600 MPa-level thick-specification hot rolling spoke steel and manufacturing method thereof

A technology with thick specifications and spokes, which is applied in the field of iron and steel material engineering, can solve the problems of easy delamination, large springback, rough shape stability punching section, etc., and achieve good shape stability, small springback, and high popularization and application value effect

Inactive Publication Date: 2015-03-04
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a material for automobile wheels, rim steel must have sufficient strength, good formability and weldability. At present, the domestic commercial wheel spoke materials are mainly Q235B, 420CL, 490CL, 540CL and 590CL and other thick carbon and low alloy high strength. Mainly steel, high-strength steel above 500MPa has a large springback due to its high yield strength, the shape stability of the spoke processing and forming, and the rough punching section after the spoke forming is especially prone to delamination defects

Method used

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  • 600 MPa-level thick-specification hot rolling spoke steel and manufacturing method thereof
  • 600 MPa-level thick-specification hot rolling spoke steel and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0029] A 600MPa-grade thick specification steel for hot-rolled spokes, the chemical composition of which is shown in Table 1.

[0030] The invention discloses a method for manufacturing 600MPa-level thick gauge steel for hot-rolled spokes, comprising molten iron pretreatment-converter smelting-LF-continuous casting-hot continuous rolling. The hot continuous rolling process is as follows: slab thickness 135mm, heating temperature 1170°C, holding time 2h, rough rolling start temperature 1120°C, finish rolling temperature 1040°C, 3-pass rolling to 38mm intermediate billet, finish rolling stage The rolling start temperature is 1010°C, the final rolling temperature is 830°C, air-cooled for 3S and then cooled to the target coiling temperature at a cooling rate of 41°C / S, the coiling temperature is 326°C, and the thickness of the finished steel plate is 8mm.

Embodiment 2

[0032] A 600MPa-grade thick specification steel for hot-rolled spokes, the chemical composition of which is shown in Table 1.

[0033] The invention discloses a method for manufacturing 600MPa-level thick gauge steel for hot-rolled spokes, comprising molten iron pretreatment-converter smelting-LF-continuous casting-hot continuous rolling. The hot continuous rolling process is as follows: slab thickness 135mm, heating temperature 1160°C, holding time 2.5h, rough rolling start temperature 1100°C, finish rolling temperature 1000°C, 3-pass rolling to a 38mm intermediate billet, finish rolling The stage start rolling temperature is 1000°C, the final rolling temperature is 820°C, air cooling for 5S and then cooling to the target coiling temperature at a cooling rate of 32°C / S, the coiling temperature is 272°C, and the thickness of the finished steel plate is 10.0mm.

Embodiment 3

[0035] A 600MPa-grade thick specification steel for hot-rolled spokes, the chemical composition of which is shown in Table 1.

[0036] The invention discloses a method for manufacturing 600MPa-level thick gauge steel for hot-rolled spokes, comprising molten iron pretreatment-converter smelting-LF-continuous casting-hot continuous rolling. The hot continuous rolling process is as follows: slab thickness 135mm, heating temperature 1210°C, holding time 1.5h, rough rolling start temperature 1140°C, finish rolling temperature 1050°C, 3-pass rolling to a 38mm intermediate billet, finish rolling Stage start rolling temperature is 1020°C, finish rolling temperature is 810°C, after air cooling for 6S, cool at a cooling rate of 35°C / S to the target coiling temperature, the coiling temperature is 234°C, and the thickness of the finished steel plate is 11.0mm.

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Abstract

The invention provides 600 MPa-level thick-specification hot rolling spoke steel and a manufacturing method thereof. The spoke steel comprises the following chemical constituents in mass percent: 0.06-0.12% of C, 0.20-0.60% of Si, 0.80-1.20% of Mn, 0.02-0.06% of Alt, 0.50-1.00% of Cr, 0.03-0.08% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.006% of N, and the balance of Fe and inevitable impurities. In the manufacturing method of the spoke steel, the billet heating temperature is 1,150-1,250 DEG C, and the finish rolling temperature is 760-840 DEG C; after rolling, a conventional cooling technology is used to cool the steel at a cooling rate of 20-100 DEG C per second to 350 DEG C below, and then the steel is reeled. The steel plate is good in processability and fatigue performance, and free of Nb, V, Mo, Ni and other elements, so as to save the production cost. The steel plate provided by the invention can be widely applied to the spoke production of steel wheels of commercial vehicles.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material engineering, and relates to a steel for spokes and a manufacturing method thereof, in particular to a steel for 600MPa thick gauge hot-rolled spokes and a manufacturing method thereof. Background technique [0002] In 2013, my country's automobile output was 22.11 million, ranking first in the world for five consecutive years. With the increasing energy shortage, the increasing pressure on the environment, and the continuous improvement of global environmental protection legislation, the development of automobile technology has been promoted to focus on energy saving, environmental protection and safety. It has become a consensus to use modern technologies and methods to reduce the weight of components or complete vehicles. On the premise of ensuring safety and other performances, it has become a consensus to achieve the goal of energy saving, emission reduction and consumption red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D8/02
CPCC21D8/0205C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 宋振官刘晓东夏茂森郭占武张磊谭兴华李小权侯续廷
Owner SHANDONG IRON & STEEL CO LTD
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