Pearlitic SG (Spheroidal Graphite)
Pearlitic SG rolls are classified as indefinite chill-type materials designed to deliver a balanced combination of strength, wear resistance, and thermal stability. Their microstructure consists of nodular (spheroidal) graphite and carbides uniformly distributed within a pearlitic matrix, providing excellent mechanical integrity and controlled hardness penetration.
The presence of spheroidal graphite improves toughness and reduces stress concentration, enhancing resistance to thermal fatigue and fire-cracking—particularly when softer grades are selected for demanding rolling conditions.
| HS Range | C | Mn | Si | Ni | Cr | Mo | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|
|
40 – 50 |
Min |
3.0 |
0.3 |
1.5 |
1.5 |
0.2 |
0.2 |
40 |
|
|
Max |
3.5 |
0.6 |
2.3 |
2.0 |
0.5 |
0.4 |
60 |
|
50 – 60 |
Min |
3.0 |
0.3 |
1.5 |
1.5 |
0.2 |
0.2 |
40 |
|
|
Max |
3.6 |
0.6 |
2.3 |
2.2 |
0.5 |
0.4 |
60 |
|
60 – 70 |
Min |
3.1 |
0.5 |
1.2 |
1.5 |
0.3 |
0.2 |
40 |
|
|
Max |
3.6 |
1.0 |
1.7 |
2.4 |
0.7 |
0.6 |
60 |
|
70 – 80 |
Min |
3.1 |
0.5 |
1.2 |
1.5 |
0.3 |
0.3 |
40 |
|
|
Max |
3.6 |
1.0 |
1.7 |
2.8 |
0.8 |
0.6 |
60 |
Bainitic Acicular SG
Bainitic Acicular SG rolls are engineered with a nodular graphite structure embedded within an acicular (needle-like) bainitic matrix. The microstructure contains an increased volume of hard carbides along with controlled martensitic phases, resulting in a material that delivers outstanding strength and wear resistance.
The acicular bainitic matrix enhances mechanical toughness while maintaining high surface hardness. This balanced metallurgical design provides superior resistance to abrasion, thermal fatigue, and surface degradation under demanding rolling conditions.
| Material | HS Range | C | Mn | Si | Ni | Cr | Mo | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|---|
|
Bainitic Acicular
|
40 – 50 |
Min |
3.0 |
0.3 |
1.6 |
1.5 |
0.2 |
0.4 |
60 |
|
|
|
Max |
3.5 |
0.6 |
2.3 |
3.0 |
0.5 |
0.9 |
80 |
|
Bainitic Acicular |
50 – 60 |
Min |
3.0 |
0.3 |
1.4 |
1.6 |
0.2 |
0.4 |
55 |
|
|
|
Max |
3.5 |
0.7 |
2.3 |
3.0 |
0.5 |
0.9 |
75 |
|
Bainitic Acicular |
60 – 70 |
Min |
3.1 |
0.5 |
1.2 |
2.0 |
0.3 |
0.4 |
50 |
|
|
|
Max |
3.6 |
0.8 |
2.0 |
3.0 |
0.8 |
0.9 |
70 |
|
Sp. Bainitic Acicular |
60 – 70 |
Min |
3.1 |
0.5 |
1.2 |
3.0 |
0.4 |
0.6 |
50 |
|
|
|
Max |
3.6 |
0.8 |
2.0 |
4.0 |
0.6 |
0.9 |
70 |
|
Sp. Bainitic Acicular |
70 – 80 |
min |
3.1 |
0.5 |
1.2 |
3.5 |
0.4 |
0.6 |
50 |
|
|
|
Max |
3.6 |
0.8 |
2.0 |
4.0 |
0.6 |
1.0 |
70 |
Deep Groove SG
Deep Groove SG rolls are manufactured with a nodular graphite structure designed to deliver exceptional strength and durability in demanding rolling conditions. The controlled microstructure ensures reliable hardness penetration and superior wear resistance, particularly at greater working depths.
This grade is specifically developed for applications involving heavy sections and deep groove profiles, where rolls are subjected to high mechanical loads and intense wear. The optimized alloy composition provides consistent performance, even under prolonged rolling campaigns.
| HS Range | C | Mn | Si | Ni | Cr | Mo | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|
|
60 – 70
|
Min |
3.0 |
0.3 |
1.5 |
2.0 |
0.6 |
0.3 |
60 |
|
|
Max |
3.5 |
0.6 |
2.2 |
3.0 |
0.9 |
0.5 |
80 |
|
70 – 80 |
Min |
3.0 |
0.3 |
1.5 |
2.2 |
0.6 |
0.3 |
55 |
|
|
Max |
3.5 |
0.7 |
2.0 |
3.0 |
0.9 |
0.5 |
75 |
Ferritic SG
Deep Groove SG rolls are manufactured with a nodular graphite structure designed to deliver exceptional strength and durability in demanding rolling conditions. The controlled microstructure ensures reliable hardness penetration and superior wear resistance, particularly at greater working depths.
This grade is specifically developed for applications involving heavy sections and deep groove profiles, where rolls are subjected to high mechanical loads and intense wear. The optimized alloy composition provides consistent performance, even under prolonged rolling campaigns.
| HS Range | C | Mn | Si | Ni | Cr | Mo | UTS Kgf/mm² | |
|---|---|---|---|---|---|---|---|---|
|
40 – 55
|
Min |
2.8 |
0.4 |
1.5 |
1.5 |
0.3 |
0.5 |
45 |
|
|
Max |
3.5 |
0.65 |
2.5 |
2.8 |
<= 2 |
1 |
70 |