Circular Roll Shear Knives

 

 

 

 

 

SHJ KNIFE focuses on industrial replacement blades for coil processing, tube mills and steel service centers. Our circular metal roll shear knives are designed for rolling shear stands and slitting machines that cut strip and coil on a daily basis.

 

In many plants, the roll shear works as the "workhorse" in front of, or together with, the slitting line. When the knife profile, steel grade or tolerance is not right, you see burr, edge wave or strip marks very quickly. The circular roll shear knife for metal we supply targets these real production issues instead of just meeting a drawing.

 

We combine proper tool steel selection, controlled heat treatment and accurate grinding. As a result, our circular rotary shear knives for steel coil help operators keep a clean edge, reduce adjustment time and extend the time between regrinds.

 

 

Customers do not only ask us for one single ring. They look for a supplier of industrial machine knives who understands how the roll shear, slitting and straight shear work together on the line. That is why we position this product inside our wider range of industrial replacement blades for metal processing.

 

When you send us used knives from your current supplier, we measure the OD, ID, thickness, face angle and edge geometry. We then match or upgrade these with our circular metal roll shear knives. In many cases, a small change in steel grade, hardness or chamfer already improves life and stability.

 

You receive OEM replacement circular shear knives that fit the roll shear shaft, match your spacers and work with your existing set-up. The goal is to change as little as possible on the machine while lifting performance.

 

 

Our circular roll shear knife for metal runs in several typical environments:

 

• Rolling shear knives for steel mill entry or exit side
• Coil preparation lines in "formal steel factory" for width trimming
• Tube and pipe mills cutting strip before forming
• Slitting machine manufacturers who integrate the roll shear into a full line

 

In a hot or cold rolling mill, the roll shear often trims edges or cuts the strip before coiling. The circular rotary shear knives for steel coil must handle scale, surface defects and varying strip thickness. In tube mills, they cut narrower strip for pipe forming and see frequent width changes.

All these uses have one common point: the knives work every shift. They see continuous load, not just short campaigns. This is why you need circular metal roll shear knives with correct steel, hardness and tolerances, not only a ring that "fits" mechanically.

 

 

A roll shear uses two circular metal roll shear knives mounted on shafts. The knives overlap slightly and cut the strip in a rolling action, not in a straight chop. This rolling motion reduces cutting force and gives a smoother edge when everything is set correctly.

To keep this effect stable, the knife must:

 

• Stay flat over its full face
• Hold a round, true bore for precise mounting
• Keep the edge geometry during the whole life

 

Poor flatness or wrong crown leads to uneven gap across the face. The result is burr on one side, strip marks or heating in one area. With well-made circular roll shear knife for metal, operators can set the knives once and then run longer without chasing the gap.

 

 

We supply circular metal roll shear knives in several tool steels to match different lines and materials:

 

• Cr12MoV / D2 – good wear resistance for many cold slitting and trimming jobs on carbon steel and coated strip.
• H13 – hot work steel for higher temperature and impact, suitable when the roll shear works close to a hot process.
• HSS (High Speed Steel) – for very high wear resistance on clean strip, stainless or special alloys where tool life is critical.
• LD and similar grades – toughness-oriented grades for shock load and mixed conditions.

 

Typical hardness:

 

• 56–60 HRC for Cr12MoV / D2
• 56–58 HRC for H13 roll shear in higher impact cases
• 60–64 HRC for selected HSS grades

 

We choose steel and hardness according to your strip type, thickness range and line speed. This is how we treat circular rotary shear knives for steel coil as production tools, not just as catalog items.

 

 

Even the best tool steel fails if size and runout are not controlled. For this reason, we hold tight tolerances on OD, ID, thickness and flatness for our circular metal roll shear knives.

Good control of these values helps you:

 

• Set knife overlap with less trial and error
• Keep a uniform gap across the full face of the knife
• Reduce burr variation from coil to coil

 

A coil slitting roll shear blade with too much runout forces operators to close the gap more than needed to get a clean cut. That increases wear and risk of strip marks. With precise circular roll shear knife for metal, you can open the gap to the right value and still keep edge quality.

This tolerance control is one of the main reasons steel mills treat roll shear tools as critical industrial slitter knives, not as simple rings.

 

 

We manufacture circular metal roll shear knives for many mill types. Some common sizes (unit: mm) include:

 

Outside Diameter (OD)	Inside Diameter (ID)	Thickness
Φ180	Φ90	12–18
Φ220	Φ110	15–25
Φ260	Φ130	20–30

These examples show typical sizes for entry and exit rolling shear knives for steel mill applications. Tube mills often use smaller OD and different thickness ranges, while heavy plate mills use larger OD and thicker knives.

If your size is not listed, we can produce the knife according to your drawing or sample. As a producer of industrial replacement blades, we handle both standard and special dimensions.

 

 

When you ask for OEM replacement circular shear knives, we normally follow a simple process:

 

• You send us drawings or samples of the current knives.
• We confirm all key dimensions, steel grade and hardness.
• We check your strip type and common problems in production.
• We propose circular metal roll shear knives with the same or upgraded specification.

 

Custom options include:

 

• Steel grade change for longer life or higher toughness
• Hardness tuning for your specific material mix
• Edge profile or chamfer change for cleaner edge or lower burr

 

The result is a set of circular roll shear knife for metal that still fits the machine and spacers but performs better on your real material.

 

 

Every batch of circular metal roll shear knives goes through controlled steps:

 

• Raw material inspection and identification
• In-process checks during machining and heat treatment
• Final inspection on size, hardness, flatness and runout

 

We then pack the circular rotary shear knives for steel coil with rust protection and edge guards. Strong cartons or wooden cases protect the knives during transport. When you open the cases, you receive ready-to-install tools, not semi-finished parts.

 

For export orders, we can combine roll shear tools with industrial slitter knives and other metal cutting blades in one shipment. This reduces logistic cost and simplifies your purchase process.

 

 

 

 

 

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