ALLOY STEEL
Premium Quality Alloy Steel Rounds, Squares, Flats, Blocks & Industrial Engineering Grades
High Performance
Enhanced Hardness & Strength
Wear & Toughness
Heat Treatable
Corrosion Resistance
Ready Stock
ALLOY STEEL SUPPLIER IN MUMBAI
Alloy steel is a type of steel with alloying elements other than carbon added to improve its properties. Some of the common additions to alloy steel include: chromium, cobalt, columbium, molybdenum, manganese, nickel, titanium, tungsten, silicon, and vanadium. Alloy steels are known for their enhanced properties compared to plain-carbon steel, such as: corrosion resistance, hardness, strength, wear resistance, and toughness. Alloy steels are used to make fabrication tooling and end products across just about all industries. The exact grade and composition of the alloy steel can be tailored to the requirements of the application.
The application of alloy steel is very wide and depends on the type of alloy steel. Some alloy steels are used to manufacture pipes, particularly those for energy-related uses. While others are utilized in the production of corrosion-resistant containers, silverware, pots, pans, and heating components for toasters and other kitchen equipment. Alloy steels can be divided into two primary categories: low-alloy steels and high-alloy steels. The application of alloy steels is mainly determined by the category that they fall in.
High-alloy steels, on the other hand, can be expensive to produce and challenging to work with. However, they are perfect for automotive applications, chemical processing, and power generation equipment due to their high strength, toughness, and corrosion resistance.
Alloy steel can have a wide range of properties, depending on the specific alloying elements and the amounts of them added to the steel. Some of the key properties associated with some alloy steels are: high performance, durability, high strength, good performance under harsh conditions, and corrosion resistance.
ROUNDS
SQUARES
FLATS
BLOCKS
ALLOY GRADES CLASSIFICATION
CATEGORIES OF ALLOY STEEL
Alloy steels are categorized into low-alloy and high-alloy steels based on their total alloying element content and application requirements.
LOW-ALLOY STEEL
- Lower Alloying Content (< 8%)
- High Tensile Strength & Toughness
- Cost-Effective Engineering Solutions
- Pipes, Automotive Components & Machinery Parts
HIGH-ALLOY STEEL
- High Alloying Content (> 8%)
- Exceptional Corrosion & Heat Resistance
- High Performance Under Extreme Conditions
- Automotive, Chemical Processing & Power Generation
INDUSTRIAL ADAPTABILITY
APPLICATIONS OF ALLOY STEEL
Alloy steels are widely utilized across demanding industries due to their high performance and durability under harsh conditions.
AUTOMOTIVE
CHEMICAL PROCESSING
POWER GENERATION
OIL & GAS PIPES
KITCHEN & CONTAINERS
FABRICATION TOOLING
AEROSPACE
HEAVY MACHINERY
GRADE FINDER
ALLOY STEEL GRADES AVAILABLE
Use the options below to filter by standards, search specific alloy steel grades, and request quick rates.
DATA SHEET
TECHNICAL INFORMATION
Detailed metallurgical specifications, chemical compositions, mechanical properties, and available sizes of our alloy steel products.
Typical chemical compositions of prominent Alloy Steel grades supplied by Steel Mart:
| Grade | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Manganese (Mn) |
|---|---|---|---|---|---|
| EN 19 / AISI 4140 | 0.38 – 0.45 % | 0.90 – 1.20 % | 0.15 – 0.30 % | - | 0.60 – 0.90 % |
| EN 24 / AISI 4340 | 0.36 – 0.44 % | 1.00 – 1.40 % | 0.20 – 0.35 % | 1.30 – 1.70 % | 0.45 – 0.70 % |
| SAE 8620 | 0.18 – 0.23 % | 0.40 – 0.60 % | 0.15 – 0.25 % | 0.40 – 0.70 % | 0.70 – 0.90 % |
| 20MnCr5 | 0.17 – 0.22 % | 1.00 – 1.30 % | - | - | 1.10 – 1.40 % |
| Steel Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| EN 19 / AISI 4140 | 850 – 1000 | 680 Min | 13 – 15 | 250 – 300 |
| EN 24 / AISI 4340 | 850 – 1000 | 680 Min | 13 Min | 280 – 320 |
| SAE 8620 | 650 – 880 | 440 Min | 15 Min | 180 – 230 |
| 20MnCr5 | 880 – 1180 | 630 Min | 11 Min | 217 Max (Annealed) |
Rounds: 16 mm to 600 mm diameter in ready stock.
Squares: 16 mm to 250 mm A/F (Across Flats).
Flats: Thickness 10 mm to 120 mm; Widths up to 400 mm.
Blocks: Thickness 50 mm to 500 mm in custom cut sizes.
We supply Alloy Steel products in multiple finish conditions depending on application demands:
- Black Rolled / Forged: Hot rolled or forged condition with mill scale, ideal for rough machining and heavy forgings.
- Bright Drawn / Peeled: Turned, cold drawn, or peeled bright finish with precise dimensional tolerances for precision CNC turning.
- Centerless Ground: Ground and polished surface finish (+/- 0.02mm) for high-speed shafts, axles, and aerospace pins.
Recommended heat treatment procedures for optimum strength, hardness, and toughness in Alloy Steels:
- Annealing: Heat to 830°C – 860°C, furnace cool. Restores ductility and relieves internal stress.
- Normalizing: Heat to 870°C – 900°C, cool in still air. Refines grain size for uniform mechanical properties.
- Hardening: Heat to 830°C – 860°C, quench in oil or polymer medium based on section thickness.
- Tempering: Heat to 540°C – 680°C to achieve targeted hardness, tensile strength, and impact toughness.
Key industrial applications for alloy steel grades:
- Low-Alloy Steels (EN19, EN24, SAE 8620): Automotive axles, transmission shafts, heavy gears, connecting rods, high-tensile studs.
- High-Alloy Steels: Chemical processing vessels, power generation turbine components, corrosion-resistant pipes, specialized tooling.
| British / European (BS/EN) | American (AISI / SAE) | German (DIN / W-Nr) | Japanese (JIS) |
|---|---|---|---|
| EN 19 / 709M40 | AISI 4140 | 42CrMo4 / 1.7225 | SCM440 |
| EN 24 / 817M40 | AISI 4340 | 34CrNiMo6 / 1.6582 | SNCM439 |
| EN 353 / 815M17 | SAE 8620 | 21NiCrMo2 / 1.6523 | SNCM220 |
| 20MnCr5 | AISI 5120 | 20MnCr5 / 1.7147 | SMnC420 |
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 ALLOY STEEL GRADE?
Our engineering team is here to assist you in selecting the ideal alloy steel grade for your specific mechanical, heat-treatment, and performance needs.