本标准规定了涂装前钢材表面锈蚀程度和除锈质量的目视评定等级。它适用于以喷射或抛射除锈、手工和动力工具除锈以及火焰除锈方式处理过的热轧钢材表面。冷轧钢材表面除锈等级的评定也可参照使用。
本标准等效采用国际标准ISO 8501-1：1988《涂装油漆和有关产品前钢材预处理——表面清洁度的目视评定——第一部分：未涂装过的钢材和全面清除原有涂层后的钢材的锈蚀等级和除锈等级》。
1 总则
1.1 本标准将未涂装过的钢材表面原始锈蚀程度分为四个“锈蚀等级”，将未涂装过的钢材表面及全面清除过原有涂层的钢材表面除锈后的质量分为若干个“除锈等级”。钢材表面的锈蚀等级和除锈等级均以文字叙述和典型样板的照片共同确定。
1.2 本标准以钢材表面的目视外观来表达锈蚀等级和除锈等级。评定这些等级时，应在适度照明条件下，不借助于放大镜等器具，以正常视力直接进行观察。
2 锈蚀等级
钢材表面的四个锈蚀等级分别以A、B、C和D表示。这些锈蚀等级的典型样板照片见第5章，其文字叙述如下：
A 全面地复盖着氧化皮而几乎没有铁锈的钢材表面；
B 已发生锈蚀，并且部分氧化皮已经剥落的钢材表面；
C 氧化皮已因锈蚀而剥落，或者可以刮除，并且有少量点蚀的钢材表面；
D 氧化皮已因锈蚀而全面剥离，并且已普遍发生点蚀的钢材表面。
3 除锈等级
3.1 通则
3.1.1 钢材表面除锈等级以代表所采用的除锈方法的字母“Sa”、“St”或“F1”表示。如果字母后面有阿拉伯数字，则其表示清除氧化皮、铁锈和油漆涂层等附着物的程度等级。
3.1.2 钢材表面除锈等级的文字叙述见3.2、3.3和3.4条，这些等级的典型样板照片见第5章。
注：（1）本章各除锈等级定义中，“附着物”这个术语可包括焊渣、焊接飞溅物，可溶性盐类等。
（2）本章中，当氧化皮、铁锈或油漆涂层能以金属腻子刮刀从钢材表面剥离时，均应看成附着不牢。
This standard specifies visual means for detecting rust grades and preparation grade of steel surface before painting. It is applicable to hot-strip surface that has been de-rusting through blast rust cleaning, manual and power tool cleaning and flame cleaning. The standard may also service as reference for rust grades assessment of cold rolled steels.
This standard is equivalent to International Standard ISO 8501-1: 1988 "Steel Pretreatment before Application of Painting and Relevant Product -- Visual Assessment of Surface Clearness -- Part 1: Rust Grade of Un-Cleaned Steel And Preparation Grade of Steel That Has Been Completely Cleaned".
1. General provision
1.1 According to this standard the rust grades of unpainted original steel surface shall be divided into for “rust grades”, and preparation grades of the unpainted cleaned steel surface shall be divided into several "preparation grades". Rust grade and preparation grade of steel surface can be accessed through literal descriptions and type typical photo model.
1.2 This standard expresses the assessment of rust grade and preparation grade of steel surface on a visual base. These grades shall be directly assessed by normal sight with moderate lighting, but without magnifier and other implements.
2. Rust Grades
The four rust grades of steel surface are respectively represented by A, B, C, and D. The typical photo model of these rust grades can be seen in chapter 5 and their literal description are as follows:
A. Steel surfaces covered overall with the oxide coating, and hardly any rust.
B. Steel surfaces with rust, and the oxide coating has already partially exfoliated.
C Steel surfaces with the oxide coating exfoliated and could be scraped off, and with rust spot.
D Steel surfaces with the oxide coating completely dropped, and with rust spot widespread.
3. Preparation Grades
3.1 General Principles
3.1.1 The preparation grade of steel surface can be represented by letters "Sa ", “St" or "f1", which indicate the de-rusting methods adopted. The numbers after letters indicate cleaning grades of oxide coating, rust and paint coating.
3.1.2 Literal descriptions of the preparation grade of steel surface can be seen in 3.2, 3.3 and 3.4, and the corresponding typical photo model can be seen in chapter 5.
Notes: 1) Attachments mentioned above include welding slag, weld spatter, soluble salt and others.
2) In this chapter oxide coating, rust and paint coating that can be detached from steel surface by metal tweezers and drawknife shall be regarded as un-firm attachments.
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