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

IS 1730 Scope - Key Specifications & Tables

IS 1730 covers standard dimensions, tolerances, and mass of steel sheets, strips, and flats. Key points:

1. Standard Nominal Thickness of Sheets (Clause 5.1)

Typical thickness values (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

2. Standard Nominal Dimensions & Mass of Sheets (Clause 5.2)

• Sizes range from 600 mm to 2500 mm in length and width.
• Mass per sheet varies with thickness and size (kg).
• Mass calculated based on steel density = 7.85 g/cm³.

3. Standard Nominal Thickness of Flats (Clause 7.1)

Thickness (mm):
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. Example:

5. Standard Nominal Dimensions & Mass of Strip (Clause 6.2)

Width (mm) and thickness (mm) with corresponding mass (kg/m). Example:

IS 1730 Key References: Standard Dimensions, Mass & Tolerances

1. Sheet Thickness & Mass (Clause 5.1 & 5.2)

   • Standard nominal thicknesses (mm): 0.40, 0.50, 0.63, 0.80, 1.00, 1.12, 1.25, 1.40, 1.60, 1.80, 2.00, ... up to 4.65.
   • Mass per sheet (kg) varies with size (e.g., 1800x600 mm) and thickness. Refer to Table 5 for exact values.

2. Strip Dimensions & Mass (Clause 6.2)

   • Thicknesses: 1.60 to 10.0 mm.
   • Widths: 100 to 1550 mm.
   • Mass (kg/m) provided for each thickness-width combination (Table 7).

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

   • Nominal thicknesses: 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 40.0, 50.0 mm.
   • Mass (kg/m) varies with width and thickness (Table 9).

4. Density Used

   • Steel density = 7.85 gm/cm³ (7,850 kg/m³).

Example Formula for Mass Calculation:

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

Notes:

• Use tables for precise mass values per standard sizes.
• Tolerances for thickness and dimensions are specified in Clauses 5.1, 6.2, and 7.1.
• For licensing and quality assurance, refer to BIS guidelines.

If needed, I can provide a Mermaid diagram illustrating relationships between thickness, width, and mass. Let me know!

IS 1730: Designation & Dimensions of Steel Plates, Sheets, Strips, and Flats

Designation (Clause 3.1)

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

Dimensions & Mass (Clause 1.1)

• Specifies nominal dimensions, mass, and surface area for hot-rolled steel products.
• Mass can be calculated approximately by:

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

where (\rho = 7850 , kg/m^3) (density of steel).

Quick Reference Table (Typical)

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]

Summary: IS 1730 standardizes designation by product type and dimensions, ensuring

IS 1730: Dimensions and Mass of Plates

1. Mass per Metre of Plates (Clause 4.3, Table 3)

• Mass (kg/m) depends on plate thickness (mm) and width (mm).
• Example values from Table 3:

2. Standard Nominal Sizes (Clause 4.2, Table 2)

• Widths: 900 to 2500 mm.
• Lengths: 2200 to 13500 mm.
• Max thickness for each length-width combination is up to 63 mm (varies by size).

3. Formula for Approximate Mass of Steel Plate

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

• (\rho = 7850 , \text{kg/m}^3) (density of steel)

4. 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

• Use Table 3 for quick mass lookup by thickness & width.
• Use Table 2 for permissible plate sizes and thickness limits.
• Use density formula for custom sizes.
• Hot rolled flats have separate mass tables (Table 9).

flowchart TD
  A[Plate Dimensions] --> B[Width (900 - 2500 mm)]
  A --> C[Length (2200 - 13500 mm)]
  A --> D[Thickness (5 - 63 mm)]
  B & C & D --> E[Calculate Mass using Table 3 or formula]

IS 1730 - Dimensions and Mass of Sheets Summary

1. Nominal Thickness (Clause 5.1, Table 4)

Standard nominal thicknesses (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 Sheet Sizes & Mass (Clause 5.2, Table 5)

• Sheet sizes vary (e.g., 1800×600 mm, 2000×600 mm, etc.)
• Surface area and mass per sheet (kg) are tabulated for each thickness and size.
• Example: For 1800×600 mm sheet, mass ranges from ~3.39 kg (0.40 mm thick) to ~39.4 kg (4.65 mm thick).

3. Nominal Mass Formula (for quick calculation)

[ \text{Mass per sheet (kg)} = \text{Thickness (m)} \times \text{Area (m}^2) \times \rho ] where (\rho) (density) ≈ 7850 kg/m³ for steel.

4. Dimensions and Mass of Strips (Clause 6.2, Table 7)

• Thickness (mm) vs Width (mm) with mass in kg/m.
• Example: For 1.60 mm thick and 100 mm wide strip, mass ≈ 1.25 kg/m.
• Mass increases with thickness and width linearly.

Quick Reference Table Snippet (Sheet 1800×600 mm):

Visual Concept: Mass Calculation Flow

flowchart

IS 1730: Dimensions and Mass of Strips (Clause 6.2)

Key Points:

• Nominal Thicknesses (mm) as per Table 6 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

• Standard Widths (mm) range from 100 to 1550 (typical values: 100, 125, 160, 200, 250, 320, 400, 500, 650, 800, 950, 1000, 1050, 1150, 1250, 1300, 1450, 1550).

• Mass of Strip (kg/m) is given for each thickness-width combination in Table 7.

Mass Calculation Formula:

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

• (\rho = 7.85 , \text{g/cm}^3) (density of steel)
• Thickness and Width in mm, mass in kg per meter length.

Example from Table 7 (partial):

Practical Use:

• Use Table 7 for quick reference of mass per meter for standard strip sizes.
• For non-standard sizes, use the formula above.

flowchart LR
    A[Select Thickness (mm)] --> B[Select Width (mm)]
    B --> C[Refer Table 7 for Mass (kg/m)]
    C --> D[Or Calculate using: Mass = (Thickness × Width × 7.85)/1000]
    D --> E[Use Mass for Design & Procurement]

Summary: IS 173

IS 1730: Dimensions and Mass of Flats

Key Specifications:

• Nominal Thicknesses (mm) (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

• Nominal Widths (mm) and Mass (kg/m) for Flats (Table 9):

Mass (kg/m) = Width (mm) × Thickness (mm) × 7.85 (density of steel in g/cm³) / 1000

Formula for Mass per meter (approximate):

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

Summary:

• Flats are hot-rolled steel with standard thicknesses per Table 8.

IS 1730: Tolerances Key Specifications

1. Standard Nominal Thicknesses

2. Mass per Unit Length for Strips (Clause 6.2, Table 7)

Mass (kg/m) = Thickness (mm) × Width (mm) × Density (7.85 g/cm³) / 1000

3. Mass per Unit Length for Flats (Clause 7.2, Table 9)

Rounding Off of Numerical Values as per IS 1730

• Reference: IS 1730 refers to IS 2:1960 for rounding off rules.
• Key Rule: The final observed or calculated value must be rounded off to the same number of significant places as the specified value in the standard.
• This ensures consistency and compliance when verifying test or analysis results.

Summary of IS 2:1960 Rounding Rules (Applicable here)

Important Notes for IS 1730:

• Mass values are given with 3 significant figures.
• When using tables (e.g., thickness, mass of flats, sheets), round off values accordingly.
• This rule applies to all numerical results in the standard to maintain uniformity.

Example:

If a specified thickness is 3.00 mm (3 significant figures), and the measured value is 2.996 mm, round off to 3.00 mm.

flowchart LR
    A[Measured Value] --> B{Digit to be dropped}
    B -- <5 --> C[Round down]
    B -- >5 --> D[Round up]
    B -- =5 --> E{Following digits}
    E -- non-zero --> D
    E -- zeros --> F{Preceding digit odd?}
    F -- yes --> D
    F -- no --> C

In brief: Follow IS 2:1960 rounding rules, matching the significant figures of the standard's specified values, typically 3 significant figures for mass/thickness in IS 1730.