Surface treatment | - 1. Steel nails may be electroplated. The coating shall be uniform, lustrous and firmly adherent, with no blistering, peeling, black spots or bare areas. The local coating thickness shall be at least 0.003 mm, in accordance with GB/T 5267.1. ;
- 2. Steel nails may be mechanically zinc coated. The coating shall be uniform, smooth and firmly adherent, with no bare areas, black spots or peeling. Zinc thickness shall be at least 0.005 mm and the surface shall comply with JB/T 8928. Dark or light-grey areas of uneven colour are permitted on mechanically zinc-coated surfaces provided the specified minimum zinc thickness is met. ;
- 3. Steel nails may be hot-dip galvanized. The zinc coating shall be uniform, smooth and firmly adherent, with no bare areas, black spots, peeling or zinc spikes. Nails shall not adhere to each other. Zinc thickness shall be at least 0.035 mm, in accordance with GB/T 13912. Dark or light-grey areas of uneven colour are permitted on hot-dip galvanized surfaces provided the specified minimum zinc thickness is met. ;
- 4. Steel nails may be painted. The coating shall provide uniform, firmly adherent coverage, with no bare areas or peeling.
| - 1. Steel nails may be electroplated. The coating shall be uniform, lustrous and firmly adherent, with no blistering, peeling, black spots or bare areas. The local coating thickness shall be at least 0.003 mm, in accordance with GB/T 5267.1. ;
- 2. Steel nails may be mechanically zinc coated. The coating shall be uniform, smooth and firmly adherent, with no bare areas, black spots or peeling. Zinc thickness shall be at least 0.005 mm and the surface shall comply with JB/T 8928. Dark or light-grey areas of uneven colour are permitted on mechanically zinc-coated surfaces provided the specified minimum zinc thickness is met. ;
- 3. Steel nails may be hot-dip galvanized. The zinc coating shall be uniform, smooth and firmly adherent, with no bare areas, black spots, peeling or zinc spikes. Nails shall not adhere to each other. Zinc thickness shall be at least 0.035 mm, in accordance with GB/T 13912. Dark or light-grey areas of uneven colour are permitted on hot-dip galvanized surfaces provided the specified minimum zinc thickness is met. ;
- 4. Steel nails may be painted. The coating shall provide uniform, firmly adherent coverage, with no bare areas or peeling.
| - 1. Steel nails may be electroplated. The coating shall be uniform, lustrous and firmly adherent, with no blistering, peeling, black spots or bare areas. The local coating thickness shall be at least 0.003 mm, in accordance with GB/T 5267.1. ;
- 2. Steel nails may be mechanically zinc coated. The coating shall be uniform, smooth and firmly adherent, with no bare areas, black spots or peeling. Zinc thickness shall be at least 0.005 mm and the surface shall comply with JB/T 8928. Dark or light-grey areas of uneven colour are permitted on mechanically zinc-coated surfaces provided the specified minimum zinc thickness is met. ;
- 3. Steel nails may be hot-dip galvanized. The zinc coating shall be uniform, smooth and firmly adherent, with no bare areas, black spots, peeling or zinc spikes. Nails shall not adhere to each other. Zinc thickness shall be at least 0.035 mm, in accordance with GB/T 13912. Dark or light-grey areas of uneven colour are permitted on hot-dip galvanized surfaces provided the specified minimum zinc thickness is met. ;
- 4. Steel nails may be painted. The coating shall provide uniform, firmly adherent coverage, with no bare areas or peeling.
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Mechanical properties | Hardness | - For steel nails heat-treated to increase hardness, nails with shank diameters above 2.2 mm shall be at least 49 HRC. Nails with shank diameters of 2.2 mm or less shall be at least 45 HRC. ;
- There is no hardness requirement for steel nails that have not been heat-treated.
| - For steel nails heat-treated to increase hardness, nails with shank diameters above 2.2 mm shall be at least 49 HRC. Nails with shank diameters of 2.2 mm or less shall be at least 45 HRC. ;
- There is no hardness requirement for steel nails that have not been heat-treated.
| - For steel nails heat-treated to increase hardness, nails with shank diameters above 2.2 mm shall be at least 49 HRC. Nails with shank diameters of 2.2 mm or less shall be at least 45 HRC. ;
- There is no hardness requirement for steel nails that have not been heat-treated.
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