Forged Steel Rolls rolling mill steel grade Cr1 Cr 2 Cr 3 Cr 5 Cr
12
1.Production equipment:
1.1 Introduction furnace: 25tx8sets, 10t/3tx5sets
1.2 EAF: 30tx5sets
1.3 Ladle furnace: 50-70tx8sets
1.4 Large send Foundry equipment: 20 sets
1.5 Large & Middle size heat treatment: 50 sets
1.6 Large & Middle size centrifugal casting machine: 20 sets
1.7 Large & Middle size CNC & Heavy machine: 235 sets
1.8 Testing equipment: 35 sets
2. Production capacity: 150000Tons/Annual
2.1TYPE & Size:
2.1.1Cast roll & RING:
Backup roll: Max. Dia. 2000mm; Max weight 80t/pc,
Work roll: Max. Dia. 1600mm; Max. Barrel length 6500mm;
Max weight 85t/pc
Others: as per customer’s requirement.
2.1.2 Forged roll & RING:
Work roll for Cold Rolling mill: Max. Dia. 1100mm; Max weight
25t/pc,
Work roll for Hot Rolling mill: Max. Dia. 1600mm; Max weight 75t/pc
Backup roll for Hot Rolling mill: Max. Dia. 2000mm; Max weight
75t/pc
Others: as per customer’s requirement.
3. Forging
The qualified steel ingot is pressed to the roll blank by the
hydraulic forging machine after pre-heating, heating and even
heating.
The purpose of forging and pressing process is: the forging and
pressing can reduce and compress the porosity, shrinkage and some
pore; improve the macroscopic segregation (pattern segregation, V
shape segregation) in the original structure of the steel ingot;
shatter the gross liquation carbide and net carbide; crush and
refine the gross grain.
In order to acquire the optimized feature of the roll, we strictly
control the forging ratio , not less than 3 for work rolls while
more than 2.5 for large size backup rolls.
4. Electro Slag Remelting
Electro slag remelting (ESR) is a specialized steel-making process
in which a cast ingot in the form of an electrode is re-melted in a
water-cooled copper mould. The melting is activated by resistive
heat generated in a conductive slag.
Charactersistics of ESR:
1. No macroscopic segregation and few microscopic segregation. Very
few and subtle non-metal inclusion; dispersed distribution.
2. Compact and homogeneous structure
3. High toughness and strength
4. Beneficial for improvement of anti-fatigue and heat impact
ability of the roll
FORGED STEEL ROLL
| Material | Steel Grade | Chemical coposition % | Application |
| C | Cr | Mo | V | Ni | Mn | Co | W | |
| Cr1 | GCr15 | 0.95-1.05 | 1.3-1.65 | | | ≤0.4 | | | | Work roll of Cold mill Straightenning roll Pinch roll |
| 9CrV | 0.85-0.95 | 1.4-1.7 | | 0.1-0.25 | ≤0.25 | | | |
| 42CrMo | 0.38-0.45 | 0.9-1.2 | 0.15-0.25 | | | | | | Work roll & Backup roll for Hot rolling mill |
| 60CrMo | 0.55-0.65 | 0.5-0.8 | 0.3-0.4 | | | | | |
| 60CrMnMo | 0.55-0.65 | 0.8-1.2 | 0.3-0.4 | | | 0.7-1.0 | | |
| 60CrMoV | 0.55-0.65 | 0.9-1.2 | 0.3-0.4 | 0.15-0.35 | | | | | Straightenning roll Pinch roll |
| Cr2 | 9Cr2Mo | 0.85-0.95 | 1.7-2.1 | 0.2-0.4 | | | | | | Work roll, Middle roll, Backup roll for Cold Rolling mill |
| 86CrMoV7 | 0.82-0.9 | 1.8-2.2 | 0.2-0.4 | 0.1-0.2 | | | | |
| 9Cr2MoV | 0.85-0.95 | 1.7-2.1 | 0.2-0.3 | 0.1-0.2 | | | | |
| Cr3 | 9Cr3Mo | 0.85-0.95 | 2.5-3.5 | 0.2-0.4 | | | | | | Work roll, Middle roll, Backup roll for Cold Rolling mill (high quenching, deep hard layer) |
| MC3A | 0.8-0.88 | 2.8-3.2 | 0.4-0.6 | 0.05-0.12 | 0.6-0.8 | | | |
| MC3B | 0.82-0.9 | 2.7-3.1 | 0.1-0.3 | 0.05-0.12 | 0.2-0.4 | | | |
| 70Cr3Mo | 0.6-0.75 | 2.0-3.5 | 0.25-0.6 | | | | | | Work roll, Middle roll, Backup roll for Hot Rolling mill (high quenching, deep hard layer) |
| 70Cr3NiMo | 0.6-0.8 | 2.0-3.0 | 0.25-0.6 | | 0.4-0.6 | | | |
| Cr5 | MC5 | 0.82-0.9 | 5-5.4 | 0.2-0.4 | 0.1-0.2 | 0.3-0.5 | | | | Work roll for Cold Rolling mill (high quenching, deep hard layer) |
| MC5A | 0.77-0.84 | 5-5.4 | 0.3-0.5 | 0.1-0.2 | 0.3-0.5 | | | |
| Cr12 | Cr12MoV | 1.45-1.7 | 11-12.5 | 0.4-0.6 | 0.15-0.3 | | | | | Work roll, Middle roll for Multi-roll Rolling mill |
| Cr12Mo1V1 | 1.4-1.6 | 11-13 | 0.7-1.2 | ≤1.1 | | | ≤1.0 | |
| Cr12MoVCo | 1.4-1.6 | 11-13 | 0.8-1.2 | 0.75-0.95 | | | 0.3-0.5 | |
| W steel | W6Mo5Cr4V2 | 0.8-0.9 | 3.8-4.0 | 4.5-5.5 | 1.75-2.25 | | | | 5.5-6.75 | Work roll for Multi-roll Rolling mill |
| W12Cr4V5Co5 | 1.5-1.6 | 3.75-5.0 | ≤1.0 | 4.5-5.25 | | | 4.75-5.25 | 11.75-13 |
