Dimensions for steel plates, sheets strips and flats for general engineering purposes
1989 Edition

IS 1730 defines the standard dimensions, permissible tolerances, and mass values for hot-rolled steel sheets, strips, and flats. Important highlights include:

1. Nominal Thickness of Sheets (Clause 5.1)

Standard thicknesses (in mm) include: 0.40, 0.50, 0.63, 0.80, 1.00, 1.12, 1.25, 1.40, 1.60, 1.80, 2.00, 2.24, 2.50, 2.80, 3.15, 3.55, 4.00, 4.30, 4.65

2. Standard Dimensions and Weight of Sheets (Clause 5.2)

• Sheet sizes typically range between 600 mm and 2500 mm for length and width.
• Mass per sheet depends on thickness and dimensions (kg).
• Mass is computed using steel density of 7.85 g/cm³.

3. Nominal Thickness of Flats (Clause 7.1)

Thicknesses (mm) include: 3.0, 4.0, 5.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 40.0, 50.0

4. Mass of Hot Rolled Steel Flats (Clause 7.2)

Mass (kg/m) depends on width and thickness, for example:

5. Standard Strip Dimensions and Mass (Clause 6.2)

Widths and thicknesses have corresponding mass values (kg/m), e.g.:

Core references within IS 1730 include:

1. Sheet Thickness and Mass (Clauses 5.1 & 5.2)

   • Standard nominal thickness values from 0.40 mm to 4.65 mm.
   • Mass per sheet varies based on dimensions, detailed in Table 5.

2. Strip Dimensions and Mass (Clause 6.2)

   • Thickness ranges from 1.60 mm to 10.0 mm.
   • Widths span 100 mm to 1550 mm.
   • Mass values for each thickness-width pair are tabulated in Table 7.

3. Flats Thickness and Mass (Clauses 7.1 & 7.2)

   • Thicknesses from 3.0 mm to 50.0 mm.
   • Mass (kg/m) varies with width and thickness, available in Table 9.

4. Steel Density Utilized

   • Adopted density is 7.85 g/cm³ (7850 kg/m³).

Mass Calculation Formula:

[ \text{Mass (kg)} = 7.85 \times 10^{-3} \times \text{Thickness (mm)} \times \text{Width (mm)} \times \text{Length (m)} ]

Notes:

• Use the tables for precise mass values for standardized sizes.
• Thickness and size tolerances are detailed in Clauses 5.1, 6.2, and 7.1.
• For licensing, inspection, and quality assurance, consult BIS guidelines.

IS 1730 defines a clear designation scheme for hot-rolled steel items:

Product Codes (Clause 3.1)

• Plates: Format ISPL Length(mm) x Width(mm) x Thickness(mm) Example: ISPL 3000 x 1500 x 10
• Sheets: Format ISSH Length(mm) x Width(mm) x Thickness(mm) Example: ISSH 2000 x 1000 x 5
• Strips: Format ISST Width(mm) x Thickness(mm) Example: ISST 100 x 3
• Flats: Format Width(mm) ISF Thickness(mm) Example: 50 ISF 6

Dimensions and Mass Details (Clause 1.1)

• Specifies nominal dimensions, mass, and surface areas for hot-rolled steel products.
• Mass approximation: [ \text{Mass (kg)} = \text{Length (m)} \times \text{Width (m)} \times \text{Thickness (m)} \times 7850 ]

Typical Dimensions Table

flowchart TD
    A[Steel Products] --> B[Plates (ISPL)]
    A --> C[Sheets (ISSH)]
    A --> D[Strips (ISST)]
    A --> E[Flats (ISF)]
    B --> F[Length x Width x Thickness]
    C --> G[Length x Width x Thickness]
    D --> H[Width x Thickness]
    E --> I[Width + ISF + Thickness]

Mass per Meter of Plates (Clause 4.3, Table 3)

• Plate mass in kg/m depends on thickness and width.
• Sample data: | Thickness (mm) | Width 1000 mm | Width 1500 mm | Width 2000 mm | |----------------|---------------|---------------|---------------| | 5 | 39.2 | 58.9 | 78.5 | | 10 | 78.5 | 118 | 157 | | 20 | 157 | 236 | 314 | | 50 | 392 | 589 | 785 |

Standard Sizes (Clause 4.2, Table 2)

• Widths from 900 mm to 2500 mm.
• Lengths from 2200 mm to 13500 mm.
• Maximum thickness up to 63 mm depending on length and width.

Mass Calculation Formula

[ \text{Mass (kg)} = \text{Length (m)} \times \text{Width (m)} \times \text{Thickness (m)} \times 7850 ]

Hot Rolled Flats (Clause 7.2, Table 9)

• Mass per meter varies with width and thickness.
• Example: For 50 mm width and 10 mm thickness, mass = 3.93 kg/m.

Summary

• Refer to Table 3 for quick mass values by thickness and width.
• Table 2 lists permissible plate sizes and thickness limits.
• Use the density-based formula for non-standard sizes.
• Separate mass tables exist for hot rolled flats.

Nominal Thickness (Clause 5.1, Table 4)

Standard thicknesses in mm: 0.40, 0.50, 0.63, 0.80, 1.00, 1.12, 1.25, 1.40, 1.60, 1.80, 2.00, 2.24, 2.50, 2.80, 3.15, 3.55, 4.00, 4.30, 4.65

Sheet Sizes and Mass (Clause 5.2, Table 5)

• Sheet dimensions vary, examples include 1800x600 mm, 2000x600 mm.
• Surface area and mass per sheet (kg) are tabulated by thickness and size.
• Example: A 1800x600 mm sheet weighs about 3.39 kg at 0.40 mm thickness and up to 39.4 kg at 4.65 mm thickness.

Mass Calculation

[ \text{Mass per Sheet (kg)} = \text{Thickness (m)} \times \text{Area (m}^2) \times 7850 ]

Strips Dimensions and Mass (Clause 6.2, Table 7)

• Thickness and width combinations with corresponding mass in kg/m.
• For example, a 1.60 mm thick, 100 mm wide strip weighs approximately 1.25 kg/m.

Sample Mass Table for 1800x600 mm Sheet

Standard Thicknesses (Clause 6.2, Table 6)

Thickness values include: 1.60, 1.80, 2.00, 2.24, 2.50, 2.80, 3.15, 3.55, 4.00, 4.50, 5.00, 6.00, 8.00, 10.00 mm

Standard Widths

Range from 100 mm up to 1550 mm, including typical widths such as 100, 125, 160, 200, 250, 320, 400, 500, etc.

Mass per Meter (Clause 6.2, Table 7)

• Mass values (kg/m) are provided for each thickness and width combination.

Mass Calculation Formula

[ \text{Mass (kg/m)} = \frac{\text{Thickness (mm)} \times \text{Width (mm)} \times 7.85}{1000} ]

Example Values

Practical Guidance

• Reference Table 7 for standard sizes.
• For non-standard dimensions, use the formula to calculate mass.

flowchart LR
    A[Choose Thickness] --> B[Choose Width]
    B --> C[Look Up Mass in Table 7]
    C --> D[Or Compute Using Formula]
    D --> E[Apply Mass for Engineering Purposes]

Nominal Thicknesses (Table 8)

Common thicknesses: 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 15.0, 20.0, 25.0, 30.0, 40.0, 50.0 mm

Widths and Mass per Meter (Table 9)

Mass per Meter Formula

[ \text{Mass (kg/m)} = \frac{\text{Width (mm)} \times \text{Thickness (mm)} \times 7.85}{1000} ]

Summary

Flats are hot-rolled steel products with standardized thicknesses and widths. Mass values per unit length are calculated using the formula above or referenced from tables.

Tolerances Overview

IS 1730 defines tolerances for thickness and dimensions as follows:

Mass per Unit Length

• For strips (Clause 6.2, Table 7): ( \text{Mass (kg/m)} = \frac{\text{Thickness} \times \text{Width} \times 7.85}{1000} )

Example mass values:

• For flats (Clause 7.2, Table 9): | Width (mm) | Thickness (mm) | Mass (kg/m) | |------------|----------------|-------------| | 20 | 5 | 0.785 | | 40 | 10 | 3.14 |

Summary

Tolerances ensure dimensional accuracy for plates, strips, and flats, aligned with IS 1852 standards.

Rounding Rules as per IS 1730 and IS 2:1960

• IS 1730 adopts rounding procedures from IS 2:1960.
• Numerical values must be rounded to the number of significant digits specified in the standard.

IS 2:1960 Rounding Principles

Important Notes

• Mass and thickness values in IS 1730 are typically rounded to 3 significant figures.
• This ensures consistency in reporting and verifying measurements.

Example

A measured thickness of 2.996 mm for a specified 3.00 mm thickness should be rounded to 3.00 mm.

flowchart LR
    A[Measured Value] --> B{Digit to Drop}
    B -- <5 --> C[Round Down]
    B -- >5 --> D[Round Up]
    B -- =5 --> E{Following Digits}
    E -- Non-zero --> D
    E -- Zeros --> F{Is Preceding Digit Odd?}
    F -- Yes --> D
    F -- No --> C