Method for controlling close limit hardness of steel used for compressor shell

A technology of hardness control and compressor, which is applied in the field of metal rolling, can solve the problems of no demoulding, unsystematic introduction of surface hardness control measures for hot-rolled pickling low-carbon steel, and high hardness of steel coils, so as to eliminate the impact , Inhibit the migration of elements and reduce the effect of secondary cementite precipitation at the grain boundary

Active Publication Date: 2019-03-01
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to obtain hot-rolled pickled low-carbon steel with good stamping performance, iron and steel enterprises currently mainly use two component systems of low-carbon and low-manganese and micro-carbon and low-manganese, and add the "two-component system" of high final rolling temperature, low cooling speed and high coiling temperature. High-low" rolling mode to obtain a relatively coarse and uniform grain structure, improve the elongation and stamping performance of the steel coil, but different carbon content and different rolling processes lead to a wide range of hardness fluctuations in the steel used for compressor shells. Big
[0004] Compressor shell manufacturers mainly use fixed abrasive stamping equipment to stamp steel for compressor shells. Smaller hardness of steel coils will easily lead to non-demolding and abnormal deformation after stamping. Higher hardness of steel coils will easily cause stamping cracks and molds. excessive wear
Therefore, some compressor shell manufacturers put forward surface hardness control requirements for purchased steel coils, but so far, iron and steel enterprises have not systematically proposed surface hardness control measures for hot-rolled pickled low-carbon steel

Method used

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  • Method for controlling close limit hardness of steel used for compressor shell
  • Method for controlling close limit hardness of steel used for compressor shell
  • Method for controlling close limit hardness of steel used for compressor shell

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Experimental program
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Embodiment 1

[0036] The steel used for the compressor casing in this embodiment is SPHC finished steel with a thickness of 3.0mm, and its chemical composition and mass percentage are: C: 0.023%, Si: 0.06%, Mn: 0.21%, P: 0.011%, S: 0.007%, Als: 0.026%, the rest is Fe and unavoidable impurities.

[0037] The production method of the steel SPHC for the compressor shell of this embodiment includes casting slab heating, controlled rolling, controlled cooling, and coiling processes, and the specific process steps are as follows:

[0038] (1) Slab heating process: the heating temperature of the slab is 1190°C, and the heating time is 210 minutes;

[0039] (2) Controlled rolling process: rough rolling passes 3+3, intermediate billet thickness 42mm, finish rolling entrance temperature 995°C, finish rolling temperature 879°C;

[0040] (3) Control the cooling process: laminar flow cooling is adopted, the cooling model adopts the centralized cooling mode in the front section, and the cooling rate is ...

Embodiment 2

[0044] The steel used for the compressor casing in this embodiment is SPHC finished steel with a thickness of 3.5mm, and its chemical composition and mass percentage are: C: 0.023%, Si: 0.06%, Mn: 0.21%, P: 0.011%, S: 0.007%, Als: 0.026%, the rest is Fe and unavoidable impurities.

[0045] The production method of the steel SPHC for the compressor shell of this embodiment includes casting slab heating, controlled rolling, controlled cooling, and coiling processes, and the specific process steps are as follows:

[0046] (1) Slab heating process: the heating temperature of the slab is 1192°C, and the heating time is 215 minutes;

[0047] (2) Controlled rolling process: 3+3 rough rolling passes, intermediate billet thickness 42mm, finish rolling entrance temperature 998°C, final rolling temperature 882°C;

[0048] (3) Control the cooling process: laminar flow cooling is adopted, and the cooling model adopts the centralized cooling mode in the front section, and the cooling rate ...

Embodiment 3

[0052] The steel used for the compressor casing in this embodiment is SPHC finished steel with a thickness of 3.0mm, and its chemical composition and mass percentage are: C: 0.023%, Si: 0.06%, Mn: 0.21%, P: 0.011%, S: 0.007%, Als: 0.026%, the rest is Fe and unavoidable impurities.

[0053]The production method of the steel SPHC for the compressor shell of this embodiment includes casting slab heating, controlled rolling, controlled cooling, and coiling processes, and the specific process steps are as follows:

[0054] (1) Slab heating process: the heating temperature of the slab is 1196°C, and the heating time is 206 minutes;

[0055] (2) Controlled rolling process: rough rolling passes 3+3, intermediate billet thickness 42mm, finish rolling entrance temperature 1005°C, finish rolling temperature 876°C;

[0056] (3) Control the cooling process: laminar flow cooling is adopted, the cooling model adopts the centralized cooling mode in the front section, and the cooling rate is ...

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Abstract

The invention discloses a method for controlling close limit hardness of steel used for a compressor shell. The method comprises the processes of heating a casting blank, controlling rolling, controlling cooling and reeling; during the process of controlling rolling, roughing pass is 3+3 and thickness of intermediate billet is 38-45mm; during the process of controlling rolling, temperature at finish rolling inlet is at 980-1050 DEG C and finishing temperature is at 865-895 DEG C; during the process of reeling, reeling temperature is at 580-620 DEG C. According to the invention, a stable fine grain tissue is acquired through reasonable rolling pattern design and reeling temperature and by refining grain size; the influence of grain size fluctuation on hardness is eliminated; migratory movement of supersaturated C element is restrained by lower reeling temperature, secondary cementite separation on grain boundary is reduced and the influence of fluctuation of composition percentage of cementite caused by larger C content control scope on hardness of steel coil is eliminated.

Description

technical field [0001] The invention belongs to the technical field of metal rolling, and in particular relates to a method for controlling the hardness within a narrow range of steel used for compressor shells. Background technique [0002] The steel used for the compressor shell is a hot-rolled pickled low-carbon steel, which is mainly used in stamping to manufacture compressor shells for home appliances such as air conditioners and refrigerators. [0003] In order to obtain hot-rolled pickled low-carbon steel with good stamping performance, iron and steel enterprises currently mainly use two component systems of low-carbon and low-manganese and micro-carbon and low-manganese, and add the "two-component system" of high final rolling temperature, low cooling speed and high coiling temperature. High-low" rolling mode to obtain a relatively coarse and uniform grain structure, improve the elongation and stamping performance of the steel coil, but different carbon content and d...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06
CPCC21D8/0226C21D2211/003C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06
Inventor 韩健裴庆涛贾改风张志强孙毅李红俊王朔阳李斌
Owner HANDAN IRON & STEEL GROUP
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