41CrAlMo7 1.8509 Round Steel Bar
Nitrogen hardening chromium aluminium molybdenum bar from 5mm to 500mm diameter
Specifications
Steel Bar
1045 C45 S45C CK45 Medium Carbon Round Steel Bar
Medium carbon engineering bar in 0-500mm diameter hot rolled black or cold drawn bright
1045 C45 S45C 1.1191 CK45 round steel bar is a medium carbon general engineering structural steel with good machinability and high tensile properties. It is specified by machine shops die makers and tool manufacturers who need bar that can be machined soft and then flame or induction hardened on the working face. Delivery hardness is 18-25HRc so the bar turns drills and mills before treatment instead of blunting tooling. Buying it in 0-500mm diameter and 6m lengths from one grade family removes the search for a separate stock item every time a drawing arrives written to a different standard.
- Product Name — 1045 C45 S45C 1.1191 CK45 Round Steel Bar
- Grade — 1045 C45 S45C 1.1191 CK45
- Standards — BS EN GB AISI ASTM DIN JIS
- Diameter — 0-500mm
- Length — 6m or customized
Why It Is Specified
Key Benefits of 1045 C45 S45C 1.1191 CK45 Round Steel Bar
Machines Soft Then Hardens on the Working Face
Delivery hardness of 18-25HRc keeps the bar easy to cut. Flame or induction hardening followed by tempering at 150-200 degrees Celsius can lift the case to a surface hardness of Rc 58 without softening it again.
One Steel Under Five Standard Designations
1045 C45 S45C 1.1191 and CK45 name the same medium carbon steel. A drawing written to AISI ASTM EN DIN GB BS or JIS can be filled from the same bar rather than from five separate stock lines.
Diameter Range From Pins to Heavy Shafts
Bar is supplied from 0 to 500mm diameter, and large sections are better taken from forged bar. Small dowels and heavy shaft blanks can therefore sit on the same order.
Black or Bright Surface to Suit the Operation
Hot rolled black bar suits parts machined all over. Cold drawn bright bar holds a closer surface for components used close to the as-delivered diameter.
Cut to Billet Length Instead of Full Bars
Standard length is 6m and bar is cut to your billet list before shipment. The remnant stays at our yard instead of filling your rack.
Same Grade in Plate Flat Square Hexagon and Pipe
CK45 is normally supplied as plate round bar flat bar square bar hexagonal bar and pipe. A mixed tool order can be kept on one material specification.
Problems It Solves
What This Material Removes From Your Process
Drawings Written to Five Different Standards
A workshop serving several export customers receives drawings calling 1045 C45 S45C 1.1191 or CK45. Holding one bar covers all of them and stops duplicate stock sitting in the rack.
Tooling Wear During Rough Machining
Bar delivered too hard destroys inserts on the first roughing pass. Delivery hardness of 18-25HRc keeps the material cuttable and leaves the hardening step until after the shape exists.
Paying for Bar You Cut Away
Buying 6m bars to make short billets leaves remnants that are hard to use. Cutting to your billet list moves that loss off your inventory.
Hardening Without Distorting the Whole Part
Flame and induction hardening heat only to the desired case depth before quenching in water or oil, so the core keeps its toughness and the part keeps its shape.
Diameters Above Normal Rolled Range
Parts needing sections toward 500mm are hard to source as rolled bar. Large sizes are better taken as forged bar so the order does not have to be split between suppliers.
Application Scenarios
Where It Is Used
Wear and Impact Resistant Cutting Tools
Strong cutting tools that must stay wear resistant and take impact in service, machined from bar and hardened on the cutting edge.
Punching Dies and Screw Dies
Advanced punching die blocks and screw dies where the bar is machined to shape before the hardening and tempering cycle.
Punches of Complicated Shape
Punches that need toughness through the body and a hard case, including forms too intricate to grind from a fully hardened blank.
Roll Cutting Tool Industry
Scrapers serrated knives iron knives and drill bits produced on cutting tool lines that buy bar by diameter and length.
General Engineering Structural Parts
Shafts pins spacers and machine frames where high tensile properties matter more than alloy content.
Who It Is For
Buyers Who Specify This Product
- Tool and die shops buying bar for punching dies screw dies and shaped punches
- CNC machine shops buying 6m bar stock cut to billet length for turned components
- Cutting tool manufacturers buying blanks for scrapers serrated knives and drill bits
- Maintenance workshops buying shaft and pin stock in a grade they can flame harden in house
- Forging shops buying large diameter bar for parts above the rolled size range
- Steel stockists carrying a medium carbon line that answers AISI EN DIN and JIS drawings
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | 1045 C45 S45C 1.1191 CK45 Round Steel Bar |
|---|---|
| Grade | 1045 C45 S45C 1.1191 CK45 |
| Standards | BS EN GB AISI ASTM DIN JIS |
| Diameter | 0-500mm |
| Length | 6m or customized |
| Size | Customized |
| Technique | Hot rolled cold rolled |
| Surface | Nature or painted |
| Delivery Hardness | 18-25HRc |
| Hardness | 201-269HB water quenched at 820-870 degrees Celsius for 5 minutes |
| Tempering Temperature | 552 degrees Celsius |
| Place of Origin | China |
| Processing Service | Bending welding decoiling cutting punching |
| Certificate | Mill test certificate |
Technical Features
- Grades 1045 C45 S45C 1.1191 and CK45 medium carbon engineering steel
- Standards BS EN GB AISI ASTM DIN and JIS
- Diameter 0-500mm or customized as required
- Length 6m or customized as required
- Technique hot rolled black surface or cold drawn bright surface
- Delivery hardness 18-25HRc
- Hardness 201-269HB water quenched from 820-870 degrees Celsius
- Processing service bending welding decoiling cutting and punching
Materials
- Medium carbon general engineering structural steel supplied as 1045 C45 S45C 1.1191 or CK45
- Hot rolled bar with a black surface for parts machined all over
- Cold drawn bar with a bright surface for parts used close to delivered size
- Forged bar for the large sections toward the top of the diameter range
Certification
- Mill test certificate supplied with each shipment
Manufacturing
How It Is Made and Processed
Melting and rolling to medium carbon bar
Hot rolling to diameter or cold drawing to a bright finish
Forging for the large diameters
Cutting to 6m or to your billet length
Optional bending welding decoiling and punching
Surface left natural or painted
Bundling marking and loading for export
Quality Control
Checks Before It Ships
- Mill test certificate issued for the ordered grade designation
- Delivery hardness checked against the 18-25HRc range
- Diameter verified across the ordered section before cutting
- Cut lengths measured against the billet list before bundling
- Surface condition inspected for black or bright finish as ordered
Customization
What We Can Change on Your Order
- Diameter selected anywhere in the 0-500mm range
- Length cut to your billet list instead of the standard 6m bar
- Hot rolled black or cold drawn bright surface on request
- Grade marked to the designation used on your drawing
- Bending welding cutting and punching carried out before shipment
- Painted surface for bar that will be stored outdoors
Comparison
1045 C45 S45C 1.1191 CK45 Round Steel Bar Against the Alternatives
| Low carbon mild steel bar | Medium carbon content gives higher tensile properties and allows flame or induction hardening to a surface hardness of Rc 58, which mild steel cannot reach. |
|---|---|
| Alloy tool steel bar | 1045 costs less and machines more freely, and for punches and dies in moderate duty the hardened case plus a tough core is often all the part needs. |
| Pre-hardened bar stock | Delivery hardness of 18-25HRc keeps machining cheap, so the heat treatment happens after the shape is cut rather than fighting the tool on every pass. |
| Cast or fabricated blanks | Rolled and forged bar gives a continuous section with no weld line or casting porosity under the hardened face. |
Use Guide
Specifying Handling and Welding Notes
- Rough machine while the bar is at delivery hardness and leave grinding stock for the hardened case
- Harden from an austenitizing temperature of 800-845 degrees Celsius with oil or water quenching
- For flame and induction hardening heat quickly to the case depth you need then quench in water or oil
- Temper the case at 150-200 degrees Celsius to relieve stress without losing hardness
- Order forged bar rather than rolled for the largest diameters in the range
- State the standard your drawing uses so the bar is marked and certified under that designation
Questions Buyers Ask
1045 C45 S45C 1.1191 CK45 Round Steel Bar FAQ
What diameters and lengths do you hold?
Diameter runs from 0 to 500mm and standard length is 6m. Both are customized as required, so bar can arrive cut to your billet list.
Are 1045 C45 S45C 1.1191 and CK45 the same steel?
They are the same medium carbon engineering steel under AISI EN DIN and JIS designations. Tell us which designation your drawing uses and the mill test certificate will be issued against it.
How hard is the bar when it arrives?
Delivery hardness is 18-25HRc. That keeps it machinable, and hardness after quenching from 820-870 degrees Celsius is quoted at 201-269HB.
Can we case harden it after machining?
Yes. Flame and induction hardening are carried out by heating quickly to the required case depth and quenching in water or oil, and a surface hardness of Rc 58 can be obtained with a temper at 150-200 degrees Celsius.
Do you supply black bar or bright bar?
Both. Hot rolled bar comes with a black surface and cold drawn bar with a bright surface. Large sections are better supplied as forged bar.
Can we get the same grade as plate or flat bar?
Yes. CK45 is normally supplied as plate round bar flat bar square bar hexagonal bar and pipe, so a mixed order can stay on one grade.
Is a sample available before we commit to a production order?
Samples are available. Send the diameter length and surface condition you want to test and we will confirm what can be released.
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