bars, and forgings for automotive gears, pinions, and machinery shafts.
ROUND BARS
SQUARE BARS
FLAT BARS
HEX BARS
PLATES & SHEETS
CASE HARDENING CLASSIFICATION
TYPES OF CASE HARDENING STEEL
We supply carburizing and case hardening steels categorized by alloy composition for specific core strength and case depth requirements.
NICKEL-CHROMIUM GRADES
- EN353 / EN36 / EN36C / EN39B
- Superior Core Toughness & Fatigue Life
- Heavy Transmission Gears & Pinions
- High Impact & Shock Resistance
MANGANESE-CHROMIUM GRADES
- 20MnCr5 / 16MnCr5
- High Surface Hardness (60–64 HRC)
- Automotive Gearboxes & Lay Shafts
- Superior Wear & Pitting Resistance
NICKEL-CHROM-MOLY GRADES
- SAE 8620 / 18CrNi8 / 15CrNi6 / EN 30B
- Deep Case Depth & High Core Strength
- Heavy Duty Mining, Marine & Aerospace
- Maximum Bending Fatigue Endurance
INDUSTRIAL ADAPTABILITY
APPLICATIONS
Case hardening steel is essential for high-stress gears, transmission shafts, pinions, and heavy-duty machinery.
AUTOMOBILE
CONSTRUCTION
OIL & GAS
RAILWAYS
MARINE
ENGINEERING
POWER PLANTS
HEAVY MACHINERY
GRADE FINDER
CASE HARDENING STEEL GRADES AVAILABLE
Use the options below to filter by standards, search specific grades, and request quick rates.
DATA SHEET
TECHNICAL INFORMATION
Detailed metallurgical data, chemical compositions, mechanical properties, and heat treatment specifications for Case Hardening Steels.
Typical chemical compositions of mainstream Case Hardening Steel grades supplied by Steel Mart:
| Grade | Carbon (C) | Manganese (Mn) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) |
|---|---|---|---|---|---|
| EN353 | 0.14 – 0.20 % | 0.50 – 1.00 % | 0.75 – 1.25 % | 1.00 – 1.50 % | 0.08 – 0.15 % |
| 20MnCr5 | 0.17 – 0.22 % | 1.10 – 1.40 % | 1.00 – 1.30 % | - | - |
| 16MnCr5 | 0.14 – 0.19 % | 1.00 – 1.30 % | 0.80 – 1.10 % | - | - |
| SAE 8620 | 0.18 – 0.23 % | 0.70 – 0.90 % | 0.40 – 0.60 % | 0.40 – 0.70 % | 0.15 – 0.25 % |
| Steel Grade | Core Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Surface Hardness (HRC) |
|---|---|---|---|---|
| EN353 | 750 - 1000 | 590 Min | 13 - 17 | 58 - 63 HRC |
| 20MnCr5 | 1000 - 1300 | 750 Min | 9 - 13 | 60 - 64 HRC |
| 16MnCr5 | 880 - 1180 | 630 Min | 10 - 14 | 58 - 62 HRC |
| SAE 8620 | 700 - 950 | 520 Min | 15 Min | 58 - 62 HRC |
Round Bars: 16 mm to 500 mm diameter in ready stock.
Square Bars: 20 mm to 250 mm A/F (Across Flats).
Hexagonal Bars: 16 mm to 85 mm A/F (Across Flats).
Flat Bars: Thickness 10 mm to 100 mm; Widths up to 350 mm.
Forged Blocks & Rings: Customized forged gear blanks & rings.
We supply Case Hardening Steel products in several finishes depending on manufacturing requirements:
- Black Surface: Hot rolled / forged condition for direct machining and gear cutting.
- Bright Drawn: Cold drawn precision finish with tight tolerance for automatic turning centers.
- Peeled & Ground: Centerless ground finish for precision shafts and gudgeon pins.
Recommended heat treatment profiles for Case Hardening Steel components:
- Carburizing: Heat to 880°C – 930°C in endothermic gas or pack media to achieve target case depth.
- Quenching: Direct oil quench or cool to 820°C – 850°C and quench in oil.
- Tempering: Heat to 160°C – 200°C for 1-2 hours to stress relieve while holding high case hardness.
Main structural applications of Case Hardening Steel:
- Automotive Gears (EN353 / 20MnCr5): Crown wheels, bevel gears, gearbox pinions, timing gears.
- Drive Shafts & Axles (SAE 8620 / 16MnCr5): Heavy vehicle axle shafts, splined shafts, universal joints.
- Industrial Pins & Rollers (EN36 / 17CrNiMo6): Gudgeon pins, cam rollers, bushings, track link pins.
| British / European (BS/EN) | American (AISI / SAE) | German (DIN / W-Nr) | Indian (IS) |
|---|---|---|---|
| EN353 | SAE 8620 | 15NiCr13 / 1.5752 | 15Ni2Cr1Mo28 |
| 20MnCr5 | AISI 5120 | 20MnCr5 / 1.7147 | 20MnCr5 |
| 16MnCr5 | AISI 5115 | 16MnCr5 / 1.7131 | 16MnCr5 |
| EN36 / 655M13 | AISI 3415 | 14NiCr14 / 1.5752 | 13Ni3Cr80 |
STEEL MART ADVANTAGE
WHY CHOOSE STEEL MART
Over 40 years of engineering supply chain leadership in industrial steel materials.
40+ YEARS EXPERIENCE
Decades of metallurgical expertise providing premium metals and forgings since 1986.
READY STOCK
Huge warehouse inventory of standard configurations and diameters for immediate loading.
WORLDWIDE EXPORT
Trusted supplier shipping material batches across European, Middle Eastern, and Asian markets.
FAST DELIVERY
Optimized logistics networks ensuring secure and rapid material transit across India and globally.
NEED HELP SELECTING THE RIGHT CASE HARDENING STEEL GRADE?
Our engineers are here to help you choose the perfect grade for your specific fabrication and mechanical requirements.