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Treatment method of SUS303 steel for automobile starting system

A technology of SUS303 and processing method, applied in the processing field of SUS303 steel, can solve the problem that the tensile strength of SUS303 steel cannot be satisfied, it is difficult for SUS303 steel bars to fully meet its requirements, and it is impossible to ensure that SUS303 steel meets EU RoHS requirements.

Inactive Publication Date: 2021-05-18
苏州金立鑫特材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the acceptance requirements shown in the customer's drawings, it is difficult for the SUS303 steel bars produced by the traditional process to fully meet their requirements
The main difficulties are: the traditional intermediate frequency to AOD smelting process cannot guarantee that SUS303 steel meets EU RoHS requirements; the tensile strength of SUS303 steel after +AT solution heat treatment cannot meet ≥750MPA; under the traditional process production conditions, the dimensional tolerance required by customers cannot be controlled; Ultrasonic inspection may fail; for these defects, it is necessary to design a treatment method for SUS303 steel used in automobile engine systems

Method used

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  • Treatment method of SUS303 steel for automobile starting system
  • Treatment method of SUS303 steel for automobile starting system
  • Treatment method of SUS303 steel for automobile starting system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0042]A method of treatment with SUS303 steel, including step one, smelting; Step 2, electric slag remelting; Step 3, hot rolling forging; step four, steel rod treatment; step five, school straight; step six, cold Pull; step seven, no mobility; step eight, surface cleaning; step nine, surface test; step ten, ultrasonic flaw; step eleven, clean again; step 12, package;

[0043]Among them, in the above steps, smelting includes the following steps:

[0044]1) Artificial selection of suitable SUS303 steel raw materials, and check the surface status of raw materials;

[0045]2) Place SUS303 steel raw material into the smelter, the smelting furnace temperature is 1000-1200 ° C, opening the smelting furnace, extracting its internal air, using Vim smelting SUS303 steel;

[0046]Among the above steps II, the electric slag remelten includes the following steps:

[0047]1) Cooling SUS303 steel after completion in steps 2), and then cleans the surface stains;

[0048]2) Manually put SUS303 steel in a heavy furna...

Embodiment 2

[0067]A method of treatment with SUS303 steel, including step one, smelting; Step 2, electric slag remelting; Step 3, hot rolling forging; step four, steel rod treatment; step five, school straight; step six, cold Pull; step seven, no mobility; step eight, surface cleaning; step nine, surface test; step ten, ultrasonic flaw; step eleven, clean again; step 12, package;

[0068]Among them, in the above steps, smelting includes the following steps:

[0069]1) Artificial selection of suitable SUS303 steel raw materials, and check the surface status of raw materials;

[0070]2) Place SUS303 steel raw material into a smelter, the smelting furnace temperature is 1060 ° C, opening the smelting furnace, extracting its internal air, using Vim smelting SUS303 steel;

[0071]Among the above steps II, the electric slag remelten includes the following steps:

[0072]1) Cooling SUS303 steel after completion in steps 2), and then cleans the surface stains;

[0073]2) Manually put SUS303 steel in a heavy furnace, and...

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Abstract

The invention discloses a treatment method of SUS303 steel for an automobile starting system. The treatment method of the SUS303 steel for the automobile starting system is simple to operate, and comprises the steps of carrying out VIM smelting, gas shielded electroslag remelting smelting, hot rolling and SUS303 steel bar forging; carrying out +AT heat treatment on a SUS303 steel bar at the temperature of 1040-1070 DEG C, and then cooling the bar with water; carrying out straightening; carrying out cold drawing; carrying out centerless grinding; carrying out surface cleaning; carrying out inspection; carrying out ultrasonic flaw detection; carrying out cleaning; and carrying out packaging. After detection, the SUS303 steel completely meets the requirements of customers. According to the SUS303 steel for the automobile starting system, the VIM+ gas shielded electroslag remelting smelting process is adopted, the purity of the material can be remarkably improved, and the problem of residual non-metallic inclusions is greatly reduced; meanwhile, after treatment is conducted through the later-stage oriented heat treatment process, the metallographic structure density of the material can be improved, and the requirements of ultrasonic flaw detection and the European Union RoHS requirements are completely met; and by using a cold drawing process, the tensile strength and straightness of the SUS303 steel can be remarkably improved, later-stage size finishing is facilitated, and the requirements of customers on the surface are met.

Description

Technical field[0001]The present invention relates to the treatment method of SUS303 steel, and is specifically a method for processing SUS303 steel for automobile launching systems.Background technique[0002]As a representative steel SUS303 steel under the US ASME-SA582 standard, it is usually suitable for aviation, aerospace, petroleum exploration, fasteners, military, automobiles, civilians and other fields; SUS303 steel + AT solid solution heat treatment after the yield strength is 220- 350MPa, tensile strength is 420-680 MPa, the extension of the extension is ≥40%, the hardness Hb is 252 or less;[0003]If the acceptance requirements shown in customer drawings, it is difficult to fully meet the requirements according to the SUS303 steel bars produced by traditional processes. The main difficulty is that the smelting process of traditional intermediate frequency to AOD cannot guarantee SUS303 steel in line with EU RoHS requirements; + AT solid solution heat treatment SUS303 steel a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B21C37/04C21D6/00C22B9/18
CPCB21C37/04C21D6/00C22B9/18C22C33/04
Inventor 时文红王晓伟
Owner 苏州金立鑫特材科技有限公司