Unlock instant, AI-driven research and patent intelligence for your innovation.

Normalizing process of steel for automobile transmission shaft parts

A technology for transmission shafts and parts, which is applied in the field of normalizing process of steel for automobile transmission shaft parts, can solve the problems of long production cycle, high production cost, energy consumption, etc., reduce energy consumption and improve roll speed configuration , the effect of reducing production costs

Pending Publication Date: 2022-01-14
NANJING IRON & STEEL CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing normalizing process, there are problems such as slow furnace roll speed, long production cycle, energy consumption, and high production cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The content of each component in the steel is: C 0.50wt.%, Si 0.20wt.%, Mn 1.00wt.%, S0.015wt.%, P 0.02wt.%, Ni 0.1wt.%, Cr 0.1wt.%, Mo 0.05wt.%, Cu 0.15wt.%, Al 0.015wt.%, the balance is Fe and impurities.

[0015] The normalizing process of the present invention is adopted for processing: (1) the starting rolling temperature before normalizing is 980°C, the finishing rolling temperature is 800°C, and the hot-rolled hardness is 210-240HBW; (2) the roller hearth type continuous heat treatment furnace is adopted, the furnace The section is divided into 13 areas with a total length of 65m, among which, the length of areas 1-2 is 6m, the length of areas 3-6 is 4m, the length of area 7 is 7m, the length of area 8 is 4m, and the length of areas 9-10 is 5.5m. The length of zones 11-13 is 5m; the temperature of the roller hearth continuous heat treatment furnace is set as follows: zone 1: 500°C, zone 2: 600°C, zone 3: 700°C, zone 4: 730°C, zone 5: 760°C, Zone 6: 795°C, Zone 7...

Embodiment 2

[0018] The content of each component of the steel is: C 0.53wt.%, Si 0.22wt.%, Mn 1.01wt.%, S 0.015wt.%, P0.02wt.%, Ni 0.1wt.%, Cr 0.12wt.%, Mo 0.04wt.%, Cu 0.15wt.%, Al 0.015wt.%, the balance is Fe and impurities.

[0019] The normalizing process of the present invention is adopted for processing: (1) the starting rolling temperature before normalizing is 990°C, the finishing rolling temperature is 790°C, and the hot-rolled hardness is 210-245HBW; (2) the roller hearth type continuous heat treatment furnace is adopted, The section is divided into 13 areas with a total length of 65m, among which, the length of areas 1-2 is 6m, the length of areas 3-6 is 4m, the length of area 7 is 7m, the length of area 8 is 4m, and the length of areas 9-10 is 5.5m. The length of zones 11-13 is 5m; the temperature of the roller hearth continuous heat treatment furnace is set as follows: zone 1: 500°C, zone 2: 600°C, zone 3: 700°C, zone 4: 730°C, zone 5: 760°C, Zone 6: 795°C, Zone 7-13: 805°C;...

Embodiment 3

[0022] The content of each component in the steel is: C 0.52wt.%, Si 0.20wt.%, Mn 0.98wt.%, S0.018wt.%, P 0.02wt.%, Ni 0.1wt.%, Cr 0.1wt.%, Mo 0.05wt.%, Cu 0.15wt.%, Al 0.015wt.%, the balance is Fe and impurities.

[0023] The normalizing process of the present invention is adopted for processing: (1) the starting rolling temperature before normalizing is 985°C, the finishing rolling temperature is 790°C, and the hot-rolled hardness is 210-240HBW; The section is divided into 13 areas with a total length of 65m, among which, the length of areas 1-2 is 6m, the length of areas 3-6 is 4m, the length of area 7 is 7m, the length of area 8 is 4m, and the length of areas 9-10 is 5.5m. The length of zones 11-13 is 5m; the temperature of the roller hearth continuous heat treatment furnace is set as follows: zone 1: 500°C, zone 2: 600°C, zone 3: 700°C, zone 4: 730°C, zone 5: 760°C, Zone 6: 795°C, Zone 7-13: 805°C; (3) The steel is spread in batches in the furnace, leaving gaps between d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a normalizing process of steel for automobile transmission shaft parts. The normalizing process comprises the following steps: (1) a roller hearth type continuous heat treatment furnace is adopted, the treatment furnace is divided into 13 zones, and the heating temperature of each zone is set as follows: the first zone is 500 DEG C + / -5 DEG C, the second zone is 600 DEG C + / -5 DEG C, the third zone is 700 DEG C + / -5 DEG C, the fourth zone is 730 DEG C + / -5 DEG C, the fifth zone is 760 DEG C + / -5 DEG C, the sixth zone is 795 DEG C + / -5 DEG C, and the seventh zone to the thirteenth zone is 805 DEG C + / -5 DEG C; (2) heating treatment is carried out on the steel through the zones of 1-7 of the heat treatment furnace, and heat preservation treatment is carried out on the zones of 8-13 of the heat treatment furnace; the transmission speed of a furnace roller is set to be 20 m / h + / -0.1 m / h; in the heating process, the introduction amount of nitrogen in the furnace is set to be 150 m < 3 > / h to 210 m < 3 > / h, and the oxygen content is set to be 5 ppm to 20 ppm; (3) rapid cooling treatment is carried out on the steel; and the frequency of a fan is set to be 888 r / min + / -1 r / min, the instantaneous flow of circulating cooling water is set to be 100 m < 3 >-110 m < 3 >, and the temperature of the circulating cooling water is set to be 15-28 DEG C. The production period can be shortened, and meanwhile it is guaranteed that the steel quality meets the corresponding requirements.

Description

technical field [0001] The invention relates to the technical field of normalizing technology, in particular to a normalizing technology for steel used in automobile transmission shaft parts. Background technique [0002] With the rapid development of science and technology and industrial economy, the high-performance requirements of steel for automotive camshaft parts are becoming increasingly stringent. At present, the unevenness of the hot-rolled material of the commonly used automotive camshaft cannot meet the requirements, and normalizing is required to improve the structure. its even. However, there are problems such as slow furnace roll speed, long production cycle, energy consumption and high production cost in the existing normalizing process. Contents of the invention [0003] Purpose of the invention: In view of the above shortcomings, the present invention provides a normalizing process for steel used in automobile transmission shaft parts, which can reduce th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C21D9/30C21D1/28C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21D8/00
CPCC21D9/30C21D1/28C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21D8/005
Inventor 孙乐政
Owner NANJING IRON & STEEL CO LTD