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steel rolling mill sleeve

Product description: Heat treatment: The spule should be processed by Centrifugal casting is the casting method of pouring liquid metal into rotating casting, filling and solidifying into casting by centrifugal force. The metal retraction are good, the casting is dense and the mechanical...
Product Details:

Description

Spools, also known as winding spools or occasionally rolling mill sleeves, are thick-walled tubes used for winding thin aluminium strips, aluminium foil or stainless steel thin sheet metal for transportation in the manufacturing process and storage. The wound metal is called a coil. 


Product advantages

(1) Adopting the centrifugal casting process to achieve high density of materials. 

(2) Use the special tool to process end face, taper and the outer circle according to inner hole to ensure beating of the taper, the concentricity and cylindricity of the steel spool.

(3)Selected materials: ZG35,KCP-12 and other high temperature resistant material,non-deformable alloy steel.


Heat treatment of steel sleeve:

Heat treatment is putting products after rough machining  in a certain medium to change the surface or internal micro structure, and control the performance of a product by  heating, heat preservation, cooling. Basic process of heat treatment: annealing, normalizing and tempering.

1. Annealing

 Annealing is to heat the steel core to the appropriate temperature and then slowly cool the steel core to achieve or close to the equilibrium state.

2. Normalizing 

Normalizing is making steel core cool after it reaches suitable temperature, the effect of normalizing  is similar to annealing, commonly used to improve the cutting performance of material, also sometimes used for low requirements for some parts as the final heat treatment.

3. Quenching

 Quenching is the rapid cooling process in the quenching medium of water, oil or other organic salts and organic water, after the heating of work piece. The steel is hardened after quenching, but it is brittle at the same time.

4.Tempering 

Tempering is in order to reduce the brittleness of steel core. Place the steelcore which is after quenching in higher than the room temperature and under 650 ℃  for a long time of heat preservation,  cooling again , this process is called tempering.





Elements

 

Materials

C

Si

Mn

Cr

Ni

Mo

v

S,P

Introduction

 

ZG310-570

0.50

0.6

0.90





≤0.040

Low plasticity and toughness, low temperature resistance, low  cost.

 

35CrMo

0.32-0.40

0.17-0.37

0.40-0.70

0.80-1.10


0.15-0.25


≤0.035

High strength, toughness and hardness, high temperature resistance, low cost

 

35CrMov

0.30-0.38

0.17-0.37

0.40-0.70

1.00-1.30


0.20-0.30

0.10-0.20

≤0.035

Better than 35CrMo performance, low cost

 

35NiCrMo

0.30-0.37

0.6-0.9

0.40-0.90

0.40-0.90

0.60-0.90

0.40-0.50


≤0.035

High strength and toughness, high temperature resistance, high cost

 

KCP-12

0.20-0.30

≤0.60

0.90-1.10

0.40-0.90

1.00-1.50

0.30-0.50


≤0.040

High strength and toughness, high temperature resistance, high cost




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