Roll family 09 · Intermediate · finishing
High Speed Steel Rolls (HSS)
Centrifugally cast high speed steel shell for the longest wear life.
About this roll
HSS rolls: the material
A centrifugally cast shell of high speed steel over a tough core of SG iron or forged steel. The shell is alloyed with chromium, molybdenum, vanadium and tungsten (typically C 1.6–2.3%) and hardened to form very hard MC carbides in a tempered martensite matrix. This gives several times the wear life of indefinite chill or SGACC rolls, a stable roll surface through long campaigns, and good resistance to thermal cracking — used in intermediate and finishing stands of hot strip, bar and wire rod mills.
Where it works
Its place in the mill
-
Roughing: not usual here
Heavy passes, high loads
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Intermediate: used here
Shape and size take form
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Finishing: used here
Final size and surface
Metallurgy
Composition and properties
Ranges from our grade sheets. The exact composition is set for each order.
| Grade | C % | Si % | Mn % | Cr % | Ni % | Mo % | U.T.S. kg/mm² | Elong. % | Shore C (HSC) |
|---|---|---|---|---|---|---|---|---|---|
| HSS — Grade I | 1.80-2.30 | 0.50-1.00 | 0.30-0.80 | 4.50-5.00 | 0.50-1.00 | 4.50-5.00 | — | — | 75-80 |
| HSS — Grade II | 1.60-2.30 | 0.30-0.90 | 0.20-0.80 | 3.00-6.00 | — | 3.00-6.00 | — | — | 75-80 |
HSS — Grade I also: W 1.00–2.00 · V 5.00–5.50 %.
HSS — Grade II also: W 1.00–4.00 · V 2.00–6.00 · Nb 1.00–3.00 · S ≤ 0.03 %.
- Alloy cast steel 30–45
- Grey iron core 35–45
- SG iron core 35–45
- Adamite steel base 45–55
- SG pearlitic 45–55
- SG pearlitic (hard) 55–65
- Definite chill 55–70
- Indefinite chill 55–75
- SG acicular 65–75
- Non metal 65–75
- Definite chill (hard) 70–75
- DP shell I 70–75
- SG acicular (hard) 75–80
- DP shell II 75–80
- HSS I 75–80
- HSS II 75–80
- DP shell III 80–85
Recommended use
Where we recommend it
Mills and stands where this roll is the usual choice, with the barrel hardness we recommend.
| Rolled product | Type of mill | Stand and barrel hardness, Shore C |
|---|---|---|
| Flat products for steel mills | ||
| Wide Hot Strip | Continuous |
|
| Wide Hot Strip | Finishing Train |
|
| Wide Hot Strip | 4 High Reversing |
|
| Plates | 4 High |
|
| Shaped products for steel mills | ||
| Light Section Bar | 2 & 3 High |
|
| Medium & Light Sections | Continuous |
|
| Wire Rod | Continuous |
|
- Your roll drawing, or barrel and neck sizes
- Mill type and the stand for the roll
- Material rolled and the pass or groove
- Quantity and the date you need it
Our range
Other roll families
- 01 Clear chill rolls Finishing stands
- 02 Alloy cast steel rolls Roughing stands
- 03 Indefinite chill rolls Intermediate · finishing
- 04 Adamite rolls Roughing · section mills
- 05 Multi rolls Mixed schedules
- 06 Forged rolls Cold rolling · high duty
- 07 SG iron rolls Roughing · intermediate
- 08 SGACC rolls Intermediate · finishing
- 10 Metal rolls General applications
Need this roll for your mill?
Send your drawing or roll size — we will quote by return.