Our company is specialized in manufacturing various kinds of forged steel roll, shaft and other metallurgy equipment. The overall production capability is ten-thousand tons containing three thousand tons forged steel roll.
Our mainly products includes cold rolling and forged steel working rollers、intermediate rollers、supporting rollers、skin pass rollers and straightening rollers, forged steel and hot rolling working roller.
The materials of old rolling and forged stee rollers contain 9Cr2Mo、86CrMoVT、MC3、MC5、Cr12Mo1VCo etc.,moreover, hot rolling and forged steel rollers contain 60CrMnMo、70Cr3Mo etc..Our can rationally select material in accordance with our users'requirements and their rolling mill condition.
PRODUCTS & PARAMETER
Main-Spec. technical parameters of cold forged steel rolls:
A、Max Dia. Of roll body：2000mm.
B、Materials:
The materials of GB/T13314-91standard: 86CrMoV7、9Cr2Mo、9Cr2W；MC3（3％Cr）、MC5（5％Cr）, semi-HSS etc.
C、Work hardness:
Surface hardness of work roll body (HSD):
|
Order
|
Surface hardness of roll body
|
Usage
|
|
1
|
≥95
|
Skin rolling bed plate and finish rolling bed plate work roll
|
|
2
|
90-96
|
Metal plate, cold forged work roll with strap shaped materials
|
|
3
|
75-90
|
Metal plate, rough forged work roll with strap shaped materials
|
Surface hardness of work roll neck (HSD):
|
Order Number
|
Surface hardness of roll neck
|
|
1
|
30-50
|
|
2
|
50-65
|
|
3
|
75-90
|
Reasonable Soft width of two sides of roll body (MM)
|
Length of roll body
|
≦300
|
301-600
|
601-1000
|
1001-2000
|
≥2000
|
|
Reasonable Soft width of each side of roll body ≦
|
30
|
50
|
60
|
65
|
80
|
D、Effective hardening depth of work rolls
d-1、Classifications according to dia. Of roll body:
|
Order
|
Dia. Of roll body (mm)
|
Hardness scale of roll body surface (HSD)
|
Effective depth not less than(mm )
|
|
1
|
≦300
|
≥95
|
6
|
|
90-96
|
8
|
|
75-90
|
10
|
|
2
|
301-500
|
≥95
|
7
|
|
90-96
|
12
|
|
75-90
|
14
|
|
3
|
>500
|
≥95
|
8
|
|
90-96
|
13
|
|
75-90
|
15
|
d-2、Classifications according to materials:
|
Order
|
Material
|
Depth of Hardness （mm）
|
|
1
|
Series-2％Cr
|
12-18
|
|
2
|
Series MC3-3％Cr
|
18-35
|
|
3
|
Series MC5-5％Cr
|
20-40
|
E、Technology requirements of production process
E-1. Machining according to the drawing.
E-2. Test of surface dimensions according to drawing，roughness test according to roughmeter. Ultrasonic testing according to GB/T13315-91 A grade, Surface magnetic particle test according to JB/T5000.15-1998 Ⅳ grade. Hardness test according to Leeb hardness tester.
E-3. Two steps of heat treatment:
e.3.1. Heat treatment according to vertical pit furnace，improve work statement，adjust mechanical properties，prepare for terminal heat treatment(surface quench)
e.3.2 Surface quenching is processing on dual-frequency quenching machine，which satisfy the requirements of surface hardness and depth of hardening level.
e.3.3 tempering is processing on bellows furnace，the purpose is for cancelling the stress of surface quenching and stress of processing. 
|
