Forging Steel Back up Roll with Excellent Quality for Custom Made

• Customization: Available
• After-sales Service: Good
• Warranty: 1 Year
• Model NO.: OD300-3500
• Condition: New
• Certification: CE, ISO9001
• Standard: DIN, ASTM, GOST, GB, JIS, ANSI, BS
• Customized: Customized
• Material: Alloy
• Transport Package: Wooden Case
• Specification: OD350*5000
• Trademark: customed
• Origin: China
• Production Capacity: 1000pieces/Year

Product Description

Forged steel cold-rolled rolls include cold-rolled work rolls and backup rolls. The purpose of forged steel cold-rolled backup rolls is mainly to support the work rolls. Compared with the work rolls, the on-machine time is longer, usually more than 4 times that of the work rolls. It is in rolling contact with the work roll or intermediate roll for a long time, so the back-up roll body is required to have high rigidity, wear resistance and high contact fatigue strength.

At the same time, because the backup roller has a long machine cycle and the roll neck is subjected to alternating bending stress for a long time, it is required to have a good combination of strength and toughness.

 

1. Chemical composition

Steel grade	C	Si	Mn	P	S	Cr	Ni	Mo	V	Cu
45Cr4NiMoV	0.40-0.50	0.40-0.80	0.60-0.80	≤0.025	≤0.025	3.50-4.50	0.40-0.80	0.40-0.80	0.05-0.15	-
50Cr5MoV*	0.40-0.60	0.40-0.80	0.50-0.80	≤0.025	≤0.025	4.50-5.50	≤0.60	0.40-0.80	≤0.30	-
40Cr3MoV	0.35-0.45	0.40-0.80	0.50-0.80	≤0.025	≤0.025	3.00-4.00	≤0.30	0.50-0.80	≤0.30
9Cr2Mo	0.85-0.95	0.25-0.45	9.20-0.40	≤0.025	≤0.025	1.70-2.10	-	0.20-0.40	-	≤0.25
70Cr3NiMo	0.65-0.75	0.40-0.70	0.50-0.90	≤0.025	≤0.025	2.00-2.70	0.40-0.60	0.40-0.60	-	≤0.25
70Cr3Mo	0.58-0.75	0.40-0.70	0.50-0.80	≤0.025	≤0.025	2.00-3.50	≤0.60	0.25-0.60	-	≤0.25
55Cr	0.50-0.80	0.20-0.40	0.35-0.65	≤0.025	≤0.025	1.00-1.30	-		-	≤0.25
35CrMo	0.32-0.40	0.20-0.40	0.40-0.70	≤0.030	≤0.030	0.80-1.10	-	0.15-0.25		≤0.25
Note 1: 45Cr4NiMoV, 50Cr5MoV, 40Cr3MoV, 9CY2Mo, 70Cr3NiMo, and 70Cr3Mo are used for monolithically forged           backup rollers and nested backup rollers.   Note 2: 55Cr and 35CrMo are used for inserting the support roller core shaft.
*50Cr5MoV Ni can be adjusted. When using VOD, Si≤0.1%.

 

2.surface hardness

Usage	Roller body hs			Roll neck (bearing part)) Hs
	A	B	C
Hot rolled	60~70	50-60	40-50	35-50
Cold rolled	65-75	60-70	55-65

 

 

3.Effective hardened layer depth of roller body

Hardness HS	Steel grade %
	9Cr2Mo,70Cr3Mo 70Cr3NiMo 55Cr,35CrMa	50Cr5MoV	45Cr4NiMoV	40Cr3MoV
40-50	≥70	-	-	≥90
50-60	≥65	≥80	≥70	≥80
60-70	≥60	≥75	≥65	-
65-75	≥55	≥70	≥60	-

 

 

 

4.Allowable soft belt width on roll body surface

Roller length mm	≤1500	>1500-2000	≥2000
Allowed soft band width (not greater than) mm	60	80	100

 

5. Ultrasonic flaw detection

5.1 No cracks or white spots are allowed in any part of the entire roll.

5.2 For forged backup rollers, the surface layer 100mm deep from the surface of the roller body is not allowed to have defects greater than the equivalent diameter φ2mm.

5.3 Within the scope of other ultrasonic inspection areas, when a single defect wave continuously maintains F>1/2, the defect area of the defective part with a bottom wave B≤1/2 shall not be larger than 25cm'.

Note: F is the height of the defective wave, and B is the height of the bottom wave of the defective part.

5.4 For the roll sleeve of the inlaid backup roller, when a defect wave occurs, the AVG method should be used to calculate the size of the defect in the surface layer 100mm deep from the surface of the roll sleeve, and within the remaining depth range, which is the same as 4.4.2, and it should not be larger than the equivalent diameter. 3mm. 4.4.5 For support rollers without center holes, when excessive defects appear in the center, they can be removed by drilling a center through hole.

 

6 Surface quality

The surface of the roll should not have any visible defects such as dents, non-metallic inclusions, etc., and should comply with the surface roughness specified in the drawing.

 

FAQ

FAQ

1. who are we?
We are based in Jiangsu, China, start from 2008,sell to Domestic Market(36.00%),Eastern Europe(21.00%),Southeast Asia(16.00%),South America(12.00%),North America(9.00%),Northern Europe(4.00%),South Asia(2.00%). There are total about 51-100 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Forging Roll,Shaft,Hydraulic Cylinder, Hydraulic Baler, Hydraulic Shear

4. why should you buy from us not from other suppliers?
We have rich experience on casting, forging and heat treatment.
 

5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FAS,CIP,FCA,CPT,DEQ,DDP,DDU,Express Delivery,DAF,DES;
Accepted Payment Currency:USD,EUR,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Western Union;
Language Spoken:English,Chinese,Portuguese,Russian