This standard specifies the requirements for stress relief of high-strength steels in order to reduce the sensitivity or degree of sensitivity to hydrogen embrittlement during subsequent pretreatment, electroplating, chemical plating, chemical conversion and phosphating. This standard applies to steels that are heat treated at temperatures of 190°C to 230°C or higher without causing a reduction in their properties. The heat treatment process specified in this standard is effective in reducing the hydrogen embrittlement sensitivity of steels with a tensile strength equal to or greater than 1 000 MPa and that are machined, ground, cold formed or cold straightened after heat treatment. This heat treatment process is used before any process in which hydrogen permeation of parts may occur, just as a cleaning process is used before electroplating, chemical plating and other chemical coating operations. This standard does not apply to fasteners. GB/T 19349-2003 Metallic and other inorganic coatings Pretreatment of steel to reduce the risk of hydrogen embrittlement GB/T19349-2003 standard download decompression password: www.bzxz.net
This standard specifies the requirements for relieving stresses in high-strength steels in order to reduce the sensitivity or degree of sensitivity to hydrogen embrittlement during subsequent pretreatment, electroplating, chemical plating, chemical conversion and phosphating. This standard applies to steels that are heat treated at temperatures of 190℃ to 230℃ or higher without causing a decrease in their properties. The heat treatment process specified in this standard is effective in reducing the hydrogen embrittlement sensitivity of steels with a tensile strength equal to or greater than 1 000MPa and that are mechanically processed, ground, cold formed or cold straightened after heat treatment. This heat treatment process is used before any process in which hydrogen permeation of parts may occur, just as a cleaning process is used before electroplating, chemical plating and other chemical coating operations. This standard does not apply to fasteners.

GH/T19349—2003/JSO 9587:1999 This standard adopts 159587:1999 for the treatment of steel with gold mesh and other inorganic coverings to reduce the risk of hydrogen embrittlement. The English standard is revised based on 1S0S587:1399. This standard has made the following revisions to 1509587: The preceding notice of the international standard has been cancelled! www.bzxz.net
In order to facilitate application, the Chinese standard adopting the international standard is adopted; "normative reference document" is added; "this standard is difficult\standard format\international standard is difficult", and the China Machinery Industry Federation proposes that: this standard is jointly established by the national and non-metallic chemical technology departments, and the drafting unit of this standard is: Wuhan Institute of Material Standardization. The main contributors of this standard are Huang Rong, Yu Jingdai, Zhang Sanping, Xu Yanqi, GB/T19349--2003/1509587:1999 Introduction
When Guangbao enters some other alloys such as aluminum and steel, it can cause its single load or single load to cause damage to its properties or cracking (usually microscopic cracking effect), or when the external addition is much lower than the alloy's service strength Even low-strength alloys are usually designed to withstand catastrophic conditions. This phenomenon often occurs when the alloy loses its toughness and is particularly evident when using a tensile test. This phenomenon of the alloy is usually caused by hydrogen-induced bulging, oxygen-induced rupture or hydrogen embrittlement. In the lubrication, cleaning, sizing, degradation, electrochemical, catalytic processes and material reconstruction processes, the quality of the material should be guaranteed. In the processing of the coating - such as rolling, machining and drilling, improper selection of lubrication may cause decomposition of the metal or excessive bonding, which may also cause hydrogen embrittlement. Strengthening heat treatment, mechanical treatment before or after cooling or direct cooling can also prevent hydrogen embrittlement. Heat treatment can reduce the absorption of oxygen and or ) The hydrogen embrittlement caused by the small tensile stress produced during the reworking process. The heat treatment time is closely related to the composition, structure and coating type. For most high-strength steels, the heat treatment effect decreases sharply with the decrease of treatment time and humidity. This standard proposes technical requirements for the required time, supply or addition. These requirements should be indicated on the parts or purchase order.
tScope
GB/T79349-20C3/1S09587,1999 Metals and other inorganic pretreatments
To reduce the risk of hydrogen embrittlement
This standard specifies the requirements for the pretreatment of steel to reduce the risk of hydrogen embrittlement, so as to reduce the subsequent processing, electrical relays, etc. This standard is applicable to steels that have been heat treated at temperatures between 1°C and 230°C or higher without causing degradation of the sheet (see 5.3). The treatment procedures specified in this standard are effective in reducing the tensile strength of steels that have been machined, cold formed, or cold straightened after heat treatment. The heat treatment procedures may be used before any chemical treatment operation, such as washing, chemical bonding, and other chemical operations. This standard supplements the use of "purple to" parts
2 Normative references
The following documents and clauses also become clauses of this standard through reference in this standard. For any document with a date, all subsequent receipts (without error in brackets) or revisions are not applicable to this standard. However, the parties to this agreement shall study whether the latest versions of these documents can be used. For any document without a date, the latest version shall be applicable. (B/T3_38) This standard adopts TS02079:1981 and 502(60,-981)1S01365 inorganic coating as a pre-treatment of metal mesh parts to be processed, chemically cast or buried or as the final treatment of metal mesh parts
3 Terms and definitions
This standard adopts (/T31 and the following terms and definitions: 3.1 Stress relief heat treatment || tt||Under a certain temperature range and fixed treatment, the metal structure of the body is not changed (such as the surface of the mirror part should be treated to eliminate the potential of the mirror part.
4 Requirements
The body metal is heat treated according to the requirements of Table 1 to reduce the risk of the test. Under any circumstances, the heat treatment course should not start until the specified temperature is reached.
The actual component parts and surface inversion parts with corresponding hardness values ​​of K10MPa, HHV10.S03HB or 31IIRC) should be treated according to some requirements. The stress relief heat treatment must be determined as SR-7, and the pretreatment of the embedded parts in the presence of stress relief or acid wave should be avoided. Table 1 lists the stress relief heat treatment levels, which can be used to determine the required stress. Table 1] In the parts drawing, the purchase order, the electroplating party, the supplier or the processing party stipulates that if the stress relief level is not specified, the level -1 should be used. Note! The requirements of the production should be reported to the parts to increase the price of the parts and the system. The parts should be reported to the shareholders or the inspection results. Because the alloy composition, structure, quality, etc. are the same, some parts can also be eliminated without treatment. The total thinking is not enough. Therefore, for the parts that need to be excellent and not hot, it is necessary to use the parts that are not heat-resistant. 2: It is not possible to guarantee the minimum limit of 1
GB/1:19349-200S/1809587:1999 Jiang 3, the source party does not specify the treatment time, etc., and the R·1 development is a kind of deficiency, the electrical sensitive party, the supplier or the increase 1. The square does not report the correct stress The necessary information of the treatment should be provided by the design and manufacturing process. The design and manufacturing method of the parts should also be provided by the parts designer! Other technical personnel of the parts should be instructed by the supplier or the purchase order, so as to avoid the unreasonable treatment and the cost of the parts not meeting the requirements of the purchaser.
5 Classification of steel
In addition to the surface hardened parts, the heat treatment process should be selected with the actual tensile strength. If the minimum tensile strength is specified, or the tensile strength is known, the heat treatment process should be selected according to the actual tensile strength calculated from the relevant hardness value that has been marked or measured. The tensile strength or the corresponding tensile strength value calculated from the known measured section should be provided by the purchaser. For the parts that have been completely or partially hardened, they should be classified accordingly according to the hardness of the surface cured layer. Stress relief
6.1 High-strength steel should be treated according to the following provisions. For steel parts with an actual tensile strength less than 200 MPa, stress relief treatment is not necessary; for steel parts with an actual tensile strength greater than or equal to 1000 MPa, stress relief treatment shall be performed using one of the processes listed in Table 1. Stress relief treatment shall be performed before any pretreatment, cleaning or other treatment of the product. 62 If the appropriate temperature is not adversely affected by the stress relief process, this process may be used. Tempering of steel parts should be performed at a temperature less than 0.63 If ​​the stress relief process is performed after shot peening at 120 °C or after any other stress relief treatment, the temperature of the treatment shall not exceed 230 °C. .4 Parts made by rapid annealing with a temperature lower than 40F/min, if they already have a specific surface hardened area, the hardness of the surface hardened area will be reduced when heat treated at a higher temperature, but not less than 10, and the shortening of the treatment time is 8E. Low temperature heat treatment can have an adverse effect on the fatigue strength of the part. Table! High strength steel stress relief requirements (see 4, 5 and 6 for details) Steel stress resistance R./M22
: 401E.: 800
3 4CR..: 800
:000mR.:400
1 15cR.1 45c
*Surface physics and chemistry, cultivation of mind
Some areas of the East standard deduction of traditional treatment of the company/
Not the surface of the light bottom of the small heat of some principles
2on-230
13c--220
99C--230
15C--235
179--205
20C-230
196--220
13c --1e3
Shortest reading
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