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Ganpat Metal manufactures and supplies certified Tool Steel EN31 / 100Cr6 (Bearing Steel) Round Bars conforming to BS 970 535A99 / EN31, ASTM A295 52100. EN31 (100Cr6 / AISI 52100) is a high-carbon alloy bearing steel known for high surface hardness, superior wear resistance, and long rolling-contact fatigue life. Widely used for roller bearings, rollers, shafts, collets, and precision machine pins.
Our Tool Steel EN31 round bars are produced under rigorous quality management, supplied in cold drawn, peeled, centerless ground, or forged rough-turned condition. Each bar is carefully heat treated to achieve optimum grain structure, superior straightness (≤ 1 mm/m), and uniform mechanical strength suitable for high-speed machining, valve components, pump shafts, and structural engineering fasteners.
We maintain extensive inventories from 3 mm to 500 mm diameter in standard mill lengths and custom cut-to-length billets with complete EN 10204 Type 3.1 Mill Test Certificates and third-party inspection support.
GM handles enquiries for Tool Steel EN31 Round Bars where buyers need to match round bar diameters, machining tolerances (h9, h11, k12), and material grade to engineering drawings or purchase specifications. The supplied range covers precision cold drawn, peeled, centerless ground, and forged round bars beginning from 3 mm up to 500 mm diameter, with cut-to-size billet and pre-machined options.
Grade selection should be based on the required mechanical properties, core hardness, chemical composition, and operating temperature conditions of the application. Buyers should also confirm the applicable standard specification (ASTM / ASME / DIN / EN), delivery condition (annealed, solution treated, or quenched & tempered), NDT testing (ultrasonic / PMI), and mill documentation before finalizing an order.
| Parameter | Specification |
|---|---|
| Standard Specifications | BS 970 535A99 / EN31, ASTM A295 52100 |
| Grade Designation | Tool Steel EN31 (UNS G52986 / W.Nr. 1.3505 / AISI 52100) |
| Diameter Range | 3 mm to 500 mm (1/8" to 20" diameter) |
| Length | 100 mm to 6500 mm / Custom cut-to-length |
| Manufacturing Process | Hot Rolled, Cold Drawn, Forged, Peeled, Centerless Ground |
| Condition & Temper | Solution Annealed, Normalized & Tempered / Quenched & Tempered |
| Surface Finish | Bright Drawn (h9/h11), Ground (h8), Smooth Turned, Black |
| Dimensional Tolerance | ASTM A484 / EN 10278 (h8, h9, h11, k12) |
| Testing & Certification | 100% PMI, Tensile & Yield, Hardness, Ultrasonic Testing (UT) |
| Documentation | EN 10204 3.1 / 3.2 Mill Test Certificate, NABL Accredited Lab Report |
Standard chemical composition limits conform to international metallurgical standards.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 – 1.10 |
| Chromium (Cr) | 1.30 – 1.60 |
| Manganese (Mn) | 0.25 – 0.45 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Iron (Fe) | Balance |
Minimum mechanical property requirements in designated standard delivery condition:
| Property | Value (Hardened & Tempered) |
|---|---|
| Hardness (After Heat Treatment) | 60 – 64 HRC |
| Annealed Hardness (max) | 207 HB |
| Tensile Strength (Annealed) | 750 MPa |
| Yield Strength (Annealed) | 450 MPa |
| Density | 7.81 g/cm³ |
| Standard / Country | Designation |
|---|---|
| British Standard | BS 970 535A99 / EN31 |
| AISI / SAE | 52100 |
| UNS | G52986 |
| Werkstoff Nr. | 1.3505 |
| EN / DIN | 100Cr6 |
| JIS | SUJ 2 |
| Form / Type | Size Range | Length / Dimensions | Condition / Standard |
|---|---|---|---|
| Cold Drawn Bright Bar | 3 mm to 65 mm Dia | 1000 mm to 6000 mm | Cold Drawn, h9/h11, Annealed |
| Peeled & Turned Bar | 20 mm to 160 mm Dia | Up to 6000 mm | Peeled & Polished, k12/h11 |
| Hot Rolled Black Bar | 20 mm to 200 mm Dia | Up to 6000 mm / Random | Hot Rolled, Annealed & Pickled |
| Forged Rough Turned Bar | 100 mm to 500 mm Dia | Up to 5000 mm | Forged, Solution Treated & Quenched |
| Precision Centerless Ground | 5 mm to 100 mm Dia | Up to 4000 mm | Ground Finish, h8/h9, Ra < 0.4 µm |
Custom dimensions, special cuts, and tailored surface conditions available on request.
Enter round bar diameter & length and click Calculate to get approximate weight.
Ganpat Metal manufactures and supplies certified Tool Steel EN31 Round Bars for industrial buyers across India. All materials are sourced from premium quality mills, fully tested for chemistry, mechanical properties, and dimensional tolerances, and supplied with complete traceable Mill Test Certificates.
Whether you require standard stock dimensions or customized sizes, Ganpat Metal maintains deep inventories in Mumbai and provides rapid dispatch, custom cut-to-length services, and third-party inspection support.
India
UAE
Saudi Arabia
Oman
Australia
Malaysia
Singapore
Bangladesh
Egypt
Brazil
Russia
Kazakhstan
| Requirement | Details to Provide |
|---|---|
| Grade & Material | Tool Steel EN31 / 100Cr6 (Bearing Steel) (UNS G52986 / W.Nr. 1.3505 / AISI 52100) |
| Standard | BS 970 535A99 / EN31, ASTM A295 52100 |
| Diameter (mm) | Required diameter in mm or inches with tolerance class |
| Length | Standard 3000 mm / 6000 mm or specific cut-to-length in mm |
| Delivery Condition | Cold Drawn / Peeled / Centerless Ground / Forged Rough Turned |
| Quantity | Required quantity in kg, meters, or number of bars |
| Testing Requirements | PMI, Ultrasonic Testing (UT), Hardness, Tensile, Third-Party Inspection |
| Documentation | EN 10204 3.1 / 3.2 MTC with full chemical and mechanical data |
