Forged Rolls

Cluster Rolls / Sendzimir or Sundwig /

Ravne Rolls produce all kinds of rolls for cold mill Z Hi,2 Hi, 4 Hi, 6Hi, 12 Hi and 20 Hi

Production:

Work rolls (WR) from steel KOLD-12, KOLD-8, KOLD-8A, KOLD-M1, KOLD-MZ, KOLD-M3, KOLD-M4, KOLD-M5, KOLD-M7, KOLD-PM2, KOLD-PM3, KOLD-PM6
1st Intermediate rolls (1.IMR) from steel KOLD-12, KOLD-T2, KOLD-T5, KOLD-T8
2nd Intermediate rolls (2.|~\R) from steel KOLD-12, KOLD-T2, KOLD-T5, KOLD-T8

Steel grade is divided into three qualities:

Tool steel: KOLD-12, KOLD-T2, KOLD-T5, KOLD-T8
High speed steel: KOLD-M1, KOLD-MZ, KOLD-M3, KOLD-M4, KOLD-M5, KOLD-M7
PM steel: KOLD-PM2, KOLD-PM3, KOLD-PM6

The Tool steel and HSS are conventional type vacuum degassed steels that are also available for further refinement by ESR (Electro Slag Remelting). The PM (powder metallurgical) steel is produced by utilizing powder metallurgy technology which allows the design of high alloyed grades without uncontrolled growth of carbides. The WR in service exposure to mechanical and thermal stresses, various types of wear and local high pressure points put high demands on roll properties. For each application, the best compromise between resistance to indentations, abrasive wear and fatigue as well as sufficient toughness must be found. Through combining chemical composition, steel elaboration and heat treatment parameters, suitable roll properties can be reached.

IMR and Side support rolls (SSR)

Abrasive and corrosive wear accentuated by the longer trips, high pressure points, thermal and mechanical stresses put more emphasis on toughness and resistance to work hardening.

Cluster mill rolls are through-hardening rolls: 1st – max. hardening – subcooling temperature 1250°C, 2nd – oil pool or an air cooling system, 3rd – levelling system 4th – washing machine and 5th – tempering to max. 65O°C.

Cluster Strip Mill Rolls

Kolding – Ravne Rolls produce narrow strip mill rolls for 2-Hi, 4-Hi, 6-Hi and other mill configurations for rolling of strip and wire, made from carbon steels, stainless steels, non-ferrous metals, super alloys and precious metals. Through the long experience and wide portfolio of roll grades, RR can provide customized rolls for various customer needs.

Production:

Work rolls (WR) from steel KOLD-2, KOLD-ZA, KOLD-3, KOLD-3A, KOLD-4, KOLD-5, KOLD-TZ, KOLD-T5 (ESR)
Intermediate rolls (IMR) from steel KOLD-2, KOLD-3, KOLD-3A, KOLD-4, KOLD-5, KOLD-T5 (ESR)
Back-up rolls (BUR) from steel KOLD-3, KOLD-3A, KOLD-5, KOLD-T5 (ESR)

Steel grade is divided into two qualities:
– Tool steel: KOLD-T2, KOLD-T5
– Medium alloy steel: KOLD-2, KOLD-ZA, KOLD-3, KOLD-3A, KOLD-4, KOLD-5

Narrow strip from HSS and PM steel will probably be produced in the future.
The tool steel: Good wear and thermal shock resistance.
Medium alloy steel: For mills with general standards and demands. Selection of grade depends on the requested depth of hardness, wear resistance and roughness retention.
Strip mill rolls are surface hardening rolls: 1st – induction hardening to max. 1100 °C, 2nd – Sub-zero treatment to min. -160°C, 3rd – tempering to max. 650°C.

Depth of hardness to steel grade
	max. (mm)	(inch)
KOLD-2	12,5	0,5
KOLD-2A	12,5	0,5
KOLD-3	25,4	1,9
KOLD-3A	35,0	1,38
KOLD-4	38,0	1,5
KOLD-5	40,0	1,57
KOLD-T2	42,0	1,65
KOLD-T5	45,0	1,77

Aluminium Mill Rolls

Ravne Rolls has a long experience in the manufacture of WR, IMR and BUR in a wide range of grades for rolling of Aluminium on:

Hot 2-Hi and 4-Hi roughing, reversing and finishing mills
Cold 2-Hi, 4-Hi and 6-Hi breakdown, intermediate and finishing mills
Foil 4-Hi mills.

Production:

WR from steel KOLD-ZA, KOLD-3, KOLD-3A/ (ESR) Cold and foil mills /
WR from steel KOLD-T5 / (ESR) Hot mills
IMR from steel KOLD-ZA, KOLD-3, KOLD-3A and KOLD-5 / (ESR) Cold and foil mills
BUR from steel KOLD-3, KOLD-3A and KOLD-5 / (ESR) Cold and foil mills /
BUR from steel KOLD-T2 and KOLD-T5 / (ESR) Hot mills.

Steel grade is divided into two qualities:
– Tool steel: KOLD-T2, KOLD-T5
– Medium alloy steel: KOLD-ZA, KOLD-3, KOLD-3A, KOLD-5

HSS and SEMI HSS steel will probably be produced in the future.
The Tool steel: Good wear and thermal shock resistance.
Medium alloy steel: For mills with general standards and demands.
Selection of grade depends on the requested depth of hardness, wear resistance and roughness retention.

Aluminium mill rolls are surface hardening rolls: 1st – induction hardening to max. 1100°C
2nd – Sub-zero treatment to min. -16O°C and 3rd – tempering to max. 650°C.

Forming Rolls

Kolding – Ravne Rolls offer a dimensionally accurate range of Profile Forming Rolls that are durable in nature and are sturdy in construction. We manufacture the entire product range using quality assured raw components and the latest technologies. We deliver them in varied dimensions and thickness and they are valued with customized solutions.

We use the Tool steel KOLD-12, except for the Medium alloy steel KOLD-2, depending on the kind of hardening and the form of roll.

Features: Accurate dimensions, efficient working, longer service life.

Straightening Rolls

Roll-type straightening units and systems, their components and the results that can be achieved using them are increasingly moving to the center stage in the production and
processing of wire-shaped process materials.

We use the low alloy steel KOLD-1, KOLD-1A and KOLD-1B, except for the medium alloy steel KOLD-3, KOLD-5, depending on the type of straightening roll.

Features: Easy to maintain, rust proof, top quality.

Chemical composition of Steel Grades

Selection of Kolding / Ravne Rolls

Average analysis (%)

Hardness

RAVNE ROLLS

METAL RAVNE

STEEL NO. (W.Nr.)

DIN

UNS

SAE / AISI

HRC

KOLD-1
KOLD- 1 A
KOLD-1 B
KOLD-2
KOLD-ZA
KOLD-3
KOLD-3A
KOLD-4
KOLD-5
KOLD-T2
KOLD-T5
KOLD-T8
KOLD-12
KOLD-8
KOLD-8A
KOLD-M1
KOLD-M2
KOLD-M3
KOLD-M4
KOLD-M5
KOLD-M7
KOLD-PM2
KOLD-PM3
KOLD-PM6

OCR4ES
VCV150
VCMO14O
OHV-4
OHV-5
OTV-1
OTV-N
–
OTV-1 B
UTOPMO2
OV266
UTOPMO5
OCR12VM
OCR8VMS
OH255
BRM-1
BRN\-2
BRM-3
BRN\-4
BRU
BR885
RAVNE 23
RAVNE 30
RAVNE 60

1.3505
1.8159
1.7225
1.2327
–
–
–
–
–
1.2344
1.2362
–
1.2379
–
–
1.3346
1.3343
1.3344
1.3351
1.3207
1.3348
1.3344
1.3324
-

100Cr6
50CrV4
42CrMo4
86CrMoV7
–
–
–
–
–
X40CrMoV51
–
–
X155CrVMo12-1
–
–
S2-9-1
–
S6-5-3
–
S10-4-3-10
S2-9-2
S5-5-3
–
-

-
–
G41-400
–
–
–
–
–
–
T20813
–
–
–
–
–
T11301
T11302
–
–
–
T11307
–
–
-

52100
6145/6150
4140
–
–
–
–
–
–
/H113
A8/
–
/D2
–
–
H4 / M1
611 / M2
/M3/2
/M4
/T42
/M7
M3:2
M3C1.2+Co
-

1
0,5
0,4
0,85
0,9
0,8
0,82
0,82
0,8
0,4
0,7
0,6
1,53
0,9
1
0,83
0,9
1,2
1,3
1,25
1
1,2
1,25
2,2

1,5
1,05
1,1
1,8
2,2
3
3,1
4
5
5
5,1
8
12
8
8
4
4
4,1
4,2
4,15
4
4,1
4,2
4,2

–
–
–
0,2
0,35
0,3
0,65
0,3
0,3
0,3
0,15
0,25
0,4
0,25
0,3
–
–
–
–
–
–
–
–
-

–
–
0,2
0,25
0,3
0,4
0,35
0,5
0,25
1,4
1,1
1,3
1
1,5
2,5
8,5
5
5
4,5
3,5
8,5
5
5
7

–
0,18
–
0,08
0,15
0,1
0,1
0,05
0,05
1
0,45
0,6
0,85
2
0,3
1,2
2
3
4
3,25
1,8
3
3
6,5

–
–
–
–
–
–
–
–
–
–
–
1,1
–
–
–
1,7
6,5
6
5,5
9,5
1,7
6,5
6,5
6,5

-
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
10
–
–
8,5
10,5

<63
<62
<61
<67
<67
<67
<67
<67
<67
<55
<63
<61
<62
<63
<63
<66
<64
<66
<66
<66
<66
<67
<67
<67

Conversion table for hardness scales of Forged Rolls

VICKERS	ROCKVEL	SHORE		BRINELL	EQUOTIP		UTS
HV30	HRc	HSC/HSD	HFRSc/HFRSd	HB	HDL	HLE	N/mm²
ASTM E92	ASTM E18	JIS B7727	ASTM 4448 Forged	ASTM E10	ASTM A956	ASTM A956	DIN50150
940 920 900 880 860 840 820 800 780 760 740 720 700 680 660 640 620 600 580 560 540 520 500 480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 180	68 67,5 67 66,5 66 65,5 64,5 64 63,5 62,5 61,5 61 60 59,5 58,5 57,5 56,5 55,5 54 53 51,5 50,5 49 47,5 46 44,5 43 41 39 37 34,5 32,5 30 27 24 20,5 – – -	- 102 100,5 99 97 95,5 94 92,5 91 89,5 87,5 86 85 83,5 82 80,5 78,5 76,5 75 73 71 69 67 65 63 61 59 57 54 52 49 46,5 44 41,5 39 36 – – -	- 105 103 101 ,5 100 98,5 96,5 95 93,5 92 90,5 89 87 85,5 84 82,5 81 79 77,5 76 74,5 72,5 71 69 67,5 65 63 58 55,5 53,5 51 50 48 45 – – – – -	- – – – – – – – – – – – – – – 610 590 570 550 530 515 495 475 455 435 415 400 380 360 340 325 305 285 265 250 230 210 190 170	890 885 880 870 865 860 855 845 840 830 825 815 810 800 790 785 775 765 755 745 735 725 710 700 690 675 660 645 630 615 600 585 565 550 530 510 – – -	855 850 845 840 830 825 820 810 805 800 790 780 775 765 760 750 740 730 720 710 700 690 680 665 655 640 630 615 600 585 570 555 540 525 510 490 – – -	- – – – – – – – – – – – – – – 2145 2070 1995 1920 1845 1775 1700 1630 1555 1480 1420 1350 1300 1220 1155 1095 1030 965 900 835 770 705 640 575