Description
EN52 Round Bars / BS 401S45 / IS X45Cr9Si3 / EN X45CrSi9-3 / EN 1.4718
EN52 Round Bars is a high-strength spring steel round bar used for applications requiring a combination of strength, hardness, toughness and resistance to repeated loading. EN52 steel is commonly associated with spring and valve-related engineering applications where reliable mechanical performance is important.
Textron Steel and Alloys supplies EN52 Round Bars in different diameters, lengths and surface conditions to meet the requirements of engineering, automotive, machinery and industrial manufacturers. EN52 round bars can be supplied in black, bright, peeled, ground or machined conditions depending on size and application requirements.
BS 970 EN52 is also equivalent / known as BS 401S45, IS X45Cr9Si3, EN X45CrSi9-3, EN 1.4718 under different standards.
The material can be supplied according to applicable specifications and customer requirements, with inspection documentation and testing available where required.
BS 970 Volume 3 (1955) : EN52 Silicon Chromium Valve Steels
BS 970 Part 4 (1970) : 401S45 Silicon Chromium Valve Steels
BS EN 10090 (1998) : X45CrSi9-3 / 1.4718 Valve Steel and Alloys
IS 1570 Part 5 (1985) : X45Cr9Si3 Stainless and Heat-Resisting Steels
IS 7494 (1981) : X45Cr9Si3 Steel for valves for internal combustion engines
What Is EN52 Round Bar?
EN52 Round Bar is a spring steel round bar intended for demanding mechanical applications. Its combination of strength and elastic properties makes it suitable for components exposed to repeated loads, vibration and mechanical stress.
The round-bar form allows EN52 steel to be used directly for machining, forging and manufacturing of cylindrical components. Depending on the customer’s requirements, EN52 round bars can be supplied in hot-rolled, forged, bright or machined conditions.
The grade is particularly relevant to applications where components must retain their mechanical performance under repeated loading and elevated operating conditions.
EN52 Chemical Composition :
Chemical Composition of 401S45, X45Cr9Si3, X45CrSi9-3 / 1.4718 :
| Standards | BS 970 1955 (Vol. 3) | BS 970 1970 (Part 4) | IS 1570 1985 (Part 5) | BS EN 10090 (1998) | ||||
| Grades | EN52 | 401S45 | X45Cr9Si3 | X45CrSi9-3 | ||||
| 1.4718 | ||||||||
| Elements | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. |
| C | 0.40 | 0.50 | 0.40 | 0.50 | 0.40 | 0.50 | 0.40 | 0.50 |
| Si | 3.00 | 3.75 | 3.00 | 3.75 | 3.00 | 3.75 | 2.70 | 3.30 |
| Mn | 0.30 | 0.60 | 0.30 | 0.75 | 0.30 | 0.60 | – | 0.60 |
| S | – | 0.040 | – | 0.030 | – | 0.050 | – | 0.030 |
| P | – | 0.040 | – | 0.040 | – | 0.045 | – | 0.040 |
| Ni | – | 0.50 | – | 0.50 | – | 0.50 | – | 0.50 |
| Cr | 7.50 | 9.50 | 7.50 | 9.50 | 7.50 | 9.50 | 8.00 | 10.00 |
EN52 Round Bar Features & Advantages :
• High tensile strength
• Good hardness after suitable heat treatment
• Good fatigue resistance
• Suitable for spring applications
• Good resistance to repeated mechanical loading
• Suitable for valve and engine components
• Good wear resistance
• Available in multiple diameters
• Suitable for machining after appropriate condition
• Available in black and bright finishes
• Can be supplied in cut-to-length pieces
• Suitable for industrial and automotive applications
EN52 Round Bar Applications :
EN52 steel round bars can be used for manufacturing various components where high strength and resistance to cyclic loading are required.
Typical applications include:
• Automotive components
• Valve components
• Engine components
• Springs
• Heavy-duty springs
• Industrial machinery
• Mechanical components
• Shafts
• Pins
• Bushes
• Fasteners
• High-strength engineering components
• Power-generation equipment
• General engineering applications
