Features and Benefits• Enhanced Semi HSS/HSS chemistry with enhanced alloy additions

and heat treatment for optimum wear performance and resistance to surface deterioration due to thermal cycling

• Superior product quality and reliability due to state-of-the-art manufacturing equipment and process

• Maximum product safety due to 100% automated EC/UT finish inspection

• Maximum reliability due to superior shell to core bonding technology resulting in avoidance of roll failures from interface issues

SHSSSemi-High Speed Steel

Union Electric AkersForged and Cast Rolls

™

Core Pouring Pipe

Sand Mold

Hematite Chill

Bonding Material Between Shell and Core

Sand Mold

Shell Material

T he Semi-High Speed Steel roll (SHSS) is the new standard in roughing mill work rolls for high

productivity mills requiring superior retention of surface finish and extended campaign lengths. We have engineered our SHSS Work Rolls using a carefully selected balance of chemistry and heat treatment to achieve superior retention of surface texture and resistance to thermal breakdown resulting in longer mill campaigns and higher roll performance than industry standard SHSS materials.

The Union Electric Åkers SHSS chemistry falls within the alloy content range of most competitors’ full HSS products and aims to meet or exceed comparable roll performances.

The Union Electric Åkers DifferenceOur SHSS Rolls are manufactured using a well-controlled casting technology. This highly engineered process ensures an exceptional bond between the shell and core materials, resulting in high strength layers that provide superior reliability against interface-related spalling and core fracture throughout the life of the roll.

At Union Electric Åkers we offer maximum product safety and reliability through consistent application of fully automated surface and subsurface inspection techniques.

Application: HOT MILL WORK ROLL

Category:

CAST ROLL

Mill Applications• WorkRollsfortheRoughingStandsofConventionalHotStripMillsandtheEarlyStandsofCSPMills

Manufacturing MethodDuplexverticalspuncast,hardenedanddoubletempered

Our customers have recognized that Union Electric Åkers leads the industry in safety, quality, reliability, and technology. We understand the importance of providing our customers with products that meet the highest tolerance specifications for the most demanding conditions and stringent applications in the metalworking industry. To meet the ever-increasing demands in the industry, we will continue to make investments in our manufacturing, R&D, and quality assurance.

We remain excited about the future and encourage you to visit our facilities to see for yourself the vast improvements that are taking place at Union Electric Åkers.

Contact your local Sales Representative to schedule your visit today!

SHSS SpecificationsAim Chemistry (Wt%)

C Si Mn Ni Cr Mo V W

1.5/2.0 0.5/1.5 0.5/1.5 0.5/1.5 3.0/8.0 1.0/3.0 1.0/3.0 1.0/3.0

MicrostructureThe superior wear and resistance to thermal fatigue of our SHSS material are achieved through a specific chemistry and microstructure design. The microstructure consists of a large volume of complex primary and secondary M7C3 and MC-type carbide in a matrix of well refined, lower bainite and martensite. The resulting material is similar in properties and characteristics of HiCr Steel and HSS, however the primary carbide network is more discontinuous than HiCr Steel, providing improved resistance to surface deterioration due to thermal cycling. The centerline and neck of the roll are designed using a spheroidal graphite iron to achieve high strength, ductility, and toughness.

Carbide Type Carbide Hardness (HV) Surface Area (%)

ComplexmixofM7C3+Mo2C+WC+VC

1200–1600(M7C3)1500(Mo2C)

2200–2800(WC+VC)

6-10%

Typical Carbide Analysis

Typical Depth of Hardness

Radial DepthNOTE: This is a generic chart. Exact hardness at discard diameter

will depend on the exact roll dimensions and usable life.

NEW DISCARD

Hardness vs Radial Depth

Hardness Upper Limit

Har

dnes

s H

Le

775

800

700

675

725

750

Hardness Lower Limit

UnionElectricÅkersistherecognizedgloballeaderinrolltechnologyforthemoststringentmillrequirements,superiorproductperformanceandworld-classcustomerservice.

For more information, please visit www.uniones.com.

Union Electric AkersForged and Cast Rolls

™