Description
1.7147 Round Bars / 20MnCr5 Round Bars – Case Hardening Steels
1.7149 Round Bars / 20MnCrS5 Round Bars – Case Hardening Steels
1.7147 Round Bars (standard designation 20MnCr5) is a Chromium-Manganese Case-Hardening alloy engineering steel engineered under EN 10084. Known for its balance of high core tensile strength (1000-1300 N/mm² post-carburizing), uniform hardenability, and high surface wear resistance after case hardening, 1.7147 is an industry-standard material for gears, transmission shafts, and heavy-duty mechanical components.
1.7147 / 20MnCr5 Round Bar is a Manganese-Chromium alloy steel widely used for components requiring a hard, wear-resistant surface combined with a strong and comparatively tough core after carburizing and case hardening. It is identified by Material Number 1.7147 and is traditionally specified under EN 10084 for case-hardening steels.
Textron Steel and Alloys supplies 1.7147 / 20MnCr5 Round Bars in different diameters, surface conditions, lengths and delivery conditions as required by customers. The material is widely used for gears, pinions, shafts, bushes, transmission components, automotive parts and other engineering components where surface wear resistance and core strength are important.
20MnCr5 / 1.7147 belongs to the Mn-Cr family of case-hardening steels. Its relatively low carbon content allows the material to be machined and carburized, while manganese and chromium contribute to hardenability and core strength. After suitable carburizing, hardening and tempering, the component can achieve a hard wear-resistant case while retaining a tougher core.
1.7147 Chemical Composition of 20MnCr5 as per EN 10084 :
1.7149 Chemical Composition of 20MnCrS5 as per EN 10084 :
| EN 10084 | 1.7147 / 20MnCr5 | 1.7149 / 20MnCrS5 | ||
| Elements | Min. | Max. | Min. | Max. |
| C | 0.17 | 0.22 | 0.17 | 0.22 |
| Si | – | 0.40 | – | 0.40 |
| Mn | 1.10 | 1.40 | 1.10 | 1.40 |
| P | – | 0.025 | – | 0.025 |
| S | – | 0.035 | 0.020 | 0.040 |
| Cr | 1.00 | 1.30 | 1.00 | 1.30 |
Why Choose DIN 1.7147 / 20MnCr5 Round Bars?
Exceptional Surface Hardness: Achieves a case hardness of 58–62 HRC through conventional carburizing, quenching, and tempering, delivering strong resistance against adhesive and abrasive wear.
High Core Toughness: Resists structural fatigue, cracking, and sudden shock loads while under dynamic drive stress.
Applications of 1.7147 Round / Flat Bars :
• Gear teeth
• Pinions
• Transmission shafts
• Splined shafts
• Differential components
• Drive components
• Bushes
• Pins
• Automotive components
• Machine-tool components
1.7147 / 20MnCr5 Round Bar Available Sizes :
Textron Steel and Alloys can offer 20MnCr5 Round Bars in a broad range of diameters depending on stock availability and sourcing requirements.
Typical enquiry sizes may include:
10 mm Dia
12 mm Dia
16 mm Dia
20 mm Dia
25 mm Dia
30 mm Dia
32 mm Dia
35 mm Dia
40 mm Dia
45 mm Dia
50 mm Dia
55 mm Dia
60 mm Dia
65 mm Dia
70 mm Dia
75 mm Dia
80 mm Dia
90 mm Dia
100 mm Dia
110 mm Dia
120 mm Dia
125 mm Dia
130 mm Dia
140 mm Dia
150 mm Dia
160 mm Dia
180 mm Dia
200 mm Dia
220 mm Dia
250 mm Dia
300 mm Dia
Larger diameters and forged sections can also be sourced against enquiry.
Note: The above is an indicative size range. Actual stock, manufacturing route, tolerance and minimum order quantity should be confirmed at the time of enquiry.
Common surface conditions :
• Black / Hot Rolled : Suitable for applications where machining allowance is acceptable.
• Forged : Suitable for larger sections and components requiring a forged manufacturing route.
• Peeled / Turned : Provides improved surface finish and dimensional control.
• Cold Drawn / Bright : Suitable where closer dimensional tolerances and improved surface finish are required.
• Ground : Used where a very accurate diameter and surface finish are required.
Final tolerance should be confirmed against the applicable product standard and customer drawing.
Key Industrial Applications of 1.7147 / 1.7149 :
Due to its high core-to-surface load capacity, 1.7147 steel round bars are used throughout:
• Automotive & Powertrain : Pinions, crown wheels, differential gears, synchromesh hubs, camshafts, and piston pins.
• Heavy Machinery : Transmission shafts, cardan joints, bushings, drive sprockets, and guide rollers.
• Energy & Tooling : Drill collar parts, planetary gear rings, high-wear spindles, and plastic mold base plates.
