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Product Overview

Introduction to Engineering Steel EN9 (AISI 1055 / DIN CK55)

EN9

MOKSH TUBES & FITTINGS LLP is a leading manufacturer, supplier, exporter, and stockist of EN 9 steel products including Round Bars, Flat Bars, Squares, Forgings, Shafts, Sheets & Plates, Pipes, and Custom Profiles.

EN 9, is a medium carbon steel with good tensile strength, wear resistance, and hardenability. It is suitable for components requiring higher strength and better mechanical properties than mild steel. EN 9 offers a good balance between strength and toughness, and is ideal for shafts, gears, spindles, and automotive parts. It can be flame or induction hardened and is suitable for oil or water quenching..

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Engineering Steel EN9 Specifications

Category Details
Grade EN 9 / C45 / SAE 1045
Type Medium Carbon Steel
Typical Chemical Composition C 0.42–0.50%, Mn 0.60–0.90%, P ≤ 0.040%, S ≤ 0.050%
Conditions Annealed, Normalized, Hot Rolled, Cold Drawn
Heat Treatment Quenching & Tempering, Stress Relieving
Testing Tensile, Hardness, Chemical, UT (on request)
Certification EN 10204 3.1 / 3.2

Chemical Composition of EN9 Steel

Element Composition (%)
Carbon (C) 0.50 – 0.60
Manganese (Mn) 0.60 – 0.90
Silicon (Si) 0.10 – 0.35
Sulfur (S) ≤ 0.05
Phosphorus (P) ≤ 0.05

EN9’s higher carbon content enables excellent surface hardness after flame or induction hardening, making it ideal for wear-resistant components.

Physical Properties of EN9 Steel

Property Metric Imperial
Density 7.85 g/cm³ 0.284 lb/in³
Melting Range 1370 – 1430 °C 2500 – 2600 °F
Elastic Modulus (Tension) 200 GPa 29,000 ksi
Elastic Modulus (Torsion) 79 GPa 11,500 ksi
Poisson’s Ratio 0.29
Thermal Conductivity 44 W/m·K
Specific Heat 460 J/kg·K

Heat Treatment of EN9 Steel

Process Temperature Range Cooling / Procedure
Annealing 760 – 820 °C Slow furnace cooling
Normalizing 800 – 850 °C Air cool
Hardening 780 – 820 °C Water or oil quench
Tempering 150 – 650 °C Reheat to required hardness
Stress Relieving 540 – 650 °C Hold 1–2 hours

👉 Hardness after flame / induction hardening: 50 – 55 HRC

Mechanical Properties of EN9 Steel

Property Annealed Hot Finished Cold Drawn Hot Rolled Sheet
Tensile Strength (MPa) 517–586 586–758 620–793 517–655 482–586
Yield Strength (MPa) 241–345 345–552 379–552 241–379 207–345
Elongation (%) 25–30 15–25 15–20 20–25 20–30
Brinell Hardness (HB) 130–160 160–210 160–190 130–160
Rockwell Hardness 70–80 B 80–90 B 80–90 B 70–80 B 70–80 B

International Standards & Equivalent Grades of EN9 Steel

Standard Equivalent Grade
EN EN 9
AISI / SAE C45 / 1045
DIN CK45
JIS S45C
GB 45

Products in Engineering Steel 9

Engineering Steel 9 is typically available in:

Seamless Pipes
Welded Pipes (ERW & EFW)
Tubes (Capillary, U-Bend)
Sheets & Plates
Coils & Strips
Round Bars, Flat Bars, Hex Bars, Square Bars
Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
Fasteners (Bolts, Nuts, Screws, Washers, Studs)
Custom Fabricated Components

Engineering Steel 9 products are produced to the following global standards:

Uses and Advantages

High surface hardness after flame/induction hardening
Good wear resistance
Easy machinability in normalized condition
Suitable for heat treatment (quenching and tempering)

Applications of Engineering Steel 9

Engineering Steel 9 is extensively used in engineering, mechanical, and automotive sectors for medium-strength applications where surface hardness and fatigue resistance are essential.

Automotive and Machinery Parts

Used for axles, spindles, crankshafts, connecting rods, gears, and rollers requiring moderate strength and wear resistance.

General Engineering Components

Ideal for shafts, studs, bolts, pins, and levers where mechanical reliability is critical.

Construction and Fabrication

Utilized in support rods, brackets, wear plates, and fixtures subjected to static and dynamic loads.

Tool Manufacturing

Suitable for jigs, dies, and molds that need moderate toughness and hardness.

Agricultural and Industrial Equipment

Used in machine components, tillage tools, and equipment parts that undergo heavy mechanical loading.

WHY CHOOSE US?

Precision Manufacturing: State-of-the-art processing with strict dimensional and mechanical accuracy
Stock Availability: Extensive inventory of EN 9 products in multiple sizes and shapes
Custom Solutions: Cut-to-length, machining, and heat-treated options available
Material Certifications: Supplied with full test reports (MTCs), complying with global standards
Industry Expertise: Trusted by clients across automotive, machinery, tooling, and engineering sectors

EN9 Steel Price in India

Typical Range: ₹80 – ₹150 per kg

(Price varies by OD, wall thickness, form, and finish)

Contact us for exact quotation based on size and quantity.

FAQ's

What is EN 9 steel and why is it widely used?

EN 9 is a medium carbon steel grade containing 0.50–0.60% carbon, known for its high tensile strength, good wear resistance, and excellent hardenability. It offers a balanced combination of strength and toughness, making it suitable for engineering and automotive components that demand higher mechanical performance than mild steel. EN 9 can be flame or induction hardened and is commonly used in shafts, gears, spindles, rollers, and other parts subjected to dynamic stresses.

What are the key chemical and mechanical properties of EN 9 steel?

EN 9 steel has a chemical composition of 0.50–0.60% carbon, 0.60–0.90% manganese, 0.10–0.35% silicon, and controlled levels of phosphorus and sulfur with the balance being iron. It provides tensile strength between 75–115 ksi (517–793 MPa) and yield strength ranging from 35–80 ksi (241–552 MPa), depending on its condition. Its hardness varies between 130–210 Brinell and 70–90 Rockwell B, while elongation is 15–30%. These properties make EN 9 a versatile engineering steel with good machinability, wear resistance, and heat treatment response.

What EN 9 steel products are supplied by MOKSH TUBES & FITTINGS LLP?

MOKSH TUBES & FITTINGS LLP offers a comprehensive range of EN 9 steel products including round bars, flat bars, square bars, hex bars, forged bars, shafts, sheets, plates, coils, strips, pipes, tubes, pipe fittings, flanges, fasteners, and custom fabricated components. Products are manufactured according to international standards and can be supplied in normalized, annealed, hot rolled, or cold drawn conditions with customized machining and cut to length services to meet specific industry requirements.

What are the major applications of EN 9 steel?

EN 9 steel is widely used in automotive and mechanical engineering for manufacturing crankshafts, axles, spindles, gears, rollers, studs, and connecting rods. It is also utilized in general engineering for shafts, bolts, pins, levers, and wear plates. In tool manufacturing, it is used for making jigs, dies, and molds, while in agricultural and industrial equipment it finds applications in machine parts, tillage tools, and high-strength components that require wear resistance and fatigue performance.

Why choose MOKSH TUBES & FITTINGS LLP for EN 9 steel products?

MOKSH TUBES & FITTINGS LLP is a trusted global supplier, manufacturer, and exporter of EN 9 steel, offering precision manufacturing with strict dimensional accuracy and high-quality material certifications. With a wide stock availability, custom machining options, and heat-treated solutions, the company ensures timely deliveries for diverse industries including automotive, machinery, construction, tooling, and general engineering. Backed by technical expertise and competitive pricing, MOKSH TUBES & FITTINGS LLP is the preferred choice for EN 9 steel solutions worldwide.

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