起重用短环链 吊链等用M(4)级非校准链条

[中文适用范围]： 本文件规定了 4 级不锈钢中公差吊带链的要求，优选用于 4 级不锈钢链吊带或用于其他起重用途。 本文件涵盖的公称直径 dn 范围为 4 毫米至 22 毫米。 这些吊链是圆钢短环链，标称节距为 pn = 3 × dn，经过电焊接、固溶退火和测试。 它们的使用温度范围为 –100 °C 至 +400 °C。 它们符合 ISO 1834 的一般验收条件。 注 1：由于吊链在成品状态下经过固溶退火，因此根据 5.2 的规定，它们的使用不受钢材耐腐蚀性的限制。 更高等级的不锈钢链条是通过在链条制造之前对钢丝进行冷拔来实现的。 因此，在不降低强度的情况下固溶退火是不可能的。 尤其是焊缝，是耐腐蚀性的关键区域。 注 2：ISO 4063 中列出了电阻对焊和闪光焊。 [外文原描述]： This document specifies the requirements for medium tolerance sling chains of grade 4 from stainless steel for use preferably in chain slings of grade 4 from stainless steel or for other lifting purposes. The range of nominal diameter, dn, covered by this document is from 4 mm to 22 mm. These sling chains are round steel short link chains with a nominal pitch, pn = 3 × dn, electrically welded, solution-annealed and tested. They are for use in the temperature range ?100 °C to +400 °C. They comply with the general conditions of acceptance of ISO 1834. NOTE 1 Because sling chains are solution-annealed in the finished condition, they can be used without restrictions with regard to the corrosion resistance of the steels according to 5.2. Higher grades of stainless steel chains are achieved by cold drawing of the wire prior to the chain manufacturing. Therefore, solution annealing is not possible without reduction of strength. The weld seam, in particular, represents a critical area with regard to the corrosion resistance. NOTE 2 Resistance butt welding and flash welding are listed in ISO 4063.