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Hollow Bar
Hollow Bar (ST52)
Hollow Bar
Spec Sheet
About
Equivalents
Characteristics
Typical Applications
Spec Sheet
About
Hollow bar is a low carbon steel round bar with a hole in the diameter’s centre.
Hollow bars are available in 32 – 510 mm outside diameters and with varying wall thickness.
This steel is typically used to manufacture hydraulic cylinder barrels or honed cylinders, bushes, industrial rings, and case hardened roller rolls for coal cutting and spacers.
Hollow bar is non-alloy steel that contains 0.22% carbon. It is versatile steel that is formed with a hole in the centre to shorten lead times that would typically be spent drilling the hole through.
It is easily machined and welded and can be case hardened using carburising, carbonitriding, notriding, nitrocarburizing and tuftriding.
Special Steels sells ST52 hollow bar. We cut the quantity of hollow bar to the tolerance required for precision engineering and manufacturing.
We also offer machine preparation and deliveries.
Equivalents
Commonly known as hollow bar or mechanical tubing
British: ST52
Chinese: Q345B
German: DIN 2391 Part 2
Characteristics
- Carbon Steel
- Machinability good
- Weldability good
- Required hardness can be achieved by case hardening the outer surface by means of the following methods i.e. carburising, carbonitriding, nitriding, nitrocarburising, tuftriding
Typical Applications
- Hydraulic cylinders / Honed cylinders
- Bushes (not subject to severe weather)
- Rings (industrial)
- Case hardened rollers (light duty)
- Rolls for coal cutting equipment
- Spacers
Hollow Bar (EN8)
Spec Sheet
About
Equivalents
Characteristics
Typical Applications
Spec Sheet
About
EN8 is a medium carbon steel that Special Steels supplies as a hollow bar (EN8).
This is typically used when mild steel does not provide sufficient surface hardening potential. One can manufacture axles, driveshafts, crankshafts, connecting rods, high tensile bolts, studs, propeller shaft joints, rifle barrels, and induction hardened pins from EN8 because it is more cost-effective than alloy steels.
EN8 is a medium carbon steel that can be machined, welded, and suitable for surface hardening treatments like induction and flame hardening. EN8 contains between 0.36% and 0.44% carbon.
It can be machined and welded because the carbon content is low enough but has a high enough carbon content to allow surface hardening. It is more affordable than alloy steel while providing the same benefits.
We cut the quantity of EN8 to the tolerance required for precision engineering and manufacturing.
We also offer machine preparation and deliveries.
Equivalents
American: AISI 1038
British: BS970 Part 1 1983, 080M40 (EN8)
Chinese: S45/S45C
German: W. Stoff No 1.1186
Characteristics
- Carbon steel – 40 ton tensile black axle steel
- A 6% allowance should always be made for removal of surface defects during machining
- Machinability good (not recommended for case hardening)
- Weldability good (carbon content low enough)
- Heat treatment only to limited ruling sections/can be surface hardened (induction hardening)
Typical Applications
- Axles
- Drive shafts
- Crankshafts
- Connecting rods
- High tensile bolts
- Studs
- Propeller shaft joints
- Rifle barrels
- Breech mechanisms for small arms
- Induction hardened pins
Hollow Bar (EN19)
Spec Sheet
About
Equivalents
Characteristics
Typical Applications
Spec Sheet
About
EN19 is a high tensile strength alloy steel.
This steel provides mechanical properties for applications like manufacturing axles, drive shafts, propeller shafts, crankshafts, rifle barrels, connecting rods, breach mechanisms studs, high tensile bolts and induction hardened pins.
EN19 is ideal for high load bearing applications which require ductility and shock resistance. EN19 has excellent tensile strength properties.
It is easy to machine and is weldable in the “as rolled” condition. It can be nitrated, flame hardened, induction hardened, quenched and tempered.
Special Steels sells EN19 hollow bar. We cut the quantity of EN19 hollow bar to the tolerance required for precision engineering and manufacturing.
We also offer machine preparation and deliveries.
Equivalents
American: AISI 4140
British: BS970 Part 1 1983, 709M40 (EN19)
Chinese: 42CrMo4
German: W. Stoff No 1.7225
Characteristics
- Alloy steel
- A 6% allowance should always be made for removal of surface defects during machining
- Machinability good
- Weldable in the as rolled condition
- Ideal for 60 ton tensile applications up to 100mm max
- Sizes above limited ruling section will be heat treated to hardness only with no guarantee on mechanial properties
- This grade can be nitrited, flame and or induction hardened
Typical Applications
- Axles
- Drive shafts
- Propeller shaft joints
- Crankshafts
- Rifle barrels
- Connecting rods
- Breech mechanisms for small arms
- Studs
- High tensile bolts
- Induction hardened pins