ICDP Rolls (Indefinite Chilled Double Poured)
Vimco Rolls Pvt Ltd · Rolling mill rolls since 1972 · Dera Bassi, Punjab · ISO 9001:2015
Double poured rolls with a hard alloyed iron shell and a tough grey or nodular iron core, for intermediate and finishing stands of wire rod, TMT, structural and strip mills.
- Grades IC-III, IC-IV, IC-V
- Shell alloyed iron, bainitic matrix
- Core grey or nodular iron
- Bending 700-1000 N/mm²
What are ICDP rolls?
ICDP (Indefinite Chilled Double Poured) rolls, also called DPIC or double poured indefinite chilled rolls, have a hard alloyed iron working layer and a softer grey iron or nodular iron core. The two metals are poured separately, using a combination of spin and static casting, so each part of the roll does its own job.
The shell has a bainitic matrix in which the amount of flaky graphite gradually decreases towards the centre. The graphite improves thermal conductivity and roll life; the soft core gives fracture toughness. Together they give wear resistance, reliable toughness and a good surface finish on the rolled product.
Vimco Rolls is an ICDP rolls manufacturer and supplier, with three grades: IC-III, IC-IV and IC-V. Comparing with HSS? Read HSS vs ICDP rolls. It is part of the range we make as a rolling mill rolls manufacturer since 1972.
ICDP rolls at a glance
| Product | Indefinite Chilled Double Poured (ICDP) rolls |
|---|---|
| Grades | IC-III, IC-IV, IC-V |
| Shell | Hard alloyed iron, bainitic matrix with flake graphite |
| Core | Grey iron or nodular iron |
| Casting | Combination of spin and static casting |
| Tensile strength | 400-500 N/mm² |
| Bending strength | 700-1000 N/mm² |
| Mill stands | Intermediate and finishing stands of wire rod, TMT and structural mills; finishing stands of strip, sheet and flat mills |
Where ICDP rolls sit in a TMT bar or wire rod mill
ICDP rolls cover two stages of the mill: the intermediate stands and the finishing stands.
Roughing
Finishing block
ICDP roll applications
- Intermediate and finishing stands of wire rod mills
- Intermediate and finishing stands of TMT mills
- Intermediate and finishing stands of structural mills
- Finishing stands of strip, sheet and flat rolling mills
Why a double poured roll: hard shell, tough core
Hard alloyed iron
Bainitic matrix with flake graphite. Gives wear resistance where the roll meets the bar, and the graphite improves thermal conductivity and roll life.
Grey or nodular iron
A softer core gives the roll its fracture toughness, so it stands up to rolling loads.
Finish and integrity
Suited to stands where surface finish quality and roll integrity are critical.
Hardness from surface to core
The chart shows hardness against depth from the roll surface: it stays high through the working layer, then drops at around 40-50 mm depth into the softer core. The micrograph (100x) shows the shell structure.
ICDP roll grades and chemical composition
Three shell grades on a common core. From IC-III to IC-V, nickel and chromium rise; carbon stays at 3.0-3.6%.
| Grade | Part | C | Mn | Si | S | P | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|---|
| IC-III | Shell | 3.0-3.6 | 0.4-1.2 | 0.6-1.2 | 0.05 max | 0.05 max | 0.7-1.2 | 2.0-3.0 | 0.2-1.0 |
| IC-IV | Shell | 3.0-3.6 | 0.4-1.2 | 0.6-1.5 | 0.05 max | 0.05 max | 1.0-2.0 | 3.0-4.0 | 0.2-1.0 |
| IC-V | Shell | 3.0-3.6 | 0.4-1.2 | 0.6-1.5 | 0.05 max | 0.05 max | 1.0-2.0 | 3.0-4.8 | 0.2-2.0 |
| All grades | Core | 3.1-3.5 | 0.6-0.9 | 1.2-1.5 | 0.05 max | 0.05 max | 0.2-0.5 | 0.4-1.0 | - |
Scroll the table sideways on a phone. Mechanical properties: tensile strength 400-500 N/mm², bending strength 700-1000 N/mm².
Our plant and quality lab
Vimco Rolls has made rolls since 1972. Our ICDP rolls are made at our own plant in Dera Bassi, near Chandigarh, which has its own melting shop, heat treatment and machine shop.
- Digital medium frequency induction furnace with ladle refining through argon purging
- Gas-fired annealing furnace for heat treatment
- CNC lathes and roll grinding machines
- All processes consistent with ISO 9001:2015
In-house testing lab
| Internal soundness | Ultrasonic testing machine |
|---|---|
| Hardness | Portable and laboratory hardness testers |
| Microstructure | Metallurgical microscope |
| Chemistry | Optical emission spectrometer, XRF analyser, wet analysis lab |
ICDP rolls for rolling mills in India and overseas
Vimco Rolls supplies rolls to rolling mills across India and exports overseas, shipping to mills from Georgia to South Africa and from Nepal to Saudi Arabia. Send your mill details, roll drawing and destination country with your enquiry, and we will quote for delivery to your mill.
Our clients
Vimco Rolls has supplied rolls to rolling mills since 1972. These are some of the steel makers we serve, mostly TMT bar and wire rod re-rolling mills.
Industries
Steel re-rolling: TMT bars, wire rods, sections, strip and plate.
Recent dispatch: a lot of ICDP rolls to a strip mill customer in Raipur.
ICDP rolls vs SGI acicular rolls
Every roll grade has its own place in the mill, so we compare ICDP rolls only with the rolls that run the same stands.
Both are options for the intermediate and finishing stands of TMT bar, wire rod and structural mills, and for the finishing stands of strip mills.
| Property | ICDP rolls (this page) | SGI acicular rolls |
|---|---|---|
| Material | Double poured: hard alloyed iron shell on a grey or nodular iron core | Spheroidal graphite (SG) iron |
| Microstructure | Bainitic shell with flake graphite | Nodular graphite and carbides in a bainitic (acicular) matrix |
| Grades | IC-III, IC-IV, IC-V | SGA-62, SGA-67, SGA-72 |
| Hardness / strength | Tensile 400-500 N/mm², bending 700-1000 N/mm² | 60-75 Shore C |
| Main alloying elements | Alloyed iron shell | Ni 2.0-3.4%, Mo 0.4-1.0%, Cr 0.4-0.8% |
| Main stands | Intermediate and finishing stands of wire rod, TMT bar and structural mills; finishing stands of strip, sheet and flat mills | Intermediate and finishing stands of TMT bar, rail, structural, wire rod and strip mills |
| Note | Spin and static casting combined | Needs sufficient water cooling in operation |
Which one suits your mill depends on the stand and the steel you roll. Send us the stand and grade and we will recommend one.
ICDP rolls: frequently asked questions
What are ICDP rolls?
ICDP rolls are Indefinite Chilled Double Poured rolls. They have a hard alloyed iron working layer (the shell) and a softer grey iron or nodular iron core, cast together using a combination of spin and static casting. The shell has a bainitic matrix with flake graphite, which gives wear resistance and good thermal conductivity, while the soft core gives fracture toughness.
What is the full form of ICDP roll?
ICDP roll full form: Indefinite Chilled Double Poured roll. ICDP stands for Indefinite Chilled Double Poured. 'Indefinite chilled' describes the shell iron, and 'double poured' means the shell and the core are poured as two separate metals.
What material is an ICDP roll made of?
An ICDP roll has two materials: a hard alloyed iron shell (3.0-3.6% carbon with nickel, chromium and molybdenum, in a bainitic matrix with flake graphite) and a softer grey iron or nodular iron core.
Which mill stands use ICDP rolls?
Intermediate and finishing stands of wire rod mills, TMT mills and structural mills, and finishing stands of strip, sheet and flat rolling mills.
What grades of ICDP rolls does Vimco make?
Three grades: IC-III, IC-IV and IC-V. All three have 3.0-3.6% carbon in the shell. Nickel rises from 2.0-3.0% in IC-III to 3.0-4.0% in IC-IV and 3.0-4.8% in IC-V, and chromium from 0.7-1.2% in IC-III to 1.0-2.0% in IC-IV and IC-V.
What is the chemical composition of an ICDP roll?
Shell (by grade): C 3.0-3.6%, Mn 0.4-1.2%, Si 0.6-1.5%, Cr 0.7-2.0%, Ni 2.0-4.8%, Mo 0.2-2.0%, S and P 0.05% max. Core: C 3.1-3.5%, Mn 0.6-0.9%, Si 1.2-1.5%, Cr 0.2-0.5%, Ni 0.4-1.0%. The full grade-by-grade table is on this page.
What are the mechanical properties of ICDP rolls?
Tensile strength 400-500 N/mm2 and bending strength 700-1000 N/mm2.
Why does an ICDP roll have a soft core?
The hard shell does the rolling and resists wear; the softer grey or nodular iron core gives the roll its toughness, so it resists fracture under rolling loads.
Should I use ICDP or HSS rolls in my finishing stands?
Both are used in finishing stands of TMT bar and wire rod mills. HSS rolls (80-85 Shore C) have a pass life estimated at 5-6 times that of conventional rolls; ICDP rolls are also used in intermediate stands and in strip, sheet and flat mills. Our guide HSS vs ICDP rolls compares them in detail, or send us your mill and stand details for a recommendation.
Who manufactures ICDP rolls in India?
Vimco Rolls Pvt Ltd manufactures ICDP rolls in grades IC-III, IC-IV and IC-V at its plant in Dera Bassi, Punjab. We have made rolling mill rolls since 1972, with processes consistent with ISO 9001:2015.
Do you export ICDP rolls?
Yes. Vimco Rolls supplies rolls to rolling mills across India and exports overseas, shipping to mills from Georgia to South Africa and from Nepal to Saudi Arabia. Share your destination country with your enquiry.
Which rolling mills does Vimco supply ICDP rolls to?
We supply ICDP rolls to wire rod, TMT bar and structural mills (intermediate and finishing stands) and to strip, sheet and flat mills (finishing stands). Recent dispatch: a lot of ICDP rolls to a strip mill customer in Raipur. You can see the mills we serve on our clients page.
Visit or contact our Dera Bassi plant
Haripur Hinduan Road, Village Sundran,
Dera Bassi, Punjab 140507, India
Phone: +91 9815627202, +91 9988222086
Email: info@vimcorolls.com, vimcorolls@gmail.com
Our plant is in Dera Bassi, near Chandigarh, Punjab.
Get a quote for ICDP Rolls
For a fast and accurate quote, include:
- Mill type (wire rod, TMT, structural, strip)
- Stand position (intermediate or finishing)
- Roll dimensions or drawing
- Grade (IC-III, IC-IV, IC-V), if known
- Quantity