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Technique for controlling size scatter difference of bearing steel of hot-rolled round steel

A process method, bearing steel technology, applied in the field of metallurgy, can solve the problems of exceeding customer size dispersion requirements, ring cracks, stuck steel KOCKS rolls, etc.

Active Publication Date: 2019-10-11
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Purpose of the invention: the present invention provides a process method for controlling the dimensional dispersion of the hot-rolled round steel bearing steel. The temperature is high and the size fluctuates greatly, and the same batch exceeds the customer's size dispersion requirements.

Method used

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  • Technique for controlling size scatter difference of bearing steel of hot-rolled round steel
  • Technique for controlling size scatter difference of bearing steel of hot-rolled round steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] Embodiment: (1) When producing SUJ2S1, 180*180GCr15-X1 blank is used as the size, the temperature of the water tank is adjusted, and the number of pieces is more than or equal to 10 pieces.

[0042] (2) The tapping rhythm of the heating furnace is 90s / step.

[0043] (3) The looper is used according to the specifications and process requirements, and 1#~7# loopers are used.

[0044] (4) The head and tail are collected separately, such as figure 1 as shown,

[0045] Head = 6m, tail = 6m, each billet needs to collect 2 pieces of 6m separately.

[0046] (5) Spot check of offline size.

[0047] Dimensional dispersion = 36.35-36.10 = 0.25mm, which meets the requirements of the same batch of dimension dispersion ≤ 0.30mm, as shown in Figure 2.

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Abstract

The invention discloses a technique for controlling the size scatter difference of bearing steel of hot-rolled round steel. The technique comprises the steps of (1) controlling the scatter differenceof the head and tail of the round steel; (2) controlling the size scatter difference of the middle part. According to the technique, the parts with high temperature of the head and tail are independently collected on line and are measured one by one in an offline mode, and the middle part is treated by organizing a debugging material, uniformly tapping, using a looper and specifying a measuring tool, so that the scatter difference of the whole batch is less than or equal to 0.30 mm, and the operating requirement of a customer is satisfied.

Description

technical field [0001] The invention relates to a rolling process in the field of metallurgy, in particular to a process method for controlling the size dispersion of bearing steel by hot-rolling round steel. Background technique [0002] The production process of bearing steel requires controlled rolling and controlled cooling. During controlled rolling, due to the low temperature of the head and tail, it is easy to cause the steel jam accident that the head does not bite and the KOCKS roll ring crack accident, resulting in the loss of manpower, time and materials. In order to improve this problem, the head and tail do not penetrate water to increase the temperature of the head and tail, but it also brings about the problem that the temperature of the head and tail is high and the size fluctuates greatly, and the same batch exceeds the customer's size dispersion requirements. Contents of the invention [0003] Purpose of the invention: the present invention provides a pro...

Claims

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Application Information

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IPC IPC(8): B21B37/70
CPCB21B37/70
Inventor 徐伟
Owner NANJING IRON & STEEL CO LTD
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