The Alloyed Steel Base microstructure consists of ferrite, pearlite and even some bainite for the higher carbon grades. These materials have no fall-off in hardness with increasing depth. This material has improved
Toughness and is typically used in the breakdown, roughing & intermediate mills for bloom, billet & sections and for finishing heavy sections.
| HS Range | C | Mn | Si | Ni | Cr | Mo | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|
|
35 – 45 |
Min |
0.8 |
0.6 |
0.3 |
0.2 |
0.8 |
0.2 |
35 |
|
|
Max |
1.5 |
0.9 |
0.6 |
1.0 |
1.2 |
0.5 |
70 |
|
45 – 55 |
Min |
1.2 |
0.6 |
0.3 |
0.2 |
0.8 |
0.2 |
35 |
|
|
Max |
1.8 |
0.9 |
0.6 |
1.2 |
1.5 |
0.5 |
70 |
The Graphitic Steel consists of a controlled amount of fine flake graphite particles dispersed throughout the structure. It has improved the fire-crack resistance as the free graphite reduces the impact of thermal shocks. It is
mostly used for almost any size of the section, especially in applications where wear resistance is required and fire-cracking is a problem.
| HS Range | C | Mn | Si | Ni | Cr | Mo | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|
|
40 – 55 |
Min |
1.4 |
0.6 |
1 |
1 |
0.9 |
0.3 |
60 |
|
|
Max |
2.2 |
0.9 |
1.6 |
1.5 |
1.5 |
0.5 |
80 |
High-Speed Steel (HSS) rolls are composed of a high alloy and high carbon HSS outer shell with a nodular iron core. The HSS material’s microstructure comprises a tempered martensitic matrix that contains finely dispersed MC, M2C, and M6C carbides in significant amounts. They also provide exceptional features such as improved high-temperature strength, hot hardness, wear & oxidation resistance, excellent smooth surface high fire crack resistance & a very fine fire crack pattern. Additionally, they can even sustain multiple campaigns without requiring regrinding under suitable testing conditions.
High-Speed Steel (HSS) rolls are composed of a high alloy and high carbon HSS outer shell with a nodular iron core. The HSS material’s microstructure comprises a tempered martensitic matrix that contains finely dispersed MC,
M2C, and M6C carbides in significant amounts. They also provide exceptional features such as improved high-temperature strength, hot hardness, wear & oxidation resistance, excellent smooth surface high fire crack resistance & a very fine fire crack pattern. Additionally, they can even sustain multiple campaigns without requiring regrinding under suitable testing conditions.
| HS Range | C | Mn | Si | Ni | Cr | Mo | V | W | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|---|---|
|
75-85
|
Min |
1.5 |
0.3 |
0.4 |
0.0 |
3.0 |
2.0 |
2.0 |
0.0 |
71 |
|
|
Max |
2.2 |
1.0 |
1.2 |
1.5 |
8.0 |
8.0 |
9.0 |
2.0 |
75 |
|
45 – 55 |
Min |
0.6 |
0.8 |
0.5 |
0.2 |
3.0 |
2.0 |
0.4 |
0.0 |
41 |
|
|
Max |
1.2 |
1.5 |
1.0 |
1.2 |
9.0 |
5.0 |
3.0 |
3.0 |
45 |
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