① 生產商和采購商達成協議后，可提供大于0.008%。
② Cu+Ni+Cr+Mo≤0.50，Cr+Mo≤0.16：

注：For grade CH550. the yield strength approaches the tensile strength and, since there is no hesitation in the pointer or drop of the beam, the lower yield strength shall be taken as the strength at 0,5 % total elongation under load in accordance with ISO 6892-1.