Standards
- Labeling symbol, coating weight,
surface finish,
chemical treatment, oiling - Mechanical properties
- Dimensional tolerances
Labeling symbol, coating weight, surface finish, chemical treatment, oiling
■Type, symbol, and applicable indicated thickness
The symbols for types and applicable indicated thicknesses are shown in Table 1.
The indicated thickness refers to the thickness of the base steel before plating.
Table 1 : Type symbol and applicable indicated thickness using hot-rolled base steel*
Unit: mm
| Type Symbol | Indicated thickness | Type |
|---|---|---|
| NSTHC | 1.6 to 6.0 | For general use |
| NSTHP1 | Type 1 for drawing | |
| NSTHP2 | Type 2 for drawing | |
| NSTH400 | For structural use | |
| NSTH440 | ||
| NSTH490 | ||
| NSTH540 |
■Plate coating weight
Plating shall be done with equal thickness on both sides, and the symbols used to indicate the coating weight is as shown in Table 2.
Table 2 : Minimum plate coating weight for general products (total of both sides)
Unit: g/m2
| Plate coating weight display symbol |
3-point average minimum coating weight | 1-point minimum coating weight |
|---|---|---|
| T12 | 120 | 102 |
| T20 | 200 | 170 |
| T30 | 300 | 255 |
Note: The maximum amount of coating weight on both sides of the plating may be agreed upon between the receiving parties.
■Surface finish of platingSurface finish of plating
The surface finish of the plating is shown in Table 3.
Table 3 : Types and symbols of the surface finish of the plating
| Type of surface finish of the plating |
Symbol | Description |
|---|---|---|
| Zero spangle | Z | Spangle is pulverized as finely as possible |
■Chemical treatment
Table 4 shows the types and symbols of chemical treatment for plates and coils.
Table 4: Types and symbols of chemical treatment
| Type of chemical treatment | Symbol |
|---|---|
| Chromate-free treatment (general) | QM |
QA treatment = Scheduled for commercialization in October 2022
■Oiling
The types and symbols of oiling for plates and coils are shown in Table 5.
Table 5: Types and symbols for coating oils
| Type of oiling | Symbol |
|---|---|
| No oiling | X |
| General oiling | N |
| Thick oiling | H |
| Thin oiling | L |
Mechanical properties
■Bendability of general products
The bendability of plates and coils is tested according to the bending test conditions shown in Table 6, using a 75-125mm wide test piece with a length that is approximately twice its width. The bendability shall be such that no crack or fracture of 7mm+ (which would be visible with the naked eye) will form on either of the sides along the width of the outer surface of the test piece.
Also, the bending test can be omittedNote1)。However, if the customer specifically requests it, the bending test will always be performed.
Note 1) The test can be omitted at the discretion of the manufacturer, but the bendability must meet the standards.
Table 6: Type symbols and applicable indicated thicknesses
*If you are viewing this document on a smartphone, swipe to the sides to flip the pages.
| Type symbol | Bending angle | Inner spacing (sheets) | |||
|---|---|---|---|---|---|
| Indicated thickness | |||||
| 1.6 mm to < 3.0 mm | 3.0 mm or more | ||||
| Plate coating weight display symbol | |||||
| T12・20 | T30 | T12・20 | T30 | ||
| NSTHC NSTHP1 NSTHP2 |
180̊ | 1 | 2 | 2 | 2 |
| NSTH400 | 2 | 2 | 3 | 3 | |
| NSTH440 NSTH490 NSTH540 |
3 | 3 | 3 | 3 | |
■Plating adhesion
The plating adhesion can be evaluated by a method other than the bending test at the discretion of the manufacturer.
In this case, the evaluation must be equal to or greater than the plating adhesion according to the bending test.
The method of evaluating plating adhesion can be determined between the receiving parties.
■Tensile test characteristics of general products
The yield point, tensile strength, and elongation of plates and coils are shown in Table 7.
Table 7: Yield point, tensile strength and elongation
*If you are viewing this document on a smartphone, swipe to the sides to flip the pages.
| Type Symbol | Yield point or yield strength （N/mm2） |
Tensile strength （N/mm2） |
Yield ratio （％） | Elongation（%） | Test piece and direction |
||||
|---|---|---|---|---|---|---|---|---|---|
| Indicated thickness（mm） | |||||||||
| 1.6 to < 2.0 | 2.0 to < 2.5 | 2.5 to < 3.2 | 3.2 to < 4.0 | 4.0 to < 6.0 | |||||
| NSTHC | - | - | - | - | - | - | - | - | JIS No. 5 rolling direction |
| NSTHP1 | - | 270 or more | - | 34 or more | 35 or more | 35 or more | 36 or more | 36 or more | |
| NSTHP2 | - | 270 or more | - | - | 38 or more | 38 or more | 39 or more | 39 or more | |
| NSTH400 | 295 or more | 400 or more | - | 18 or more | 18 or more | 18 or more | 18 or more | 18 or more | |
| NSTH440 | 335 or more | 440 or more | - | 18 or more | 18 or more | 18 or more | 18 or more | 18 or more | |
| NSTH490 | 365 or more | 490 or more | - | 16 or more | 16 or more | 16 or more | 16 or more | 16 or more | |
| NSTH540 | 400 or more | 540 or more | - | 16 or more | 16 or more | 16 or more | 16 or more | 16 or more | |
Dimensional tolerance
■Product Thickness Tolerance
- Thickness tolerance is applied to the value obtained by adding the equivalent plating thickness in Table 9 for the indicated thickness.
- Thickness tolerance is shown in Table 8-1 and Table 8-2.
- The thickness shall be measured at any point at least 25 mm inside from the side edge.
Table 8-1 Product thickness tolerance (for general use/drawing)
| Indicated thickness | Width（mm） | |||
|---|---|---|---|---|
| < 1,200 | 1,200 to < 1,500 |
1,200 to < 1,524 |
||
| 1.60 to < 2.00 | ±0.17 | ±0.18 | ±0.19 | |
| 2.00 to < 2.50 | ±0.18 | ±0.20 | ±0.22 | |
| 2.50 to < 3.15 | ±0.20 | ±0.22 | ±0.25 | |
| 3.15 to < 4.00 | ±0.22 | ±0.24 | ±0.27 | |
| 4.00 to < 5.00 | ±0.25 | ±0.27 | ±0.29 | |
| 5.00 to < 6.00 | ±0.27 | ±0.29 | - | |
Table 8-2: Product thickness tolerance (for structural applications)
| Type Symbol | Width （mm） |
|---|---|
| 1,524 or less | |
| 1.60 to < 2.00 | ±0.20 |
| 2.00 to < 2.50 | ±0.21 |
| 2.50 to < 3.15 | ±0.23 |
| 3.15 to < 4.00 | ±0.25 |
| 4.00 to < 5.00 | ±0.46 |
| 5.00 to < 6.00 | ±0.51 |
■Width tolerance
Table 9: Width tolerance
Unit: mm
| Mill edge(A) | Cut edge(B) |
|---|---|
| +25 | +10 |
| 0 | 0 |
■Unit mass of plate
Table 10: Unit mass of plate
| Standard thickness(mm) |
Plate coating weight display symbol | ||
|---|---|---|---|
| T12 | T20 | T30 | |
| 1.2 | 9.603 | 9.705 | 9.827 |
| 1.6 | 12.743 | 12.845 | 12.967 |
| 2.0 | 15.883 | 15.985 | 16.107 |
| 2.3 | 18.238 | 18.340 | 18.462 |
| 3.2 | 25.303 | 25.405 | 25.527 |
| 4.5 | 35.508 | 35.610 | 35.732 |
| 6.0 | 47.283 | 47.385 | 47.507 |
Note: Unit mass of stock sheet（kg/m2）= Basic mass of stock sheet x sheet thickness（mm）
Basic mass of stock sheet = 7.85（kg/mm・m2）
Unit mass of plate（kg/m2）= Unit mass of stock sheet（kg/m2）+ coating weight constant
■Coating weight constant
Table 11: Coating weight constant
| Plate coating weight display symbol | T12 | T20 | T30 |
|---|---|---|---|
| Coating weight constant | 0.183 | 0.285 | 0.407 |