GB/T 19349-2003 in English

《GB/T 19349-2003金属和其他无机覆盖层 为减少氢脆危险的钢铁预处理》由TC57（全国金属与非金属覆盖层标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了消除高强度钢应力的要求，以便降低随后进行的预处理、电镀、化学镀、化学转化及磷化过程中的氢脆敏感性或敏感性程度。本标准适用于在190℃～230℃或更高的温度下对其热处理而不导致其性能降低的钢。本标准规定的热处理工序对减少抗拉强度等于或高于1 000MPa并在热处理后经机械加工、磨削、冷成型或冷矫直处理的钢的氢脆敏感性是有效的。该热处理工序用在可能出现零件渗氢的任一工序之前，就如同清洗工序用于电镀、化学镀和其他化学覆盖层操作之前一样。本标准不适用于紧固件。

Scope

This standard specifies requirements for stress relief of high-strength steels in order to reduce the susceptibility or degree of susceptibility to hydrogen embrittlement during subsequent pretreatment, electroplating, electroless plating, chemical conversion and phosphating. This standard applies to steels that are heat-treated at temperatures between 190°C and 230°C or higher without degrading their properties (see 6.2). The heat treatment procedures specified in this standard are effective for reducing the susceptibility to hydrogen embrittlement of steels with a tensile strength equal to or higher than 1 000 Mpa that have been machined, ground, cold formed or cold straightened after heat treatment. This heat treatment process is used before any process where hydrogen bleed into the part may occur, just as cleaning processes are used before electroplating, electroless plating, and other chemical coating operations. This standard does not apply to fasteners.