EN8 Round Bar
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Solitaire Steel is a reliable supplier and exporter of EN8 round bars, a medium-carbon steel alloy known for its moderate tensile strength and enhanced performance over low-carbon steel. EN8 round bars can be hardened to improve tensile strength, making them stronger than mild steel. A key advantage of this alloy is its machinability, which remains efficient in both untreated and hardened conditions.
Typically, EN8 square bars are supplied untreated, allowing users to apply their hardening processes based on specific needs. Similar to EN9, EN8 steel can undergo induction hardening to increase surface hardness and wear resistance, making it ideal for applications where abrasion is common.
By heat treating EN8 flat bars, the alloy achieves a uniform metallurgical structure, enhancing machinability and providing consistent results across various applications. With tensile strengths ranging from 500 N/mm² to 800 N/mm², EN8 bright bars offer moderate strength and improved durability. As an unalloyed carbon steel, EN8 steel bars deliver a balanced combination of strength, machinability, and resistance suitable for many engineering applications.
Specification of EN8 Bar Round
| Grade | EN-8 Carbon Steel Round Bar |
|---|---|
| Square bar size | 4 to 100mm |
| Hollow Bar | 32mm OD x 16mm ID to 250mm OD x 200mm ID) |
| Hex Bar size | 2-100mm A/F |
| Angle bar size | 3mm*20mm*20mm~12mm*100mm*100mm |
| Rectangles Size | 33 x 30mm to 295 x 1066mm |
| Flat bar size | Thickness: 2 -100mm |
| Width: 10 to 500mm | |
| Channel Bar | 80 x 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness |
| Section | 3.0 to 12.0mm thickness |
| size | Diameter: 3-~800mm |
| Billet Size | 1/2″ to 495mm Diameter |
| Standard Dimensions | Diameter / Height: EN-8 Round Bar Rod and Bar Sizes : 0.5 inches / 0.625 inches / 0.75 inches / 0.875 inches / 1.0 inches / 1.125 inches / 1.25 inches / 1.375 inches / 1.5 inches / 1.75 inches / 2.0 inches / 2.25 inches / 2.5 inches / 2.75 inches / 3.0 inches / 3.25 inches / 3.5 inches / 3.75 inches / 4.0 inches / 4.25 inches / 4.5 inches / 5.0 inches / 5.25 inches / 5.5 inches / 6.0 inches / 7.0 inches / 8.0 inches / 9.0 inches. |
| Surface | Bright, Hot Rolled Pickled, Cold Drawn, Sand Blasting Finished, Polished, Hairline |
| Tolerance | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
| Technique | EN-8 Round Bar Hot Rolled, Cold Drawn, Cold Rolled, Forged Round Bar, Rod |
| Condition | Hardened & tempered, annealed |
| Finish | Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black |
| Form | EN-8 Round Bar Round, Rod, T-Bar, EN-8 steel Channel Bar, Precision Ground Bar, EN-8 Carbon Steel Flat Bar, Carbon Steel EN-8 Square Bar, CS EN-8 Blocks, EN-8 Round Rod, EN-8 CS Rings, EN 8 Steel Hollow, EN 8 Steel Grade Triangle, Rectangle, Hex (A/F), CS EN-8 Threaded, Half Round Bar, Profiles, Steel Grade EN 8 Billet, EN-8 steel Ingot, I/H Bar, Forging etc. |
| Processing | Bar cutting to 650mm |
EN8 Chemical Composition
| Silicon | 0.10-0.40% |
| Carbon | 0.36-0.44% |
| Manganese | 0.60-1.00% |
| Sulphur | 0.050 Max |
| Phosphorus | 0.050 Max |
| Chromium | – |
| Molybdenum | – |
| Nickel | – |
EN8D Material Mechanical Properties
| 080M40 (EN8) – mechanical properties in “R” condition | ||
|---|---|---|
| Max Stress | 700-850 n/mm2 | |
| 0.2% Proof Stress | 450 n/mm2 Min | (up to 19mm LRS) |
| Yield Stress | 465 n/mm2 Min | (up to 19mm LRS) |
| Elongation | 16% Min | (12% if cold drawn) |
| Impact KCV | 28 Joules Min | (up to 19mm LRS |
| Hardness | 201-255 Brinell | |
EN8D Equivalent Grade
| BRITISH BS 970:1991 | 080M40, 080A42 |
| BRITISH BS 970:1955 | EN8, EN8D |
| AISI / ASTM A29 | 1038, 1040, 1045 |
| DIN Werkstoff No. | 1.0511, 1.1186, 1.1189 |
| BS & DIN European | C40, CK40, C45, CK45 |
| JIS G4051 | S40C, S45C |
| AISI / SAE | 1040, 1042 |
| EN | EN8 |
| BS | 080A40 |
Carbon Steel EN8 Bar Sizes
| Size (inches) |
1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 1 | 5/8 | 11/16 | 3/4 | 1 | 7/8 | 1 | 1 | 1 1/8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4 | 1 3/8 | 1 7/16 | 1 1/2 | 1 5/8 | 1 3/4 | 1 7/8 | 2 | 2 1/8 | 2 1/4 | 2 3/8 | 2 1/2 | 2 5/8 | 2 3/4 | |
| 3 | 3 1/4 | 3 1/2 | 3 3/4 | 4 | 4 1/4 | 4 1/2 | 4 3/4 | 5 | 5 1/4 | 5 1/2 | 6 | 6 1/2 | 7 | |
| 7 1/2 | 8 | 9 | ||||||||||||
| Size (mm) |
5 | 6 | 7 | 8 | 9 | 10 | 12 | 13 | 14 | 15 | 16 | 18 | 20 | 22 |
| 24 | 25 | 28 | 30 | 32 | 35 | 36 | 38 | 40 | 42 | 45 | 50 | 55 | 60 | |
| 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 110 | 120 | 125 | 130 | 140 | 150 |
Heat Treatment of EN8 Bright Bar
| Heat Treatment | Tensile Strength Rm | Yield Strength Rm | Rp 0.2 | A min on | Impact | Hardness | |
| 5.65√So | Izod Ft.lb | KCV J | |||||
| MPa | MPa | MPa | HB | ||||
| N | 550 | 280 | – | 16 | 15 | 16 | 152/207 |
| 510 | 245 | – | 17 | – | – | 146/197 | |
| Q | 625/775 | 385 | 355 | 16 | 25 | 28 | 179/229 |
| R | 700/850 | 465 | 450 | 16 | 25 | 28 | 201/255 |
CS EN8 Round Bar Standard Sizes
| Type | SIZES (mm) | SIZES (Inches) | ISO Tolerance |
|---|---|---|---|
| Cold Drawn and Ground | 10.00 – 75.00 | 5/6″ – 2.50″ | h8-h9-h10-h11 |
| Peeled and Polished | 40.00 – 150.00 | 1.50″ – 6.00″ | h11, h11-DIN 1013 |
| Peeled and Ground | 20.00 – 50.00 | 3/4″ – 2.00″ | h9-h10-h11 |
| Cold Drawn and Polish | 3.00 – 75.00 | 1/8″ – 3.00″ | h8-h9-h10-h11 |
Application of EN8 Round Rod
- Automotive parts
- Shafts
- Gears
- Spindles
- Stressed Pins
- Keys
- Connecting rods
- Studs, bolts
- Axles, spindles
- General engineering components
Supply and Exporter
FAQs
EN8 Carbon Steel Round Bars are widely used in metallurgical, mechanical, and electrical construction fields, as well as in ships, military applications, and automobile rear-end products. They are available at economical rates and are valued for their versatility and strength.
EN8 steel grade, also known as 080M40, is a medium carbon steel with good tensile strength and moderate hardness. It is unalloyed and commonly used for applications requiring medium strength, such as shafts, stressed pins, studs, and keys.
High Tensile Strength: Offers tensile strength of 500 to 800 MPa, ideal for components under heavy loads.Good Machinability: Relatively easy to machine, making it suitable for precision engineering tasks despite its strength.
EN8 steel, also known as 080M40, is an unalloyed medium carbon steel with good tensile strength, suitable for applications like shafts, stressed pins, studs, and keys.
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