NITRIDING STEEL
Ultra-High Surface Hardness & Wear Resistant Nitriding Steel Round, Flat, Hex Bars & Extruder Barrel Grades
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Ultra-High Surface Hardness
Zero Quench Distortion
Superior Abrasion Resistance
High Fatigue Strength
Hot Hardness Retention
Ready Stock
NITRIDING STEEL SUPPLIER IN MUMBAI
Nitriding Steels are specialized alloy steels formulated with nitriding elements (Aluminium, Chromium, Molybdenum, Vanadium) that absorb nitrogen during low-temperature gas or plasma nitriding (500°C–550°C). This produces an extremely hard outer case (up to 1100 HV / 68-72 HRC) with virtually zero thermal distortion. Steel Mart is a leading stockist and supplier of Nitriding Steel grades EN41B (905M39), EN40B (722M24), 31CrMoV9, and 41CrAlMo7 in round bars, flat bars, and forged blocks for plastics machinery, extruder screws, crankshafts, and valve stems.
ROUND BARS
SQUARE BARS
FLAT BARS
HEX BARS
PLATES & SHEETS
NITRIDING CLASSIFICATION
TYPES OF NITRIDING STEEL
We supply nitriding alloy steels categorized by alloying elements for specific surface hardness and core toughness requirements.
CR-AL-MO GRADES
- EN41B / 905M39 / 1.8509
- Ultra-High Hardness (1000–1150 HV)
- Extruder Screws & Barrels
- Maximum Abrasion & Wear Resistance
CR-MO GRADES
- EN40B / EN29B / 722M24
- High Core Strength & Ductile Case
- Motorsport Crankshafts & Connecting Rods
- High Impact & Fatigue Resistance
CR-MO-V & NI-CR-MO GRADES
- 31CrMoV9 / 30CrNiMo8 / 21CrMoV5-7 / 20CrMoVTiB
- High-Temperature Creep & High Fatigue Life
- Turbine Rotors, Fasteners & Heavy Gears
- Stable at Elevated Temperatures (up to 580°C)
INDUSTRIAL ADAPTABILITY
APPLICATIONS
Nitriding steel is widely utilized in high-wear plastics machinery, high-RPM automotive engines, power generation turbines, and precision hydraulics.
AUTOMOBILE
PLASTICS MACHINERY
OIL & GAS
AEROSPACE
MARINE
ENGINEERING
HYDRAULICS
HEAVY MACHINERY
GRADE FINDER
NITRIDING 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 nitriding heat treatment specifications.
Typical chemical compositions of mainstream Nitriding Steel grades supplied by Steel Mart:
| Grade | Carbon (C) | Manganese (Mn) | Chromium (Cr) | Molybdenum (Mo) | Aluminium (Al) / Vanadium (V) |
|---|---|---|---|---|---|
| EN41B (905M39) | 0.35 – 0.45 % | 0.40 – 0.70 % | 1.40 – 1.80 % | 0.15 – 0.25 % | Al: 0.90 – 1.30 % |
| EN40B (722M24) | 0.20 – 0.28 % | 0.45 – 0.70 % | 2.90 – 3.50 % | 0.45 – 0.70 % | - |
| 31CrMoV9 (1.8519) | 0.28 – 0.35 % | 0.40 – 0.70 % | 2.30 – 2.70 % | 0.15 – 0.25 % | V: 0.10 – 0.20 % |
| 41CrAlMo7-10 (1.8509) | 0.38 – 0.45 % | 0.40 – 0.70 % | 1.50 – 1.80 % | 0.20 – 0.35 % | Al: 0.80 – 1.20 % |
| Steel Grade | Core Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Nitrided Surface Hardness |
|---|---|---|---|---|
| EN41B (905M39) | 850 - 1000 | 680 Min | 14 Min | 1000 - 1100 HV (68-72 HRC) |
| EN40B (722M24) | 900 - 1050 | 730 Min | 15 Min | 750 - 850 HV (62-65 HRC) |
| 31CrMoV9 | 950 - 1150 | 750 Min | 12 Min | 800 - 900 HV (64-67 HRC) |
| 41CrAlMo7-10 | 900 - 1100 | 700 Min | 13 Min | 950 - 1050 HV (67-70 HRC) |
Round Bars: 16 mm to 450 mm diameter in ready stock.
Square Bars: 20 mm to 200 mm A/F (Across Flats).
Flat Bars: Thickness 15 mm to 120 mm; Widths up to 400 mm.
Forged Blocks & Barrels: Custom bored and forged blocks for extruder barrels.
We supply Nitriding Steel products in several supply conditions:
- Hardened & Tempered (Pre-hardened): Supplied in 'T' or 'V' condition ready for machining and final nitriding.
- Bright Ground: Centerless ground finish for high-precision shafts and valve guide stems.
- Black Annealed: Normalized/annealed condition for heavy deep-hole drilling and complex CNC profile cutting.
Recommended heat treatment and nitriding process for Nitriding Steel components:
- Core Hardening: Heat to 870°C – 910°C, quench in oil or polymer.
- Core Tempering: Temper at 600°C – 670°C (temper temperature MUST be higher than nitriding temp to avoid softening).
- Gas / Plasma Nitriding: Nitride at 500°C – 540°C in ammonia gas / plasma atmosphere for 20 to 60 hours for target case depth (0.2mm - 0.6mm). Zero distortion as no liquid quench is involved.
Main industrial applications of Nitriding Steel:
- Plastics & Rubber Industry: Injection molding screws, extruder barrels, tie bars, feed screws.
- Automotive & Engine Components: Engine crankshafts, camshafts, valve stems, gudgeon pins, fuel injection pumps.
- Precision Machinery & Hydraulics: Hydraulic cylinder rods, valve spindles, high-speed gears, die casting cores.
| British Standard (BS) | European / German (DIN / W-Nr) | Japanese (JIS) | American (AISI / SAE) |
|---|---|---|---|
| EN41B / 905M39 | 41CrAlMo7-10 / 1.8509 | SACM 645 | AMS 6470 / Nitralloy 135M |
| EN40B / 722M24 | 31CrMo12 / 1.8515 | - | AMS 6485 |
| - | 31CrMoV9 / 1.8519 | SACM 645 (mod) | - |
| EN19 (Nitrided) | 42CrMo4 / 1.7225 | SCM 440 | AISI 4140 |
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 NITRIDING STEEL GRADE?
Our engineers are here to help you choose the perfect grade for your specific fabrication and mechanical requirements.