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Cooling control process for preventing decarbonization of small-size spring steel

A technology for controlling cooling and spring steel, which is applied in the manufacture of tools, metal rolling, metal rolling, etc., can solve the problems of brittle fracture of small-sized spring steel, and achieve the effects of preventing brittle fracture, uniform structure, and avoiding structure segregation

Active Publication Date: 2013-03-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to propose a controlled cooling process to prevent decarburization of small-sized spring steel, which can solve the technical problem of brittle fracture of small-sized spring steel during drawing,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] This example is the controlled cooling process of 55SiCrA with a specification of Ф5.5, including the final rolling process, spinning process, and post-rolling cooling process. The final rolling temperature and spinning temperature of the rolling process are controlled within the range of 790°C by using a water-cooled box. , so that it is rolled and spun in the two-phase area to prepare for the cooling process; after spinning, it enters the Stelmo air-cooled line to start cooling, and the Stelmo air-cooled line fan and cover are all closed to make the coil The coil is in a slow cooling state in the air-cooled roller table, and the running speed of the Stelmo air-cooled roller table is set at the same time. The first roller table speed of the Stelmo air-cooled roller table is set at 15rpm, and the subsequent stage The roller tables are set to run at different speeds according to the odd and even numbers, and the even-numbered roller tables are set to 110% of the first rol...

Embodiment 2

[0012] This example is the controlled cooling process of 55SiCrA-M with a specification of Ф6.5, including the final rolling process, spinning process, and post-rolling cooling process. The final rolling temperature and spinning temperature of the rolling process are controlled at 800°C by using a water-cooled box. Within the range, it is rolled and spun in the two-phase area to prepare for the cooling process; after spinning, it enters the Stelmo air-cooled line to start cooling, and the Stelmo air-cooled line fans and covers are all closed. Make the coil in a slow cooling state in the air-cooled roller table, and set the running speed of the Stelmo air-cooled roller table at the same time. The first roller table speed of the Stelmo air-cooled roller table is set at 18rpm, and The rear section of the roller table is set to run at different speeds according to the odd and even numbers. The even number section of the roller table is set to 110% of the speed of the first roller t...

Embodiment 3

[0014] This example is the controlled cooling process of 55SiCrA-M with a specification of Ф6.0, including the final rolling process, spinning process, and post-rolling cooling process. The final rolling temperature and spinning temperature of the rolling process are controlled at 810°C by using a water-cooled box. Within the range, it is rolled and spun in the two-phase area to prepare for the cooling process; after spinning, it enters the Stelmo air-cooled line to start cooling, and the Stelmo air-cooled line fans and covers are all closed. Make the coil in a slow cooling state in the air-cooled roller table, and set the running speed of the Stelmo air-cooled roller table at the same time. The first roller table speed of the Stelmo air-cooled roller table is set at 20rpm, and its The rear section of the roller table is set to run at different speeds according to the odd and even numbers. The even number section of the roller table is set to 110% of the speed of the first roll...

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Abstract

The invention relates to a cooling control process in the field of metallurgy and a cooling control process for preventing decarbonization of small-size spring steel. The cooling control process comprises the following steps of: respectively controlling the finishing temperature and the spinning process within 800+ / -10DEG C; after spinning, closing all Stelmor fans and covers; meanwhile, setting operation speeds of Stelmor air-cooled roller tables; setting the rotating speed of a first roller table of the Stelmor air-cooled roller tables at 15-20rpm; setting the rotating speeds of roller tables on even number sections as 110 percent of the rotating speed of the first roller table; setting the rotating speeds of roller tables on odd number sections as 100 percent of the rotating speed of the first roller table; and controlling the temperature of the cover below 450DEG C to ensure that all phase changes of a pony roll in the air-cooled roller table are finished. According to the cooling control process disclosed by the invention, various part tissues in a finished product can be uniform, the structure segregation is avoided and the brittle failure of the small-size spring steel in the drawing process is prevented.

Description

technical field [0001] The invention relates to a controlled cooling process in the field of metallurgy, in particular to a controlled cooling process for preventing decarburization of small-sized spring steel. Background technique [0002] Spring steel should have high tensile strength limit, high hardness, yield limit, elastic limit and fatigue limit, as well as high impact toughness and plasticity. Spring materials under special conditions of use are also required to have heat resistance, anti-corrosion, electrical conductivity, anti-magnetic, low temperature resistance and constant elasticity. Spring is a commonly used elastic working element, and it is also the basic part of various mechanical equipment and instruments. [0003] In the manufacturing process of the spring, an external force needs to be applied to the wire to bend it into shape, and there are strict requirements on the composition, uniformity and state of the wire. The biggest problem restricting the sma...

Claims

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Application Information

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IPC IPC(8): B21B45/02
Inventor 刘宇宋立媛
Owner NANJING IRON & STEEL CO LTD
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